1 | /* stbi-1.29 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c |
2 | when you control the images you're loading |
3 | no warranty implied; use at your own risk |
4 | |
5 | QUICK NOTES: |
6 | Primarily of interest to game developers and other people who can |
7 | avoid problematic images and only need the trivial interface |
8 | |
9 | JPEG baseline (no JPEG progressive) |
10 | PNG 8-bit only |
11 | |
12 | TGA (not sure what subset, if a subset) |
13 | BMP non-1bpp, non-RLE |
14 | PSD (composited view only, no extra channels) |
15 | |
16 | GIF (*comp always reports as 4-channel) |
17 | HDR (radiance rgbE format) |
18 | PIC (Softimage PIC) |
19 | |
20 | - decoded from memory or through stdio FILE (define STBI_NO_STDIO to remove code) |
21 | - supports installable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD) |
22 | |
23 | Latest revisions: |
24 | 1.29 (2010-08-16) various warning fixes from Aurelien Pocheville |
25 | 1.28 (2010-08-01) fix bug in GIF palette transparency (SpartanJ) |
26 | 1.27 (2010-08-01) cast-to-uint8 to fix warnings (Laurent Gomila) |
27 | allow trailing 0s at end of image data (Laurent Gomila) |
28 | 1.26 (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ |
29 | 1.25 (2010-07-17) refix trans_data warning (Won Chun) |
30 | 1.24 (2010-07-12) perf improvements reading from files |
31 | minor perf improvements for jpeg |
32 | deprecated type-specific functions in hope of feedback |
33 | attempt to fix trans_data warning (Won Chun) |
34 | 1.23 fixed bug in iPhone support |
35 | 1.22 (2010-07-10) removed image *writing* support to stb_image_write.h |
36 | stbi_info support from Jetro Lauha |
37 | GIF support from Jean-Marc Lienher |
38 | iPhone PNG-extensions from James Brown |
39 | warning-fixes from Nicolas Schulz and Janez Zemva |
40 | 1.21 fix use of 'uint8' in header (reported by jon blow) |
41 | 1.20 added support for Softimage PIC, by Tom Seddon |
42 | |
43 | See end of file for full revision history. |
44 | |
45 | TODO: |
46 | stbi_info support for BMP,PSD,HDR,PIC |
47 | rewrite stbi_info and load_file variations to share file handling code |
48 | (current system allows individual functions to be called directly, |
49 | since each does all the work, but I doubt anyone uses this in practice) |
50 | |
51 | |
52 | ============================ Contributors ========================= |
53 | |
54 | Image formats Optimizations & bugfixes |
55 | Sean Barrett (jpeg, png, bmp) Fabian "ryg" Giesen |
56 | Nicolas Schulz (hdr, psd) |
57 | Jonathan Dummer (tga) Bug fixes & warning fixes |
58 | Jean-Marc Lienher (gif) Marc LeBlanc |
59 | Tom Seddon (pic) Christpher Lloyd |
60 | Thatcher Ulrich (psd) Dave Moore |
61 | Won Chun |
62 | the Horde3D community |
63 | Extensions, features Janez Zemva |
64 | Jetro Lauha (stbi_info) Jonathan Blow |
65 | James "moose2000" Brown (iPhone PNG) Laurent Gomila |
66 | Aruelien Pocheville |
67 | |
68 | If your name should be here but isn't, let Sean know. |
69 | |
70 | */ |
71 | |
72 | #ifdef _KERNEL |
73 | #include <dev/stbi/stbiconfig.h> |
74 | #endif |
75 | |
76 | #ifndef STBI_INCLUDE_STB_IMAGE_H |
77 | #define STBI_INCLUDE_STB_IMAGE_H |
78 | |
79 | // To get a header file for this, either cut and paste the header, |
80 | // or create stb_image.h, #define STBI_HEADER_FILE_ONLY, and |
81 | // then include stb_image.c from it. |
82 | |
83 | //// begin header file //////////////////////////////////////////////////// |
84 | // |
85 | // Limitations: |
86 | // - no jpeg progressive support |
87 | // - non-HDR formats support 8-bit samples only (jpeg, png) |
88 | // - no delayed line count (jpeg) -- IJG doesn't support either |
89 | // - no 1-bit BMP |
90 | // - GIF always returns *comp=4 |
91 | // |
92 | // Basic usage (see HDR discussion below): |
93 | // int x,y,n; |
94 | // unsigned char *data = stbi_load(filename, &x, &y, &n, 0); |
95 | // // ... process data if not NULL ... |
96 | // // ... x = width, y = height, n = # 8-bit components per pixel ... |
97 | // // ... replace '0' with '1'..'4' to force that many components per pixel |
98 | // stbi_image_free(data) |
99 | // |
100 | // Standard parameters: |
101 | // int *x -- outputs image width in pixels |
102 | // int *y -- outputs image height in pixels |
103 | // int *comp -- outputs # of image components in image file |
104 | // int req_comp -- if non-zero, # of image components requested in result |
105 | // |
106 | // The return value from an image loader is an 'unsigned char *' which points |
107 | // to the pixel data. The pixel data consists of *y scanlines of *x pixels, |
108 | // with each pixel consisting of N interleaved 8-bit components; the first |
109 | // pixel pointed to is top-left-most in the image. There is no padding between |
110 | // image scanlines or between pixels, regardless of format. The number of |
111 | // components N is 'req_comp' if req_comp is non-zero, or *comp otherwise. |
112 | // If req_comp is non-zero, *comp has the number of components that _would_ |
113 | // have been output otherwise. E.g. if you set req_comp to 4, you will always |
114 | // get RGBA output, but you can check *comp to easily see if it's opaque. |
115 | // |
116 | // An output image with N components has the following components interleaved |
117 | // in this order in each pixel: |
118 | // |
119 | // N=#comp components |
120 | // 1 grey |
121 | // 2 grey, alpha |
122 | // 3 red, green, blue |
123 | // 4 red, green, blue, alpha |
124 | // |
125 | // If image loading fails for any reason, the return value will be NULL, |
126 | // and *x, *y, *comp will be unchanged. The function stbi_failure_reason() |
127 | // can be queried for an extremely brief, end-user unfriendly explanation |
128 | // of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid |
129 | // compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly |
130 | // more user-friendly ones. |
131 | // |
132 | // Paletted PNG, BMP, GIF, and PIC images are automatically depalettized. |
133 | // |
134 | // =========================================================================== |
135 | // |
136 | // iPhone PNG support: |
137 | // |
138 | // By default we convert iphone-formatted PNGs back to RGB; nominally they |
139 | // would silently load as BGR, except the existing code should have just |
140 | // failed on such iPhone PNGs. But you can disable this conversion by |
141 | // by calling stbi_convert_iphone_png_to_rgb(0), in which case |
142 | // you will always just get the native iphone "format" through. |
143 | // |
144 | // Call stbi_set_unpremultiply_on_load(1) as well to force a divide per |
145 | // pixel to remove any premultiplied alpha *only* if the image file explicitly |
146 | // says there's premultiplied data (currently only happens in iPhone images, |
147 | // and only if iPhone convert-to-rgb processing is on). |
148 | // |
149 | // =========================================================================== |
150 | // |
151 | // HDR image support (disable by defining STBI_NO_HDR) |
152 | // |
153 | // stb_image now supports loading HDR images in general, and currently |
154 | // the Radiance .HDR file format, although the support is provided |
155 | // generically. You can still load any file through the existing interface; |
156 | // if you attempt to load an HDR file, it will be automatically remapped to |
157 | // LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1; |
158 | // both of these constants can be reconfigured through this interface: |
159 | // |
160 | // stbi_hdr_to_ldr_gamma(2.2f); |
161 | // stbi_hdr_to_ldr_scale(1.0f); |
162 | // |
163 | // (note, do not use _inverse_ constants; stbi_image will invert them |
164 | // appropriately). |
165 | // |
166 | // Additionally, there is a new, parallel interface for loading files as |
167 | // (linear) floats to preserve the full dynamic range: |
168 | // |
169 | // float *data = stbi_loadf(filename, &x, &y, &n, 0); |
170 | // |
171 | // If you load LDR images through this interface, those images will |
172 | // be promoted to floating point values, run through the inverse of |
173 | // constants corresponding to the above: |
174 | // |
175 | // stbi_ldr_to_hdr_scale(1.0f); |
176 | // stbi_ldr_to_hdr_gamma(2.2f); |
177 | // |
178 | // Finally, given a filename (or an open file or memory block--see header |
179 | // file for details) containing image data, you can query for the "most |
180 | // appropriate" interface to use (that is, whether the image is HDR or |
181 | // not), using: |
182 | // |
183 | // stbi_is_hdr(char *filename); |
184 | |
185 | #ifndef STBI_NO_STDIO |
186 | #include <stdio.h> |
187 | #endif |
188 | |
189 | #define STBI_VERSION 1 |
190 | |
191 | enum |
192 | { |
193 | STBI_default = 0, // only used for req_comp |
194 | |
195 | STBI_grey = 1, |
196 | STBI_grey_alpha = 2, |
197 | STBI_rgb = 3, |
198 | STBI_rgb_alpha = 4 |
199 | }; |
200 | |
201 | typedef unsigned char stbi_uc; |
202 | |
203 | #ifdef __cplusplus |
204 | extern "C" { |
205 | #endif |
206 | |
207 | // PRIMARY API - works on images of any type |
208 | |
209 | // load image by filename, open file, or memory buffer |
210 | extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
211 | |
212 | #ifndef STBI_NO_STDIO |
213 | extern stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
214 | extern stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
215 | // for stbi_load_from_file, file pointer is left pointing immediately after image |
216 | #endif |
217 | |
218 | #ifndef STBI_NO_HDR |
219 | extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
220 | |
221 | #ifndef STBI_NO_STDIO |
222 | extern float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp); |
223 | extern float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
224 | #endif |
225 | |
226 | extern void stbi_hdr_to_ldr_gamma(float gamma); |
227 | extern void stbi_hdr_to_ldr_scale(float scale); |
228 | |
229 | extern void stbi_ldr_to_hdr_gamma(float gamma); |
230 | extern void stbi_ldr_to_hdr_scale(float scale); |
231 | #endif // STBI_NO_HDR |
232 | |
233 | // get a VERY brief reason for failure |
234 | // NOT THREADSAFE |
235 | extern const char *stbi_failure_reason (void); |
236 | |
237 | // free the loaded image -- this is just free() |
238 | extern void stbi_image_free (void *retval_from_stbi_load); |
239 | |
240 | // get image dimensions & components without fully decoding |
241 | extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
242 | extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len); |
243 | |
244 | #ifndef STBI_NO_STDIO |
245 | extern int stbi_info (char const *filename, int *x, int *y, int *comp); |
246 | extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp); |
247 | |
248 | extern int stbi_is_hdr (char const *filename); |
249 | extern int stbi_is_hdr_from_file(FILE *f); |
250 | #endif |
251 | |
252 | // for image formats that explicitly notate that they have premultiplied alpha, |
253 | // we just return the colors as stored in the file. set this flag to force |
254 | // unpremultiplication. results are undefined if the unpremultiply overflow. |
255 | extern void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply); |
256 | |
257 | // indicate whether we should process iphone images back to canonical format, |
258 | // or just pass them through "as-is" |
259 | extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert); |
260 | |
261 | |
262 | // ZLIB client - used by PNG, available for other purposes |
263 | |
264 | extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen); |
265 | extern char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int ); |
266 | extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen); |
267 | extern int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); |
268 | |
269 | extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen); |
270 | extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen); |
271 | |
272 | // define new loaders |
273 | typedef struct |
274 | { |
275 | int (*test_memory)(stbi_uc const *buffer, int len); |
276 | stbi_uc * (*load_from_memory)(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
277 | #ifndef STBI_NO_STDIO |
278 | int (*test_file)(FILE *f); |
279 | stbi_uc * (*load_from_file)(FILE *f, int *x, int *y, int *comp, int req_comp); |
280 | #endif |
281 | } stbi_loader; |
282 | |
283 | // register a loader by filling out the above structure (you must define ALL functions) |
284 | // returns 1 if added or already added, 0 if not added (too many loaders) |
285 | // NOT THREADSAFE |
286 | extern int stbi_register_loader(stbi_loader *loader); |
287 | |
288 | // define faster low-level operations (typically SIMD support) |
289 | #ifdef STBI_SIMD |
290 | typedef void (*stbi_idct_8x8)(stbi_uc *out, int out_stride, short data[64], unsigned short *dequantize); |
291 | // compute an integer IDCT on "input" |
292 | // input[x] = data[x] * dequantize[x] |
293 | // write results to 'out': 64 samples, each run of 8 spaced by 'out_stride' |
294 | // CLAMP results to 0..255 |
295 | typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc *output, stbi_uc const *y, stbi_uc const *cb, stbi_uc const *cr, int count, int step); |
296 | // compute a conversion from YCbCr to RGB |
297 | // 'count' pixels |
298 | // write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B |
299 | // y: Y input channel |
300 | // cb: Cb input channel; scale/biased to be 0..255 |
301 | // cr: Cr input channel; scale/biased to be 0..255 |
302 | |
303 | extern void stbi_install_idct(stbi_idct_8x8 func); |
304 | extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func); |
305 | #endif // STBI_SIMD |
306 | |
307 | |
308 | |
309 | |
310 | // TYPE-SPECIFIC ACCESS |
311 | |
312 | #ifdef STBI_TYPE_SPECIFIC_FUNCTIONS |
313 | |
314 | // is it a jpeg? |
315 | extern int stbi_jpeg_test_memory (stbi_uc const *buffer, int len); |
316 | extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
317 | extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
318 | |
319 | #ifndef STBI_NO_STDIO |
320 | extern stbi_uc *stbi_jpeg_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
321 | extern int stbi_jpeg_test_file (FILE *f); |
322 | extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
323 | |
324 | extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); |
325 | extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); |
326 | #endif |
327 | |
328 | // is it a png? |
329 | extern int stbi_png_test_memory (stbi_uc const *buffer, int len); |
330 | extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
331 | extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
332 | |
333 | #ifndef STBI_NO_STDIO |
334 | extern stbi_uc *stbi_png_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
335 | extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); |
336 | extern int stbi_png_test_file (FILE *f); |
337 | extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
338 | extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); |
339 | #endif |
340 | |
341 | // is it a bmp? |
342 | extern int stbi_bmp_test_memory (stbi_uc const *buffer, int len); |
343 | |
344 | extern stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
345 | extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
346 | #ifndef STBI_NO_STDIO |
347 | extern int stbi_bmp_test_file (FILE *f); |
348 | extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
349 | #endif |
350 | |
351 | // is it a tga? |
352 | extern int stbi_tga_test_memory (stbi_uc const *buffer, int len); |
353 | |
354 | extern stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
355 | extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
356 | extern int stbi_tga_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
357 | #ifndef STBI_NO_STDIO |
358 | extern int stbi_tga_info_from_file (FILE *f, int *x, int *y, int *comp); |
359 | extern int stbi_tga_test_file (FILE *f); |
360 | extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
361 | #endif |
362 | |
363 | // is it a psd? |
364 | extern int stbi_psd_test_memory (stbi_uc const *buffer, int len); |
365 | |
366 | extern stbi_uc *stbi_psd_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
367 | extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
368 | #ifndef STBI_NO_STDIO |
369 | extern int stbi_psd_test_file (FILE *f); |
370 | extern stbi_uc *stbi_psd_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
371 | #endif |
372 | |
373 | // is it an hdr? |
374 | extern int stbi_hdr_test_memory (stbi_uc const *buffer, int len); |
375 | |
376 | extern float * stbi_hdr_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
377 | extern float * stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
378 | #ifndef STBI_NO_STDIO |
379 | extern int stbi_hdr_test_file (FILE *f); |
380 | extern float * stbi_hdr_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
381 | #endif |
382 | |
383 | // is it a pic? |
384 | extern int stbi_pic_test_memory (stbi_uc const *buffer, int len); |
385 | |
386 | extern stbi_uc *stbi_pic_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
387 | extern stbi_uc *stbi_pic_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
388 | #ifndef STBI_NO_STDIO |
389 | extern int stbi_pic_test_file (FILE *f); |
390 | extern stbi_uc *stbi_pic_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
391 | #endif |
392 | |
393 | // is it a gif? |
394 | extern int stbi_gif_test_memory (stbi_uc const *buffer, int len); |
395 | |
396 | extern stbi_uc *stbi_gif_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
397 | extern stbi_uc *stbi_gif_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
398 | extern int stbi_gif_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
399 | |
400 | #ifndef STBI_NO_STDIO |
401 | extern int stbi_gif_test_file (FILE *f); |
402 | extern stbi_uc *stbi_gif_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
403 | extern int stbi_gif_info (char const *filename, int *x, int *y, int *comp); |
404 | extern int stbi_gif_info_from_file (FILE *f, int *x, int *y, int *comp); |
405 | #endif |
406 | |
407 | #endif//STBI_TYPE_SPECIFIC_FUNCTIONS |
408 | |
409 | |
410 | |
411 | |
412 | #ifdef __cplusplus |
413 | } |
414 | #endif |
415 | |
416 | // |
417 | // |
418 | //// end header file ///////////////////////////////////////////////////// |
419 | #endif // STBI_INCLUDE_STB_IMAGE_H |
420 | |
421 | #ifndef STBI_HEADER_FILE_ONLY |
422 | |
423 | #ifndef STBI_NO_HDR |
424 | #include <math.h> // ldexp |
425 | #include <string.h> // strcmp |
426 | #endif |
427 | |
428 | #ifndef STBI_NO_STDIO |
429 | #include <stdio.h> |
430 | #endif |
431 | #ifdef _KERNEL |
432 | #include <sys/cdefs.h> |
433 | __KERNEL_RCSID(0, "$NetBSD: stb_image.c,v 1.8 2016/01/21 17:17:53 christos Exp $" ); |
434 | #include <sys/param.h> |
435 | #include <sys/systm.h> |
436 | #include <sys/kernel.h> |
437 | #include <sys/types.h> |
438 | #include <sys/malloc.h> |
439 | #else |
440 | #include <stdlib.h> |
441 | #include <memory.h> |
442 | #include <assert.h> |
443 | #include <stdarg.h> |
444 | #endif |
445 | |
446 | #ifdef _KERNEL |
447 | #define MALLOC(size) malloc((size), M_TEMP, M_WAITOK) |
448 | #define REALLOC(ptr, size) realloc((ptr), (size), M_TEMP, M_WAITOK) |
449 | #define FREE(ptr) \ |
450 | do { if (ptr) free((ptr), M_TEMP); } while (/*CONSTCOND*/0) |
451 | #else |
452 | #define MALLOC(size) malloc((size)) |
453 | #define REALLOC(ptr, size) realloc((ptr), (size)) |
454 | #define FREE(ptr) free((ptr)) |
455 | #endif |
456 | |
457 | #ifndef _MSC_VER |
458 | #ifdef __cplusplus |
459 | #define __forceinline inline |
460 | #else |
461 | #define __forceinline |
462 | #endif |
463 | #endif |
464 | |
465 | |
466 | // implementation: |
467 | typedef unsigned char uint8; |
468 | typedef unsigned short uint16; |
469 | typedef signed short int16; |
470 | typedef unsigned int uint32; |
471 | typedef signed int int32; |
472 | #ifndef __NetBSD__ |
473 | typedef unsigned int uint; |
474 | #endif |
475 | |
476 | // should produce compiler error if size is wrong |
477 | typedef unsigned char validate_uint32[sizeof(uint32)==4 ? 1 : -1]; |
478 | |
479 | #if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE) |
480 | #define STBI_NO_WRITE |
481 | #endif |
482 | |
483 | #define STBI_NOTUSED(v) v=v |
484 | |
485 | #ifdef _MSC_VER |
486 | #define STBI_HAS_LRTOL |
487 | #endif |
488 | |
489 | #ifdef STBI_HAS_LRTOL |
490 | #define stbi_lrot(x,y) _lrotl(x,y) |
491 | #else |
492 | #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y)))) |
493 | #endif |
494 | |
495 | ////////////////////////////////////////////////////////////////////////////// |
496 | // |
497 | // Generic API that works on all image types |
498 | // |
499 | |
500 | // deprecated functions |
501 | |
502 | // is it a jpeg? |
503 | extern int stbi_jpeg_test_memory (stbi_uc const *buffer, int len); |
504 | extern stbi_uc *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
505 | extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
506 | |
507 | #ifndef STBI_NO_STDIO |
508 | extern stbi_uc *stbi_jpeg_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
509 | extern int stbi_jpeg_test_file (FILE *f); |
510 | extern stbi_uc *stbi_jpeg_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
511 | |
512 | extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); |
513 | extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); |
514 | #endif |
515 | |
516 | // is it a png? |
517 | extern int stbi_png_test_memory (stbi_uc const *buffer, int len); |
518 | extern stbi_uc *stbi_png_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
519 | extern int stbi_png_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
