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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/drm_rect.h> | |
28 | ||
29 | /** | |
30 | * drm_rect_intersect - intersect two rectangles | |
31 | * @r1: first rectangle | |
32 | * @r2: second rectangle | |
33 | * | |
34 | * Calculate the intersection of rectangles @r1 and @r2. | |
35 | * @r1 will be overwritten with the intersection. | |
36 | * | |
37 | * RETURNS: | |
38 | * %true if rectangle @r1 is still visible after the operation, | |
39 | * %false otherwise. | |
40 | */ | |
41 | bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2) | |
42 | { | |
43 | r1->x1 = max(r1->x1, r2->x1); | |
44 | r1->y1 = max(r1->y1, r2->y1); | |
45 | r1->x2 = min(r1->x2, r2->x2); | |
46 | r1->y2 = min(r1->y2, r2->y2); | |
47 | ||
48 | return drm_rect_visible(r1); | |
49 | } | |
50 | EXPORT_SYMBOL(drm_rect_intersect); | |
51 | ||
52 | /** | |
53 | * drm_rect_clip_scaled - perform a scaled clip operation | |
54 | * @src: source window rectangle | |
55 | * @dst: destination window rectangle | |
56 | * @clip: clip rectangle | |
57 | * @hscale: horizontal scaling factor | |
58 | * @vscale: vertical scaling factor | |
59 | * | |
60 | * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the | |
61 | * same amounts multiplied by @hscale and @vscale. | |
62 | * | |
63 | * RETURNS: | |
64 | * %true if rectangle @dst is still visible after being clipped, | |
65 | * %false otherwise | |
66 | */ | |
67 | bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst, | |
68 | const struct drm_rect *clip, | |
69 | int hscale, int vscale) | |
70 | { | |
71 | int diff; | |
72 | ||
73 | diff = clip->x1 - dst->x1; | |
74 | if (diff > 0) { | |
75 | int64_t tmp = src->x1 + (int64_t) diff * hscale; | |
76 | src->x1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); | |
77 | } | |
78 | diff = clip->y1 - dst->y1; | |
79 | if (diff > 0) { | |
80 | int64_t tmp = src->y1 + (int64_t) diff * vscale; | |
81 | src->y1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); | |
82 | } | |
83 | diff = dst->x2 - clip->x2; | |
84 | if (diff > 0) { | |
85 | int64_t tmp = src->x2 - (int64_t) diff * hscale; | |
86 | src->x2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); | |
87 | } | |
88 | diff = dst->y2 - clip->y2; | |
89 | if (diff > 0) { | |
90 | int64_t tmp = src->y2 - (int64_t) diff * vscale; | |
91 | src->y2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX); | |
92 | } | |
93 | ||
94 | return drm_rect_intersect(dst, clip); | |
95 | } | |
96 | EXPORT_SYMBOL(drm_rect_clip_scaled); | |
4954c428 VS |
97 | |
98 | static int drm_calc_scale(int src, int dst) | |
99 | { | |
100 | int scale = 0; | |
101 | ||
102 | if (src < 0 || dst < 0) | |
103 | return -EINVAL; | |
104 | ||
105 | if (dst == 0) | |
106 | return 0; | |
107 | ||
108 | scale = src / dst; | |
109 | ||
110 | return scale; | |
111 | } | |
112 | ||
113 | /** | |
114 | * drm_rect_calc_hscale - calculate the horizontal scaling factor | |
115 | * @src: source window rectangle | |
116 | * @dst: destination window rectangle | |
117 | * @min_hscale: minimum allowed horizontal scaling factor | |
118 | * @max_hscale: maximum allowed horizontal scaling factor | |
119 | * | |
120 | * Calculate the horizontal scaling factor as | |
121 | * (@src width) / (@dst width). | |
122 | * | |
123 | * RETURNS: | |
124 | * The horizontal scaling factor, or errno of out of limits. | |
125 | */ | |
126 | int drm_rect_calc_hscale(const struct drm_rect *src, | |
127 | const struct drm_rect *dst, | |
128 | int min_hscale, int max_hscale) | |
129 | { | |
130 | int src_w = drm_rect_width(src); | |
131 | int dst_w = drm_rect_width(dst); | |
132 | int hscale = drm_calc_scale(src_w, dst_w); | |
133 | ||
134 | if (hscale < 0 || dst_w == 0) | |
135 | return hscale; | |
136 | ||
137 | if (hscale < min_hscale || hscale > max_hscale) | |
138 | return -ERANGE; | |
139 | ||
140 | return hscale; | |
141 | } | |
142 | EXPORT_SYMBOL(drm_rect_calc_hscale); | |
143 | ||
144 | /** | |
145 | * drm_rect_calc_vscale - calculate the vertical scaling factor | |
146 | * @src: source window rectangle | |
147 | * @dst: destination window rectangle | |
148 | * @min_vscale: minimum allowed vertical scaling factor | |
