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24 #include <linux/errno.h>
25 #include <linux/export.h>
26 #include <linux/kernel.h>
28 #include <drm/drm_mode.h>
29 #include <drm/drm_print.h>
30 #include <drm/drm_rect.h>
33 * drm_rect_intersect - intersect two rectangles
34 * @r1: first rectangle
35 * @r2: second rectangle
37 * Calculate the intersection of rectangles @r1 and @r2.
38 * @r1 will be overwritten with the intersection.
41 * %true if rectangle @r1 is still visible after the operation,
44 bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2)
46 r1->x1 = max(r1->x1, r2->x1);
47 r1->y1 = max(r1->y1, r2->y1);
48 r1->x2 = min(r1->x2, r2->x2);
49 r1->y2 = min(r1->y2, r2->y2);
51 return drm_rect_visible(r1);
53 EXPORT_SYMBOL(drm_rect_intersect);
55 static u32 clip_scaled(u32 src, u32 dst, u32 clip)
57 u64 tmp = mul_u32_u32(src, dst - clip);
60 * Round toward 1.0 when clipping so that we don't accidentally
61 * change upscaling to downscaling or vice versa.
63 if (src < (dst << 16))
64 return DIV_ROUND_UP_ULL(tmp, dst);
66 return DIV_ROUND_DOWN_ULL(tmp, dst);
70 * drm_rect_clip_scaled - perform a scaled clip operation
71 * @src: source window rectangle
72 * @dst: destination window rectangle
73 * @clip: clip rectangle
75 * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
76 * same amounts multiplied by @hscale and @vscale.
79 * %true if rectangle @dst is still visible after being clipped,
82 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
83 const struct drm_rect *clip)
87 diff = clip->x1 - dst->x1;
89 u32 new_src_w = clip_scaled(drm_rect_width(src),
90 drm_rect_width(dst), diff);
92 src->x1 = clamp_t(int64_t, src->x2 - new_src_w, INT_MIN, INT_MAX);
95 diff = clip->y1 - dst->y1;
97 u32 new_src_h = clip_scaled(drm_rect_height(src),
98 drm_rect_height(dst), diff);
100 src->y1 = clamp_t(int64_t, src->y2 - new_src_h, INT_MIN, INT_MAX);
103 diff = dst->x2 - clip->x2;
105 u32 new_src_w = clip_scaled(drm_rect_width(src),
106 drm_rect_width(dst), diff);
108 src->x2 = clamp_t(int64_t, src->x1 + new_src_w, INT_MIN, INT_MAX);
111 diff = dst->y2 - clip->y2;
113 u32 new_src_h = clip_scaled(drm_rect_height(src),
114 drm_rect_height(dst), diff);
116 src->y2 = clamp_t(int64_t, src->y1 + new_src_h, INT_MIN, INT_MAX);
120 return drm_rect_visible(dst);
122 EXPORT_SYMBOL(drm_rect_clip_scaled);
124 static int drm_calc_scale(int src, int dst)
128 if (WARN_ON(src < 0 || dst < 0))
134 if (src > (dst << 16))
135 return DIV_ROUND_UP(src, dst);
143 * drm_rect_calc_hscale - calculate the horizontal scaling factor
144 * @src: source window rectangle
145 * @dst: destination window rectangle
146 * @min_hscale: minimum allowed horizontal scaling factor
147 * @max_hscale: maximum allowed horizontal scaling factor
149 * Calculate the horizontal scaling factor as
150 * (@src width) / (@dst width).
152 * If the scale is below 1 << 16, round down. If the scale is above
153 * 1 << 16, round up. This will calculate the scale with the most
154 * pessimistic limit calculation.
157 * The horizontal scaling factor, or errno of out of limits.
159 int drm_rect_calc_hscale(const struct drm_rect *src,
160 const struct drm_rect *dst,
161 int min_hscale, int max_hscale)
163 int src_w = drm_rect_width(src);
164 int dst_w = drm_rect_width(dst);
165 int hscale = drm_calc_scale(src_w, dst_w);
167 if (hscale < 0 || dst_w == 0)
170 if (hscale < min_hscale || hscale > max_hscale)
175 EXPORT_SYMBOL(drm_rect_calc_hscale);
178 * drm_rect_calc_vscale - calculate the vertical scaling factor
179 * @src: source window rectangle
180 * @dst: destination window rectangle
181 * @min_vscale: minimum allowed vertical scaling factor
182 * @max_vscale: maximum allowed vertical scaling factor
184 * Calculate the vertical scaling factor as
185 * (@src height) / (@dst height).
187 * If the scale is below 1 << 16, round down. If the scale is above
188 * 1 << 16, round up. This will calculate the scale with the most
189 * pessimistic limit calculation.