520 | |
521 | #ifndef STBI_NO_STDIO |
522 | extern stbi_uc *stbi_png_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
523 | extern int stbi_png_info (char const *filename, int *x, int *y, int *comp); |
524 | extern int stbi_png_test_file (FILE *f); |
525 | extern stbi_uc *stbi_png_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
526 | extern int stbi_png_info_from_file (FILE *f, int *x, int *y, int *comp); |
527 | #endif |
528 | |
529 | // is it a bmp? |
530 | extern int stbi_bmp_test_memory (stbi_uc const *buffer, int len); |
531 | |
532 | extern stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
533 | extern stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
534 | #ifndef STBI_NO_STDIO |
535 | extern int stbi_bmp_test_file (FILE *f); |
536 | extern stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
537 | #endif |
538 | |
539 | // is it a tga? |
540 | extern int stbi_tga_test_memory (stbi_uc const *buffer, int len); |
541 | |
542 | extern stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
543 | extern stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
544 | #ifndef STBI_NO_STDIO |
545 | extern int stbi_tga_test_file (FILE *f); |
546 | extern stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
547 | #endif |
548 | |
549 | // is it a psd? |
550 | extern int stbi_psd_test_memory (stbi_uc const *buffer, int len); |
551 | |
552 | extern stbi_uc *stbi_psd_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
553 | extern stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
554 | #ifndef STBI_NO_STDIO |
555 | extern int stbi_psd_test_file (FILE *f); |
556 | extern stbi_uc *stbi_psd_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
557 | #endif |
558 | |
559 | // is it an hdr? |
560 | extern int stbi_hdr_test_memory (stbi_uc const *buffer, int len); |
561 | |
562 | extern float * stbi_hdr_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
563 | extern float * stbi_hdr_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
564 | #ifndef STBI_NO_STDIO |
565 | extern int stbi_hdr_test_file (FILE *f); |
566 | extern float * stbi_hdr_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
567 | #endif |
568 | |
569 | // is it a pic? |
570 | extern int stbi_pic_test_memory (stbi_uc const *buffer, int len); |
571 | |
572 | extern stbi_uc *stbi_pic_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
573 | extern stbi_uc *stbi_pic_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
574 | #ifndef STBI_NO_STDIO |
575 | extern int stbi_pic_test_file (FILE *f); |
576 | extern stbi_uc *stbi_pic_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
577 | #endif |
578 | |
579 | // is it a gif? |
580 | extern int stbi_gif_test_memory (stbi_uc const *buffer, int len); |
581 | |
582 | extern stbi_uc *stbi_gif_load (char const *filename, int *x, int *y, int *comp, int req_comp); |
583 | extern stbi_uc *stbi_gif_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp); |
584 | extern int stbi_gif_info_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
585 | |
586 | #ifndef STBI_NO_STDIO |
587 | extern int stbi_gif_test_file (FILE *f); |
588 | extern stbi_uc *stbi_gif_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp); |
589 | extern int stbi_gif_info (char const *filename, int *x, int *y, int *comp); |
590 | extern int stbi_gif_info_from_file (FILE *f, int *x, int *y, int *comp); |
591 | #endif |
592 | |
593 | |
594 | // this is not threadsafe |
595 | static const char *failure_reason; |
596 | |
597 | const char *stbi_failure_reason(void) |
598 | { |
599 | return failure_reason; |
600 | } |
601 | |
602 | #ifndef STBI_NO_FAILURE_STRINGS |
603 | static int e(const char *str) |
604 | { |
605 | failure_reason = str; |
606 | return 0; |
607 | } |
608 | #endif |
609 | |
610 | #ifdef STBI_NO_FAILURE_STRINGS |
611 | #define e(x,y) 0 |
612 | #elif defined(STBI_FAILURE_USERMSG) |
613 | #define e(x,y) e(y) |
614 | #else |
615 | #define e(x,y) e(x) |
616 | #endif |
617 | |
618 | #define epf(x,y) ((float *) (e(x,y)?NULL:NULL)) |
619 | #define epuc(x,y) ((unsigned char *) (e(x,y)?NULL:NULL)) |
620 | |
621 | void stbi_image_free(void *retval_from_stbi_load) |
622 | { |
623 | FREE(retval_from_stbi_load); |
624 | } |
625 | |
626 | #define MAX_LOADERS 32 |
627 | stbi_loader *loaders[MAX_LOADERS]; |
628 | static int max_loaders = 0; |
629 | |
630 | int stbi_register_loader(stbi_loader *loader) |
631 | { |
632 | int i; |
633 | for (i=0; i < MAX_LOADERS; ++i) { |
634 | // already present? |
635 | if (loaders[i] == loader) |
636 | return 1; |
637 | // end of the list? |
638 | if (loaders[i] == NULL) { |
639 | loaders[i] = loader; |
640 | max_loaders = i+1; |
641 | return 1; |
642 | } |
643 | } |
644 | // no room for it |
645 | return 0; |
646 | } |
647 | |
648 | #ifndef STBI_NO_HDR |
649 | static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp); |
650 | static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp); |
651 | #endif |
652 | |
653 | #ifndef STBI_NO_STDIO |
654 | unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp) |
655 | { |
656 | FILE *f = fopen(filename, "rb" ); |
657 | unsigned char *result; |
658 | if (!f) return epuc("can't fopen" , "Unable to open file" ); |
659 | result = stbi_load_from_file(f,x,y,comp,req_comp); |
660 | fclose(f); |
661 | return result; |
662 | } |
663 | |
664 | unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
665 | { |
666 | int i; |
667 | if (stbi_jpeg_test_file(f)) return stbi_jpeg_load_from_file(f,x,y,comp,req_comp); |
668 | if (stbi_png_test_file(f)) return stbi_png_load_from_file(f,x,y,comp,req_comp); |
669 | if (stbi_bmp_test_file(f)) return stbi_bmp_load_from_file(f,x,y,comp,req_comp); |
670 | if (stbi_gif_test_file(f)) return stbi_gif_load_from_file(f,x,y,comp,req_comp); |
671 | if (stbi_psd_test_file(f)) return stbi_psd_load_from_file(f,x,y,comp,req_comp); |
672 | if (stbi_pic_test_file(f)) return stbi_pic_load_from_file(f,x,y,comp,req_comp); |
673 | |
674 | #ifndef STBI_NO_HDR |
675 | if (stbi_hdr_test_file(f)) { |
676 | float *hdr = stbi_hdr_load_from_file(f, x,y,comp,req_comp); |
677 | return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); |
678 | } |
679 | #endif |
680 | |
681 | for (i=0; i < max_loaders; ++i) |
682 | if (loaders[i]->test_file(f)) |
683 | return loaders[i]->load_from_file(f,x,y,comp,req_comp); |
684 | // test tga last because it's a crappy test! |
685 | if (stbi_tga_test_file(f)) |
686 | return stbi_tga_load_from_file(f,x,y,comp,req_comp); |
687 | return epuc("unknown image type" , "Image not of any known type, or corrupt" ); |
688 | } |
689 | #endif |
690 | |
691 | unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
692 | { |
693 | int i; |
694 | if (stbi_jpeg_test_memory(buffer,len)) return stbi_jpeg_load_from_memory(buffer,len,x,y,comp,req_comp); |
695 | if (stbi_png_test_memory(buffer,len)) return stbi_png_load_from_memory(buffer,len,x,y,comp,req_comp); |
696 | if (stbi_bmp_test_memory(buffer,len)) return stbi_bmp_load_from_memory(buffer,len,x,y,comp,req_comp); |
697 | if (stbi_gif_test_memory(buffer,len)) return stbi_gif_load_from_memory(buffer,len,x,y,comp,req_comp); |
698 | if (stbi_psd_test_memory(buffer,len)) return stbi_psd_load_from_memory(buffer,len,x,y,comp,req_comp); |
699 | if (stbi_pic_test_memory(buffer,len)) return stbi_pic_load_from_memory(buffer,len,x,y,comp,req_comp); |
700 | |
701 | #ifndef STBI_NO_HDR |
702 | if (stbi_hdr_test_memory(buffer, len)) { |
703 | float *hdr = stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); |
704 | return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp); |
705 | } |
706 | #endif |
707 | |
708 | for (i=0; i < max_loaders; ++i) |
709 | if (loaders[i]->test_memory(buffer,len)) |
710 | return loaders[i]->load_from_memory(buffer,len,x,y,comp,req_comp); |
711 | // test tga last because it's a crappy test! |
712 | if (stbi_tga_test_memory(buffer,len)) |
713 | return stbi_tga_load_from_memory(buffer,len,x,y,comp,req_comp); |
714 | return epuc("unknown image type" , "Image not of any known type, or corrupt" ); |
715 | } |
716 | |
717 | #ifndef STBI_NO_HDR |
718 | |
719 | #ifndef STBI_NO_STDIO |
720 | float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp) |
721 | { |
722 | FILE *f = fopen(filename, "rb" ); |
723 | float *result; |
724 | if (!f) return epf("can't fopen" , "Unable to open file" ); |
725 | result = stbi_loadf_from_file(f,x,y,comp,req_comp); |
726 | fclose(f); |
727 | return result; |
728 | } |
729 | |
730 | float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
731 | { |
732 | unsigned char *data; |
733 | #ifndef STBI_NO_HDR |
734 | if (stbi_hdr_test_file(f)) |
735 | return stbi_hdr_load_from_file(f,x,y,comp,req_comp); |
736 | #endif |
737 | data = stbi_load_from_file(f, x, y, comp, req_comp); |
738 | if (data) |
739 | return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); |
740 | return epf("unknown image type" , "Image not of any known type, or corrupt" ); |
741 | } |
742 | #endif |
743 | |
744 | float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
745 | { |
746 | stbi_uc *data; |
747 | #ifndef STBI_NO_HDR |
748 | if (stbi_hdr_test_memory(buffer, len)) |
749 | return stbi_hdr_load_from_memory(buffer, len,x,y,comp,req_comp); |
750 | #endif |
751 | data = stbi_load_from_memory(buffer, len, x, y, comp, req_comp); |
752 | if (data) |
753 | return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp); |
754 | return epf("unknown image type" , "Image not of any known type, or corrupt" ); |
755 | } |
756 | #endif |
757 | |
758 | // these is-hdr-or-not is defined independent of whether STBI_NO_HDR is |
759 | // defined, for API simplicity; if STBI_NO_HDR is defined, it always |
760 | // reports false! |
761 | |
762 | int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len) |
763 | { |
764 | #ifndef STBI_NO_HDR |
765 | return stbi_hdr_test_memory(buffer, len); |
766 | #else |
767 | STBI_NOTUSED(buffer); |
768 | STBI_NOTUSED(len); |
769 | return 0; |
770 | #endif |
771 | } |
772 | |
773 | #ifndef STBI_NO_STDIO |
774 | extern int stbi_is_hdr (char const *filename) |
775 | { |
776 | FILE *f = fopen(filename, "rb" ); |
777 | int result=0; |
778 | if (f) { |
779 | result = stbi_is_hdr_from_file(f); |
780 | fclose(f); |
781 | } |
782 | return result; |
783 | } |
784 | |
785 | extern int stbi_is_hdr_from_file(FILE *f) |
786 | { |
787 | #ifndef STBI_NO_HDR |
788 | return stbi_hdr_test_file(f); |
789 | #else |
790 | return 0; |
791 | #endif |
792 | } |
793 | |
794 | #endif |
795 | |
796 | #ifndef STBI_NO_HDR |
797 | static float h2l_gamma_i=1.0f/2.2f, h2l_scale_i=1.0f; |
798 | static float l2h_gamma=2.2f, l2h_scale=1.0f; |
799 | |
800 | void stbi_hdr_to_ldr_gamma(float gamma) { h2l_gamma_i = 1/gamma; } |
801 | void stbi_hdr_to_ldr_scale(float scale) { h2l_scale_i = 1/scale; } |
802 | |
803 | void stbi_ldr_to_hdr_gamma(float gamma) { l2h_gamma = gamma; } |
804 | void stbi_ldr_to_hdr_scale(float scale) { l2h_scale = scale; } |
805 | #endif |
806 | |
807 | |
808 | ////////////////////////////////////////////////////////////////////////////// |
809 | // |
810 | // Common code used by all image loaders |
811 | // |
812 | |
813 | enum |
814 | { |
815 | SCAN_load=0, |
816 | SCAN_type, |
817 | |
818 | }; |
819 | |
820 | typedef struct |
821 | { |
822 | uint32 img_x, img_y; |
823 | int img_n, img_out_n; |
824 | |
825 | #ifndef STBI_NO_STDIO |
826 | FILE *img_file; |
827 | int buflen; |
828 | uint8 buffer_start[128]; |
829 | int from_file; |
830 | #endif |
831 | uint8 const *img_buffer, *img_buffer_end; |
832 | } stbi; |
833 | |
834 | #ifndef STBI_NO_STDIO |
835 | static void start_file(stbi *s, FILE *f) |
836 | { |
837 | s->img_file = f; |
838 | s->buflen = sizeof(s->buffer_start); |
839 | s->img_buffer_end = s->buffer_start + s->buflen; |
840 | s->img_buffer = s->img_buffer_end; |
841 | s->from_file = 1; |
842 | } |
843 | #endif |
844 | |
845 | static void start_mem(stbi *s, uint8 const *buffer, int len) |
846 | { |
847 | #ifndef STBI_NO_STDIO |
848 | s->img_file = NULL; |
849 | s->from_file = 0; |
850 | #endif |
851 | s->img_buffer = (uint8 const *) buffer; |
852 | s->img_buffer_end = (uint8 const *) buffer+len; |
853 | } |
854 | |
855 | #ifndef STBI_NO_STDIO |
856 | static void refill_buffer(stbi *s) |
857 | { |
858 | int n = fread(s->buffer_start, 1, s->buflen, s->img_file); |
859 | if (n == 0) { |
860 | s->from_file = 0; |
861 | s->img_buffer = s->img_buffer_end-1; |
862 | #if 0 |
863 | *s->img_buffer = 0; |
864 | #endif |
865 | } else { |
866 | s->img_buffer = s->buffer_start; |
867 | s->img_buffer_end = s->buffer_start + n; |
868 | } |
869 | } |
870 | #endif |
871 | |
872 | __forceinline static int get8(stbi *s) |
873 | { |
874 | if (s->img_buffer < s->img_buffer_end) |
875 | return *s->img_buffer++; |
876 | #ifndef STBI_NO_STDIO |
877 | if (s->from_file) { |
878 | refill_buffer(s); |
879 | return *s->img_buffer++; |
880 | } |
881 | #endif |
882 | return 0; |
883 | } |
884 | |
885 | __forceinline static int at_eof(stbi *s) |
886 | { |
887 | #ifndef STBI_NO_STDIO |
888 | if (s->img_file) { |
889 | if (!feof(s->img_file)) return 0; |
890 | // if feof() is true, check if buffer = end |
891 | // special case: we've only got the special 0 character at the end |
892 | if (s->from_file == 0) return 1; |
893 | } |
894 | #endif |
895 | return s->img_buffer >= s->img_buffer_end; |
896 | } |
897 | |
898 | __forceinline static uint8 get8u(stbi *s) |
899 | { |
900 | return (uint8) get8(s); |
901 | } |
902 | |
903 | static void skip(stbi *s, int n) |
904 | { |
905 | #ifndef STBI_NO_STDIO |
906 | if (s->img_file) { |
907 | int blen = s->img_buffer_end - s->img_buffer; |
908 | if (blen < n) { |
909 | s->img_buffer = s->img_buffer_end; |
910 | fseek(s->img_file, n - blen, SEEK_CUR); |
911 | return; |
912 | } |
913 | } |
914 | #endif |
915 | s->img_buffer += n; |
916 | } |
917 | |
918 | static int getn(stbi *s, stbi_uc *buffer, int n) |
919 | { |
920 | #ifndef STBI_NO_STDIO |
921 | if (s->img_file) { |
922 | int blen = s->img_buffer_end - s->img_buffer; |
923 | if (blen < n) { |
924 | int res; |
925 | memcpy(buffer, s->img_buffer, blen); |
926 | res = ((int) fread(buffer + blen, 1, n - blen, s->img_file) == (n-blen)); |
927 | s->img_buffer = s->img_buffer_end; |
928 | return res; |
929 | } |
930 | } |
931 | #endif |
932 | if (s->img_buffer+n <= s->img_buffer_end) { |
933 | memcpy(buffer, s->img_buffer, n); |
934 | s->img_buffer += n; |
935 | return 1; |
936 | } else |
937 | return 0; |
938 | } |
939 | |
940 | static int get16(stbi *s) |
941 | { |
942 | int z = get8(s); |
943 | return (z << 8) + get8(s); |
944 | } |
945 | |
946 | static uint32 get32(stbi *s) |
947 | { |
948 | uint32 z = get16(s); |
949 | return (z << 16) + get16(s); |
950 | } |
951 | |
952 | static int get16le(stbi *s) |
953 | { |
954 | int z = get8(s); |
955 | return z + (get8(s) << 8); |
956 | } |
957 | |
958 | static uint32 get32le(stbi *s) |
959 | { |
960 | uint32 z = get16le(s); |
961 | return z + (get16le(s) << 16); |
962 | } |
963 | |
964 | ////////////////////////////////////////////////////////////////////////////// |
965 | // |
966 | // generic converter from built-in img_n to req_comp |
967 | // individual types do this automatically as much as possible (e.g. jpeg |
968 | // does all cases internally since it needs to colorspace convert anyway, |
969 | // and it never has alpha, so very few cases ). png can automatically |
970 | // interleave an alpha=255 channel, but falls back to this for other cases |
971 | // |
972 | // assume data buffer is malloced, so malloc a new one and free that one |
973 | // only failure mode is malloc failing |
974 | |
975 | static uint8 compute_y(int r, int g, int b) |
976 | { |
977 | return (uint8) (((r*77) + (g*150) + (29*b)) >> 8); |
978 | } |
979 | |
980 | static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp, uint x, uint y) |
981 | { |
982 | int i,j; |
983 | unsigned char *good; |
984 | |
985 | if (req_comp == img_n) return data; |
986 | assert(req_comp >= 1 && req_comp <= 4); |
987 | |
988 | good = MALLOC(req_comp * x * y); |
989 | if (good == NULL) { |
990 | FREE(data); |
991 | return epuc("outofmem" , "Out of memory" ); |
992 | } |
993 | |
994 | for (j=0; j < (int) y; ++j) { |
995 | unsigned char *src = data + j * x * img_n ; |
996 | unsigned char *dest = good + j * x * req_comp; |
997 | |
998 | #define COMBO(a,b) ((a)*8+(b)) |
999 | #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b) |
1000 | // convert source image with img_n components to one with req_comp components; |
1001 | // avoid switch per pixel, so use switch per scanline and massive macros |
1002 | switch (COMBO(img_n, req_comp)) { |
1003 | CASE(1,2) dest[0]=src[0], dest[1]=255; break; |
1004 | CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break; |
1005 | CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break; |
1006 | CASE(2,1) dest[0]=src[0]; break; |
1007 | CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break; |
1008 | CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break; |
1009 | CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break; |
1010 | CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break; |
1011 | CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break; |
1012 | CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break; |
1013 | CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break; |
1014 | CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break; |
1015 | default: assert(0); |
1016 | } |
1017 | #undef CASE |
1018 | } |
1019 | |
1020 | FREE(data); |
1021 | return good; |
1022 | } |
1023 | |
1024 | #ifndef STBI_NO_HDR |
1025 | static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp) |
1026 | { |
1027 | int i,k,n; |
1028 | float *output = MALLOC(x * y * comp * sizeof(float)); |
1029 | if (output == NULL) { FREE(data); return epf("outofmem" , "Out of memory" ); } |
1030 | // compute number of non-alpha components |
1031 | if (comp & 1) n = comp; else n = comp-1; |
1032 | for (i=0; i < x*y; ++i) { |
1033 | for (k=0; k < n; ++k) { |
1034 | output[i*comp + k] = (float) pow(data[i*comp+k]/255.0f, l2h_gamma) * l2h_scale; |
1035 | } |
1036 | if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f; |
1037 | } |
1038 | FREE(data); |
1039 | return output; |
1040 | } |
1041 | |
1042 | #define float2int(x) ((int) (x)) |
1043 | static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp) |
1044 | { |
1045 | int i,k,n; |
1046 | stbi_uc *output = MALLOC(x * y * comp); |
1047 | if (output == NULL) { FREE(data); return epuc("outofmem" , "Out of memory" ); } |
1048 | // compute number of non-alpha components |
1049 | if (comp & 1) n = comp; else n = comp-1; |
1050 | for (i=0; i < x*y; ++i) { |
1051 | for (k=0; k < n; ++k) { |
1052 | float z = (float) pow(data[i*comp+k]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f; |
1053 | if (z < 0) z = 0; |
1054 | if (z > 255) z = 255; |
1055 | output[i*comp + k] = (uint8) float2int(z); |
1056 | } |
1057 | if (k < comp) { |
1058 | float z = data[i*comp+k] * 255 + 0.5f; |
1059 | if (z < 0) z = 0; |
1060 | if (z > 255) z = 255; |
1061 | output[i*comp + k] = (uint8) float2int(z); |
1062 | } |
1063 | } |
1064 | FREE(data); |
1065 | return output; |
1066 | } |
1067 | #endif |
1068 | |
1069 | ////////////////////////////////////////////////////////////////////////////// |
1070 | // |
1071 | // "baseline" JPEG/JFIF decoder (not actually fully baseline implementation) |
1072 | // |
1073 | // simple implementation |
1074 | // - channel subsampling of at most 2 in each dimension |
1075 | // - doesn't support delayed output of y-dimension |
1076 | // - simple interface (only one output format: 8-bit interleaved RGB) |
1077 | // - doesn't try to recover corrupt jpegs |
1078 | // - doesn't allow partial loading, loading multiple at once |
1079 | // - still fast on x86 (copying globals into locals doesn't help x86) |
1080 | // - allocates lots of intermediate memory (full size of all components) |
1081 | // - non-interleaved case requires this anyway |
1082 | // - allows good upsampling (see next) |
1083 | // high-quality |
1084 | // - upsampled channels are bilinearly interpolated, even across blocks |
1085 | // - quality integer IDCT derived from IJG's 'slow' |
1086 | // performance |
1087 | // - fast huffman; reasonable integer IDCT |
1088 | // - uses a lot of intermediate memory, could cache poorly |
1089 | // - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4 |
1090 | // stb_jpeg: 1.34 seconds (MSVC6, default release build) |
1091 | // stb_jpeg: 1.06 seconds (MSVC6, processor = Pentium Pro) |
1092 | // IJL11.dll: 1.08 seconds (compiled by intel) |
1093 | // IJG 1998: 0.98 seconds (MSVC6, makefile provided by IJG) |
1094 | // IJG 1998: 0.95 seconds (MSVC6, makefile + proc=PPro) |
1095 | |
1096 | // huffman decoding acceleration |
1097 | #define FAST_BITS 9 // larger handles more cases; smaller stomps less cache |
1098 | |
1099 | typedef struct |
1100 | { |
1101 | uint8 fast[1 << FAST_BITS]; |
1102 | // weirdly, repacking this into AoS is a 10% speed loss, instead of a win |
1103 | uint16 code[256]; |
1104 | uint8 values[256]; |
1105 | uint8 size[257]; |
1106 | unsigned int maxcode[18]; |
1107 | int delta[17]; // old 'firstsymbol' - old 'firstcode' |
1108 | } huffman; |
1109 | |
1110 | typedef struct |
1111 | { |
1112 | #ifdef STBI_SIMD |
1113 | unsigned short dequant2[4][64]; |
1114 | #endif |
1115 | stbi s; |
1116 | huffman huff_dc[4]; |
1117 | huffman huff_ac[4]; |
1118 | uint8 dequant[4][64]; |
1119 | |
1120 | // sizes for components, interleaved MCUs |
1121 | int img_h_max, img_v_max; |
1122 | int img_mcu_x, img_mcu_y; |
1123 | int img_mcu_w, img_mcu_h; |
