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3512f976 VS |
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> | |
e7272df3 | 27 | #include <drm/drmP.h> |
3512f976 VS |
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); | |
4954c428 VS |
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); | |
e7272df3 VS |
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); |