summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_rect.c
blob: 8c057829b80423c93984f8ec78e9ed5a18ba0e5c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
/*
 * Copyright (C) 2011-2013 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <drm/drmP.h>
#include <drm/drm_rect.h>

/**
 * drm_rect_intersect - intersect two rectangles
 * @r1: first rectangle
 * @r2: second rectangle
 *
 * Calculate the intersection of rectangles @r1 and @r2.
 * @r1 will be overwritten with the intersection.
 *
 * RETURNS:
 * %true if rectangle @r1 is still visible after the operation,
 * %false otherwise.
 */
bool drm_rect_intersect(struct drm_rect *r1, const struct drm_rect *r2)
{
	r1->x1 = max(r1->x1, r2->x1);
	r1->y1 = max(r1->y1, r2->y1);
	r1->x2 = min(r1->x2, r2->x2);
	r1->y2 = min(r1->y2, r2->y2);

	return drm_rect_visible(r1);
}
EXPORT_SYMBOL(drm_rect_intersect);

static u32 clip_scaled(u32 src, u32 dst, u32 clip)
{
	u64 tmp = mul_u32_u32(src, dst - clip);

	/*
	 * Round toward 1.0 when clipping so that we don't accidentally
	 * change upscaling to downscaling or vice versa.
	 */
	if (src < (dst << 16))
		return DIV_ROUND_UP_ULL(tmp, dst);
	else
		return DIV_ROUND_DOWN_ULL(tmp, dst);
}

/**
 * drm_rect_clip_scaled - perform a scaled clip operation
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @clip: clip rectangle
 *
 * Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
 * same amounts multiplied by @hscale and @vscale.
 *
 * RETURNS:
 * %true if rectangle @dst is still visible after being clipped,
 * %false otherwise
 */
bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
			  const struct drm_rect *clip)
{
	int diff;

	diff = clip->x1 - dst->x1;
	if (diff > 0) {
		u32 new_src_w = clip_scaled(drm_rect_width(src),
					    drm_rect_width(dst), diff);

		src->x1 = clamp_t(int64_t, src->x2 - new_src_w, INT_MIN, INT_MAX);
		dst->x1 = clip->x1;
	}
	diff = clip->y1 - dst->y1;
	if (diff > 0) {
		u32 new_src_h = clip_scaled(drm_rect_height(src),
					    drm_rect_height(dst), diff);

		src->y1 = clamp_t(int64_t, src->y2 - new_src_h, INT_MIN, INT_MAX);
		dst->y1 = clip->y1;
	}
	diff = dst->x2 - clip->x2;
	if (diff > 0) {
		u32 new_src_w = clip_scaled(drm_rect_width(src),
					    drm_rect_width(dst), diff);

		src->x2 = clamp_t(int64_t, src->x1 + new_src_w, INT_MIN, INT_MAX);
		dst->x2 = clip->x2;
	}
	diff = dst->y2 - clip->y2;
	if (diff > 0) {
		u32 new_src_h = clip_scaled(drm_rect_height(src),
					    drm_rect_height(dst), diff);

		src->y2 = clamp_t(int64_t, src->y1 + new_src_h, INT_MIN, INT_MAX);
		dst->y2 = clip->y2;
	}

	return drm_rect_visible(dst);
}
EXPORT_SYMBOL(drm_rect_clip_scaled);

static int drm_calc_scale(int src, int dst)
{
	int scale = 0;

	if (WARN_ON(src < 0 || dst < 0))
		return -EINVAL;

	if (dst == 0)
		return 0;

	if (src > (dst << 16))
		return DIV_ROUND_UP(src, dst);
	else
		scale = src / dst;

	return scale;
}

/**
 * drm_rect_calc_hscale - calculate the horizontal scaling factor
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @min_hscale: minimum allowed horizontal scaling factor
 * @max_hscale: maximum allowed horizontal scaling factor
 *
 * Calculate the horizontal scaling factor as
 * (@src width) / (@dst width).
 *
 * If the scale is below 1 << 16, round down. If the scale is above
 * 1 << 16, round up. This will calculate the scale with the most
 * pessimistic limit calculation.
 *
 * RETURNS:
 * The horizontal scaling factor, or errno of out of limits.
 */
int drm_rect_calc_hscale(const struct drm_rect *src,
			 const struct drm_rect *dst,
			 int min_hscale, int max_hscale)
{
	int src_w = drm_rect_width(src);
	int dst_w = drm_rect_width(dst);
	int hscale = drm_calc_scale(src_w, dst_w);

	if (hscale < 0 || dst_w == 0)
		return hscale;

	if (hscale < min_hscale || hscale > max_hscale)
		return -ERANGE;

	return hscale;
}
EXPORT_SYMBOL(drm_rect_calc_hscale);