1124 | |
1125 | // definition of jpeg image component |
1126 | struct |
1127 | { |
1128 | int id; |
1129 | int h,v; |
1130 | int tq; |
1131 | int hd,ha; |
1132 | int dc_pred; |
1133 | |
1134 | int x,y,w2,h2; |
1135 | uint8 *data; |
1136 | void *raw_data; |
1137 | uint8 *linebuf; |
1138 | } img_comp[4]; |
1139 | |
1140 | uint32 code_buffer; // jpeg entropy-coded buffer |
1141 | int code_bits; // number of valid bits |
1142 | unsigned char marker; // marker seen while filling entropy buffer |
1143 | int nomore; // flag if we saw a marker so must stop |
1144 | |
1145 | int scan_n, order[4]; |
1146 | int restart_interval, todo; |
1147 | } jpeg; |
1148 | |
1149 | static int build_huffman(huffman *h, int *count) |
1150 | { |
1151 | int i,j,k=0,code; |
1152 | // build size list for each symbol (from JPEG spec) |
1153 | for (i=0; i < 16; ++i) |
1154 | for (j=0; j < count[i]; ++j) |
1155 | h->size[k++] = (uint8) (i+1); |
1156 | h->size[k] = 0; |
1157 | |
1158 | // compute actual symbols (from jpeg spec) |
1159 | code = 0; |
1160 | k = 0; |
1161 | for(j=1; j <= 16; ++j) { |
1162 | // compute delta to add to code to compute symbol id |
1163 | h->delta[j] = k - code; |
1164 | if (h->size[k] == j) { |
1165 | while (h->size[k] == j) |
1166 | h->code[k++] = (uint16) (code++); |
1167 | if (code-1 >= (1 << j)) return e("bad code lengths" ,"Corrupt JPEG" ); |
1168 | } |
1169 | // compute largest code + 1 for this size, preshifted as needed later |
1170 | h->maxcode[j] = code << (16-j); |
1171 | code <<= 1; |
1172 | } |
1173 | h->maxcode[j] = 0xffffffff; |
1174 | |
1175 | // build non-spec acceleration table; 255 is flag for not-accelerated |
1176 | memset(h->fast, 255, 1 << FAST_BITS); |
1177 | for (i=0; i < k; ++i) { |
1178 | int s = h->size[i]; |
1179 | if (s <= FAST_BITS) { |
1180 | int c = h->code[i] << (FAST_BITS-s); |
1181 | int m = 1 << (FAST_BITS-s); |
1182 | for (j=0; j < m; ++j) { |
1183 | h->fast[c+j] = (uint8) i; |
1184 | } |
1185 | } |
1186 | } |
1187 | return 1; |
1188 | } |
1189 | |
1190 | static void grow_buffer_unsafe(jpeg *j) |
1191 | { |
1192 | do { |
1193 | int b = j->nomore ? 0 : get8(&j->s); |
1194 | if (b == 0xff) { |
1195 | int c = get8(&j->s); |
1196 | if (c != 0) { |
1197 | j->marker = (unsigned char) c; |
1198 | j->nomore = 1; |
1199 | return; |
1200 | } |
1201 | } |
1202 | j->code_buffer |= b << (24 - j->code_bits); |
1203 | j->code_bits += 8; |
1204 | } while (j->code_bits <= 24); |
1205 | } |
1206 | |
1207 | // (1 << n) - 1 |
1208 | static uint32 bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535}; |
1209 | |
1210 | // decode a jpeg huffman value from the bitstream |
1211 | __forceinline static int decode(jpeg *j, huffman *h) |
1212 | { |
1213 | unsigned int temp; |
1214 | int c,k; |
1215 | |
1216 | if (j->code_bits < 16) grow_buffer_unsafe(j); |
1217 | |
1218 | // look at the top FAST_BITS and determine what symbol ID it is, |
1219 | // if the code is <= FAST_BITS |
1220 | c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1); |
1221 | k = h->fast[c]; |
1222 | if (k < 255) { |
1223 | int s = h->size[k]; |
1224 | if (s > j->code_bits) |
1225 | return -1; |
1226 | j->code_buffer <<= s; |
1227 | j->code_bits -= s; |
1228 | return h->values[k]; |
1229 | } |
1230 | |
1231 | // naive test is to shift the code_buffer down so k bits are |
1232 | // valid, then test against maxcode. To speed this up, we've |
1233 | // preshifted maxcode left so that it has (16-k) 0s at the |
1234 | // end; in other words, regardless of the number of bits, it |
1235 | // wants to be compared against something shifted to have 16; |
1236 | // that way we don't need to shift inside the loop. |
1237 | temp = j->code_buffer >> 16; |
1238 | for (k=FAST_BITS+1 ; ; ++k) |
1239 | if (temp < h->maxcode[k]) |
1240 | break; |
1241 | if (k == 17) { |
1242 | // error! code not found |
1243 | j->code_bits -= 16; |
1244 | return -1; |
1245 | } |
1246 | |
1247 | if (k > j->code_bits) |
1248 | return -1; |
1249 | |
1250 | // convert the huffman code to the symbol id |
1251 | c = ((j->code_buffer >> (32 - k)) & bmask[k]) + h->delta[k]; |
1252 | assert((((j->code_buffer) >> (32 - h->size[c])) & bmask[h->size[c]]) == h->code[c]); |
1253 | |
1254 | // convert the id to a symbol |
1255 | j->code_bits -= k; |
1256 | j->code_buffer <<= k; |
1257 | return h->values[c]; |
1258 | } |
1259 | |
1260 | // combined JPEG 'receive' and JPEG 'extend', since baseline |
1261 | // always extends everything it receives. |
1262 | __forceinline static int extend_receive(jpeg *j, int n) |
1263 | { |
1264 | unsigned int m = 1 << (n-1); |
1265 | unsigned int k; |
1266 | if (j->code_bits < n) grow_buffer_unsafe(j); |
1267 | |
1268 | #if 1 |
1269 | k = stbi_lrot(j->code_buffer, n); |
1270 | j->code_buffer = k & ~bmask[n]; |
1271 | k &= bmask[n]; |
1272 | j->code_bits -= n; |
1273 | #else |
1274 | k = (j->code_buffer >> (32 - n)) & bmask[n]; |
1275 | j->code_bits -= n; |
1276 | j->code_buffer <<= n; |
1277 | #endif |
1278 | // the following test is probably a random branch that won't |
1279 | // predict well. I tried to table accelerate it but failed. |
1280 | // maybe it's compiling as a conditional move? |
1281 | if (k < m) |
1282 | return (-1 << n) + k + 1; |
1283 | else |
1284 | return k; |
1285 | } |
1286 | |
1287 | // given a value that's at position X in the zigzag stream, |
1288 | // where does it appear in the 8x8 matrix coded as row-major? |
1289 | static uint8 dezigzag[64+15] = |
1290 | { |
1291 | 0, 1, 8, 16, 9, 2, 3, 10, |
1292 | 17, 24, 32, 25, 18, 11, 4, 5, |
1293 | 12, 19, 26, 33, 40, 48, 41, 34, |
1294 | 27, 20, 13, 6, 7, 14, 21, 28, |
1295 | 35, 42, 49, 56, 57, 50, 43, 36, |
1296 | 29, 22, 15, 23, 30, 37, 44, 51, |
1297 | 58, 59, 52, 45, 38, 31, 39, 46, |
1298 | 53, 60, 61, 54, 47, 55, 62, 63, |
1299 | // let corrupt input sample past end |
1300 | 63, 63, 63, 63, 63, 63, 63, 63, |
1301 | 63, 63, 63, 63, 63, 63, 63 |
1302 | }; |
1303 | |
1304 | // decode one 64-entry block-- |
1305 | static int decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b) |
1306 | { |
1307 | int diff,dc,k; |
1308 | int t = decode(j, hdc); |
1309 | if (t < 0) return e("bad huffman code" ,"Corrupt JPEG" ); |
1310 | |
1311 | // 0 all the ac values now so we can do it 32-bits at a time |
1312 | memset(data,0,64*sizeof(data[0])); |
1313 | |
1314 | diff = t ? extend_receive(j, t) : 0; |
1315 | dc = j->img_comp[b].dc_pred + diff; |
1316 | j->img_comp[b].dc_pred = dc; |
1317 | data[0] = (short) dc; |
1318 | |
1319 | // decode AC components, see JPEG spec |
1320 | k = 1; |
1321 | do { |
1322 | int r,s; |
1323 | int rs = decode(j, hac); |
1324 | if (rs < 0) return e("bad huffman code" ,"Corrupt JPEG" ); |
1325 | s = rs & 15; |
1326 | r = rs >> 4; |
1327 | if (s == 0) { |
1328 | if (rs != 0xf0) break; // end block |
1329 | k += 16; |
1330 | } else { |
1331 | k += r; |
1332 | // decode into unzigzag'd location |
1333 | data[dezigzag[k++]] = (short) extend_receive(j,s); |
1334 | } |
1335 | } while (k < 64); |
1336 | return 1; |
1337 | } |
1338 | |
1339 | // take a -128..127 value and clamp it and convert to 0..255 |
1340 | __forceinline static uint8 clamp(int x) |
1341 | { |
1342 | // trick to use a single test to catch both cases |
1343 | if ((unsigned int) x > 255) { |
1344 | if (x < 0) return 0; |
1345 | if (x > 255) return 255; |
1346 | } |
1347 | return (uint8) x; |
1348 | } |
1349 | |
1350 | #define f2f(x) (int) (((x) * 4096 + 0.5)) |
1351 | #define fsh(x) ((x) << 12) |
1352 | |
1353 | // derived from jidctint -- DCT_ISLOW |
1354 | #define IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \ |
1355 | int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \ |
1356 | p2 = s2; \ |
1357 | p3 = s6; \ |
1358 | p1 = (p2+p3) * f2f(0.5411961f); \ |
1359 | t2 = p1 + p3*f2f(-1.847759065f); \ |
1360 | t3 = p1 + p2*f2f( 0.765366865f); \ |
1361 | p2 = s0; \ |
1362 | p3 = s4; \ |
1363 | t0 = fsh(p2+p3); \ |
1364 | t1 = fsh(p2-p3); \ |
1365 | x0 = t0+t3; \ |
1366 | x3 = t0-t3; \ |
1367 | x1 = t1+t2; \ |
1368 | x2 = t1-t2; \ |
1369 | t0 = s7; \ |
1370 | t1 = s5; \ |
1371 | t2 = s3; \ |
1372 | t3 = s1; \ |
1373 | p3 = t0+t2; \ |
1374 | p4 = t1+t3; \ |
1375 | p1 = t0+t3; \ |
1376 | p2 = t1+t2; \ |
1377 | p5 = (p3+p4)*f2f( 1.175875602f); \ |
1378 | t0 = t0*f2f( 0.298631336f); \ |
1379 | t1 = t1*f2f( 2.053119869f); \ |
1380 | t2 = t2*f2f( 3.072711026f); \ |
1381 | t3 = t3*f2f( 1.501321110f); \ |
1382 | p1 = p5 + p1*f2f(-0.899976223f); \ |
1383 | p2 = p5 + p2*f2f(-2.562915447f); \ |
1384 | p3 = p3*f2f(-1.961570560f); \ |
1385 | p4 = p4*f2f(-0.390180644f); \ |
1386 | t3 += p1+p4; \ |
1387 | t2 += p2+p3; \ |
1388 | t1 += p2+p4; \ |
1389 | t0 += p1+p3; |
1390 | |
1391 | #ifdef STBI_SIMD |
1392 | typedef unsigned short stbi_dequantize_t; |
1393 | #else |
1394 | typedef uint8 stbi_dequantize_t; |
1395 | #endif |
1396 | |
1397 | // .344 seconds on 3*anemones.jpg |
1398 | static void idct_block(uint8 *out, int out_stride, short data[64], stbi_dequantize_t *dequantize) |
1399 | { |
1400 | int i,val[64],*v=val; |
1401 | stbi_dequantize_t *dq = dequantize; |
1402 | uint8 *o; |
1403 | short *d = data; |
1404 | |
1405 | // columns |
1406 | for (i=0; i < 8; ++i,++d,++dq, ++v) { |
1407 | // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing |
1408 | if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0 |
1409 | && d[40]==0 && d[48]==0 && d[56]==0) { |
1410 | // no shortcut 0 seconds |
1411 | // (1|2|3|4|5|6|7)==0 0 seconds |
1412 | // all separate -0.047 seconds |
1413 | // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds |
1414 | int dcterm = d[0] * dq[0] << 2; |
1415 | v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm; |
1416 | } else { |
1417 | IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24], |
1418 | d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56]) |
1419 | // constants scaled things up by 1<<12; let's bring them back |
1420 | // down, but keep 2 extra bits of precision |
1421 | x0 += 512; x1 += 512; x2 += 512; x3 += 512; |
1422 | v[ 0] = (x0+t3) >> 10; |
1423 | v[56] = (x0-t3) >> 10; |
1424 | v[ 8] = (x1+t2) >> 10; |
1425 | v[48] = (x1-t2) >> 10; |
1426 | v[16] = (x2+t1) >> 10; |
1427 | v[40] = (x2-t1) >> 10; |
1428 | v[24] = (x3+t0) >> 10; |
1429 | v[32] = (x3-t0) >> 10; |
1430 | } |
1431 | } |
1432 | |
1433 | for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) { |
1434 | // no fast case since the first 1D IDCT spread components out |
1435 | IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7]) |
1436 | // constants scaled things up by 1<<12, plus we had 1<<2 from first |
1437 | // loop, plus horizontal and vertical each scale by sqrt(8) so together |
1438 | // we've got an extra 1<<3, so 1<<17 total we need to remove. |
1439 | // so we want to round that, which means adding 0.5 * 1<<17, |
1440 | // aka 65536. Also, we'll end up with -128 to 127 that we want |
1441 | // to encode as 0..255 by adding 128, so we'll add that before the shift |
1442 | x0 += 65536 + (128<<17); |
1443 | x1 += 65536 + (128<<17); |
1444 | x2 += 65536 + (128<<17); |
1445 | x3 += 65536 + (128<<17); |
1446 | // tried computing the shifts into temps, or'ing the temps to see |
1447 | // if any were out of range, but that was slower |
1448 | o[0] = clamp((x0+t3) >> 17); |
1449 | o[7] = clamp((x0-t3) >> 17); |
1450 | o[1] = clamp((x1+t2) >> 17); |
1451 | o[6] = clamp((x1-t2) >> 17); |
1452 | o[2] = clamp((x2+t1) >> 17); |
1453 | o[5] = clamp((x2-t1) >> 17); |
1454 | o[3] = clamp((x3+t0) >> 17); |
1455 | o[4] = clamp((x3-t0) >> 17); |
1456 | } |
1457 | } |
1458 | |
1459 | #ifdef STBI_SIMD |
1460 | static stbi_idct_8x8 stbi_idct_installed = idct_block; |
1461 | |
1462 | extern void stbi_install_idct(stbi_idct_8x8 func) |
1463 | { |
1464 | stbi_idct_installed = func; |
1465 | } |
1466 | #endif |
1467 | |
1468 | #define MARKER_none 0xff |
1469 | // if there's a pending marker from the entropy stream, return that |
1470 | // otherwise, fetch from the stream and get a marker. if there's no |
1471 | // marker, return 0xff, which is never a valid marker value |
1472 | static uint8 get_marker(jpeg *j) |
1473 | { |
1474 | uint8 x; |
1475 | if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; } |
1476 | x = get8u(&j->s); |
1477 | if (x != 0xff) return MARKER_none; |
1478 | while (x == 0xff) |
1479 | x = get8u(&j->s); |
1480 | return x; |
1481 | } |
1482 | |
1483 | // in each scan, we'll have scan_n components, and the order |
1484 | // of the components is specified by order[] |
1485 | #define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7) |
1486 | |
1487 | // after a restart interval, reset the entropy decoder and |
1488 | // the dc prediction |
1489 | static void reset(jpeg *j) |
1490 | { |
1491 | j->code_bits = 0; |
1492 | j->code_buffer = 0; |
1493 | j->nomore = 0; |
1494 | j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0; |
1495 | j->marker = MARKER_none; |
1496 | j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff; |
1497 | // no more than 1<<31 MCUs if no restart_interal? that's plenty safe, |
1498 | // since we don't even allow 1<<30 pixels |
1499 | } |
1500 | |
1501 | static int parse_entropy_coded_data(jpeg *z) |
1502 | { |
1503 | reset(z); |
1504 | if (z->scan_n == 1) { |
1505 | int i,j; |
1506 | #ifdef STBI_SIMD |
1507 | __declspec(align(16)) |
1508 | #endif |
1509 | short data[64]; |
1510 | int n = z->order[0]; |
1511 | // non-interleaved data, we just need to process one block at a time, |
1512 | // in trivial scanline order |
1513 | // number of blocks to do just depends on how many actual "pixels" this |
1514 | // component has, independent of interleaved MCU blocking and such |
1515 | int w = (z->img_comp[n].x+7) >> 3; |
1516 | int h = (z->img_comp[n].y+7) >> 3; |
1517 | for (j=0; j < h; ++j) { |
1518 | for (i=0; i < w; ++i) { |
1519 | if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0; |
1520 | #ifdef STBI_SIMD |
1521 | stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]); |
1522 | #else |
1523 | idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]); |
1524 | #endif |
1525 | // every data block is an MCU, so countdown the restart interval |
1526 | if (--z->todo <= 0) { |
1527 | if (z->code_bits < 24) grow_buffer_unsafe(z); |
1528 | // if it's NOT a restart, then just bail, so we get corrupt data |
1529 | // rather than no data |
1530 | if (!RESTART(z->marker)) return 1; |
1531 | reset(z); |
1532 | } |
1533 | } |
1534 | } |
1535 | } else { // interleaved! |
1536 | int i,j,k,x,y; |
1537 | short data[64]; |
1538 | for (j=0; j < z->img_mcu_y; ++j) { |
1539 | for (i=0; i < z->img_mcu_x; ++i) { |
1540 | // scan an interleaved mcu... process scan_n components in order |
1541 | for (k=0; k < z->scan_n; ++k) { |
1542 | int n = z->order[k]; |
1543 | // scan out an mcu's worth of this component; that's just determined |
1544 | // by the basic H and V specified for the component |
1545 | for (y=0; y < z->img_comp[n].v; ++y) { |
1546 | for (x=0; x < z->img_comp[n].h; ++x) { |
1547 | int x2 = (i*z->img_comp[n].h + x)*8; |
1548 | int y2 = (j*z->img_comp[n].v + y)*8; |
1549 | if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0; |
1550 | #ifdef STBI_SIMD |
1551 | stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]); |
1552 | #else |
1553 | idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]); |
1554 | #endif |
1555 | } |
1556 | } |
1557 | } |
1558 | // after all interleaved components, that's an interleaved MCU, |
1559 | // so now count down the restart interval |
1560 | if (--z->todo <= 0) { |
1561 | if (z->code_bits < 24) grow_buffer_unsafe(z); |
1562 | // if it's NOT a restart, then just bail, so we get corrupt data |
1563 | // rather than no data |
1564 | if (!RESTART(z->marker)) return 1; |
1565 | reset(z); |
1566 | } |
1567 | } |
1568 | } |
1569 | } |
1570 | return 1; |
1571 | } |
1572 | |
1573 | static int process_marker(jpeg *z, int marker) |
1574 | { |
1575 | int L; |
1576 | switch (marker) { |
1577 | case MARKER_none: // no marker found |
1578 | return e("expected marker" ,"Corrupt JPEG" ); |
1579 | |
1580 | case 0xC2: // SOF - progressive |
1581 | return e("progressive jpeg" ,"JPEG format not supported (progressive)" ); |
1582 | |
1583 | case 0xDD: // DRI - specify restart interval |
1584 | if (get16(&z->s) != 4) return e("bad DRI len" ,"Corrupt JPEG" ); |
1585 | z->restart_interval = get16(&z->s); |
1586 | return 1; |
1587 | |
1588 | case 0xDB: // DQT - define quantization table |
1589 | L = get16(&z->s)-2; |
1590 | while (L > 0) { |
1591 | int q = get8(&z->s); |
1592 | int p = q >> 4; |
1593 | int t = q & 15,i; |
1594 | if (p != 0) return e("bad DQT type" ,"Corrupt JPEG" ); |
1595 | if (t > 3) return e("bad DQT table" ,"Corrupt JPEG" ); |
1596 | for (i=0; i < 64; ++i) |
1597 | z->dequant[t][dezigzag[i]] = get8u(&z->s); |
1598 | #ifdef STBI_SIMD |
1599 | for (i=0; i < 64; ++i) |
1600 | z->dequant2[t][i] = z->dequant[t][i]; |
1601 | #endif |
1602 | L -= 65; |
1603 | } |
1604 | return L==0; |
1605 | |
1606 | case 0xC4: // DHT - define huffman table |
1607 | L = get16(&z->s)-2; |
1608 | while (L > 0) { |
1609 | uint8 *v; |
1610 | int sizes[16],i,m=0; |
1611 | int q = get8(&z->s); |
1612 | int tc = q >> 4; |
1613 | int th = q & 15; |
1614 | if (tc > 1 || th > 3) return e("bad DHT header" ,"Corrupt JPEG" ); |
1615 | for (i=0; i < 16; ++i) { |
1616 | sizes[i] = get8(&z->s); |
1617 | m += sizes[i]; |
1618 | } |
1619 | L -= 17; |
1620 | if (tc == 0) { |
1621 | if (!build_huffman(z->huff_dc+th, sizes)) return 0; |
1622 | v = z->huff_dc[th].values; |
1623 | } else { |
1624 | if (!build_huffman(z->huff_ac+th, sizes)) return 0; |
1625 | v = z->huff_ac[th].values; |
1626 | } |
1627 | for (i=0; i < m; ++i) |
1628 | v[i] = get8u(&z->s); |
1629 | L -= m; |
1630 | } |
1631 | return L==0; |
1632 | } |
1633 | // check for comment block or APP blocks |
1634 | if ((marker >= 0xE0 && marker <= 0xEF) || marker == 0xFE) { |
1635 | skip(&z->s, get16(&z->s)-2); |
1636 | return 1; |
1637 | } |
1638 | return 0; |
1639 | } |
1640 | |
1641 | // after we see SOS |
1642 | static int (jpeg *z) |
1643 | { |
1644 | int i; |
1645 | int Ls = get16(&z->s); |
1646 | z->scan_n = get8(&z->s); |
1647 | if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s.img_n) return e("bad SOS component count" ,"Corrupt JPEG" ); |
1648 | if (Ls != 6+2*z->scan_n) return e("bad SOS len" ,"Corrupt JPEG" ); |
1649 | for (i=0; i < z->scan_n; ++i) { |
1650 | int id = get8(&z->s), which; |
1651 | int q = get8(&z->s); |
1652 | for (which = 0; which < z->s.img_n; ++which) |
1653 | if (z->img_comp[which].id == id) |
1654 | break; |
1655 | if (which == z->s.img_n) return 0; |
1656 | z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return e("bad DC huff" ,"Corrupt JPEG" ); |
1657 | z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return e("bad AC huff" ,"Corrupt JPEG" ); |
1658 | z->order[i] = which; |
1659 | } |
1660 | if (get8(&z->s) != 0) return e("bad SOS" ,"Corrupt JPEG" ); |
1661 | get8(&z->s); // should be 63, but might be 0 |
1662 | if (get8(&z->s) != 0) return e("bad SOS" ,"Corrupt JPEG" ); |
1663 | |
1664 | return 1; |
1665 | } |
1666 | |
1667 | static int (jpeg *z, int scan) |
1668 | { |
1669 | stbi *s = &z->s; |
1670 | int Lf,p,i,q, h_max=1,v_max=1,c; |
1671 | Lf = get16(s); if (Lf < 11) return e("bad SOF len" ,"Corrupt JPEG" ); // JPEG |
1672 | p = get8(s); if (p != 8) return e("only 8-bit" ,"JPEG format not supported: 8-bit only" ); // JPEG baseline |
1673 | s->img_y = get16(s); if (s->img_y == 0) return e("no header height" , "JPEG format not supported: delayed height" ); // Legal, but we don't handle it--but neither does IJG |
1674 | s->img_x = get16(s); if (s->img_x == 0) return e("0 width" ,"Corrupt JPEG" ); // JPEG requires |
1675 | c = get8(s); |
1676 | if (c != 3 && c != 1) return e("bad component count" ,"Corrupt JPEG" ); // JFIF requires |
1677 | s->img_n = c; |
1678 | for (i=0; i < c; ++i) { |
1679 | z->img_comp[i].data = NULL; |
1680 | z->img_comp[i].linebuf = NULL; |
1681 | } |
1682 | |
1683 | if (Lf != 8+3*s->img_n) return e("bad SOF len" ,"Corrupt JPEG" ); |
1684 | |
1685 | for (i=0; i < s->img_n; ++i) { |
1686 | z->img_comp[i].id = get8(s); |
1687 | if (z->img_comp[i].id != i+1) // JFIF requires |
1688 | if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files! |
1689 | return e("bad component ID" ,"Corrupt JPEG" ); |
1690 | q = get8(s); |
1691 | z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H" ,"Corrupt JPEG" ); |
1692 | z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V" ,"Corrupt JPEG" ); |
1693 | z->img_comp[i].tq = get8(s); if (z->img_comp[i].tq > 3) return e("bad TQ" ,"Corrupt JPEG" ); |
1694 | } |
1695 | |
1696 | if (scan != SCAN_load) return 1; |
1697 | |
1698 | if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large" , "Image too large to decode" ); |
1699 | |
1700 | for (i=0; i < s->img_n; ++i) { |
1701 | if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h; |
1702 | if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v; |
1703 | } |
1704 | |
1705 | // compute interleaved mcu info |
1706 | z->img_h_max = h_max; |
1707 | z->img_v_max = v_max; |
1708 | z->img_mcu_w = h_max * 8; |
1709 | z->img_mcu_h = v_max * 8; |
1710 | z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w; |
1711 | z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h; |
1712 | |
1713 | for (i=0; i < s->img_n; ++i) { |
1714 | // number of effective pixels (e.g. for non-interleaved MCU) |
1715 | z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max; |
1716 | z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max; |
1717 | // to simplify generation, we'll allocate enough memory to decode |
1718 | // the bogus oversized data from using interleaved MCUs and their |
