1 | /* |
2 | * Copyright (C) 2011-2013 Intel Corporation |
3 | * |
4 | * Permission is hereby granted, free of charge, to any person obtaining a |
5 | * copy of this software and associated documentation files (the "Software"), |
6 | * to deal in the Software without restriction, including without limitation |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
8 | * and/or sell copies of the Software, and to permit persons to whom the |
9 | * Software is furnished to do so, subject to the following conditions: |
10 | * |
11 | * The above copyright notice and this permission notice (including the next |
12 | * paragraph) shall be included in all copies or substantial portions of the |
13 | * Software. |
14 | * |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
21 | * SOFTWARE. |
22 | */ |
23 | |
24 | #include <linux/errno.h> |
25 | #include <linux/export.h> |
26 | #include <linux/kernel.h> |
27 | #include <drm/drmP.h> |
28 | #include <drm/drm_rect.h> |
29 | |
30 | /** |
31 | * drm_rect_intersect - intersect two rectangles |
32 | * @r1: first rectangle |
33 | * @r2: second rectangle |
34 | * |
35 | * Calculate the intersection of rectangles @r1 and @r2. |
36 | * @r1 will be overwritten with the intersection. |
37 | * |
38 | * RETURNS: |
39 | * %true if rectangle @r1 is still visible after the operation, |
40 | * %false otherwise. |
41 | */ |
42 | bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2) |
43 | { |
44 | r1->x1 = max(r1->x1, r2->x1); |
45 | r1->y1 = max(r1->y1, r2->y1); |
46 | r1->x2 = min(r1->x2, r2->x2); |
47 | r1->y2 = min(r1->y2, r2->y2); |
48 | |
49 | return drm_rect_visible(r1); |
50 | } |
51 | EXPORT_SYMBOL(drm_rect_intersect); |
52 | |
53 | /** |
54 | * drm_rect_clip_scaled - perform a scaled clip operation |
55 | * @src: source window rectangle |
56 | * @dst: destination window rectangle |
57 | * @clip: clip rectangle |
58 | * @hscale: horizontal scaling factor |
59 | * @vscale: vertical scaling factor |
60 | * |
61 | * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the |
62 | * same amounts multiplied by @hscale and @vscale. |
63 | * |
64 | * RETURNS: |
65 | * %true if rectangle @dst is still visible after being clipped, |
66 | * %false otherwise |
67 | */ |
68 | bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst, |
69 | const struct drm_rect *clip, |
70 | int hscale, int vscale) |
71 | { |
72 | int diff; |
73 | |
74 | diff = clip->x1 - dst->x1; |
75 | if (diff > 0) { |
76 | int64_t tmp = src->x1 + (int64_t) diff * hscale; |
77 | src->x1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); |
78 | } |
79 | diff = clip->y1 - dst->y1; |
80 | if (diff > 0) { |
81 | int64_t tmp = src->y1 + (int64_t) diff * vscale; |
82 | src->y1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); |
83 | } |
84 | diff = dst->x2 - clip->x2; |
85 | if (diff > 0) { |
86 | int64_t tmp = src->x2 - (int64_t) diff * hscale; |
87 | src->x2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); |
88 | } |
89 | diff = dst->y2 - clip->y2; |
90 | if (diff > 0) { |
91 | int64_t tmp = src->y2 - (int64_t) diff * vscale; |
92 | src->y2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); |
93 | } |
94 | |
95 | return drm_rect_intersect(dst, clip); |
96 | } |
97 | EXPORT_SYMBOL(drm_rect_clip_scaled); |
98 | |
99 | static int drm_calc_scale(int src, int dst) |
100 | { |
101 | int scale = 0; |
102 | |
103 | if (src < 0 || dst < 0) |
104 | return -EINVAL; |
105 | |
106 | if (dst == 0) |
107 | return 0; |
108 | |
109 | scale = src / dst; |
110 | |
111 | return scale; |
112 | } |
113 | |
114 | /** |
115 | * drm_rect_calc_hscale - calculate the horizontal scaling factor |
116 | * @src: source window rectangle |
117 | * @dst: destination window rectangle |
118 | * @min_hscale: minimum allowed horizontal scaling factor |
119 | * @max_hscale: maximum allowed horizontal scaling factor |
120 | * |
121 | * Calculate the horizontal scaling factor as |
122 | * (@src width) / (@dst width). |
123 | * |
124 | * RETURNS: |
125 | * The horizontal scaling factor, or errno of out of limits. |
126 | */ |
127 | int drm_rect_calc_hscale(const struct drm_rect *src, |
128 | const struct drm_rect *dst, |
129 | int min_hscale, int max_hscale) |
130 | { |
131 | int src_w = drm_rect_width(src); |
132 | int dst_w = drm_rect_width(dst); |
133 | int hscale = drm_calc_scale(src_w, dst_w); |
134 | |
135 | if (hscale < 0 || dst_w == 0) |
136 | return hscale; |
137 | |
138 | if (hscale < min_hscale || hscale > max_hscale) |
139 | return -ERANGE; |
140 | |
141 | return hscale; |
142 | } |
143 | EXPORT_SYMBOL(drm_rect_calc_hscale); |
144 | |
145 | /** |
146 | * drm_rect_calc_vscale - calculate the vertical scaling factor |
147 | * @src: source window rectangle |
148 | * @dst: destination window rectangle |
149 | * @min_vscale: minimum allowed vertical scaling factor |