/**
 * drm_rect_calc_vscale - calculate the vertical scaling factor
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @min_vscale: minimum allowed vertical scaling factor
 * @max_vscale: maximum allowed vertical scaling factor
 *
 * Calculate the vertical scaling factor as
 * (@src height) / (@dst height).
 *
 * If the scale is below 1 << 16, round down. If the scale is above
 * 1 << 16, round up. This will calculate the scale with the most
 * pessimistic limit calculation.
 *
 * RETURNS:
 * The vertical scaling factor, or errno of out of limits.
 */
int drm_rect_calc_vscale(const struct drm_rect *src,
			 const struct drm_rect *dst,
			 int min_vscale, int max_vscale)
{
	int src_h = drm_rect_height(src);
	int dst_h = drm_rect_height(dst);
	int vscale = drm_calc_scale(src_h, dst_h);

	if (vscale < 0 || dst_h == 0)
		return vscale;

	if (vscale < min_vscale || vscale > max_vscale)
		return -ERANGE;

	return vscale;
}
EXPORT_SYMBOL(drm_rect_calc_vscale);

/**
 * drm_calc_hscale_relaxed - calculate the horizontal scaling factor
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @min_hscale: minimum allowed horizontal scaling factor
 * @max_hscale: maximum allowed horizontal scaling factor
 *
 * Calculate the horizontal scaling factor as
 * (@src width) / (@dst width).
 *
 * If the calculated scaling factor is below @min_vscale,
 * decrease the height of rectangle @dst to compensate.
 *
 * If the calculated scaling factor is above @max_vscale,
 * decrease the height of rectangle @src to compensate.
 *
 * If the scale is below 1 << 16, round down. If the scale is above
 * 1 << 16, round up. This will calculate the scale with the most
 * pessimistic limit calculation.
 *
 * RETURNS:
 * The horizontal scaling factor.
 */
int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
				 struct drm_rect *dst,
				 int min_hscale, int max_hscale)
{
	int src_w = drm_rect_width(src);
	int dst_w = drm_rect_width(dst);
	int hscale = drm_calc_scale(src_w, dst_w);

	if (hscale < 0 || dst_w == 0)
		return hscale;

	if (hscale < min_hscale) {
		int max_dst_w = src_w / min_hscale;

		drm_rect_adjust_size(dst, max_dst_w - dst_w, 0);

		return min_hscale;
	}

	if (hscale > max_hscale) {
		int max_src_w = dst_w * max_hscale;

		drm_rect_adjust_size(src, max_src_w - src_w, 0);

		return max_hscale;
	}

	return hscale;
}
EXPORT_SYMBOL(drm_rect_calc_hscale_relaxed);

/**
 * drm_rect_calc_vscale_relaxed - calculate the vertical scaling factor
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @min_vscale: minimum allowed vertical scaling factor
 * @max_vscale: maximum allowed vertical scaling factor
 *
 * Calculate the vertical scaling factor as
 * (@src height) / (@dst height).
 *
 * If the calculated scaling factor is below @min_vscale,
 * decrease the height of rectangle @dst to compensate.
 *
 * If the calculated scaling factor is above @max_vscale,
 * decrease the height of rectangle @src to compensate.
 *
 * If the scale is below 1 << 16, round down. If the scale is above
 * 1 << 16, round up. This will calculate the scale with the most
 * pessimistic limit calculation.
 *
 * RETURNS:
 * The vertical scaling factor.
 */
int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
				 struct drm_rect *dst,
				 int min_vscale, int max_vscale)
{
	int src_h = drm_rect_height(src);
	int dst_h = drm_rect_height(dst);
	int vscale = drm_calc_scale(src_h, dst_h);

	if (vscale < 0 || dst_h == 0)
		return vscale;

	if (vscale < min_vscale) {
		int max_dst_h = src_h / min_vscale;

		drm_rect_adjust_size(dst, 0, max_dst_h - dst_h);

		return min_vscale;
	}

	if (vscale > max_vscale) {
		int max_src_h = dst_h * max_vscale;

		drm_rect_adjust_size(src, 0, max_src_h - src_h);

		return max_vscale;
	}

	return vscale;
}
EXPORT_SYMBOL(drm_rect_calc_vscale_relaxed);