1719 | // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't |
1720 | // discard the extra data until colorspace conversion |
1721 | z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8; |
1722 | z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8; |
1723 | z->img_comp[i].raw_data = MALLOC(z->img_comp[i].w2 * z->img_comp[i].h2+15); |
1724 | if (z->img_comp[i].raw_data == NULL) { |
1725 | for(--i; i >= 0; --i) { |
1726 | FREE(z->img_comp[i].raw_data); |
1727 | z->img_comp[i].data = NULL; |
1728 | } |
1729 | return e("outofmem" , "Out of memory" ); |
1730 | } |
1731 | // align blocks for installable-idct using mmx/sse |
1732 | z->img_comp[i].data = (uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15); |
1733 | z->img_comp[i].linebuf = NULL; |
1734 | } |
1735 | |
1736 | return 1; |
1737 | } |
1738 | |
1739 | // use comparisons since in some cases we handle more than one case (e.g. SOF) |
1740 | #define DNL(x) ((x) == 0xdc) |
1741 | #define SOI(x) ((x) == 0xd8) |
1742 | #define EOI(x) ((x) == 0xd9) |
1743 | #define SOF(x) ((x) == 0xc0 || (x) == 0xc1) |
1744 | #define SOS(x) ((x) == 0xda) |
1745 | |
1746 | static int (jpeg *z, int scan) |
1747 | { |
1748 | int m; |
1749 | z->marker = MARKER_none; // initialize cached marker to empty |
1750 | m = get_marker(z); |
1751 | if (!SOI(m)) return e("no SOI" ,"Corrupt JPEG" ); |
1752 | if (scan == SCAN_type) return 1; |
1753 | m = get_marker(z); |
1754 | while (!SOF(m)) { |
1755 | if (!process_marker(z,m)) return 0; |
1756 | m = get_marker(z); |
1757 | while (m == MARKER_none) { |
1758 | // some files have extra padding after their blocks, so ok, we'll scan |
1759 | if (at_eof(&z->s)) return e("no SOF" , "Corrupt JPEG" ); |
1760 | m = get_marker(z); |
1761 | } |
1762 | } |
1763 | if (!process_frame_header(z, scan)) return 0; |
1764 | return 1; |
1765 | } |
1766 | |
1767 | static int decode_jpeg_image(jpeg *j) |
1768 | { |
1769 | int m; |
1770 | j->restart_interval = 0; |
1771 | if (!decode_jpeg_header(j, SCAN_load)) return 0; |
1772 | m = get_marker(j); |
1773 | while (!EOI(m)) { |
1774 | if (SOS(m)) { |
1775 | if (!process_scan_header(j)) return 0; |
1776 | if (!parse_entropy_coded_data(j)) return 0; |
1777 | if (j->marker == MARKER_none ) { |
1778 | // handle 0s at the end of image data from IP Kamera 9060 |
1779 | while (!at_eof(&j->s)) { |
1780 | int x = get8(&j->s); |
1781 | if (x == 255) { |
1782 | j->marker = get8u(&j->s); |
1783 | break; |
1784 | } else if (x != 0) { |
1785 | return 0; |
1786 | } |
1787 | } |
1788 | // if we reach eof without hitting a marker, get_marker() below will fail and we'll eventually return 0 |
1789 | } |
1790 | } else { |
1791 | if (!process_marker(j, m)) return 0; |
1792 | } |
1793 | m = get_marker(j); |
1794 | } |
1795 | return 1; |
1796 | } |
1797 | |
1798 | // static jfif-centered resampling (across block boundaries) |
1799 | |
1800 | typedef uint8 *(*resample_row_func)(uint8 *out, uint8 *in0, uint8 *in1, |
1801 | int w, int hs); |
1802 | |
1803 | #define div4(x) ((uint8) ((x) >> 2)) |
1804 | |
1805 | static uint8 *resample_row_1(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) |
1806 | { |
1807 | STBI_NOTUSED(out); |
1808 | STBI_NOTUSED(in_far); |
1809 | STBI_NOTUSED(w); |
1810 | STBI_NOTUSED(hs); |
1811 | return in_near; |
1812 | } |
1813 | |
1814 | static uint8* resample_row_v_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) |
1815 | { |
1816 | // need to generate two samples vertically for every one in input |
1817 | int i; |
1818 | STBI_NOTUSED(hs); |
1819 | for (i=0; i < w; ++i) |
1820 | out[i] = div4(3*in_near[i] + in_far[i] + 2); |
1821 | return out; |
1822 | } |
1823 | |
1824 | static uint8* resample_row_h_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) |
1825 | { |
1826 | // need to generate two samples horizontally for every one in input |
1827 | int i; |
1828 | uint8 *input = in_near; |
1829 | |
1830 | if (w == 1) { |
1831 | // if only one sample, can't do any interpolation |
1832 | out[0] = out[1] = input[0]; |
1833 | return out; |
1834 | } |
1835 | |
1836 | out[0] = input[0]; |
1837 | out[1] = div4(input[0]*3 + input[1] + 2); |
1838 | for (i=1; i < w-1; ++i) { |
1839 | int n = 3*input[i]+2; |
1840 | out[i*2+0] = div4(n+input[i-1]); |
1841 | out[i*2+1] = div4(n+input[i+1]); |
1842 | } |
1843 | out[i*2+0] = div4(input[w-2]*3 + input[w-1] + 2); |
1844 | out[i*2+1] = input[w-1]; |
1845 | |
1846 | STBI_NOTUSED(in_far); |
1847 | STBI_NOTUSED(hs); |
1848 | |
1849 | return out; |
1850 | } |
1851 | |
1852 | #define div16(x) ((uint8) ((x) >> 4)) |
1853 | |
1854 | static uint8 *resample_row_hv_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) |
1855 | { |
1856 | // need to generate 2x2 samples for every one in input |
1857 | int i,t0,t1; |
1858 | if (w == 1) { |
1859 | out[0] = out[1] = div4(3*in_near[0] + in_far[0] + 2); |
1860 | return out; |
1861 | } |
1862 | |
1863 | t1 = 3*in_near[0] + in_far[0]; |
1864 | out[0] = div4(t1+2); |
1865 | for (i=1; i < w; ++i) { |
1866 | t0 = t1; |
1867 | t1 = 3*in_near[i]+in_far[i]; |
1868 | out[i*2-1] = div16(3*t0 + t1 + 8); |
1869 | out[i*2 ] = div16(3*t1 + t0 + 8); |
1870 | } |
1871 | out[w*2-1] = div4(t1+2); |
1872 | |
1873 | STBI_NOTUSED(hs); |
1874 | |
1875 | return out; |
1876 | } |
1877 | |
1878 | static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs) |
1879 | { |
1880 | // resample with nearest-neighbor |
1881 | int i,j; |
1882 | in_far = in_far; |
1883 | for (i=0; i < w; ++i) |
1884 | for (j=0; j < hs; ++j) |
1885 | out[i*hs+j] = in_near[i]; |
1886 | return out; |
1887 | } |
1888 | |
1889 | #define float2fixed(x) ((int) ((x) * 65536 + 0.5)) |
1890 | |
1891 | // 0.38 seconds on 3*anemones.jpg (0.25 with processor = Pro) |
1892 | // VC6 without processor=Pro is generating multiple LEAs per multiply! |
1893 | static void YCbCr_to_RGB_row(uint8 *out, const uint8 *y, const uint8 *pcb, const uint8 *pcr, int count, int step) |
1894 | { |
1895 | int i; |
1896 | for (i=0; i < count; ++i) { |
1897 | int y_fixed = (y[i] << 16) + 32768; // rounding |
1898 | int r,g,b; |
1899 | int cr = pcr[i] - 128; |
1900 | int cb = pcb[i] - 128; |
1901 | r = y_fixed + cr*float2fixed(1.40200f); |
1902 | g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f); |
1903 | b = y_fixed + cb*float2fixed(1.77200f); |
1904 | r >>= 16; |
1905 | g >>= 16; |
1906 | b >>= 16; |
1907 | if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; } |
1908 | if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; } |
1909 | if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; } |
1910 | out[0] = (uint8)r; |
1911 | out[1] = (uint8)g; |
1912 | out[2] = (uint8)b; |
1913 | out[3] = 255; |
1914 | out += step; |
1915 | } |
1916 | } |
1917 | |
1918 | #ifdef STBI_SIMD |
1919 | static stbi_YCbCr_to_RGB_run stbi_YCbCr_installed = YCbCr_to_RGB_row; |
1920 | |
1921 | void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func) |
1922 | { |
1923 | stbi_YCbCr_installed = func; |
1924 | } |
1925 | #endif |
1926 | |
1927 | |
1928 | // clean up the temporary component buffers |
1929 | static void cleanup_jpeg(jpeg *j) |
1930 | { |
1931 | int i; |
1932 | for (i=0; i < j->s.img_n; ++i) { |
1933 | if (j->img_comp[i].data) { |
1934 | FREE(j->img_comp[i].raw_data); |
1935 | j->img_comp[i].data = NULL; |
1936 | } |
1937 | if (j->img_comp[i].linebuf) { |
1938 | FREE(j->img_comp[i].linebuf); |
1939 | j->img_comp[i].linebuf = NULL; |
1940 | } |
1941 | } |
1942 | } |
1943 | |
1944 | typedef struct |
1945 | { |
1946 | resample_row_func resample; |
1947 | uint8 *line0,*line1; |
1948 | int hs,vs; // expansion factor in each axis |
1949 | int w_lores; // horizontal pixels pre-expansion |
1950 | int ystep; // how far through vertical expansion we are |
1951 | int ypos; // which pre-expansion row we're on |
1952 | } stbi_resample; |
1953 | |
1954 | static uint8 *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp) |
1955 | { |
1956 | int n, decode_n; |
1957 | // validate req_comp |
1958 | if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp" , "Internal error" ); |
1959 | z->s.img_n = 0; |
1960 | |
1961 | // load a jpeg image from whichever source |
1962 | if (!decode_jpeg_image(z)) { cleanup_jpeg(z); return NULL; } |
1963 | |
1964 | // determine actual number of components to generate |
1965 | n = req_comp ? req_comp : z->s.img_n; |
1966 | |
1967 | if (z->s.img_n == 3 && n < 3) |
1968 | decode_n = 1; |
1969 | else |
1970 | decode_n = z->s.img_n; |
1971 | |
1972 | // resample and color-convert |
1973 | { |
1974 | int k; |
1975 | uint i,j; |
1976 | uint8 *output; |
1977 | uint8 *coutput[4]; |
1978 | |
1979 | stbi_resample res_comp[4]; |
1980 | |
1981 | for (k=0; k < decode_n; ++k) { |
1982 | stbi_resample *r = &res_comp[k]; |
1983 | |
1984 | // allocate line buffer big enough for upsampling off the edges |
1985 | // with upsample factor of 4 |
1986 | z->img_comp[k].linebuf = MALLOC(z->s.img_x + 3); |
1987 | if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("outofmem" , "Out of memory" ); } |
1988 | |
1989 | r->hs = z->img_h_max / z->img_comp[k].h; |
1990 | r->vs = z->img_v_max / z->img_comp[k].v; |
1991 | r->ystep = r->vs >> 1; |
1992 | r->w_lores = (z->s.img_x + r->hs-1) / r->hs; |
1993 | r->ypos = 0; |
1994 | r->line0 = r->line1 = z->img_comp[k].data; |
1995 | |
1996 | if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1; |
1997 | else if (r->hs == 1 && r->vs == 2) r->resample = resample_row_v_2; |
1998 | else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2; |
1999 | else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2; |
2000 | else r->resample = resample_row_generic; |
2001 | } |
2002 | |
2003 | // can't error after this so, this is safe |
2004 | output = MALLOC(n * z->s.img_x * z->s.img_y + 1); |
2005 | if (!output) { cleanup_jpeg(z); return epuc("outofmem" , "Out of memory" ); } |
2006 | |
2007 | // now go ahead and resample |
2008 | for (j=0; j < z->s.img_y; ++j) { |
2009 | uint8 *out = output + n * z->s.img_x * j; |
2010 | for (k=0; k < decode_n; ++k) { |
2011 | stbi_resample *r = &res_comp[k]; |
2012 | int y_bot = r->ystep >= (r->vs >> 1); |
2013 | coutput[k] = r->resample(z->img_comp[k].linebuf, |
2014 | y_bot ? r->line1 : r->line0, |
2015 | y_bot ? r->line0 : r->line1, |
2016 | r->w_lores, r->hs); |
2017 | if (++r->ystep >= r->vs) { |
2018 | r->ystep = 0; |
2019 | r->line0 = r->line1; |
2020 | if (++r->ypos < z->img_comp[k].y) |
2021 | r->line1 += z->img_comp[k].w2; |
2022 | } |
2023 | } |
2024 | if (n >= 3) { |
2025 | uint8 *y = coutput[0]; |
2026 | if (z->s.img_n == 3) { |
2027 | #ifdef STBI_SIMD |
2028 | stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n); |
2029 | #else |
2030 | YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s.img_x, n); |
2031 | #endif |
2032 | } else |
2033 | for (i=0; i < z->s.img_x; ++i) { |
2034 | out[0] = out[1] = out[2] = y[i]; |
2035 | out[3] = 255; // not used if n==3 |
2036 | out += n; |
2037 | } |
2038 | } else { |
2039 | uint8 *y = coutput[0]; |
2040 | if (n == 1) |
2041 | for (i=0; i < z->s.img_x; ++i) out[i] = y[i]; |
2042 | else |
2043 | for (i=0; i < z->s.img_x; ++i) *out++ = y[i], *out++ = 255; |
2044 | } |
2045 | } |
2046 | cleanup_jpeg(z); |
2047 | *out_x = z->s.img_x; |
2048 | *out_y = z->s.img_y; |
2049 | if (comp) *comp = z->s.img_n; // report original components, not output |
2050 | return output; |
2051 | } |
2052 | } |
2053 | |
2054 | #ifndef STBI_NO_STDIO |
2055 | unsigned char *stbi_jpeg_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
2056 | { |
2057 | jpeg j; |
2058 | start_file(&j.s, f); |
2059 | return load_jpeg_image(&j, x,y,comp,req_comp); |
2060 | } |
2061 | |
2062 | unsigned char *stbi_jpeg_load(char const *filename, int *x, int *y, int *comp, int req_comp) |
2063 | { |
2064 | unsigned char *data; |
2065 | FILE *f = fopen(filename, "rb" ); |
2066 | if (!f) return NULL; |
2067 | data = stbi_jpeg_load_from_file(f,x,y,comp,req_comp); |
2068 | fclose(f); |
2069 | return data; |
2070 | } |
2071 | #endif |
2072 | |
2073 | unsigned char *stbi_jpeg_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
2074 | { |
2075 | #ifdef STBI_SMALL_STACK |
2076 | unsigned char *result; |
2077 | jpeg *j = MALLOC(sizeof(*j)); |
2078 | start_mem(&j->s, buffer, len); |
2079 | result = load_jpeg_image(j,x,y,comp,req_comp); |
2080 | FREE(j); |
2081 | return result; |
2082 | #else |
2083 | jpeg j; |
2084 | start_mem(&j.s, buffer,len); |
2085 | return load_jpeg_image(&j, x,y,comp,req_comp); |
2086 | #endif |
2087 | } |
2088 | |
2089 | static int stbi_jpeg_info_raw(jpeg *j, int *x, int *y, int *comp) |
2090 | { |
2091 | if (!decode_jpeg_header(j, SCAN_header)) |
2092 | return 0; |
2093 | if (x) *x = j->s.img_x; |
2094 | if (y) *y = j->s.img_y; |
2095 | if (comp) *comp = j->s.img_n; |
2096 | return 1; |
2097 | } |
2098 | |
2099 | #ifndef STBI_NO_STDIO |
2100 | int stbi_jpeg_test_file(FILE *f) |
2101 | { |
2102 | int n,r; |
2103 | jpeg j; |
2104 | n = ftell(f); |
2105 | start_file(&j.s, f); |
2106 | r = decode_jpeg_header(&j, SCAN_type); |
2107 | fseek(f,n,SEEK_SET); |
2108 | return r; |
2109 | } |
2110 | |
2111 | int stbi_jpeg_info_from_file(FILE *f, int *x, int *y, int *comp) |
2112 | { |
2113 | jpeg j; |
2114 | long n = ftell(f); |
2115 | int res; |
2116 | start_file(&j.s, f); |
2117 | res = stbi_jpeg_info_raw(&j, x, y, comp); |
2118 | fseek(f, n, SEEK_SET); |
2119 | return res; |
2120 | } |
2121 | |
2122 | int stbi_jpeg_info(char const *filename, int *x, int *y, int *comp) |
2123 | { |
2124 | FILE *f = fopen(filename, "rb" ); |
2125 | int result; |
2126 | if (!f) return e("can't fopen" , "Unable to open file" ); |
2127 | result = stbi_jpeg_info_from_file(f, x, y, comp); |
2128 | fclose(f); |
2129 | return result; |
2130 | } |
2131 | #endif |
2132 | |
2133 | int stbi_jpeg_test_memory(stbi_uc const *buffer, int len) |
2134 | { |
2135 | jpeg j; |
2136 | start_mem(&j.s, buffer,len); |
2137 | return decode_jpeg_header(&j, SCAN_type); |
2138 | } |
2139 | |
2140 | int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) |
2141 | { |
2142 | jpeg j; |
2143 | start_mem(&j.s, buffer, len); |
2144 | return stbi_jpeg_info_raw(&j, x, y, comp); |
2145 | } |
2146 | |
2147 | #ifndef STBI_NO_STDIO |
2148 | extern int stbi_jpeg_info (char const *filename, int *x, int *y, int *comp); |
2149 | extern int stbi_jpeg_info_from_file (FILE *f, int *x, int *y, int *comp); |
2150 | #endif |
2151 | extern int stbi_jpeg_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp); |
2152 | |
2153 | // public domain zlib decode v0.2 Sean Barrett 2006-11-18 |
2154 | // simple implementation |
2155 | // - all input must be provided in an upfront buffer |
2156 | // - all output is written to a single output buffer (can malloc/realloc) |
2157 | // performance |
2158 | // - fast huffman |
2159 | |
2160 | // fast-way is faster to check than jpeg huffman, but slow way is slower |
2161 | #define ZFAST_BITS 9 // accelerate all cases in default tables |
2162 | #define ZFAST_MASK ((1 << ZFAST_BITS) - 1) |
2163 | |
2164 | // zlib-style huffman encoding |
2165 | // (jpegs packs from left, zlib from right, so can't share code) |
2166 | typedef struct |
2167 | { |
2168 | uint16 fast[1 << ZFAST_BITS]; |
2169 | uint16 firstcode[16]; |
2170 | int maxcode[17]; |
2171 | uint16 firstsymbol[16]; |
2172 | uint8 size[288]; |
2173 | uint16 value[288]; |
2174 | } zhuffman; |
2175 | |
2176 | __forceinline static int bitreverse16(int n) |
2177 | { |
2178 | n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1); |
2179 | n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2); |
2180 | n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4); |
2181 | n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8); |
2182 | return n; |
2183 | } |
2184 | |
2185 | __forceinline static int bit_reverse(int v, int bits) |
2186 | { |
2187 | assert(bits <= 16); |
2188 | // to bit reverse n bits, reverse 16 and shift |
2189 | // e.g. 11 bits, bit reverse and shift away 5 |
2190 | return bitreverse16(v) >> (16-bits); |
2191 | } |
2192 | |
2193 | static int zbuild_huffman(zhuffman *z, uint8 *sizelist, int num) |
2194 | { |
2195 | int i,k=0; |
2196 | int code, next_code[16], sizes[17]; |
2197 | |
2198 | // DEFLATE spec for generating codes |
2199 | memset(sizes, 0, sizeof(sizes)); |
2200 | memset(z->fast, 255, sizeof(z->fast)); |
2201 | for (i=0; i < num; ++i) |
2202 | ++sizes[sizelist[i]]; |
2203 | sizes[0] = 0; |
2204 | for (i=1; i < 16; ++i) |
2205 | assert(sizes[i] <= (1 << i)); |
2206 | code = 0; |
2207 | for (i=1; i < 16; ++i) { |
2208 | next_code[i] = code; |
2209 | z->firstcode[i] = (uint16) code; |
2210 | z->firstsymbol[i] = (uint16) k; |
2211 | code = (code + sizes[i]); |
2212 | if (sizes[i]) |
2213 | if (code-1 >= (1 << i)) return e("bad codelengths" ,"Corrupt JPEG" ); |
2214 | z->maxcode[i] = code << (16-i); // preshift for inner loop |
2215 | code <<= 1; |
2216 | k += sizes[i]; |
2217 | } |
2218 | z->maxcode[16] = 0x10000; // sentinel |
2219 | for (i=0; i < num; ++i) { |
2220 | int s = sizelist[i]; |
2221 | if (s) { |
2222 | int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s]; |
2223 | z->size[c] = (uint8)s; |
2224 | z->value[c] = (uint16)i; |
2225 | if (s <= ZFAST_BITS) { |
2226 | int m = bit_reverse(next_code[s],s); |
2227 | while (m < (1 << ZFAST_BITS)) { |
2228 | z->fast[m] = (uint16) c; |
2229 | m += (1 << s); |
2230 | } |
2231 | } |
2232 | ++next_code[s]; |
2233 | } |
2234 | } |
2235 | return 1; |
2236 | } |
2237 | |
2238 | // zlib-from-memory implementation for PNG reading |
2239 | // because PNG allows splitting the zlib stream arbitrarily, |
2240 | // and it's annoying structurally to have PNG call ZLIB call PNG, |
2241 | // we require PNG read all the IDATs and combine them into a single |
2242 | // memory buffer |
2243 | |
2244 | typedef struct |
2245 | { |
2246 | uint8 const *zbuffer, *zbuffer_end; |
2247 | int num_bits; |
2248 | uint32 code_buffer; |
2249 | |
2250 | char *zout; |
2251 | char *zout_start; |
2252 | char *zout_end; |
2253 | int z_expandable; |
2254 | |
2255 | zhuffman z_length, z_distance; |
2256 | } zbuf; |
2257 | |
2258 | __forceinline static int zget8(zbuf *z) |
2259 | { |
2260 | if (z->zbuffer >= z->zbuffer_end) return 0; |
2261 | return *z->zbuffer++; |
2262 | } |
2263 | |
2264 | static void fill_bits(zbuf *z) |
2265 | { |
2266 | do { |
2267 | assert(z->code_buffer < (1U << z->num_bits)); |
2268 | z->code_buffer |= zget8(z) << z->num_bits; |
2269 | z->num_bits += 8; |
2270 | } while (z->num_bits <= 24); |
2271 | } |
2272 | |
2273 | __forceinline static unsigned int zreceive(zbuf *z, int n) |
2274 | { |
2275 | unsigned int k; |
2276 | if (z->num_bits < n) fill_bits(z); |
2277 | k = z->code_buffer & ((1 << n) - 1); |
2278 | z->code_buffer >>= n; |
2279 | z->num_bits -= n; |
2280 | return k; |
2281 | } |
2282 | |
2283 | __forceinline static int zhuffman_decode(zbuf *a, zhuffman *z) |
2284 | { |
2285 | int b,s,k; |
2286 | if (a->num_bits < 16) fill_bits(a); |
2287 | b = z->fast[a->code_buffer & ZFAST_MASK]; |
2288 | if (b < 0xffff) { |
2289 | s = z->size[b]; |
2290 | a->code_buffer >>= s; |
2291 | a->num_bits -= s; |
2292 | return z->value[b]; |
2293 | } |
2294 | |
2295 | // not resolved by fast table, so compute it the slow way |
2296 | // use jpeg approach, which requires MSbits at top |
2297 | k = bit_reverse(a->code_buffer, 16); |
2298 | for (s=ZFAST_BITS+1; ; ++s) |
2299 | if (k < z->maxcode[s]) |
2300 | break; |
2301 | if (s == 16) return -1; // invalid code! |
2302 | // code size is s, so: |
2303 | b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s]; |
2304 | assert(z->size[b] == s); |
2305 | a->code_buffer >>= s; |
2306 | a->num_bits -= s; |
2307 | return z->value[b]; |
2308 | } |
2309 | |
2310 | static int expand(zbuf *z, int n) // need to make room for n bytes |
2311 | { |
2312 | char *q; |
2313 | int cur, limit; |
2314 | if (!z->z_expandable) return e("output buffer limit" ,"Corrupt PNG" ); |
2315 | cur = (int) (z->zout - z->zout_start); |
2316 | limit = (int) (z->zout_end - z->zout_start); |
2317 | while (cur + n > limit) |
2318 | limit *= 2; |
2319 | q = (char *) REALLOC(z->zout_start, limit); |
2320 | if (q == NULL) return e("outofmem" , "Out of memory" ); |
2321 | z->zout_start = q; |
2322 | z->zout = q + cur; |
2323 | z->zout_end = q + limit; |
2324 | return 1; |
2325 | } |
2326 | |
2327 | static int length_base[31] = { |
2328 | 3,4,5,6,7,8,9,10,11,13, |
2329 | 15,17,19,23,27,31,35,43,51,59, |
2330 | 67,83,99,115,131,163,195,227,258,0,0 }; |
2331 | |
2332 | static int [31]= |
2333 | { 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 }; |
2334 | |
2335 | static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193, |
2336 | 257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0}; |
2337 | |
2338 | static int [32] = |
2339 | { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13}; |
2340 | |
2341 | static int parse_huffman_block(zbuf *a) |
2342 | { |
2343 | for(;;) { |
2344 | int z = zhuffman_decode(a, &a->z_length); |
2345 | if (z < 256) { |
2346 | if (z < 0) return e("bad huffman code" ,"Corrupt PNG" ); // error in huffman codes |
2347 | if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0; |
2348 | *a->zout++ = (char) z; |
2349 | } else { |
2350 | uint8 *p; |
2351 | int len,dist; |
2352 | if (z == 256) return 1; |
2353 | z -= 257; |
2354 | len = length_base[z]; |
2355 | if (length_extra[z]) len += zreceive(a, length_extra[z]); |
2356 | z = zhuffman_decode(a, &a->z_distance); |
2357 | if (z < 0) return e("bad huffman code" ,"Corrupt PNG" ); |
2358 | dist = dist_base[z]; |
2359 | if (dist_extra[z]) dist += zreceive(a, dist_extra[z]); |
2360 | if (a->zout - a->zout_start < dist) return e("bad dist" ,"Corrupt PNG" ); |