149 | * @max_vscale: maximum allowed vertical scaling factor | |
150 | * | |
151 | * Calculate the vertical scaling factor as | |
152 | * (@src height) / (@dst height). | |
153 | * | |
154 | * RETURNS: | |
155 | * The vertical scaling factor, or errno of out of limits. | |
156 | */ | |
157 | int drm_rect_calc_vscale(const struct drm_rect *src, | |
158 | const struct drm_rect *dst, | |
159 | int min_vscale, int max_vscale) | |
160 | { | |
161 | int src_h = drm_rect_height(src); | |
162 | int dst_h = drm_rect_height(dst); | |
163 | int vscale = drm_calc_scale(src_h, dst_h); | |
164 | ||
165 | if (vscale < 0 || dst_h == 0) | |
166 | return vscale; | |
167 | ||
168 | if (vscale < min_vscale || vscale > max_vscale) | |
169 | return -ERANGE; | |
170 | ||
171 | return vscale; | |
172 | } | |
173 | EXPORT_SYMBOL(drm_rect_calc_vscale); | |
174 | ||
175 | /** | |
176 | * drm_calc_hscale_relaxed - calculate the horizontal scaling factor | |
177 | * @src: source window rectangle | |
178 | * @dst: destination window rectangle | |
179 | * @min_hscale: minimum allowed horizontal scaling factor | |
180 | * @max_hscale: maximum allowed horizontal scaling factor | |
181 | * | |
182 | * Calculate the horizontal scaling factor as | |
183 | * (@src width) / (@dst width). | |
184 | * | |
185 | * If the calculated scaling factor is below @min_vscale, | |
186 | * decrease the height of rectangle @dst to compensate. | |
187 | * | |
188 | * If the calculated scaling factor is above @max_vscale, | |
189 | * decrease the height of rectangle @src to compensate. | |
190 | * | |
191 | * RETURNS: | |
192 | * The horizontal scaling factor. | |
193 | */ | |
194 | int drm_rect_calc_hscale_relaxed(struct drm_rect *src, | |
195 | struct drm_rect *dst, | |
196 | int min_hscale, int max_hscale) | |
197 | { | |
198 | int src_w = drm_rect_width(src); | |
199 | int dst_w = drm_rect_width(dst); | |
200 | int hscale = drm_calc_scale(src_w, dst_w); | |
201 | ||
202 | if (hscale < 0 || dst_w == 0) | |
203 | return hscale; | |
204 | ||
205 | if (hscale < min_hscale) { | |
206 | int max_dst_w = src_w / min_hscale; | |
207 | ||
208 | drm_rect_adjust_size(dst, max_dst_w - dst_w, 0); | |
209 | ||
210 | return min_hscale; | |
211 | } | |
212 | ||
213 | if (hscale > max_hscale) { | |
214 | int max_src_w = dst_w * max_hscale; | |
215 | ||
216 | drm_rect_adjust_size(src, max_src_w - src_w, 0); | |
217 | ||
218 | return max_hscale; | |
219 | } | |
220 | ||
221 | return hscale; | |
222 | } | |
223 | EXPORT_SYMBOL(drm_rect_calc_hscale_relaxed); | |
224 | ||
225 | /** | |
226 | * drm_rect_calc_vscale_relaxed - calculate the vertical scaling factor | |
227 | * @src: source window rectangle | |
228 | * @dst: destination window rectangle | |
229 | * @min_vscale: minimum allowed vertical scaling factor | |
230 | * @max_vscale: maximum allowed vertical scaling factor | |
231 | * | |
232 | * Calculate the vertical scaling factor as | |
233 | * (@src height) / (@dst height). | |
234 | * | |
235 | * If the calculated scaling factor is below @min_vscale, | |
236 | * decrease the height of rectangle @dst to compensate. | |
237 | * | |
238 | * If the calculated scaling factor is above @max_vscale, | |
239 | * decrease the height of rectangle @src to compensate. | |
240 | * | |
241 | * RETURNS: | |
242 | * The vertical scaling factor. | |
243 | */ | |
244 | int drm_rect_calc_vscale_relaxed(struct drm_rect *src, | |
245 | struct drm_rect *dst, | |
246 | int min_vscale, int max_vscale) | |
247 | { | |
248 | int src_h = drm_rect_height(src); | |
249 | int dst_h = drm_rect_height(dst); | |
250 | int vscale = drm_calc_scale(src_h, dst_h); | |
251 | ||
252 | if (vscale < 0 || dst_h == 0) | |
253 | return vscale; | |
254 | ||
255 | if (vscale < min_vscale) { | |
256 | int max_dst_h = src_h / min_vscale; | |
257 | ||
258 | drm_rect_adjust_size(dst, 0, max_dst_h - dst_h); | |
259 | ||
260 | return min_vscale; | |
261 | } | |
262 | ||
263 | if (vscale > max_vscale) { | |
264 | int max_src_h = dst_h * max_vscale; | |
265 | ||
266 | drm_rect_adjust_size(src, 0, max_src_h - src_h); | |
267 | ||
268 | return max_vscale; | |
269 | } | |
270 | ||
271 | return vscale; | |
272 | } | |
273 | EXPORT_SYMBOL(drm_rect_calc_vscale_relaxed); |