/**
 * drm_rect_debug_print - print the rectangle information
 * @prefix: prefix string
 * @r: rectangle to print
 * @fixed_point: rectangle is in 16.16 fixed point format
 */
void drm_rect_debug_print(const char *prefix, const struct drm_rect *r, bool fixed_point)
{
	if (fixed_point)
		DRM_DEBUG_KMS("%s" DRM_RECT_FP_FMT "\n", prefix, DRM_RECT_FP_ARG(r));
	else
		DRM_DEBUG_KMS("%s" DRM_RECT_FMT "\n", prefix, DRM_RECT_ARG(r));
}
EXPORT_SYMBOL(drm_rect_debug_print);

/**
 * drm_rect_rotate - Rotate the rectangle
 * @r: rectangle to be rotated
 * @width: Width of the coordinate space
 * @height: Height of the coordinate space
 * @rotation: Transformation to be applied
 *
 * Apply @rotation to the coordinates of rectangle @r.
 *
 * @width and @height combined with @rotation define
 * the location of the new origin.
 *
 * @width correcsponds to the horizontal and @height
 * to the vertical axis of the untransformed coordinate
 * space.
 */
void drm_rect_rotate(struct drm_rect *r,
		     int width, int height,
		     unsigned int rotation)
{
	struct drm_rect tmp;

	if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
		tmp = *r;

		if (rotation & DRM_MODE_REFLECT_X) {
			r->x1 = width - tmp.x2;
			r->x2 = width - tmp.x1;
		}

		if (rotation & DRM_MODE_REFLECT_Y) {
			r->y1 = height - tmp.y2;
			r->y2 = height - tmp.y1;
		}
	}

	switch (rotation & DRM_MODE_ROTATE_MASK) {
	case DRM_MODE_ROTATE_0:
		break;
	case DRM_MODE_ROTATE_90:
		tmp = *r;
		r->x1 = tmp.y1;
		r->x2 = tmp.y2;
		r->y1 = width - tmp.x2;
		r->y2 = width - tmp.x1;
		break;
	case DRM_MODE_ROTATE_180:
		tmp = *r;
		r->x1 = width - tmp.x2;
		r->x2 = width - tmp.x1;
		r->y1 = height - tmp.y2;
		r->y2 = height - tmp.y1;
		break;
	case DRM_MODE_ROTATE_270:
		tmp = *r;
		r->x1 = height - tmp.y2;
		r->x2 = height - tmp.y1;
		r->y1 = tmp.x1;
		r->y2 = tmp.x2;
		break;
	default:
		break;
	}
}
EXPORT_SYMBOL(drm_rect_rotate);

/**
 * drm_rect_rotate_inv - Inverse rotate the rectangle
 * @r: rectangle to be rotated
 * @width: Width of the coordinate space
 * @height: Height of the coordinate space
 * @rotation: Transformation whose inverse is to be applied
 *
 * Apply the inverse of @rotation to the coordinates
 * of rectangle @r.
 *
 * @width and @height combined with @rotation define
 * the location of the new origin.
 *
 * @width correcsponds to the horizontal and @height
 * to the vertical axis of the original untransformed
 * coordinate space, so that you never have to flip
 * them when doing a rotatation and its inverse.
 * That is, if you do ::
 *
 *     drm_rect_rotate(&r, width, height, rotation);
 *     drm_rect_rotate_inv(&r, width, height, rotation);
 *
 * you will always get back the original rectangle.
 */
void drm_rect_rotate_inv(struct drm_rect *r,
			 int width, int height,
			 unsigned int rotation)
{
	struct drm_rect tmp;

	switch (rotation & DRM_MODE_ROTATE_MASK) {
	case DRM_MODE_ROTATE_0:
		break;
	case DRM_MODE_ROTATE_90:
		tmp = *r;
		r->x1 = width - tmp.y2;
		r->x2 = width - tmp.y1;
		r->y1 = tmp.x1;
		r->y2 = tmp.x2;
		break;
	case DRM_MODE_ROTATE_180:
		tmp = *r;
		r->x1 = width - tmp.x2;
		r->x2 = width - tmp.x1;
		r->y1 = height - tmp.y2;
		r->y2 = height - tmp.y1;
		break;
	case DRM_MODE_ROTATE_270:
		tmp = *r;
		r->x1 = tmp.y1;
		r->x2 = tmp.y2;
		r->y1 = height - tmp.x2;
		r->y2 = height - tmp.x1;
		break;
	default:
		break;
	}

	if (rotation & (DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y)) {
		tmp = *r;

		if (rotation & DRM_MODE_REFLECT_X) {
			r->x1 = width - tmp.x2;
			r->x2 = width - tmp.x1;
		}

		if (rotation & DRM_MODE_REFLECT_Y) {
			r->y1 = height - tmp.y2;
			r->y2 = height - tmp.y1;
		}
	}
}
EXPORT_SYMBOL(drm_rect_rotate_inv);