2361 | if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0; |
2362 | p = (uint8 *) (a->zout - dist); |
2363 | while (len--) |
2364 | *a->zout++ = *p++; |
2365 | } |
2366 | } |
2367 | } |
2368 | |
2369 | static int compute_huffman_codes(zbuf *a) |
2370 | { |
2371 | static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 }; |
2372 | zhuffman z_codelength; |
2373 | uint8 lencodes[286+32+137];//padding for maximum single op |
2374 | uint8 codelength_sizes[19]; |
2375 | int i,n; |
2376 | |
2377 | int hlit = zreceive(a,5) + 257; |
2378 | int hdist = zreceive(a,5) + 1; |
2379 | int hclen = zreceive(a,4) + 4; |
2380 | |
2381 | memset(codelength_sizes, 0, sizeof(codelength_sizes)); |
2382 | for (i=0; i < hclen; ++i) { |
2383 | int s = zreceive(a,3); |
2384 | codelength_sizes[length_dezigzag[i]] = (uint8) s; |
2385 | } |
2386 | if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0; |
2387 | |
2388 | n = 0; |
2389 | while (n < hlit + hdist) { |
2390 | int c = zhuffman_decode(a, &z_codelength); |
2391 | assert(c >= 0 && c < 19); |
2392 | if (c < 16) |
2393 | lencodes[n++] = (uint8) c; |
2394 | else if (c == 16) { |
2395 | c = zreceive(a,2)+3; |
2396 | memset(lencodes+n, lencodes[n-1], c); |
2397 | n += c; |
2398 | } else if (c == 17) { |
2399 | c = zreceive(a,3)+3; |
2400 | memset(lencodes+n, 0, c); |
2401 | n += c; |
2402 | } else { |
2403 | assert(c == 18); |
2404 | c = zreceive(a,7)+11; |
2405 | memset(lencodes+n, 0, c); |
2406 | n += c; |
2407 | } |
2408 | } |
2409 | if (n != hlit+hdist) return e("bad codelengths" ,"Corrupt PNG" ); |
2410 | if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0; |
2411 | if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0; |
2412 | return 1; |
2413 | } |
2414 | |
2415 | static int parse_uncompressed_block(zbuf *a) |
2416 | { |
2417 | uint8 [4]; |
2418 | int len,nlen,k; |
2419 | if (a->num_bits & 7) |
2420 | zreceive(a, a->num_bits & 7); // discard |
2421 | // drain the bit-packed data into header |
2422 | k = 0; |
2423 | while (a->num_bits > 0) { |
2424 | header[k++] = (uint8) (a->code_buffer & 255); // wtf this warns? |
2425 | a->code_buffer >>= 8; |
2426 | a->num_bits -= 8; |
2427 | } |
2428 | assert(a->num_bits == 0); |
2429 | // now fill header the normal way |
2430 | while (k < 4) |
2431 | header[k++] = (uint8) zget8(a); |
2432 | len = header[1] * 256 + header[0]; |
2433 | nlen = header[3] * 256 + header[2]; |
2434 | if (nlen != (len ^ 0xffff)) return e("zlib corrupt" ,"Corrupt PNG" ); |
2435 | if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer" ,"Corrupt PNG" ); |
2436 | if (a->zout + len > a->zout_end) |
2437 | if (!expand(a, len)) return 0; |
2438 | memcpy(a->zout, a->zbuffer, len); |
2439 | a->zbuffer += len; |
2440 | a->zout += len; |
2441 | return 1; |
2442 | } |
2443 | |
2444 | static int (zbuf *a) |
2445 | { |
2446 | int cmf = zget8(a); |
2447 | int cm = cmf & 15; |
2448 | /* int cinfo = cmf >> 4; */ |
2449 | int flg = zget8(a); |
2450 | if ((cmf*256+flg) % 31 != 0) return e("bad zlib header" ,"Corrupt PNG" ); // zlib spec |
2451 | if (flg & 32) return e("no preset dict" ,"Corrupt PNG" ); // preset dictionary not allowed in png |
2452 | if (cm != 8) return e("bad compression" ,"Corrupt PNG" ); // DEFLATE required for png |
2453 | // window = 1 << (8 + cinfo)... but who cares, we fully buffer output |
2454 | return 1; |
2455 | } |
2456 | |
2457 | // @TODO: should statically initialize these for optimal thread safety |
2458 | static uint8 default_length[288], default_distance[32]; |
2459 | static void init_defaults(void) |
2460 | { |
2461 | int i; // use <= to match clearly with spec |
2462 | for (i=0; i <= 143; ++i) default_length[i] = 8; |
2463 | for ( ; i <= 255; ++i) default_length[i] = 9; |
2464 | for ( ; i <= 279; ++i) default_length[i] = 7; |
2465 | for ( ; i <= 287; ++i) default_length[i] = 8; |
2466 | |
2467 | for (i=0; i <= 31; ++i) default_distance[i] = 5; |
2468 | } |
2469 | |
2470 | int stbi_png_partial; // a quick hack to only allow decoding some of a PNG... I should implement real streaming support instead |
2471 | static int parse_zlib(zbuf *a, int ) |
2472 | { |
2473 | int final, type; |
2474 | if (parse_header) |
2475 | if (!parse_zlib_header(a)) return 0; |
2476 | a->num_bits = 0; |
2477 | a->code_buffer = 0; |
2478 | do { |
2479 | final = zreceive(a,1); |
2480 | type = zreceive(a,2); |
2481 | if (type == 0) { |
2482 | if (!parse_uncompressed_block(a)) return 0; |
2483 | } else if (type == 3) { |
2484 | return 0; |
2485 | } else { |
2486 | if (type == 1) { |
2487 | // use fixed code lengths |
2488 | if (!default_distance[31]) init_defaults(); |
2489 | if (!zbuild_huffman(&a->z_length , default_length , 288)) return 0; |
2490 | if (!zbuild_huffman(&a->z_distance, default_distance, 32)) return 0; |
2491 | } else { |
2492 | if (!compute_huffman_codes(a)) return 0; |
2493 | } |
2494 | if (!parse_huffman_block(a)) return 0; |
2495 | } |
2496 | if (stbi_png_partial && a->zout - a->zout_start > 65536) |
2497 | break; |
2498 | } while (!final); |
2499 | return 1; |
2500 | } |
2501 | |
2502 | static int do_zlib(zbuf *a, char *obuf, int olen, int exp, int ) |
2503 | { |
2504 | a->zout_start = obuf; |
2505 | a->zout = obuf; |
2506 | a->zout_end = obuf + olen; |
2507 | a->z_expandable = exp; |
2508 | |
2509 | return parse_zlib(a, parse_header); |
2510 | } |
2511 | |
2512 | char *stbi_zlib_decode_malloc_guesssize(const char * buffer, int len, int initial_size, int *outlen) |
2513 | { |
2514 | zbuf a; |
2515 | char *p = MALLOC(initial_size); |
2516 | if (p == NULL) return NULL; |
2517 | a.zbuffer = (uint8 const *) buffer; |
2518 | a.zbuffer_end = (uint8 const *) buffer + len; |
2519 | if (do_zlib(&a, p, initial_size, 1, 1)) { |
2520 | if (outlen) *outlen = (int) (a.zout - a.zout_start); |
2521 | return a.zout_start; |
2522 | } else { |
2523 | FREE(a.zout_start); |
2524 | return NULL; |
2525 | } |
2526 | } |
2527 | |
2528 | char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen) |
2529 | { |
2530 | return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen); |
2531 | } |
2532 | |
2533 | char *(const char *buffer, int len, int initial_size, int *outlen, int ) |
2534 | { |
2535 | zbuf a; |
2536 | char *p = MALLOC(initial_size); |
2537 | if (p == NULL) return NULL; |
2538 | a.zbuffer = (uint8 const *) buffer; |
2539 | a.zbuffer_end = (uint8 const *) buffer + len; |
2540 | if (do_zlib(&a, p, initial_size, 1, parse_header)) { |
2541 | if (outlen) *outlen = (int) (a.zout - a.zout_start); |
2542 | return a.zout_start; |
2543 | } else { |
2544 | FREE(a.zout_start); |
2545 | return NULL; |
2546 | } |
2547 | } |
2548 | |
2549 | int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen) |
2550 | { |
2551 | zbuf a; |
2552 | a.zbuffer = (uint8 const *) ibuffer; |
2553 | a.zbuffer_end = (uint8 const *) ibuffer + ilen; |
2554 | if (do_zlib(&a, obuffer, olen, 0, 1)) |
2555 | return (int) (a.zout - a.zout_start); |
2556 | else |
2557 | return -1; |
2558 | } |
2559 | |
2560 | char *(char const *buffer, int len, int *outlen) |
2561 | { |
2562 | zbuf a; |
2563 | char *p = MALLOC(16384); |
2564 | if (p == NULL) return NULL; |
2565 | a.zbuffer = (uint8 const *) buffer; |
2566 | a.zbuffer_end = (uint8 const *) buffer+len; |
2567 | if (do_zlib(&a, p, 16384, 1, 0)) { |
2568 | if (outlen) *outlen = (int) (a.zout - a.zout_start); |
2569 | return a.zout_start; |
2570 | } else { |
2571 | FREE(a.zout_start); |
2572 | return NULL; |
2573 | } |
2574 | } |
2575 | |
2576 | int (char *obuffer, int olen, const char *ibuffer, int ilen) |
2577 | { |
2578 | zbuf a; |
2579 | a.zbuffer = (uint8 const *) ibuffer; |
2580 | a.zbuffer_end = (uint8 const *) ibuffer + ilen; |
2581 | if (do_zlib(&a, obuffer, olen, 0, 0)) |
2582 | return (int) (a.zout - a.zout_start); |
2583 | else |
2584 | return -1; |
2585 | } |
2586 | |
2587 | // public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18 |
2588 | // simple implementation |
2589 | // - only 8-bit samples |
2590 | // - no CRC checking |
2591 | // - allocates lots of intermediate memory |
2592 | // - avoids problem of streaming data between subsystems |
2593 | // - avoids explicit window management |
2594 | // performance |
2595 | // - uses stb_zlib, a PD zlib implementation with fast huffman decoding |
2596 | |
2597 | |
2598 | typedef struct |
2599 | { |
2600 | uint32 length; |
2601 | uint32 type; |
2602 | } chunk; |
2603 | |
2604 | #define PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d)) |
2605 | |
2606 | static chunk (stbi *s) |
2607 | { |
2608 | chunk c; |
2609 | c.length = get32(s); |
2610 | c.type = get32(s); |
2611 | return c; |
2612 | } |
2613 | |
2614 | static int (stbi *s) |
2615 | { |
2616 | static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 }; |
2617 | int i; |
2618 | for (i=0; i < 8; ++i) |
2619 | if (get8(s) != png_sig[i]) return e("bad png sig" ,"Not a PNG" ); |
2620 | return 1; |
2621 | } |
2622 | |
2623 | typedef struct |
2624 | { |
2625 | stbi s; |
2626 | uint8 *idata, *expanded, *out; |
2627 | } png; |
2628 | |
2629 | |
2630 | enum { |
2631 | F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4, |
2632 | F_avg_first, F_paeth_first |
2633 | }; |
2634 | |
2635 | static uint8 first_row_filter[5] = |
2636 | { |
2637 | F_none, F_sub, F_none, F_avg_first, F_paeth_first |
2638 | }; |
2639 | |
2640 | static int paeth(int a, int b, int c) |
2641 | { |
2642 | int p = a + b - c; |
2643 | int pa = abs(p-a); |
2644 | int pb = abs(p-b); |
2645 | int pc = abs(p-c); |
2646 | if (pa <= pb && pa <= pc) return a; |
2647 | if (pb <= pc) return b; |
2648 | return c; |
2649 | } |
2650 | |
2651 | // create the png data from post-deflated data |
2652 | static int create_png_image_raw(png *a, uint8 *raw, uint32 raw_len, int out_n, uint32 x, uint32 y) |
2653 | { |
2654 | stbi *s = &a->s; |
2655 | uint32 i,j,stride = x*out_n; |
2656 | int k; |
2657 | int img_n = s->img_n; // copy it into a local for later |
2658 | assert(out_n == s->img_n || out_n == s->img_n+1); |
2659 | if (stbi_png_partial) y = 1; |
2660 | a->out = MALLOC(x * y * out_n); |
2661 | if (!a->out) return e("outofmem" , "Out of memory" ); |
2662 | if (!stbi_png_partial) { |
2663 | if (s->img_x == x && s->img_y == y) { |
2664 | if (raw_len != (img_n * x + 1) * y) return e("not enough pixels" ,"Corrupt PNG" ); |
2665 | } else { // interlaced: |
2666 | if (raw_len < (img_n * x + 1) * y) return e("not enough pixels" ,"Corrupt PNG" ); |
2667 | } |
2668 | } |
2669 | for (j=0; j < y; ++j) { |
2670 | uint8 *cur = a->out + stride*j; |
2671 | uint8 *prior = cur - stride; |
2672 | int filter = *raw++; |
2673 | if (filter > 4) return e("invalid filter" ,"Corrupt PNG" ); |
2674 | // if first row, use special filter that doesn't sample previous row |
2675 | if (j == 0) filter = first_row_filter[filter]; |
2676 | // handle first pixel explicitly |
2677 | for (k=0; k < img_n; ++k) { |
2678 | switch (filter) { |
2679 | case F_none : cur[k] = raw[k]; break; |
2680 | case F_sub : cur[k] = raw[k]; break; |
2681 | case F_up : cur[k] = raw[k] + prior[k]; break; |
2682 | case F_avg : cur[k] = raw[k] + (prior[k]>>1); break; |
2683 | case F_paeth : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break; |
2684 | case F_avg_first : cur[k] = raw[k]; break; |
2685 | case F_paeth_first: cur[k] = raw[k]; break; |
2686 | } |
2687 | } |
2688 | if (img_n != out_n) cur[img_n] = 255; |
2689 | raw += img_n; |
2690 | cur += out_n; |
2691 | prior += out_n; |
2692 | // this is a little gross, so that we don't switch per-pixel or per-component |
2693 | if (img_n == out_n) { |
2694 | #define CASE(f) \ |
2695 | case f: \ |
2696 | for (i=x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \ |
2697 | for (k=0; k < img_n; ++k) |
2698 | switch (filter) { |
2699 | CASE(F_none) cur[k] = raw[k]; break; |
2700 | CASE(F_sub) cur[k] = raw[k] + cur[k-img_n]; break; |
2701 | CASE(F_up) cur[k] = raw[k] + prior[k]; break; |
2702 | CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break; |
2703 | CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break; |
2704 | CASE(F_avg_first) cur[k] = raw[k] + (cur[k-img_n] >> 1); break; |
2705 | CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break; |
2706 | } |
2707 | #undef CASE |
2708 | } else { |
2709 | assert(img_n+1 == out_n); |
2710 | #define CASE(f) \ |
2711 | case f: \ |
2712 | for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \ |
2713 | for (k=0; k < img_n; ++k) |
2714 | switch (filter) { |
2715 | CASE(F_none) cur[k] = raw[k]; break; |
2716 | CASE(F_sub) cur[k] = raw[k] + cur[k-out_n]; break; |
2717 | CASE(F_up) cur[k] = raw[k] + prior[k]; break; |
2718 | CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break; |
2719 | CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break; |
2720 | CASE(F_avg_first) cur[k] = raw[k] + (cur[k-out_n] >> 1); break; |
2721 | CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break; |
2722 | } |
2723 | #undef CASE |
2724 | } |
2725 | } |
2726 | return 1; |
2727 | } |
2728 | |
2729 | static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n, int interlaced) |
2730 | { |
2731 | uint8 *final; |
2732 | int p; |
2733 | int save; |
2734 | if (!interlaced) |
2735 | return create_png_image_raw(a, raw, raw_len, out_n, a->s.img_x, a->s.img_y); |
2736 | save = stbi_png_partial; |
2737 | stbi_png_partial = 0; |
2738 | |
2739 | // de-interlacing |
2740 | final = MALLOC(a->s.img_x * a->s.img_y * out_n); |
2741 | for (p=0; p < 7; ++p) { |
2742 | int xorig[] = { 0,4,0,2,0,1,0 }; |
2743 | int yorig[] = { 0,0,4,0,2,0,1 }; |
2744 | int xspc[] = { 8,8,4,4,2,2,1 }; |
2745 | int yspc[] = { 8,8,8,4,4,2,2 }; |
2746 | int i,j,x,y; |
2747 | // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1 |
2748 | x = (a->s.img_x - xorig[p] + xspc[p]-1) / xspc[p]; |
2749 | y = (a->s.img_y - yorig[p] + yspc[p]-1) / yspc[p]; |
2750 | if (x && y) { |
2751 | if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) { |
2752 | FREE(final); |
2753 | return 0; |
2754 | } |
2755 | for (j=0; j < y; ++j) |
2756 | for (i=0; i < x; ++i) |
2757 | memcpy(final + (j*yspc[p]+yorig[p])*a->s.img_x*out_n + (i*xspc[p]+xorig[p])*out_n, |
2758 | a->out + (j*x+i)*out_n, out_n); |
2759 | FREE(a->out); |
2760 | raw += (x*out_n+1)*y; |
2761 | raw_len -= (x*out_n+1)*y; |
2762 | } |
2763 | } |
2764 | a->out = final; |
2765 | |
2766 | stbi_png_partial = save; |
2767 | return 1; |
2768 | } |
2769 | |
2770 | static int compute_transparency(png *z, uint8 tc[3], int out_n) |
2771 | { |
2772 | stbi *s = &z->s; |
2773 | uint32 i, pixel_count = s->img_x * s->img_y; |
2774 | uint8 *p = z->out; |
2775 | |
2776 | // compute color-based transparency, assuming we've |
2777 | // already got 255 as the alpha value in the output |
2778 | assert(out_n == 2 || out_n == 4); |
2779 | |
2780 | if (out_n == 2) { |
2781 | for (i=0; i < pixel_count; ++i) { |
2782 | p[1] = (p[0] == tc[0] ? 0 : 255); |
2783 | p += 2; |
2784 | } |
2785 | } else { |
2786 | for (i=0; i < pixel_count; ++i) { |
2787 | if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2]) |
2788 | p[3] = 0; |
2789 | p += 4; |
2790 | } |
2791 | } |
2792 | return 1; |
2793 | } |
2794 | |
2795 | static int expand_palette(png *a, uint8 *palette, int len, int pal_img_n) |
2796 | { |
2797 | uint32 i, pixel_count = a->s.img_x * a->s.img_y; |
2798 | uint8 *p, *temp_out, *orig = a->out; |
2799 | |
2800 | p = MALLOC(pixel_count * pal_img_n); |
2801 | if (p == NULL) return e("outofmem" , "Out of memory" ); |
2802 | |
2803 | // between here and FREE(out) below, exiting would leak |
2804 | temp_out = p; |
2805 | |
2806 | if (pal_img_n == 3) { |
2807 | for (i=0; i < pixel_count; ++i) { |
2808 | int n = orig[i]*4; |
2809 | p[0] = palette[n ]; |
2810 | p[1] = palette[n+1]; |
2811 | p[2] = palette[n+2]; |
2812 | p += 3; |
2813 | } |
2814 | } else { |
2815 | for (i=0; i < pixel_count; ++i) { |
2816 | int n = orig[i]*4; |
2817 | p[0] = palette[n ]; |
2818 | p[1] = palette[n+1]; |
2819 | p[2] = palette[n+2]; |
2820 | p[3] = palette[n+3]; |
2821 | p += 4; |
2822 | } |
2823 | } |
2824 | FREE(a->out); |
2825 | a->out = temp_out; |
2826 | |
2827 | STBI_NOTUSED(len); |
2828 | |
2829 | return 1; |
2830 | } |
2831 | |
2832 | static int stbi_unpremultiply_on_load = 0; |
2833 | static int stbi_de_iphone_flag = 0; |
2834 | |
2835 | void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply) |
2836 | { |
2837 | stbi_unpremultiply_on_load = flag_true_if_should_unpremultiply; |
2838 | } |
2839 | void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert) |
2840 | { |
2841 | stbi_de_iphone_flag = flag_true_if_should_convert; |
2842 | } |
2843 | |
2844 | static void stbi_de_iphone(png *z) |
2845 | { |
2846 | stbi *s = &z->s; |
2847 | uint32 i, pixel_count = s->img_x * s->img_y; |
2848 | uint8 *p = z->out; |
2849 | |
2850 | if (s->img_out_n == 3) { // convert bgr to rgb |
2851 | for (i=0; i < pixel_count; ++i) { |
2852 | uint8 t = p[0]; |
2853 | p[0] = p[2]; |
2854 | p[2] = t; |
2855 | p += 3; |
2856 | } |
2857 | } else { |
2858 | assert(s->img_out_n == 4); |
2859 | if (stbi_unpremultiply_on_load) { |
2860 | // convert bgr to rgb and unpremultiply |
2861 | for (i=0; i < pixel_count; ++i) { |
2862 | uint8 a = p[3]; |
2863 | uint8 t = p[0]; |
2864 | if (a) { |
2865 | p[0] = p[2] * 255 / a; |
2866 | p[1] = p[1] * 255 / a; |
2867 | p[2] = t * 255 / a; |
2868 | } else { |
2869 | p[0] = p[2]; |
2870 | p[2] = t; |
2871 | } |
2872 | p += 4; |
2873 | } |
2874 | } else { |
2875 | // convert bgr to rgb |
2876 | for (i=0; i < pixel_count; ++i) { |
2877 | uint8 t = p[0]; |
2878 | p[0] = p[2]; |
2879 | p[2] = t; |
2880 | p += 4; |
2881 | } |
2882 | } |
2883 | } |
2884 | } |
2885 | |
2886 | static int parse_png_file(png *z, int scan, int req_comp) |
2887 | { |
2888 | uint8 palette[1024], pal_img_n=0; |
2889 | uint8 has_trans=0, tc[3]; |
2890 | uint32 ioff=0, idata_limit=0, i, pal_len=0; |
2891 | int first=1,k,interlace=0, iphone=0; |
2892 | stbi *s = &z->s; |
2893 | |
2894 | if (!check_png_header(s)) return 0; |
2895 | |
2896 | if (scan == SCAN_type) return 1; |
2897 | |
2898 | for (;;) { |
2899 | chunk c = get_chunk_header(s); |
2900 | switch (c.type) { |
2901 | case PNG_TYPE('C','g','B','I'): |
2902 | iphone = stbi_de_iphone_flag; |
2903 | skip(s, c.length); |
2904 | break; |
2905 | case PNG_TYPE('I','H','D','R'): { |
2906 | int depth,color,comp,filter; |
2907 | if (!first) return e("multiple IHDR" ,"Corrupt PNG" ); |
2908 | first = 0; |
2909 | if (c.length != 13) return e("bad IHDR len" ,"Corrupt PNG" ); |
2910 | s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large" ,"Very large image (corrupt?)" ); |
2911 | s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large" ,"Very large image (corrupt?)" ); |
2912 | depth = get8(s); if (depth != 8) return e("8bit only" ,"PNG not supported: 8-bit only" ); |
2913 | color = get8(s); if (color > 6) return e("bad ctype" ,"Corrupt PNG" ); |
2914 | if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype" ,"Corrupt PNG" ); |
2915 | comp = get8(s); if (comp) return e("bad comp method" ,"Corrupt PNG" ); |
2916 | filter= get8(s); if (filter) return e("bad filter method" ,"Corrupt PNG" ); |
2917 | interlace = get8(s); if (interlace>1) return e("bad interlace method" ,"Corrupt PNG" ); |
2918 | if (!s->img_x || !s->img_y) return e("0-pixel image" ,"Corrupt PNG" ); |
2919 | if (!pal_img_n) { |
2920 | s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0); |
2921 | if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large" , "Image too large to decode" ); |
2922 | if (scan == SCAN_header) return 1; |
2923 | } else { |
2924 | // if paletted, then pal_n is our final components, and |
2925 | // img_n is # components to decompress/filter. |
2926 | s->img_n = 1; |
2927 | if ((1 << 30) / s->img_x / 4 < s->img_y) return e("too large" ,"Corrupt PNG" ); |
2928 | // if SCAN_header, have to scan to see if we have a tRNS |
2929 | } |
2930 | break; |
2931 | } |
2932 | |
2933 | case PNG_TYPE('P','L','T','E'): { |
2934 | if (first) return e("first not IHDR" , "Corrupt PNG" ); |
2935 | if (c.length > 256*3) return e("invalid PLTE" ,"Corrupt PNG" ); |
2936 | pal_len = c.length / 3; |
2937 | if (pal_len * 3 != c.length) return e("invalid PLTE" ,"Corrupt PNG" ); |
2938 | for (i=0; i < pal_len; ++i) { |
2939 | palette[i*4+0] = get8u(s); |
2940 | palette[i*4+1] = get8u(s); |
2941 | palette[i*4+2] = get8u(s); |
2942 | palette[i*4+3] = 255; |
2943 | } |
2944 | break; |
2945 | } |
2946 | |
2947 | case PNG_TYPE('t','R','N','S'): { |
2948 | if (first) return e("first not IHDR" , "Corrupt PNG" ); |
2949 | if (z->idata) return e("tRNS after IDAT" ,"Corrupt PNG" ); |
2950 | if (pal_img_n) { |
2951 | if (scan == SCAN_header) { s->img_n = 4; return 1; } |
2952 | if (pal_len == 0) return e("tRNS before PLTE" ,"Corrupt PNG" ); |
2953 | if (c.length > pal_len) return e("bad tRNS len" ,"Corrupt PNG" ); |
2954 | pal_img_n = 4; |
2955 | for (i=0; i < c.length; ++i) |
2956 | palette[i*4+3] = get8u(s); |
2957 | } else { |
2958 | if (!(s->img_n & 1)) return e("tRNS with alpha" ,"Corrupt PNG" ); |
2959 | if (c.length != (uint32) s->img_n*2) return e("bad tRNS len" ,"Corrupt PNG" ); |
2960 | has_trans = 1; |
2961 | for (k=0; k < s->img_n; ++k) |
2962 | tc[k] = (uint8) get16(s); // non 8-bit images will be larger |
2963 | } |
2964 | break; |
2965 | } |
2966 | |
2967 | case PNG_TYPE('I','D','A','T'): { |
2968 | if (first) return e("first not IHDR" , "Corrupt PNG" ); |
2969 | if (pal_img_n && !pal_len) return e("no PLTE" ,"Corrupt PNG" ); |
2970 | if (scan == SCAN_header) { s->img_n = pal_img_n; return 1; } |
2971 | if (ioff + c.length > idata_limit) { |
2972 | uint8 *p; |
2973 | if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096; |