150 | * @max_vscale: maximum allowed vertical scaling factor |
151 | * |
152 | * Calculate the vertical scaling factor as |
153 | * (@src height) / (@dst height). |
154 | * |
155 | * RETURNS: |
156 | * The vertical scaling factor, or errno of out of limits. |
157 | */ |
158 | int drm_rect_calc_vscale(const struct drm_rect *src, |
159 | const struct drm_rect *dst, |
160 | int min_vscale, int max_vscale) |
161 | { |
162 | int src_h = drm_rect_height(src); |
163 | int dst_h = drm_rect_height(dst); |
164 | int vscale = drm_calc_scale(src_h, dst_h); |
165 | |
166 | if (vscale < 0 || dst_h == 0) |
167 | return vscale; |
168 | |
169 | if (vscale < min_vscale || vscale > max_vscale) |
170 | return -ERANGE; |
171 | |
172 | return vscale; |
173 | } |
174 | EXPORT_SYMBOL(drm_rect_calc_vscale); |
175 | |
176 | /** |
177 | * drm_calc_hscale_relaxed - calculate the horizontal scaling factor |
178 | * @src: source window rectangle |
179 | * @dst: destination window rectangle |
180 | * @min_hscale: minimum allowed horizontal scaling factor |
181 | * @max_hscale: maximum allowed horizontal scaling factor |
182 | * |
183 | * Calculate the horizontal scaling factor as |
184 | * (@src width) / (@dst width). |
185 | * |
186 | * If the calculated scaling factor is below @min_vscale, |
187 | * decrease the height of rectangle @dst to compensate. |
188 | * |
189 | * If the calculated scaling factor is above @max_vscale, |
190 | * decrease the height of rectangle @src to compensate. |
191 | * |
192 | * RETURNS: |
193 | * The horizontal scaling factor. |
194 | */ |
195 | int drm_rect_calc_hscale_relaxed(struct drm_rect *src, |
196 | struct drm_rect *dst, |
197 | int min_hscale, int max_hscale) |
198 | { |
199 | int src_w = drm_rect_width(src); |
200 | int dst_w = drm_rect_width(dst); |
201 | int hscale = drm_calc_scale(src_w, dst_w); |
202 | |
203 | if (hscale < 0 || dst_w == 0) |
204 | return hscale; |
205 | |
206 | if (hscale < min_hscale) { |
207 | int max_dst_w = src_w / min_hscale; |
208 | |
209 | drm_rect_adjust_size(dst, max_dst_w - dst_w, 0); |
210 | |
211 | return min_hscale; |
212 | } |
213 | |
214 | if (hscale > max_hscale) { |
215 | int max_src_w = dst_w * max_hscale; |
216 | |
217 | drm_rect_adjust_size(src, max_src_w - src_w, 0); |
218 | |
219 | return max_hscale; |
220 | } |
221 | |
222 | return hscale; |
223 | } |
224 | EXPORT_SYMBOL(drm_rect_calc_hscale_relaxed); |
225 | |
226 | /** |
227 | * drm_rect_calc_vscale_relaxed - calculate the vertical scaling factor |
228 | * @src: source window rectangle |
229 | * @dst: destination window rectangle |
230 | * @min_vscale: minimum allowed vertical scaling factor |
231 | * @max_vscale: maximum allowed vertical scaling factor |
232 | * |
233 | * Calculate the vertical scaling factor as |
234 | * (@src height) / (@dst height). |
235 | * |
236 | * If the calculated scaling factor is below @min_vscale, |
237 | * decrease the height of rectangle @dst to compensate. |
238 | * |
239 | * If the calculated scaling factor is above @max_vscale, |
240 | * decrease the height of rectangle @src to compensate. |
241 | * |
242 | * RETURNS: |
243 | * The vertical scaling factor. |
244 | */ |
245 | int drm_rect_calc_vscale_relaxed(struct drm_rect *src, |
246 | struct drm_rect *dst, |
247 | int min_vscale, int max_vscale) |
248 | { |
249 | int src_h = drm_rect_height(src); |
250 | int dst_h = drm_rect_height(dst); |
251 | int vscale = drm_calc_scale(src_h, dst_h); |
252 | |
253 | if (vscale < 0 || dst_h == 0) |
254 | return vscale; |
255 | |
256 | if (vscale < min_vscale) { |
257 | int max_dst_h = src_h / min_vscale; |
258 | |
259 | drm_rect_adjust_size(dst, 0, max_dst_h - dst_h); |
260 | |
261 | return min_vscale; |
262 | } |
263 | |
264 | if (vscale > max_vscale) { |
265 | int max_src_h = dst_h * max_vscale; |
266 | |
267 | drm_rect_adjust_size(src, 0, max_src_h - src_h); |
268 | |
269 | return max_vscale; |
270 | } |
271 | |
272 | return vscale; |
273 | } |
274 | EXPORT_SYMBOL(drm_rect_calc_vscale_relaxed); |
275 | |
276 | /** |
277 | * drm_rect_debug_print - print the rectangle information |
278 | * @r: rectangle to print |
279 | * @fixed_point: rectangle is in 16.16 fixed point format |
280 | */ |
281 | void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point) |
282 | { |
283 | int w = drm_rect_width(r); |
284 | int h = drm_rect_height(r); |
285 | |
286 | if (fixed_point) |
287 | DRM_DEBUG_KMS("%d.%06ux%d.%06u%+d.%06u%+d.%06u\n" , |
288 | w >> 16, ((w & 0xffff) * 15625) >> 10, |
289 | h >> 16, ((h & 0xffff) * 15625) >> 10, |
290 | r->x1 >> 16, ((r->x1 & 0xffff) * 15625) >> 10, |
291 | r->y1 >> 16, ((r->y1 & 0xffff) * 15625) >> 10); |
292 | else |
293 | DRM_DEBUG_KMS("%dx%d%+d%+d\n" , w, h, r->x1, r->y1); |
294 | } |
295 | EXPORT_SYMBOL(drm_rect_debug_print); |
296 | |