192 * The vertical scaling factor, or errno of out of limits.
194 int drm_rect_calc_vscale(const struct drm_rect *src,
195 const struct drm_rect *dst,
196 int min_vscale, int max_vscale)
198 int src_h = drm_rect_height(src);
199 int dst_h = drm_rect_height(dst);
200 int vscale = drm_calc_scale(src_h, dst_h);
202 if (vscale < 0 || dst_h == 0)
205 if (vscale < min_vscale || vscale > max_vscale)
210 EXPORT_SYMBOL(drm_rect_calc_vscale);
213 * drm_rect_debug_print - print the rectangle information
214 * @prefix: prefix string
215 * @r: rectangle to print
216 * @fixed_point: rectangle is in 16.16 fixed point format
218 void drm_rect_debug_print(const char *prefix, const struct drm_rect *r, bool fixed_point)
221 DRM_DEBUG_KMS("%s" DRM_RECT_FP_FMT "\n", prefix, DRM_RECT_FP_ARG(r));
223 DRM_DEBUG_KMS("%s" DRM_RECT_FMT "\n", prefix, DRM_RECT_ARG(r));
225 EXPORT_SYMBOL(drm_rect_debug_print);
228 * drm_rect_rotate - Rotate the rectangle
229 * @r: rectangle to be rotated
230 * @width: Width of the coordinate space
231 * @height: Height of the coordinate space
232 * @rotation: Transformation to be applied
234 * Apply @rotation to the coordinates of rectangle @r.
236 * @width and @height combined with @rotation define
237 * the location of the new origin.
239 * @width correcsponds to the horizontal and @height
240 * to the vertical axis of the untransformed coordinate
243 void drm_rect_rotate(struct drm_rect *r,
244 int width, int height,
245 unsigned int rotation)
249 if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
252 if (rotation & DRM_MODE_REFLECT_X) {
253 r->x1 = width - tmp.x2;
254 r->x2 = width - tmp.x1;
257 if (rotation & DRM_MODE_REFLECT_Y) {
258 r->y1 = height - tmp.y2;
259 r->y2 = height - tmp.y1;
263 switch (rotation & DRM_MODE_ROTATE_MASK) {
264 case DRM_MODE_ROTATE_0:
266 case DRM_MODE_ROTATE_90:
270 r->y1 = width - tmp.x2;
271 r->y2 = width - tmp.x1;
273 case DRM_MODE_ROTATE_180:
275 r->x1 = width - tmp.x2;
276 r->x2 = width - tmp.x1;
277 r->y1 = height - tmp.y2;
278 r->y2 = height - tmp.y1;
280 case DRM_MODE_ROTATE_270:
282 r->x1 = height - tmp.y2;
283 r->x2 = height - tmp.y1;
291 EXPORT_SYMBOL(drm_rect_rotate);
294 * drm_rect_rotate_inv - Inverse rotate the rectangle
295 * @r: rectangle to be rotated
296 * @width: Width of the coordinate space
297 * @height: Height of the coordinate space
298 * @rotation: Transformation whose inverse is to be applied
300 * Apply the inverse of @rotation to the coordinates
303 * @width and @height combined with @rotation define
304 * the location of the new origin.
306 * @width correcsponds to the horizontal and @height
307 * to the vertical axis of the original untransformed
308 * coordinate space, so that you never have to flip
309 * them when doing a rotatation and its inverse.
310 * That is, if you do ::
312 * drm_rect_rotate(&r, width, height, rotation);
313 * drm_rect_rotate_inv(&r, width, height, rotation);
315 * you will always get back the original rectangle.
317 void drm_rect_rotate_inv(struct drm_rect *r,
318 int width, int height,
319 unsigned int rotation)
323 switch (rotation & DRM_MODE_ROTATE_MASK) {
324 case DRM_MODE_ROTATE_0:
326 case DRM_MODE_ROTATE_90:
328 r->x1 = width - tmp.y2;
329 r->x2 = width - tmp.y1;
333 case DRM_MODE_ROTATE_180:
335 r->x1 = width - tmp.x2;
336 r->x2 = width - tmp.x1;
337 r->y1 = height - tmp.y2;
338 r->y2 = height - tmp.y1;
340 case DRM_MODE_ROTATE_270:
344 r->y1 = height - tmp.x2;
345 r->y2 = height - tmp.x1;
351 if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
354 if (rotation & DRM_MODE_REFLECT_X) {
355 r->x1 = width - tmp.x2;
356 r->x2 = width - tmp.x1;
359 if (rotation & DRM_MODE_REFLECT_Y) {
360 r->y1 = height - tmp.y2;
361 r->y2 = height - tmp.y1;
365 EXPORT_SYMBOL(drm_rect_rotate_inv);