2974 | while (ioff + c.length > idata_limit) |
2975 | idata_limit *= 2; |
2976 | p = (uint8 *) REALLOC(z->idata, idata_limit); if (p == NULL) return e("outofmem" , "Out of memory" ); |
2977 | z->idata = p; |
2978 | } |
2979 | if (!getn(s, z->idata+ioff,c.length)) return e("outofdata" ,"Corrupt PNG" ); |
2980 | ioff += c.length; |
2981 | break; |
2982 | } |
2983 | |
2984 | case PNG_TYPE('I','E','N','D'): { |
2985 | uint32 raw_len; |
2986 | if (first) return e("first not IHDR" , "Corrupt PNG" ); |
2987 | if (scan != SCAN_load) return 1; |
2988 | if (z->idata == NULL) return e("no IDAT" ,"Corrupt PNG" ); |
2989 | z->expanded = (uint8 *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, 16384, (int *) &raw_len, !iphone); |
2990 | if (z->expanded == NULL) return 0; // zlib should set error |
2991 | FREE(z->idata); z->idata = NULL; |
2992 | if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans) |
2993 | s->img_out_n = s->img_n+1; |
2994 | else |
2995 | s->img_out_n = s->img_n; |
2996 | if (!create_png_image(z, z->expanded, raw_len, s->img_out_n, interlace)) return 0; |
2997 | if (has_trans) |
2998 | if (!compute_transparency(z, tc, s->img_out_n)) return 0; |
2999 | if (iphone && s->img_out_n > 2) |
3000 | stbi_de_iphone(z); |
3001 | if (pal_img_n) { |
3002 | // pal_img_n == 3 or 4 |
3003 | s->img_n = pal_img_n; // record the actual colors we had |
3004 | s->img_out_n = pal_img_n; |
3005 | if (req_comp >= 3) s->img_out_n = req_comp; |
3006 | if (!expand_palette(z, palette, pal_len, s->img_out_n)) |
3007 | return 0; |
3008 | } |
3009 | FREE(z->expanded); z->expanded = NULL; |
3010 | return 1; |
3011 | } |
3012 | |
3013 | default: |
3014 | // if critical, fail |
3015 | if (first) return e("first not IHDR" , "Corrupt PNG" ); |
3016 | if ((c.type & (1 << 29)) == 0) { |
3017 | #ifndef STBI_NO_FAILURE_STRINGS |
3018 | // not threadsafe |
3019 | static char invalid_chunk[] = "XXXX chunk not known" ; |
3020 | invalid_chunk[0] = (uint8) (c.type >> 24); |
3021 | invalid_chunk[1] = (uint8) (c.type >> 16); |
3022 | invalid_chunk[2] = (uint8) (c.type >> 8); |
3023 | invalid_chunk[3] = (uint8) (c.type >> 0); |
3024 | #endif |
3025 | return e(invalid_chunk, "PNG not supported: unknown chunk type" ); |
3026 | } |
3027 | skip(s, c.length); |
3028 | break; |
3029 | } |
3030 | // end of chunk, read and skip CRC |
3031 | get32(s); |
3032 | } |
3033 | } |
3034 | |
3035 | static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp) |
3036 | { |
3037 | unsigned char *result=NULL; |
3038 | p->expanded = NULL; |
3039 | p->idata = NULL; |
3040 | p->out = NULL; |
3041 | if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp" , "Internal error" ); |
3042 | if (parse_png_file(p, SCAN_load, req_comp)) { |
3043 | result = p->out; |
3044 | p->out = NULL; |
3045 | if (req_comp && req_comp != p->s.img_out_n) { |
3046 | result = convert_format(result, p->s.img_out_n, req_comp, p->s.img_x, p->s.img_y); |
3047 | p->s.img_out_n = req_comp; |
3048 | if (result == NULL) return result; |
3049 | } |
3050 | *x = p->s.img_x; |
3051 | *y = p->s.img_y; |
3052 | if (n) *n = p->s.img_n; |
3053 | } |
3054 | FREE(p->expanded); p->expanded = NULL; |
3055 | FREE(p->idata); p->idata = NULL; |
3056 | |
3057 | return result; |
3058 | } |
3059 | |
3060 | #ifndef STBI_NO_STDIO |
3061 | unsigned char *stbi_png_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
3062 | { |
3063 | png p; |
3064 | start_file(&p.s, f); |
3065 | return do_png(&p, x,y,comp,req_comp); |
3066 | } |
3067 | |
3068 | unsigned char *stbi_png_load(char const *filename, int *x, int *y, int *comp, int req_comp) |
3069 | { |
3070 | unsigned char *data; |
3071 | FILE *f = fopen(filename, "rb" ); |
3072 | if (!f) return NULL; |
3073 | data = stbi_png_load_from_file(f,x,y,comp,req_comp); |
3074 | fclose(f); |
3075 | return data; |
3076 | } |
3077 | #endif |
3078 | |
3079 | unsigned char *stbi_png_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
3080 | { |
3081 | png p; |
3082 | start_mem(&p.s, buffer,len); |
3083 | return do_png(&p, x,y,comp,req_comp); |
3084 | } |
3085 | |
3086 | #ifndef STBI_NO_STDIO |
3087 | int stbi_png_test_file(FILE *f) |
3088 | { |
3089 | png p; |
3090 | int n,r; |
3091 | n = ftell(f); |
3092 | start_file(&p.s, f); |
3093 | r = parse_png_file(&p, SCAN_type,STBI_default); |
3094 | fseek(f,n,SEEK_SET); |
3095 | return r; |
3096 | } |
3097 | #endif |
3098 | |
3099 | int stbi_png_test_memory(stbi_uc const *buffer, int len) |
3100 | { |
3101 | png p; |
3102 | start_mem(&p.s, buffer, len); |
3103 | return parse_png_file(&p, SCAN_type,STBI_default); |
3104 | } |
3105 | |
3106 | static int stbi_png_info_raw(png *p, int *x, int *y, int *comp) |
3107 | { |
3108 | if (!parse_png_file(p, SCAN_header, 0)) |
3109 | return 0; |
3110 | if (x) *x = p->s.img_x; |
3111 | if (y) *y = p->s.img_y; |
3112 | if (comp) *comp = p->s.img_n; |
3113 | return 1; |
3114 | } |
3115 | |
3116 | #ifndef STBI_NO_STDIO |
3117 | int stbi_png_info (char const *filename, int *x, int *y, int *comp) |
3118 | { |
3119 | int res; |
3120 | FILE *f = fopen(filename, "rb" ); |
3121 | if (!f) return 0; |
3122 | res = stbi_png_info_from_file(f, x, y, comp); |
3123 | fclose(f); |
3124 | return res; |
3125 | } |
3126 | |
3127 | int stbi_png_info_from_file(FILE *f, int *x, int *y, int *comp) |
3128 | { |
3129 | png p; |
3130 | int res; |
3131 | long n = ftell(f); |
3132 | start_file(&p.s, f); |
3133 | res = stbi_png_info_raw(&p, x, y, comp); |
3134 | fseek(f, n, SEEK_SET); |
3135 | return res; |
3136 | } |
3137 | #endif // !STBI_NO_STDIO |
3138 | |
3139 | int stbi_png_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) |
3140 | { |
3141 | png p; |
3142 | start_mem(&p.s, buffer, len); |
3143 | return stbi_png_info_raw(&p, x, y, comp); |
3144 | } |
3145 | |
3146 | // Microsoft/Windows BMP image |
3147 | |
3148 | static int bmp_test(stbi *s) |
3149 | { |
3150 | int sz; |
3151 | if (get8(s) != 'B') return 0; |
3152 | if (get8(s) != 'M') return 0; |
3153 | get32le(s); // discard filesize |
3154 | get16le(s); // discard reserved |
3155 | get16le(s); // discard reserved |
3156 | get32le(s); // discard data offset |
3157 | sz = get32le(s); |
3158 | if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1; |
3159 | return 0; |
3160 | } |
3161 | |
3162 | #ifndef STBI_NO_STDIO |
3163 | int stbi_bmp_test_file (FILE *f) |
3164 | { |
3165 | stbi s; |
3166 | int r,n = ftell(f); |
3167 | start_file(&s,f); |
3168 | r = bmp_test(&s); |
3169 | fseek(f,n,SEEK_SET); |
3170 | return r; |
3171 | } |
3172 | #endif |
3173 | |
3174 | int stbi_bmp_test_memory (stbi_uc const *buffer, int len) |
3175 | { |
3176 | stbi s; |
3177 | start_mem(&s, buffer, len); |
3178 | return bmp_test(&s); |
3179 | } |
3180 | |
3181 | // returns 0..31 for the highest set bit |
3182 | static int high_bit(unsigned int z) |
3183 | { |
3184 | int n=0; |
3185 | if (z == 0) return -1; |
3186 | if (z >= 0x10000) n += 16, z >>= 16; |
3187 | if (z >= 0x00100) n += 8, z >>= 8; |
3188 | if (z >= 0x00010) n += 4, z >>= 4; |
3189 | if (z >= 0x00004) n += 2, z >>= 2; |
3190 | if (z >= 0x00002) n += 1, z >>= 1; |
3191 | return n; |
3192 | } |
3193 | |
3194 | static int bitcount(unsigned int a) |
3195 | { |
3196 | a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2 |
3197 | a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4 |
3198 | a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits |
3199 | a = (a + (a >> 8)); // max 16 per 8 bits |
3200 | a = (a + (a >> 16)); // max 32 per 8 bits |
3201 | return a & 0xff; |
3202 | } |
3203 | |
3204 | static int shiftsigned(int v, int shift, int bits) |
3205 | { |
3206 | int result; |
3207 | int z=0; |
3208 | |
3209 | if (shift < 0) v <<= -shift; |
3210 | else v >>= shift; |
3211 | result = v; |
3212 | |
3213 | z = bits; |
3214 | while (z < 8) { |
3215 | result += v >> z; |
3216 | z += bits; |
3217 | } |
3218 | return result; |
3219 | } |
3220 | |
3221 | static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp) |
3222 | { |
3223 | uint8 *out; |
3224 | unsigned int mr=0,mg=0,mb=0,ma=0; |
3225 | stbi_uc pal[256][4]; |
3226 | int psize=0,i,j,compress=0,width; |
3227 | int bpp, flip_vertically, pad, target, offset, hsz; |
3228 | if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP" , "Corrupt BMP" ); |
3229 | get32le(s); // discard filesize |
3230 | get16le(s); // discard reserved |
3231 | get16le(s); // discard reserved |
3232 | offset = get32le(s); |
3233 | hsz = get32le(s); |
3234 | if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP" , "BMP type not supported: unknown" ); |
3235 | if (hsz == 12) { |
3236 | s->img_x = get16le(s); |
3237 | s->img_y = get16le(s); |
3238 | } else { |
3239 | s->img_x = get32le(s); |
3240 | s->img_y = get32le(s); |
3241 | } |
3242 | if (get16le(s) != 1) return epuc("bad BMP" , "bad BMP" ); |
3243 | bpp = get16le(s); |
3244 | if (bpp == 1) return epuc("monochrome" , "BMP type not supported: 1-bit" ); |
3245 | flip_vertically = ((int) s->img_y) > 0; |
3246 | s->img_y = abs((int) s->img_y); |
3247 | if (hsz == 12) { |
3248 | if (bpp < 24) |
3249 | psize = (offset - 14 - 24) / 3; |
3250 | } else { |
3251 | compress = get32le(s); |
3252 | if (compress == 1 || compress == 2) return epuc("BMP RLE" , "BMP type not supported: RLE" ); |
3253 | get32le(s); // discard sizeof |
3254 | get32le(s); // discard hres |
3255 | get32le(s); // discard vres |
3256 | get32le(s); // discard colorsused |
3257 | get32le(s); // discard max important |
3258 | if (hsz == 40 || hsz == 56) { |
3259 | if (hsz == 56) { |
3260 | get32le(s); |
3261 | get32le(s); |
3262 | get32le(s); |
3263 | get32le(s); |
3264 | } |
3265 | if (bpp == 16 || bpp == 32) { |
3266 | mr = mg = mb = 0; |
3267 | if (compress == 0) { |
3268 | if (bpp == 32) { |
3269 | mr = 0xffu << 16; |
3270 | mg = 0xffu << 8; |
3271 | mb = 0xffu << 0; |
3272 | ma = 0xffu << 24; |
3273 | } else { |
3274 | mr = 31u << 10; |
3275 | mg = 31u << 5; |
3276 | mb = 31u << 0; |
3277 | } |
3278 | } else if (compress == 3) { |
3279 | mr = get32le(s); |
3280 | mg = get32le(s); |
3281 | mb = get32le(s); |
3282 | // not documented, but generated by photoshop and handled by mspaint |
3283 | if (mr == mg && mg == mb) { |
3284 | // ?!?!? |
3285 | return epuc("bad BMP" , "bad BMP" ); |
3286 | } |
3287 | } else |
3288 | return epuc("bad BMP" , "bad BMP" ); |
3289 | } |
3290 | } else { |
3291 | assert(hsz == 108); |
3292 | mr = get32le(s); |
3293 | mg = get32le(s); |
3294 | mb = get32le(s); |
3295 | ma = get32le(s); |
3296 | get32le(s); // discard color space |
3297 | for (i=0; i < 12; ++i) |
3298 | get32le(s); // discard color space parameters |
3299 | } |
3300 | if (bpp < 16) |
3301 | psize = (offset - 14 - hsz) >> 2; |
3302 | } |
3303 | s->img_n = ma ? 4 : 3; |
3304 | if (req_comp && req_comp >= 3) // we can directly decode 3 or 4 |
3305 | target = req_comp; |
3306 | else |
3307 | target = s->img_n; // if they want monochrome, we'll post-convert |
3308 | out = MALLOC(target * s->img_x * s->img_y); |
3309 | if (!out) return epuc("outofmem" , "Out of memory" ); |
3310 | if (bpp < 16) { |
3311 | int z=0; |
3312 | if (psize == 0 || psize > 256) { FREE(out); return epuc("invalid" , "Corrupt BMP" ); } |
3313 | for (i=0; i < psize; ++i) { |
3314 | pal[i][2] = get8u(s); |
3315 | pal[i][1] = get8u(s); |
3316 | pal[i][0] = get8u(s); |
3317 | if (hsz != 12) get8(s); |
3318 | pal[i][3] = 255; |
3319 | } |
3320 | skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4)); |
3321 | if (bpp == 4) width = (s->img_x + 1) >> 1; |
3322 | else if (bpp == 8) width = s->img_x; |
3323 | else { FREE(out); return epuc("bad bpp" , "Corrupt BMP" ); } |
3324 | pad = (-width)&3; |
3325 | for (j=0; j < (int) s->img_y; ++j) { |
3326 | for (i=0; i < (int) s->img_x; i += 2) { |
3327 | int v=get8(s),v2=0; |
3328 | if (bpp == 4) { |
3329 | v2 = v & 15; |
3330 | v >>= 4; |
3331 | } |
3332 | out[z++] = pal[v][0]; |
3333 | out[z++] = pal[v][1]; |
3334 | out[z++] = pal[v][2]; |
3335 | if (target == 4) out[z++] = 255; |
3336 | if (i+1 == (int) s->img_x) break; |
3337 | v = (bpp == 8) ? get8(s) : v2; |
3338 | out[z++] = pal[v][0]; |
3339 | out[z++] = pal[v][1]; |
3340 | out[z++] = pal[v][2]; |
3341 | if (target == 4) out[z++] = 255; |
3342 | } |
3343 | skip(s, pad); |
3344 | } |
3345 | } else { |
3346 | int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0; |
3347 | int z = 0; |
3348 | int easy=0; |
3349 | skip(s, offset - 14 - hsz); |
3350 | if (bpp == 24) width = 3 * s->img_x; |
3351 | else if (bpp == 16) width = 2*s->img_x; |
3352 | else /* bpp = 32 and pad = 0 */ width=0; |
3353 | pad = (-width) & 3; |
3354 | if (bpp == 24) { |
3355 | easy = 1; |
3356 | } else if (bpp == 32) { |
3357 | if (mb == 0xff && mg == 0xff00 && mr == 0xff000000 && ma == 0xff000000) |
3358 | easy = 2; |
3359 | } |
3360 | if (!easy) { |
3361 | if (!mr || !mg || !mb) { |
3362 | FREE(out); |
3363 | return epuc("bad masks" , "Corrupt BMP" ); |
3364 | } |
3365 | // right shift amt to put high bit in position #7 |
3366 | rshift = high_bit(mr)-7; rcount = bitcount(mr); |
3367 | gshift = high_bit(mg)-7; gcount = bitcount(mr); |
3368 | bshift = high_bit(mb)-7; bcount = bitcount(mr); |
3369 | ashift = high_bit(ma)-7; acount = bitcount(mr); |
3370 | } |
3371 | for (j=0; j < (int) s->img_y; ++j) { |
3372 | if (easy) { |
3373 | for (i=0; i < (int) s->img_x; ++i) { |
3374 | int a; |
3375 | out[z+2] = get8u(s); |
3376 | out[z+1] = get8u(s); |
3377 | out[z+0] = get8u(s); |
3378 | z += 3; |
3379 | a = (easy == 2 ? get8(s) : 255); |
3380 | if (target == 4) out[z++] = (uint8) a; |
3381 | } |
3382 | } else { |
3383 | for (i=0; i < (int) s->img_x; ++i) { |
3384 | uint32 v = (bpp == 16 ? get16le(s) : get32le(s)); |
3385 | int a; |
3386 | out[z++] = (uint8) shiftsigned(v & mr, rshift, rcount); |
3387 | out[z++] = (uint8) shiftsigned(v & mg, gshift, gcount); |
3388 | out[z++] = (uint8) shiftsigned(v & mb, bshift, bcount); |
3389 | a = (ma ? shiftsigned(v & ma, ashift, acount) : 255); |
3390 | if (target == 4) out[z++] = (uint8) a; |
3391 | } |
3392 | } |
3393 | skip(s, pad); |
3394 | } |
3395 | } |
3396 | if (flip_vertically) { |
3397 | stbi_uc t; |
3398 | for (j=0; j < (int) s->img_y>>1; ++j) { |
3399 | stbi_uc *p1 = out + j *s->img_x*target; |
3400 | stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target; |
3401 | for (i=0; i < (int) s->img_x*target; ++i) { |
3402 | t = p1[i], p1[i] = p2[i], p2[i] = t; |
3403 | } |
3404 | } |
3405 | } |
3406 | |
3407 | if (req_comp && req_comp != target) { |
3408 | out = convert_format(out, target, req_comp, s->img_x, s->img_y); |
3409 | if (out == NULL) return out; // convert_format frees input on failure |
3410 | } |
3411 | |
3412 | *x = s->img_x; |
3413 | *y = s->img_y; |
3414 | if (comp) *comp = target; |
3415 | return out; |
3416 | } |
3417 | |
3418 | #ifndef STBI_NO_STDIO |
3419 | stbi_uc *stbi_bmp_load (char const *filename, int *x, int *y, int *comp, int req_comp) |
3420 | { |
3421 | stbi_uc *data; |
3422 | FILE *f = fopen(filename, "rb" ); |
3423 | if (!f) return NULL; |
3424 | data = stbi_bmp_load_from_file(f, x,y,comp,req_comp); |
3425 | fclose(f); |
3426 | return data; |
3427 | } |
3428 | |
3429 | stbi_uc *stbi_bmp_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) |
3430 | { |
3431 | stbi s; |
3432 | start_file(&s, f); |
3433 | return bmp_load(&s, x,y,comp,req_comp); |
3434 | } |
3435 | #endif |
3436 | |
3437 | stbi_uc *stbi_bmp_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
3438 | { |
3439 | stbi s; |
3440 | start_mem(&s, buffer, len); |
3441 | return bmp_load(&s, x,y,comp,req_comp); |
3442 | } |
3443 | |
3444 | // Targa Truevision - TGA |
3445 | // by Jonathan Dummer |
3446 | |
3447 | static int tga_info(stbi *s, int *x, int *y, int *comp) |
3448 | { |
3449 | int tga_w, tga_h, tga_comp; |
3450 | int sz; |
3451 | get8u(s); // discard Offset |
3452 | sz = get8u(s); // color type |
3453 | if( sz > 1 ) return 0; // only RGB or indexed allowed |
3454 | sz = get8u(s); // image type |
3455 | // only RGB or grey allowed, +/- RLE |
3456 | if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0; |
3457 | get16le(s); // discard palette start |
3458 | get16le(s); // discard palette length |
3459 | get8(s); // discard bits per palette color entry |
3460 | get16le(s); // discard x origin |
3461 | get16le(s); // discard y origin |
3462 | tga_w = get16le(s); |
3463 | if( tga_w < 1 ) return 0; // test width |
3464 | tga_h = get16le(s); |
3465 | if( tga_h < 1 ) return 0; // test height |
3466 | sz = get8(s); // bits per pixel |
3467 | // only RGB or RGBA or grey allowed |
3468 | if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) return 0; |
3469 | tga_comp = sz; |
3470 | if (x) *x = tga_w; |
3471 | if (y) *y = tga_h; |
3472 | if (comp) *comp = tga_comp / 8; |
3473 | return 1; // seems to have passed everything |
3474 | } |
3475 | |
3476 | #ifndef STBI_NO_STDIO |
3477 | int stbi_tga_info_from_file(FILE *f, int *x, int *y, int *comp) |
3478 | { |
3479 | stbi s; |
3480 | int r; |
3481 | long n = ftell(f); |
3482 | start_file(&s, f); |
3483 | r = tga_info(&s, x, y, comp); |
3484 | fseek(f, n, SEEK_SET); |
3485 | return r; |
3486 | } |
3487 | #endif |
3488 | |
3489 | int stbi_tga_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) |
3490 | { |
3491 | stbi s; |
3492 | start_mem(&s, buffer, len); |
3493 | return tga_info(&s, x, y, comp); |
3494 | } |
3495 | |
3496 | static int tga_test(stbi *s) |
3497 | { |
3498 | int sz; |
3499 | get8u(s); // discard Offset |
3500 | sz = get8u(s); // color type |
3501 | if ( sz > 1 ) return 0; // only RGB or indexed allowed |
3502 | sz = get8u(s); // image type |
3503 | if ( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE |
3504 | get16(s); // discard palette start |
3505 | get16(s); // discard palette length |
3506 | get8(s); // discard bits per palette color entry |
3507 | get16(s); // discard x origin |
3508 | get16(s); // discard y origin |
3509 | if ( get16(s) < 1 ) return 0; // test width |
3510 | if ( get16(s) < 1 ) return 0; // test height |
3511 | sz = get8(s); // bits per pixel |
3512 | if ( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0; // only RGB or RGBA or grey allowed |
3513 | return 1; // seems to have passed everything |
3514 | } |
3515 | |
3516 | #ifndef STBI_NO_STDIO |
3517 | int stbi_tga_test_file (FILE *f) |
3518 | { |
3519 | stbi s; |
3520 | int r,n = ftell(f); |
3521 | start_file(&s, f); |
3522 | r = tga_test(&s); |
3523 | fseek(f,n,SEEK_SET); |
3524 | return r; |
3525 | } |
3526 | #endif |
3527 | |
3528 | int stbi_tga_test_memory (stbi_uc const *buffer, int len) |
3529 | { |
3530 | stbi s; |
3531 | start_mem(&s, buffer, len); |
3532 | return tga_test(&s); |
3533 | } |
3534 | |
3535 | static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp) |
3536 | { |
3537 | // read in the TGA header stuff |
3538 | int tga_offset = get8u(s); |
3539 | int tga_indexed = get8u(s); |
3540 | int tga_image_type = get8u(s); |
3541 | int tga_is_RLE = 0; |
3542 | int tga_palette_start = get16le(s); |
3543 | int tga_palette_len = get16le(s); |
3544 | int tga_palette_bits = get8u(s); |
3545 | int tga_x_origin = get16le(s); |
3546 | int tga_y_origin = get16le(s); |
3547 | int tga_width = get16le(s); |
3548 | int tga_height = get16le(s); |
3549 | int tga_bits_per_pixel = get8u(s); |
3550 | int tga_inverted = get8u(s); |
3551 | // image data |
3552 | unsigned char *tga_data; |
3553 | unsigned char *tga_palette = NULL; |
3554 | int i, j; |
3555 | unsigned char raw_data[4]; |
3556 | unsigned char trans_data[4]; |
3557 | int RLE_count = 0; |
3558 | int RLE_repeating = 0; |
3559 | int read_next_pixel = 1; |
3560 | |
3561 | // do a tiny bit of precessing |
3562 | if ( tga_image_type >= 8 ) |
3563 | { |
3564 | tga_image_type -= 8; |
3565 | tga_is_RLE = 1; |
3566 | } |
3567 | /* int tga_alpha_bits = tga_inverted & 15; */ |
3568 | tga_inverted = 1 - ((tga_inverted >> 5) & 1); |
3569 | |
3570 | // error check |
3571 | if ( //(tga_indexed) || |
3572 | (tga_width < 1) || (tga_height < 1) || |
3573 | (tga_image_type < 1) || (tga_image_type > 3) || |
3574 | ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) && |
3575 | (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32)) |
3576 | ) |
3577 | { |
3578 | return NULL; |
3579 | } |
3580 | |
3581 | // If I'm paletted, then I'll use the number of bits from the palette |
3582 | if ( tga_indexed ) |
3583 | { |
3584 | tga_bits_per_pixel = tga_palette_bits; |
3585 | } |
3586 | |
3587 | // tga info |
3588 | *x = tga_width; |
3589 | *y = tga_height; |
3590 | if ( (req_comp < 1) || (req_comp > 4) ) |
3591 | { |
3592 | // just use whatever the file was |
3593 | req_comp = tga_bits_per_pixel / 8; |
3594 | *comp = req_comp; |
3595 | } else |
3596 | { |
3597 | // force a new number of components |
3598 | *comp = tga_bits_per_pixel/8; |
3599 | } |
3600 | tga_data = MALLOC( tga_width * tga_height * req_comp ); |
3601 | |
3602 | // skip to the data's starting position (offset usually = 0) |
3603 | skip(s, tga_offset ); |
3604 | // do I need to load a palette? |
3605 | if ( tga_indexed ) |
3606 | { |
3607 | // any data to skip? (offset usually = 0) |
3608 | skip(s, tga_palette_start ); |
3609 | // load the palette |
3610 | tga_palette = MALLOC( tga_palette_len * tga_palette_bits / 8 ); |
3611 | if (!getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) |
3612 | return NULL; |
3613 | } |
3614 | // load the data |
3615 | trans_data[0] = trans_data[1] = trans_data[2] = trans_data[3] = 0; |
3616 | for (i=0; i < tga_width * tga_height; ++i) |
3617 | { |
3618 | // if I'm in RLE mode, do I need to get a RLE chunk? |
3619 | if ( tga_is_RLE ) |
3620 | { |
3621 | if ( RLE_count == 0 ) |
3622 | { |
3623 | // yep, get the next byte as a RLE command |
3624 | int RLE_cmd = get8u(s); |
3625 | RLE_count = 1 + (RLE_cmd & 127); |
3626 | RLE_repeating = RLE_cmd >> 7; |
3627 | read_next_pixel = 1; |
3628 | } else if ( !RLE_repeating ) |
3629 | { |
3630 | read_next_pixel = 1; |
3631 | } |
3632 | } else |
3633 | { |
3634 | read_next_pixel = 1; |
3635 | } |
3636 | // OK, if I need to read a pixel, do it now |
3637 | if ( read_next_pixel ) |
3638 | { |
3639 | // load however much data we did have |
3640 | if ( tga_indexed ) |
3641 | { |
3642 | // read in 1 byte, then perform the lookup |
3643 | int pal_idx = get8u(s); |
3644 | if ( pal_idx >= tga_palette_len ) |
3645 | { |
3646 | // invalid index |
3647 | pal_idx = 0; |
3648 | } |
3649 | pal_idx *= tga_bits_per_pixel / 8; |
3650 | for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
3651 | { |
3652 | raw_data[j] = tga_palette[pal_idx+j]; |
3653 | } |
3654 | } else |
3655 | { |
3656 | // read in the data raw |
3657 | for (j = 0; j*8 < tga_bits_per_pixel; ++j) |
3658 | { |
3659 | raw_data[j] = get8u(s); |
3660 | } |
3661 | } |
3662 | // convert raw to the intermediate format |
3663 | switch (tga_bits_per_pixel) |
3664 | { |
3665 | case 8: |
3666 | // Luminous => RGBA |
3667 | trans_data[0] = raw_data[0]; |
3668 | trans_data[1] = raw_data[0]; |
3669 | trans_data[2] = raw_data[0]; |
3670 | trans_data[3] = 255; |
3671 | break; |
3672 | case 16: |
3673 | // Luminous,Alpha => RGBA |
3674 | trans_data[0] = raw_data[0]; |
3675 | trans_data[1] = raw_data[0]; |
3676 | trans_data[2] = raw_data[0]; |
3677 | trans_data[3] = raw_data[1]; |
3678 | break; |
3679 | case 24: |
3680 | // BGR => RGBA |
3681 | trans_data[0] = raw_data[2]; |
3682 | trans_data[1] = raw_data[1]; |
3683 | trans_data[2] = raw_data[0]; |
3684 | trans_data[3] = 255; |
3685 | break; |
3686 | case 32: |
3687 | // BGRA => RGBA |
3688 | trans_data[0] = raw_data[2]; |
3689 | trans_data[1] = raw_data[1]; |
3690 | trans_data[2] = raw_data[0]; |
3691 | trans_data[3] = raw_data[3]; |
3692 | break; |
3693 | } |
3694 | // clear the reading flag for the next pixel |
3695 | read_next_pixel = 0; |
3696 | } // end of reading a pixel |
3697 | // convert to final format |
3698 | switch (req_comp) |
3699 | { |
3700 | case 1: |
3701 | // RGBA => Luminance |
3702 | tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]); |
3703 | break; |
3704 | case 2: |
3705 | // RGBA => Luminance,Alpha |
3706 | tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]); |
3707 | tga_data[i*req_comp+1] = trans_data[3]; |
3708 | break; |
3709 | case 3: |
3710 | // RGBA => RGB |
3711 | tga_data[i*req_comp+0] = trans_data[0]; |
3712 | tga_data[i*req_comp+1] = trans_data[1]; |
3713 | tga_data[i*req_comp+2] = trans_data[2]; |
3714 | break; |
3715 | case 4: |
3716 | // RGBA => RGBA |
3717 | tga_data[i*req_comp+0] = trans_data[0]; |
3718 | tga_data[i*req_comp+1] = trans_data[1]; |
3719 | tga_data[i*req_comp+2] = trans_data[2]; |
3720 | tga_data[i*req_comp+3] = trans_data[3]; |
3721 | break; |
3722 | } |
3723 | // in case we're in RLE mode, keep counting down |
3724 | --RLE_count; |
3725 | } |
3726 | // do I need to invert the image? |
3727 | if ( tga_inverted ) |
3728 | { |
3729 | for (j = 0; j*2 < tga_height; ++j) |
3730 | { |
3731 | int index1 = j * tga_width * req_comp; |
3732 | int index2 = (tga_height - 1 - j) * tga_width * req_comp; |
3733 | for (i = tga_width * req_comp; i > 0; --i) |
3734 | { |
3735 | unsigned char temp = tga_data[index1]; |
3736 | tga_data[index1] = tga_data[index2]; |
3737 | tga_data[index2] = temp; |
3738 | ++index1; |
3739 | ++index2; |
3740 | } |
3741 | } |
3742 | } |
3743 | // clear my palette, if I had one |
3744 | if ( tga_palette != NULL ) |
3745 | { |
3746 | FREE( tga_palette ); |
3747 | } |
3748 | // the things I do to get rid of an error message, and yet keep |
3749 | // Microsoft's C compilers happy... [8^( |
3750 | tga_palette_start = tga_palette_len = tga_palette_bits = |
3751 | tga_x_origin = tga_y_origin = 0; |
3752 | // OK, done |
3753 | return tga_data; |
3754 | } |
3755 | |
3756 | #ifndef STBI_NO_STDIO |
3757 | stbi_uc *stbi_tga_load (char const *filename, int *x, int *y, int *comp, int req_comp) |
3758 | { |
3759 | stbi_uc *data; |
3760 | FILE *f = fopen(filename, "rb" ); |
3761 | if (!f) return NULL; |
3762 | data = stbi_tga_load_from_file(f, x,y,comp,req_comp); |
3763 | fclose(f); |
3764 | return data; |
3765 | } |
3766 | |
3767 | stbi_uc *stbi_tga_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) |
3768 | { |
3769 | stbi s; |
3770 | start_file(&s, f); |
3771 | return tga_load(&s, x,y,comp,req_comp); |
3772 | } |
3773 | #endif |
3774 | |
3775 | stbi_uc *stbi_tga_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
3776 | { |
3777 | stbi s; |
3778 | start_mem(&s, buffer, len); |
3779 | return tga_load(&s, x,y,comp,req_comp); |
3780 | } |
3781 | |
3782 | |
3783 | // ************************************************************************************************* |
3784 | // Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB |
3785 | |
3786 | static int psd_test(stbi *s) |
3787 | { |
3788 | if (get32(s) != 0x38425053) return 0; // "8BPS" |
3789 | else return 1; |
3790 | } |
3791 | |
3792 | #ifndef STBI_NO_STDIO |
3793 | int stbi_psd_test_file(FILE *f) |
3794 | { |
3795 | stbi s; |
3796 | int r,n = ftell(f); |
3797 | start_file(&s, f); |
3798 | r = psd_test(&s); |
3799 | fseek(f,n,SEEK_SET); |
3800 | return r; |
3801 | } |
3802 | #endif |
3803 | |
3804 | int stbi_psd_test_memory(stbi_uc const *buffer, int len) |
3805 | { |
3806 | stbi s; |
3807 | start_mem(&s, buffer, len); |
3808 | return psd_test(&s); |
3809 | } |
3810 | |
3811 | static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp) |
3812 | { |
3813 | int pixelCount; |
3814 | int channelCount, compression; |
3815 | int channel, i, count, len; |
3816 | int w,h; |
3817 | uint8 *out; |
3818 | |
3819 | // Check identifier |
3820 | if (get32(s) != 0x38425053) // "8BPS" |
3821 | return epuc("not PSD" , "Corrupt PSD image" ); |
3822 | |
3823 | // Check file type version. |
3824 | if (get16(s) != 1) |
3825 | return epuc("wrong version" , "Unsupported version of PSD image" ); |
3826 | |
3827 | // Skip 6 reserved bytes. |
3828 | skip(s, 6 ); |
3829 | |
3830 | // Read the number of channels (R, G, B, A, etc). |
3831 | channelCount = get16(s); |
3832 | if (channelCount < 0 || channelCount > 16) |
3833 | return epuc("wrong channel count" , "Unsupported number of channels in PSD image" ); |
3834 | |
3835 | // Read the rows and columns of the image. |
3836 | h = get32(s); |
3837 | w = get32(s); |
3838 | |
3839 | // Make sure the depth is 8 bits. |
3840 | if (get16(s) != 8) |
3841 | return epuc("unsupported bit depth" , "PSD bit depth is not 8 bit" ); |
3842 | |
3843 | // Make sure the color mode is RGB. |
3844 | // Valid options are: |
3845 | // 0: Bitmap |
3846 | // 1: Grayscale |
3847 | // 2: Indexed color |
3848 | // 3: RGB color |
3849 | // 4: CMYK color |
3850 | // 7: Multichannel |
3851 | // 8: Duotone |
3852 | // 9: Lab color |
3853 | if (get16(s) != 3) |
3854 | return epuc("wrong color format" , "PSD is not in RGB color format" ); |
3855 | |
3856 | // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.) |
3857 | skip(s,get32(s) ); |
3858 | |
3859 | // Skip the image resources. (resolution, pen tool paths, etc) |
3860 | skip(s, get32(s) ); |
3861 | |
3862 | // Skip the reserved data. |
3863 | skip(s, get32(s) ); |
3864 | |
3865 | // Find out if the data is compressed. |
3866 | // Known values: |
3867 | // 0: no compression |
3868 | // 1: RLE compressed |
3869 | compression = get16(s); |
3870 | if (compression > 1) |
3871 | return epuc("bad compression" , "PSD has an unknown compression format" ); |
3872 | |
3873 | // Create the destination image. |
3874 | out = MALLOC(4 * w*h); |
3875 | if (!out) return epuc("outofmem" , "Out of memory" ); |
3876 | pixelCount = w*h; |
3877 | |
3878 | // Initialize the data to zero. |
3879 | //memset( out, 0, pixelCount * 4 ); |
3880 | |
3881 | // Finally, the image data. |
3882 | if (compression) { |
3883 | // RLE as used by .PSD and .TIFF |
3884 | // Loop until you get the number of unpacked bytes you are expecting: |
3885 | // Read the next source byte into n. |
3886 | // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally. |
3887 | // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times. |
3888 | // Else if n is 128, noop. |
3889 | // Endloop |
3890 | |
3891 | // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data, |
3892 | // which we're going to just skip. |
3893 | skip(s, h * channelCount * 2 ); |
3894 | |
3895 | // Read the RLE data by channel. |
3896 | for (channel = 0; channel < 4; channel++) { |
3897 | uint8 *p; |
3898 | |
3899 | p = out+channel; |
3900 | if (channel >= channelCount) { |
3901 | // Fill this channel with default data. |
3902 | for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4; |
3903 | } else { |
3904 | // Read the RLE data. |
3905 | count = 0; |
3906 | while (count < pixelCount) { |
3907 | len = get8(s); |
3908 | if (len == 128) { |
3909 | // No-op. |
3910 | } else if (len < 128) { |
3911 | // Copy next len+1 bytes literally. |
3912 | len++; |
3913 | count += len; |
3914 | while (len) { |
3915 | *p = get8u(s); |
3916 | p += 4; |
3917 | len--; |
3918 | } |
3919 | } else if (len > 128) { |
3920 | uint8 val; |
3921 | // Next -len+1 bytes in the dest are replicated from next source byte. |
3922 | // (Interpret len as a negative 8-bit int.) |
3923 | len ^= 0x0FF; |
3924 | len += 2; |
3925 | val = get8u(s); |
3926 | count += len; |
3927 | while (len) { |
3928 | *p = val; |
3929 | p += 4; |
3930 | len--; |
3931 | } |
3932 | } |
3933 | } |
3934 | } |
3935 | } |
3936 | |
3937 | } else { |
3938 | // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...) |
3939 | // where each channel consists of an 8-bit value for each pixel in the image. |
3940 | |
3941 | // Read the data by channel. |
3942 | for (channel = 0; channel < 4; channel++) { |
3943 | uint8 *p; |
3944 | |
3945 | p = out + channel; |
3946 | if (channel > channelCount) { |
3947 | // Fill this channel with default data. |
3948 | for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4; |
3949 | } else { |
3950 | // Read the data. |
3951 | for (i = 0; i < pixelCount; i++) |
3952 | *p = get8u(s), p += 4; |
3953 | } |
3954 | } |
3955 | } |
3956 | |
3957 | if (req_comp && req_comp != 4) { |
3958 | out = convert_format(out, 4, req_comp, w, h); |
3959 | if (out == NULL) return out; // convert_format frees input on failure |
3960 | } |
3961 | |
3962 | if (comp) *comp = channelCount; |
3963 | *y = h; |
3964 | *x = w; |
3965 | |
3966 | return out; |
3967 | } |
3968 | |
3969 | #ifndef STBI_NO_STDIO |
3970 | stbi_uc *stbi_psd_load(char const *filename, int *x, int *y, int *comp, int req_comp) |
3971 | { |
3972 | stbi_uc *data; |
3973 | FILE *f = fopen(filename, "rb" ); |
3974 | if (!f) return NULL; |
3975 | data = stbi_psd_load_from_file(f, x,y,comp,req_comp); |
3976 | fclose(f); |
3977 | return data; |
3978 | } |
3979 | |
3980 | stbi_uc *stbi_psd_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
3981 | { |
3982 | stbi s; |
3983 | start_file(&s, f); |
3984 | return psd_load(&s, x,y,comp,req_comp); |
3985 | } |
3986 | #endif |
3987 | |
3988 | stbi_uc *stbi_psd_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
3989 | { |
3990 | stbi s; |
3991 | start_mem(&s, buffer, len); |
3992 | return psd_load(&s, x,y,comp,req_comp); |
3993 | } |
3994 | |
3995 | // ************************************************************************************************* |
3996 | // Softimage PIC loader |
3997 | // by Tom Seddon |
3998 | // |
3999 | // See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format |
4000 | // See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/ |
4001 | |
4002 | static int pic_is4(stbi *s,const char *str) |
4003 | { |
4004 | int i; |
4005 | for (i=0; i<4; ++i) |
4006 | if (get8(s) != (stbi_uc)str[i]) |
4007 | return 0; |
4008 | |
4009 | return 1; |
4010 | } |
4011 | |
4012 | static int pic_test(stbi *s) |
4013 | { |
4014 | int i; |
4015 | |
4016 | if (!pic_is4(s,"\x53\x80\xF6\x34" )) |
4017 | return 0; |
4018 | |
4019 | for(i=0;i<84;++i) |
4020 | get8(s); |
4021 | |
4022 | if (!pic_is4(s,"PICT" )) |
4023 | return 0; |
4024 | |
4025 | return 1; |
4026 | } |
4027 | |
4028 | typedef struct |
4029 | { |
4030 | stbi_uc size,type,channel; |
4031 | } pic_packet_t; |
4032 | |
4033 | static stbi_uc *pic_readval(stbi *s, int channel, stbi_uc *dest) |
4034 | { |
4035 | int mask=0x80, i; |
4036 | |
4037 | for (i=0; i<4; ++i, mask>>=1) { |
4038 | if (channel & mask) { |
4039 | if (at_eof(s)) return epuc("bad file" ,"PIC file too short" ); |
4040 | dest[i]=get8u(s); |
4041 | } |
4042 | } |
4043 | |
4044 | return dest; |
4045 | } |
4046 | |
4047 | static void pic_copyval(int channel,stbi_uc *dest,const stbi_uc *src) |
4048 | { |
4049 | int mask=0x80,i; |
4050 | |
4051 | for (i=0;i<4; ++i, mask>>=1) |
4052 | if (channel&mask) |
4053 | dest[i]=src[i]; |
4054 | } |
4055 | |
4056 | static stbi_uc *pic_load2(stbi *s,int width,int height,int *comp, stbi_uc *result) |
4057 | { |
4058 | int act_comp=0,num_packets=0,y,chained; |
4059 | pic_packet_t packets[10]; |
4060 | |
4061 | // this will (should...) cater for even some bizarre stuff like having data |
4062 | // for the same channel in multiple packets. |
4063 | do { |
4064 | pic_packet_t *packet; |
4065 | |
4066 | if (num_packets==sizeof(packets)/sizeof(packets[0])) |
4067 | return epuc("bad format" ,"too many packets" ); |
4068 | |
4069 | packet = &packets[num_packets++]; |
4070 | |
4071 | chained = get8(s); |
4072 | packet->size = get8u(s); |
4073 | packet->type = get8u(s); |
4074 | packet->channel = get8u(s); |
4075 | |
4076 | act_comp |= packet->channel; |
4077 | |
4078 | if (at_eof(s)) return epuc("bad file" ,"file too short (reading packets)" ); |
4079 | if (packet->size != 8) return epuc("bad format" ,"packet isn't 8bpp" ); |
4080 | } while (chained); |
4081 | |
4082 | *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel? |
4083 | |
4084 | for(y=0; y<height; ++y) { |
4085 | int packet_idx; |
4086 | |
4087 | for(packet_idx=0; packet_idx < num_packets; ++packet_idx) { |
4088 | pic_packet_t *packet = &packets[packet_idx]; |
4089 | stbi_uc *dest = result+y*width*4; |
4090 | |
4091 | switch (packet->type) { |
4092 | default: |
4093 | return epuc("bad format" ,"packet has bad compression type" ); |
4094 | |
4095 | case 0: {//uncompressed |
4096 | int x; |
4097 | |
4098 | for(x=0;x<width;++x, dest+=4) |
4099 | if (!pic_readval(s,packet->channel,dest)) |
4100 | return 0; |
4101 | break; |
4102 | } |
4103 | |
4104 | case 1://Pure RLE |
4105 | { |
4106 | int left=width, i; |
4107 | |
4108 | while (left>0) { |
4109 | stbi_uc count,value[4]; |
4110 | |
4111 | count=get8u(s); |
4112 | if (at_eof(s)) return epuc("bad file" ,"file too short (pure read count)" ); |
4113 | |
4114 | if (count > left) |
4115 | count = (uint8) left; |
4116 | |
4117 | if (!pic_readval(s,packet->channel,value)) return 0; |
4118 | |
4119 | for(i=0; i<count; ++i,dest+=4) |
4120 | pic_copyval(packet->channel,dest,value); |
4121 | left -= count; |
4122 | } |
4123 | } |
4124 | break; |
4125 | |
4126 | case 2: {//Mixed RLE |
4127 | int left=width; |
4128 | while (left>0) { |
4129 | int count = get8(s), i; |
4130 | if (at_eof(s)) return epuc("bad file" ,"file too short (mixed read count)" ); |
4131 | |
4132 | if (count >= 128) { // Repeated |
4133 | stbi_uc value[4]; |
4134 | |
4135 | if (count==128) |
4136 | count = get16(s); |
4137 | else |
4138 | count -= 127; |
4139 | if (count > left) |
4140 | return epuc("bad file" ,"scanline overrun" ); |
4141 | |
4142 | if (!pic_readval(s,packet->channel,value)) |
4143 | return 0; |
4144 | |
4145 | for(i=0;i<count;++i, dest += 4) |
4146 | pic_copyval(packet->channel,dest,value); |
4147 | } else { // Raw |
4148 | ++count; |
4149 | if (count>left) return epuc("bad file" ,"scanline overrun" ); |
4150 | |
4151 | for(i=0;i<count;++i, dest+=4) |
4152 | if (!pic_readval(s,packet->channel,dest)) |
4153 | return 0; |
4154 | } |
4155 | left-=count; |
4156 | } |
4157 | break; |
4158 | } |
4159 | } |
4160 | } |
4161 | } |
4162 | |
4163 | return result; |
4164 | } |
4165 | |
4166 | static stbi_uc *pic_load(stbi *s,int *px,int *py,int *comp,int req_comp) |
4167 | { |
4168 | stbi_uc *result; |
4169 | int i, x,y; |
4170 | |
4171 | for (i=0; i<92; ++i) |
4172 | get8(s); |
4173 | |
4174 | x = get16(s); |
4175 | y = get16(s); |
4176 | if (at_eof(s)) return epuc("bad file" ,"file too short (pic header)" ); |
4177 | if ((1 << 28) / x < y) return epuc("too large" , "Image too large to decode" ); |
4178 | |
4179 | get32(s); //skip `ratio' |
4180 | get16(s); //skip `fields' |
4181 | get16(s); //skip `pad' |
4182 | |
4183 | // intermediate buffer is RGBA |
4184 | result = MALLOC(x*y*4); |
4185 | memset(result, 0xff, x*y*4); |
4186 | |
4187 | if (!pic_load2(s,x,y,comp, result)) { |
4188 | FREE(result); |
4189 | result=0; |
4190 | } |
4191 | *px = x; |
4192 | *py = y; |
4193 | if (req_comp == 0) req_comp = *comp; |
4194 | result=convert_format(result,4,req_comp,x,y); |
4195 | |
4196 | return result; |
4197 | } |
4198 | |
4199 | int stbi_pic_test_memory(stbi_uc const *buffer, int len) |
4200 | { |
4201 | stbi s; |
4202 | start_mem(&s,buffer,len); |
4203 | return pic_test(&s); |
4204 | } |
4205 | |
4206 | stbi_uc *stbi_pic_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
4207 | { |
4208 | stbi s; |
4209 | start_mem(&s,buffer,len); |
4210 | return pic_load(&s,x,y,comp,req_comp); |
4211 | } |
4212 | |
4213 | #ifndef STBI_NO_STDIO |
4214 | int stbi_pic_test_file(FILE *f) |
4215 | { |
4216 | int result; |
4217 | long l = ftell(f); |
4218 | stbi s; |
4219 | start_file(&s,f); |
4220 | result = pic_test(&s); |
4221 | fseek(f,l,SEEK_SET); |
4222 | return result; |
4223 | } |
4224 | |
4225 | stbi_uc *stbi_pic_load(char const *filename,int *x, int *y, int *comp, int req_comp) |
4226 | { |
4227 | stbi_uc *result; |
4228 | FILE *f=fopen(filename,"rb" ); |
4229 | if (!f) return 0; |
4230 | result = stbi_pic_load_from_file(f,x,y,comp,req_comp); |
4231 | fclose(f); |
4232 | return result; |
4233 | } |
4234 | |
4235 | stbi_uc *stbi_pic_load_from_file(FILE *f,int *x, int *y, int *comp, int req_comp) |
4236 | { |
4237 | stbi s; |
4238 | start_file(&s,f); |
4239 | return pic_load(&s,x,y,comp,req_comp); |
4240 | } |
4241 | #endif |
4242 | |
4243 | // ************************************************************************************************* |
4244 | // GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb |
4245 | typedef struct stbi_gif_lzw_struct { |
4246 | int16 prefix; |
4247 | uint8 first; |
4248 | uint8 suffix; |
4249 | } stbi_gif_lzw; |
4250 | |
4251 | typedef struct stbi_gif_struct |
4252 | { |
4253 | int w,h; |
4254 | stbi_uc *out; // output buffer (always 4 components) |
4255 | int flags, bgindex, ratio, transparent, eflags; |
4256 | uint8 pal[256][4]; |
4257 | uint8 lpal[256][4]; |
4258 | stbi_gif_lzw codes[4096]; |
4259 | uint8 *color_table; |
4260 | int parse, step; |
4261 | int lflags; |
4262 | int start_x, start_y; |
4263 | int max_x, max_y; |
4264 | int cur_x, cur_y; |
4265 | int line_size; |
4266 | } stbi_gif; |
4267 | |
4268 | static int gif_test(stbi *s) |
4269 | { |
4270 | int sz; |
4271 | if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') return 0; |
4272 | sz = get8(s); |
4273 | if (sz != '9' && sz != '7') return 0; |
4274 | if (get8(s) != 'a') return 0; |
4275 | return 1; |
4276 | } |
4277 | |
4278 | #ifndef STBI_NO_STDIO |
4279 | int stbi_gif_test_file (FILE *f) |
4280 | { |
4281 | stbi s; |
4282 | int r,n = ftell(f); |
4283 | start_file(&s,f); |
4284 | r = gif_test(&s); |
4285 | fseek(f,n,SEEK_SET); |
4286 | return r; |
4287 | } |
4288 | #endif |
4289 | |
4290 | int stbi_gif_test_memory (stbi_uc const *buffer, int len) |
4291 | { |
4292 | stbi s; |
4293 | start_mem(&s, buffer, len); |
4294 | return gif_test(&s); |
4295 | } |
4296 | |
4297 | static void stbi_gif_parse_colortable(stbi *s, uint8 pal[256][4], int num_entries, int transp) |
4298 | { |
4299 | int i; |
4300 | for (i=0; i < num_entries; ++i) { |
4301 | pal[i][2] = get8u(s); |
4302 | pal[i][1] = get8u(s); |
4303 | pal[i][0] = get8u(s); |
4304 | pal[i][3] = transp ? 0 : 255; |
4305 | } |
4306 | } |
4307 | |
4308 | static int (stbi *s, stbi_gif *g, int *comp, int is_info) |
4309 | { |
4310 | uint8 ver; |
4311 | if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') |
4312 | return e("not GIF" , "Corrupt GIF" ); |
4313 | |
4314 | ver = get8u(s); |
4315 | if (ver != '7' && ver != '9') return e("not GIF" , "Corrupt GIF" ); |
4316 | if (get8(s) != 'a') return e("not GIF" , "Corrupt GIF" ); |
4317 | |
4318 | failure_reason = "" ; |
4319 | g->w = get16le(s); |
4320 | g->h = get16le(s); |
4321 | g->flags = get8(s); |
4322 | g->bgindex = get8(s); |
4323 | g->ratio = get8(s); |
4324 | g->transparent = -1; |
4325 | |
4326 | if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments |
4327 | |
4328 | if (is_info) return 1; |
4329 | |
4330 | if (g->flags & 0x80) |
4331 | stbi_gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1); |
4332 | |
4333 | return 1; |
4334 | } |
4335 | |
4336 | static int stbi_gif_info_raw(stbi *s, int *x, int *y, int *comp) |
4337 | { |
4338 | stbi_gif g; |
4339 | if (!stbi_gif_header(s, &g, comp, 1)) return 0; |
4340 | if (x) *x = g.w; |
4341 | if (y) *y = g.h; |
4342 | return 1; |
4343 | } |
4344 | |
4345 | static void stbi_out_gif_code(stbi_gif *g, uint16 code) |
4346 | { |
4347 | uint8 *p, *c; |
4348 | |
4349 | // recurse to decode the prefixes, since the linked-list is backwards, |
4350 | // and working backwards through an interleaved image would be nasty |
4351 | if (g->codes[code].prefix >= 0) |
4352 | stbi_out_gif_code(g, g->codes[code].prefix); |
4353 | |
4354 | if (g->cur_y >= g->max_y) return; |
4355 | |
4356 | p = &g->out[g->cur_x + g->cur_y]; |
4357 | c = &g->color_table[g->codes[code].suffix * 4]; |
4358 | |
4359 | if (c[3] >= 128) { |
4360 | p[0] = c[2]; |
4361 | p[1] = c[1]; |
4362 | p[2] = c[0]; |
4363 | p[3] = c[3]; |
4364 | } |
4365 | g->cur_x += 4; |
4366 | |
4367 | if (g->cur_x >= g->max_x) { |
4368 | g->cur_x = g->start_x; |
4369 | g->cur_y += g->step; |
4370 | |
4371 | while (g->cur_y >= g->max_y && g->parse > 0) { |
4372 | g->step = (1 << g->parse) * g->line_size; |
4373 | g->cur_y = g->start_y + (g->step >> 1); |
4374 | --g->parse; |
4375 | } |
4376 | } |
4377 | } |
4378 | |
4379 | static uint8 *stbi_process_gif_raster(stbi *s, stbi_gif *g) |
4380 | { |
4381 | uint8 lzw_cs; |
4382 | int32 len, code; |
4383 | uint32 first; |
4384 | int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear; |
4385 | stbi_gif_lzw *p; |
4386 | |
4387 | lzw_cs = get8u(s); |
4388 | clear = 1 << lzw_cs; |
4389 | first = 1; |
4390 | codesize = lzw_cs + 1; |
4391 | codemask = (1 << codesize) - 1; |
4392 | bits = 0; |
4393 | valid_bits = 0; |
4394 | for (code = 0; code < clear; code++) { |
4395 | g->codes[code].prefix = -1; |
4396 | g->codes[code].first = (uint8) code; |
4397 | g->codes[code].suffix = (uint8) code; |
4398 | } |
4399 | |
4400 | // support no starting clear code |
4401 | avail = clear+2; |
4402 | oldcode = -1; |
4403 | |
4404 | len = 0; |
4405 | for(;;) { |
4406 | if (valid_bits < codesize) { |
4407 | if (len == 0) { |
4408 | len = get8(s); // start new block |
4409 | if (len == 0) |
4410 | return g->out; |
4411 | } |
4412 | --len; |
4413 | bits |= (int32) get8(s) << valid_bits; |
4414 | valid_bits += 8; |
4415 | } else { |
4416 | code = bits & codemask; |
4417 | bits >>= codesize; |
4418 | valid_bits -= codesize; |
4419 | // @OPTIMIZE: is there some way we can accelerate the non-clear path? |
4420 | if (code == clear) { // clear code |
4421 | codesize = lzw_cs + 1; |
4422 | codemask = (1 << codesize) - 1; |
4423 | avail = clear + 2; |
4424 | oldcode = -1; |
4425 | first = 0; |
4426 | } else if (code == clear + 1) { // end of stream code |
4427 | skip(s, len); |
4428 | while ((len = get8(s)) > 0) |
4429 | skip(s,len); |
4430 | return g->out; |
4431 | } else if (code <= avail) { |
4432 | if (first) return epuc("no clear code" , "Corrupt GIF" ); |
4433 | |
4434 | if (oldcode >= 0) { |
4435 | p = &g->codes[avail++]; |
4436 | if (avail > 4096) return epuc("too many codes" , "Corrupt GIF" ); |
4437 | p->prefix = (int16) oldcode; |
4438 | p->first = g->codes[oldcode].first; |
4439 | p->suffix = (code == avail) ? p->first : g->codes[code].first; |
4440 | } else if (code == avail) |
4441 | return epuc("illegal code in raster" , "Corrupt GIF" ); |
4442 | |
4443 | stbi_out_gif_code(g, (uint16) code); |
4444 | |
4445 | if ((avail & codemask) == 0 && avail <= 0x0FFF) { |
4446 | codesize++; |
4447 | codemask = (1 << codesize) - 1; |
4448 | } |
4449 | |
4450 | oldcode = code; |
4451 | } else { |
4452 | return epuc("illegal code in raster" , "Corrupt GIF" ); |
4453 | } |
4454 | } |
4455 | } |
4456 | } |
4457 | |
4458 | static void stbi_fill_gif_background(stbi_gif *g) |
4459 | { |
4460 | int i; |
4461 | uint8 *c = g->pal[g->bgindex]; |
4462 | // @OPTIMIZE: write a dword at a time |
4463 | for (i = 0; i < g->w * g->h * 4; i += 4) { |
4464 | uint8 *p = &g->out[i]; |
4465 | p[0] = c[2]; |
4466 | p[1] = c[1]; |
4467 | p[2] = c[0]; |
4468 | p[3] = c[3]; |
4469 | } |
4470 | } |
4471 | |
4472 | // this function is designed to support animated gifs, although stb_image doesn't support it |
4473 | static uint8 *stbi_gif_load_next(stbi *s, stbi_gif *g, int *comp, int req_comp) |
4474 | { |
4475 | int i; |
4476 | uint8 *old_out = 0; |
4477 | |
4478 | if (g->out == 0) { |
4479 | if (!stbi_gif_header(s, g, comp,0)) return 0; // failure_reason set by stbi_gif_header |
4480 | g->out = MALLOC(4 * g->w * g->h); |
4481 | if (g->out == 0) return epuc("outofmem" , "Out of memory" ); |
4482 | stbi_fill_gif_background(g); |
4483 | } else { |
4484 | // animated-gif-only path |
4485 | if (((g->eflags & 0x1C) >> 2) == 3) { |
4486 | old_out = g->out; |
4487 | g->out = MALLOC(4 * g->w * g->h); |
4488 | if (g->out == 0) return epuc("outofmem" , "Out of memory" ); |
4489 | memcpy(g->out, old_out, g->w*g->h*4); |
4490 | } |
4491 | } |
4492 | |
4493 | for (;;) { |
4494 | switch (get8(s)) { |
4495 | case 0x2C: /* Image Descriptor */ |
4496 | { |
4497 | int32 x, y, w, h; |
4498 | uint8 *o; |
4499 | |
4500 | x = get16le(s); |
4501 | y = get16le(s); |
4502 | w = get16le(s); |
4503 | h = get16le(s); |
4504 | if (((x + w) > (g->w)) || ((y + h) > (g->h))) |
4505 | return epuc("bad Image Descriptor" , "Corrupt GIF" ); |
4506 | |
4507 | g->line_size = g->w * 4; |
4508 | g->start_x = x * 4; |
4509 | g->start_y = y * g->line_size; |
4510 | g->max_x = g->start_x + w * 4; |
4511 | g->max_y = g->start_y + h * g->line_size; |
4512 | g->cur_x = g->start_x; |
4513 | g->cur_y = g->start_y; |
4514 | |
4515 | g->lflags = get8(s); |
4516 | |
4517 | if (g->lflags & 0x40) { |
4518 | g->step = 8 * g->line_size; // first interlaced spacing |
4519 | g->parse = 3; |
4520 | } else { |
4521 | g->step = g->line_size; |
4522 | g->parse = 0; |
4523 | } |
4524 | |
4525 | if (g->lflags & 0x80) { |
4526 | stbi_gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1); |
4527 | g->color_table = (uint8 *) g->lpal; |
4528 | } else if (g->flags & 0x80) { |
4529 | for (i=0; i < 256; ++i) // @OPTIMIZE: reset only the previous transparent |
4530 | g->pal[i][3] = 255; |
4531 | if (g->transparent >= 0 && (g->eflags & 0x01)) |
4532 | g->pal[g->transparent][3] = 0; |
4533 | g->color_table = (uint8 *) g->pal; |
4534 | } else |
4535 | return epuc("missing color table" , "Corrupt GIF" ); |
4536 | |
4537 | o = stbi_process_gif_raster(s, g); |
4538 | if (o == NULL) return NULL; |
4539 | |
4540 | if (req_comp && req_comp != 4) |
4541 | o = convert_format(o, 4, req_comp, g->w, g->h); |
4542 | return o; |
4543 | } |
4544 | |
4545 | case 0x21: // Comment Extension. |
4546 | { |
4547 | int len; |
4548 | if (get8(s) == 0xF9) { // Graphic Control Extension. |
4549 | len = get8(s); |
4550 | if (len == 4) { |
4551 | g->eflags = get8(s); |
4552 | get16le(s); // delay |
4553 | g->transparent = get8(s); |
4554 | } else { |
4555 | skip(s, len); |
4556 | break; |
4557 | } |
4558 | } |
4559 | while ((len = get8(s)) != 0) |
4560 | skip(s, len); |
4561 | break; |
4562 | } |
4563 | |
4564 | case 0x3B: // gif stream termination code |
4565 | return (uint8 *) 1; |
4566 | |
4567 | default: |
4568 | return epuc("unknown code" , "Corrupt GIF" ); |
4569 | } |
4570 | } |
4571 | } |
4572 | |
4573 | #ifndef STBI_NO_STDIO |
4574 | stbi_uc *stbi_gif_load (char const *filename, int *x, int *y, int *comp, int req_comp) |
4575 | { |
4576 | uint8 *data; |
4577 | FILE *f = fopen(filename, "rb" ); |
4578 | if (!f) return NULL; |
4579 | data = stbi_gif_load_from_file(f, x,y,comp,req_comp); |
4580 | fclose(f); |
4581 | return data; |
4582 | } |
4583 | |
4584 | stbi_uc *stbi_gif_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp) |
4585 | { |
4586 | uint8 *u = 0; |
4587 | stbi s; |
4588 | stbi_gif g={0}; |
4589 | start_file(&s, f); |
4590 | |
4591 | u = stbi_gif_load_next(&s, &g, comp, req_comp); |
4592 | if (u == (void *) 1) u = 0; // end of animated gif marker |
4593 | if (u) { |
4594 | *x = g.w; |
4595 | *y = g.h; |
4596 | } |
4597 | |
4598 | return u; |
4599 | } |
4600 | #endif |
4601 | |
4602 | stbi_uc *stbi_gif_load_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
4603 | { |
4604 | uint8 *u = 0; |
4605 | stbi s; |
4606 | stbi_gif *pg; |
4607 | |
4608 | #ifdef STBI_SMALL_STACK |
4609 | pg = MALLOC(sizeof(*pg)); |
4610 | if (pg == NULL) |
4611 | return NULL; |
4612 | #else |
4613 | stbi_gif g; |
4614 | pg = &g; |
4615 | #endif |
4616 | |
4617 | memset(pg, 0, sizeof(*pg)); |
4618 | start_mem(&s, buffer, len); |
4619 | u = stbi_gif_load_next(&s, pg, comp, req_comp); |
4620 | if (u == (void *) 1) u = 0; // end of animated gif marker |
4621 | if (u) { |
4622 | *x = pg->w; |
4623 | *y = pg->h; |
4624 | } |
4625 | |
4626 | #ifdef STBI_SMALL_STACK |
4627 | FREE(pg); |
4628 | #endif |
4629 | |
4630 | return u; |
4631 | } |
4632 | |
4633 | #ifndef STBI_NO_STDIO |
4634 | int stbi_gif_info (char const *filename, int *x, int *y, int *comp) |
4635 | { |
4636 | int res; |
4637 | FILE *f = fopen(filename, "rb" ); |
4638 | if (!f) return 0; |
4639 | res = stbi_gif_info_from_file(f, x, y, comp); |
4640 | fclose(f); |
4641 | return res; |
4642 | } |
4643 | |
4644 | int stbi_gif_info_from_file(FILE *f, int *x, int *y, int *comp) |
4645 | { |
4646 | stbi s; |
4647 | int res; |
4648 | long n = ftell(f); |
4649 | start_file(&s, f); |
4650 | res = stbi_gif_info_raw(&s, x, y, comp); |
4651 | fseek(f, n, SEEK_SET); |
4652 | return res; |
4653 | } |
4654 | #endif // !STBI_NO_STDIO |
4655 | |
4656 | int stbi_gif_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) |
4657 | { |
4658 | stbi s; |
4659 | start_mem(&s, buffer, len); |
4660 | return stbi_gif_info_raw(&s, x, y, comp); |
4661 | } |
4662 | |
4663 | |
4664 | |
4665 | |
4666 | // ************************************************************************************************* |
4667 | // Radiance RGBE HDR loader |
4668 | // originally by Nicolas Schulz |
4669 | #ifndef STBI_NO_HDR |
4670 | static int hdr_test(stbi *s) |
4671 | { |
4672 | const char *signature = "#?RADIANCE\n" ; |
4673 | int i; |
4674 | for (i=0; signature[i]; ++i) |
4675 | if (get8(s) != signature[i]) |
4676 | return 0; |
4677 | return 1; |
4678 | } |
4679 | |
4680 | int stbi_hdr_test_memory(stbi_uc const *buffer, int len) |
4681 | { |
4682 | stbi s; |
4683 | start_mem(&s, buffer, len); |
4684 | return hdr_test(&s); |
4685 | } |
4686 | |
4687 | #ifndef STBI_NO_STDIO |
4688 | int stbi_hdr_test_file(FILE *f) |
4689 | { |
4690 | stbi s; |
4691 | int r,n = ftell(f); |
4692 | start_file(&s, f); |
4693 | r = hdr_test(&s); |
4694 | fseek(f,n,SEEK_SET); |
4695 | return r; |
4696 | } |
4697 | #endif |
4698 | |
4699 | #define HDR_BUFLEN 1024 |
4700 | static char *hdr_gettoken(stbi *z, char *buffer) |
4701 | { |
4702 | int len=0; |
4703 | char c = '\0'; |
4704 | |
4705 | c = (char) get8(z); |
4706 | |
4707 | while (!at_eof(z) && c != '\n') { |
4708 | buffer[len++] = c; |
4709 | if (len == HDR_BUFLEN-1) { |
4710 | // flush to end of line |
4711 | while (!at_eof(z) && get8(z) != '\n') |
4712 | ; |
4713 | break; |
4714 | } |
4715 | c = (char) get8(z); |
4716 | } |
4717 | |
4718 | buffer[len] = 0; |
4719 | return buffer; |
4720 | } |
4721 | |
4722 | static void hdr_convert(float *output, stbi_uc *input, int req_comp) |
4723 | { |
4724 | if ( input[3] != 0 ) { |
4725 | float f1; |
4726 | // Exponent |
4727 | f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8)); |
4728 | if (req_comp <= 2) |
4729 | output[0] = (input[0] + input[1] + input[2]) * f1 / 3; |
4730 | else { |
4731 | output[0] = input[0] * f1; |
4732 | output[1] = input[1] * f1; |
4733 | output[2] = input[2] * f1; |
4734 | } |
4735 | if (req_comp == 2) output[1] = 1; |
4736 | if (req_comp == 4) output[3] = 1; |
4737 | } else { |
4738 | switch (req_comp) { |
4739 | case 4: output[3] = 1; /* fallthrough */ |
4740 | case 3: output[0] = output[1] = output[2] = 0; |
4741 | break; |
4742 | case 2: output[1] = 1; /* fallthrough */ |
4743 | case 1: output[0] = 0; |
4744 | break; |
4745 | } |
4746 | } |
4747 | } |
4748 | |
4749 | |
4750 | static float *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp) |
4751 | { |
4752 | char buffer[HDR_BUFLEN]; |
4753 | char *token; |
4754 | int valid = 0; |
4755 | int width, height; |
4756 | stbi_uc *scanline; |
4757 | float *hdr_data; |
4758 | int len; |
4759 | unsigned char count, value; |
4760 | int i, j, k, c1,c2, z; |
4761 | |
4762 | |
4763 | // Check identifier |
4764 | if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE" ) != 0) |
4765 | return epf("not HDR" , "Corrupt HDR image" ); |
4766 | |
4767 | // Parse header |
4768 | for(;;) { |
4769 | token = hdr_gettoken(s,buffer); |
4770 | if (token[0] == 0) break; |
4771 | if (strcmp(token, "FORMAT=32-bit_rle_rgbe" ) == 0) valid = 1; |
4772 | } |
4773 | |
4774 | if (!valid) return epf("unsupported format" , "Unsupported HDR format" ); |
4775 | |
4776 | // Parse width and height |
4777 | // can't use sscanf() if we're not using stdio! |
4778 | token = hdr_gettoken(s,buffer); |
4779 | if (strncmp(token, "-Y " , 3)) return epf("unsupported data layout" , "Unsupported HDR format" ); |
4780 | token += 3; |
4781 | height = strtol(token, &token, 10); |
4782 | while (*token == ' ') ++token; |
4783 | if (strncmp(token, "+X " , 3)) return epf("unsupported data layout" , "Unsupported HDR format" ); |
4784 | token += 3; |
4785 | width = strtol(token, NULL, 10); |
4786 | |
4787 | *x = width; |
4788 | *y = height; |
4789 | |
4790 | *comp = 3; |
4791 | if (req_comp == 0) req_comp = 3; |
4792 | |
4793 | // Read data |
4794 | hdr_data = MALLOC(height * width * req_comp * sizeof(float)); |
4795 | |
4796 | // Load image data |
4797 | // image data is stored as some number of sca |
4798 | if ( width < 8 || width >= 32768) { |
4799 | // Read flat data |
4800 | for (j=0; j < height; ++j) { |
4801 | for (i=0; i < width; ++i) { |
4802 | stbi_uc rgbe[4]; |
4803 | main_decode_loop: |
4804 | getn(s, rgbe, 4); |
4805 | hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp); |
4806 | } |
4807 | } |
4808 | } else { |
4809 | // Read RLE-encoded data |
4810 | scanline = NULL; |
4811 | |
4812 | for (j = 0; j < height; ++j) { |
4813 | c1 = get8(s); |
4814 | c2 = get8(s); |
4815 | len = get8(s); |
4816 | if (c1 != 2 || c2 != 2 || (len & 0x80)) { |
4817 | // not run-length encoded, so we have to actually use THIS data as a decoded |
4818 | // pixel (note this can't be a valid pixel--one of RGB must be >= 128) |
4819 | uint8 rgbe[4]; |
4820 | rgbe[0] = (uint8) c1; |
4821 | rgbe[1] = (uint8) c2; |
4822 | rgbe[2] = (uint8) len; |
4823 | rgbe[3] = (uint8) get8u(s); |
4824 | hdr_convert(hdr_data, rgbe, req_comp); |
4825 | i = 1; |
4826 | j = 0; |
4827 | FREE(scanline); |
4828 | goto main_decode_loop; // yes, this makes no sense |
4829 | } |
4830 | len <<= 8; |
4831 | len |= get8(s); |
4832 | if (len != width) { FREE(hdr_data); FREE(scanline); return epf("invalid decoded scanline length" , "corrupt HDR" ); } |
4833 | if (scanline == NULL) scanline = MALLOC(width * 4); |
4834 | |
4835 | for (k = 0; k < 4; ++k) { |
4836 | i = 0; |
4837 | while (i < width) { |
4838 | count = get8u(s); |
4839 | if (count > 128) { |
4840 | // Run |
4841 | value = get8u(s); |
4842 | count -= 128; |
4843 | for (z = 0; z < count; ++z) |
4844 | scanline[i++ * 4 + k] = value; |
4845 | } else { |
4846 | // Dump |
4847 | for (z = 0; z < count; ++z) |
4848 | scanline[i++ * 4 + k] = get8u(s); |
4849 | } |
4850 | } |
4851 | } |
4852 | for (i=0; i < width; ++i) |
4853 | hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp); |
4854 | } |
4855 | FREE(scanline); |
4856 | } |
4857 | |
4858 | return hdr_data; |
4859 | } |
4860 | |
4861 | #ifndef STBI_NO_STDIO |
4862 | float *stbi_hdr_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp) |
4863 | { |
4864 | stbi s; |
4865 | start_file(&s,f); |
4866 | return hdr_load(&s,x,y,comp,req_comp); |
4867 | } |
4868 | #endif |
4869 | |
4870 | float *stbi_hdr_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp) |
4871 | { |
4872 | stbi s; |
4873 | start_mem(&s,buffer, len); |
4874 | return hdr_load(&s,x,y,comp,req_comp); |
4875 | } |
4876 | |
4877 | #endif // STBI_NO_HDR |
4878 | |
4879 | |
4880 | #ifndef STBI_NO_STDIO |
4881 | int stbi_info(char const *filename, int *x, int *y, int *comp) |
4882 | { |
4883 | FILE *f = fopen(filename, "rb" ); |
4884 | int result; |
4885 | if (!f) return e("can't fopen" , "Unable to open file" ); |
4886 | result = stbi_info_from_file(f, x, y, comp); |
4887 | fclose(f); |
4888 | return result; |
4889 | } |
4890 | |
4891 | int stbi_info_from_file(FILE *f, int *x, int *y, int *comp) |
4892 | { |
4893 | if (stbi_jpeg_info_from_file(f, x, y, comp)) |
4894 | return 1; |
4895 | if (stbi_png_info_from_file(f, x, y, comp)) |
4896 | return 1; |
4897 | if (stbi_gif_info_from_file(f, x, y, comp)) |
4898 | return 1; |
4899 | // @TODO: stbi_bmp_info_from_file |
4900 | // @TODO: stbi_psd_info_from_file |
4901 | #ifndef STBI_NO_HDR |
4902 | // @TODO: stbi_hdr_info_from_file |
4903 | #endif |
4904 | // test tga last because it's a crappy test! |
4905 | if (stbi_tga_info_from_file(f, x, y, comp)) |
4906 | return 1; |
4907 | return e("unknown image type" , "Image not of any known type, or corrupt" ); |
4908 | } |
4909 | #endif // !STBI_NO_STDIO |
4910 | |
4911 | int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp) |
4912 | { |
4913 | if (stbi_jpeg_info_from_memory(buffer, len, x, y, comp)) |
4914 | return 1; |
4915 | if (stbi_png_info_from_memory(buffer, len, x, y, comp)) |
4916 | return 1; |
4917 | if (stbi_gif_info_from_memory(buffer, len, x, y, comp)) |
4918 | return 1; |
4919 | // @TODO: stbi_bmp_info_from_memory |
4920 | // @TODO: stbi_psd_info_from_memory |
4921 | #ifndef STBI_NO_HDR |
4922 | // @TODO: stbi_hdr_info_from_memory |
4923 | #endif |
4924 | // test tga last because it's a crappy test! |
4925 | if (stbi_tga_info_from_memory(buffer, len, x, y, comp)) |
4926 | return 1; |
4927 | return e("unknown image type" , "Image not of any known type, or corrupt" ); |
4928 | } |
4929 | |
4930 | #endif // STBI_HEADER_FILE_ONLY |
4931 | |
4932 | /* |
4933 | revision history: |
4934 | 1.29 (2010-08-16) various warning fixes from Aurelien Pocheville |
4935 | 1.28 (2010-08-01) fix bug in GIF palette transparency (SpartanJ) |
4936 | 1.27 (2010-08-01) |
4937 | cast-to-uint8 to fix warnings |
4938 | 1.26 (2010-07-24) |
4939 | fix bug in file buffering for PNG reported by SpartanJ |
4940 | 1.25 (2010-07-17) |
4941 | refix trans_data warning (Won Chun) |
4942 | 1.24 (2010-07-12) |
4943 | perf improvements reading from files on platforms with lock-heavy fgetc() |
4944 | minor perf improvements for jpeg |
4945 | deprecated type-specific functions so we'll get feedback if they're needed |
4946 | attempt to fix trans_data warning (Won Chun) |
4947 | 1.23 fixed bug in iPhone support |
4948 | 1.22 (2010-07-10) |
4949 | removed image *writing* support |
4950 | removed image *writing* support |
4951 | stbi_info support from Jetro Lauha |
4952 | GIF support from Jean-Marc Lienher |
4953 | iPhone PNG-extensions from James Brown |
4954 | warning-fixes from Nicolas Schulz and Janez Zemva (i.e. Janez (U+017D)emva) |
4955 | 1.21 fix use of 'uint8' in header (reported by jon blow) |
4956 | 1.20 added support for Softimage PIC, by Tom Seddon |
4957 | 1.19 bug in interlaced PNG corruption check (found by ryg) |
4958 | 1.18 2008-08-02 |
4959 | fix a threading bug (local mutable static) |
4960 | 1.17 support interlaced PNG |
4961 | 1.16 major bugfix - convert_format converted one too many pixels |
4962 | 1.15 initialize some fields for thread safety |
4963 | 1.14 fix threadsafe conversion bug |
4964 | header-file-only version (#define STBI_HEADER_FILE_ONLY before including) |
4965 | 1.13 threadsafe |
4966 | 1.12 const qualifiers in the API |
4967 | 1.11 Support installable IDCT, colorspace conversion routines |
4968 | 1.10 Fixes for 64-bit (don't use "unsigned long") |
4969 | optimized upsampling by Fabian "ryg" Giesen |
4970 | 1.09 Fix format-conversion for PSD code (bad global variables!) |
4971 | 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz |
4972 | 1.07 attempt to fix C++ warning/errors again |
4973 | 1.06 attempt to fix C++ warning/errors again |
4974 | 1.05 fix TGA loading to return correct *comp and use good luminance calc |
4975 | 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free |
4976 | 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR |
4977 | 1.02 support for (subset of) HDR files, float interface for preferred access to them |
4978 | 1.01 fix bug: possible bug in handling right-side up bmps... not sure |
4979 | fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all |
4980 | 1.00 interface to zlib that skips zlib header |
4981 | 0.99 correct handling of alpha in palette |
4982 | 0.98 TGA loader by lonesock; dynamically add loaders (untested) |
4983 | 0.97 jpeg errors on too large a file; also catch another malloc failure |
4984 | 0.96 fix detection of invalid v value - particleman@mollyrocket forum |
4985 | 0.95 during header scan, seek to markers in case of padding |
4986 | 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same |
4987 | 0.93 handle jpegtran output; verbose errors |
4988 | 0.92 read 4,8,16,24,32-bit BMP files of several formats |
4989 | 0.91 output 24-bit Windows 3.0 BMP files |
4990 | 0.90 fix a few more warnings; bump version number to approach 1.0 |
4991 | 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd |
4992 | 0.60 fix compiling as c++ |
4993 | 0.59 fix warnings: merge Dave Moore's -Wall fixes |
4994 | 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian |
4995 | 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less |
4996 | than 16 available |
4997 | 0.56 fix bug: zlib uncompressed mode len vs. nlen |
4998 | 0.55 fix bug: restart_interval not initialized to 0 |
4999 | 0.54 allow NULL for 'int *comp' |
5000 | 0.53 fix bug in png 3->4; speedup png decoding |
5001 | 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments |
5002 | 0.51 obey req_comp requests, 1-component jpegs return as 1-component, |
5003 | on 'test' only check type, not whether we support this variant |
5004 | */ |
5005 | |