[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / drm_rect.c

/*
 * 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);

/**
 * drm_rect_clip_scaled - perform a scaled clip operation
 * @src: source window rectangle
 * @dst: destination window rectangle
 * @clip: clip rectangle
 * @hscale: horizontal scaling factor
 * @vscale: vertical scaling factor
 *
 * 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 hscale, int vscale)
{
	int diff;

	diff = clip->x1 - dst->x1;
	if (diff > 0) {
		int64_t tmp = src->x1 + (int64_t) diff * hscale;
		src->x1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
	}
	diff = clip->y1 - dst->y1;
	if (diff > 0) {
		int64_t tmp = src->y1 + (int64_t) diff * vscale;
		src->y1 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
	}
	diff = dst->x2 - clip->x2;
	if (diff > 0) {
		int64_t tmp = src->x2 - (int64_t) diff * hscale;
		src->x2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
	}
	diff = dst->y2 - clip->y2;
	if (diff > 0) {
		int64_t tmp = src->y2 - (int64_t) diff * vscale;
		src->y2 = clamp_t(int64_t, tmp, INT_MIN, INT_MAX);
	}

	return drm_rect_intersect(dst, clip);
}
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;

	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).
 *
 * 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).
 *
 * 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.
 *
 * 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.
 *
 * 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_MODE_PROP_ROTATE(&r, width, height, rotation);
 *     DRM_MODE_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);
Commit	Line	Data
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
1e1a5f8f	103	if (WARN_ON(src < 0 \|\| dst < 0))
4954c428 VS	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
c70f577a	278	* @prefix: prefix string
e7272df3 VS	279	* @r: rectangle to print
	280	* @fixed_point: rectangle is in 16.16 fixed point format
	281	*/
c70f577a	282	void drm_rect_debug_print(const char prefix, const struct drm_rect r, bool fixed_point)
e7272df3	283	{
e7272df3	284	if (fixed_point)
65c7dc18	285	DRM_DEBUG_KMS("%s" DRM_RECT_FP_FMT "\n", prefix, DRM_RECT_FP_ARG(r));
e7272df3	286	else
65c7dc18	287	DRM_DEBUG_KMS("%s" DRM_RECT_FMT "\n", prefix, DRM_RECT_ARG(r));
e7272df3 VS	288	}
e7272df3 VS	289	EXPORT_SYMBOL(drm_rect_debug_print);
07074006 VS	290
	291	/**
	292	* drm_rect_rotate - Rotate the rectangle
	293	* @r: rectangle to be rotated
	294	* @width: Width of the coordinate space
	295	* @height: Height of the coordinate space
	296	* @rotation: Transformation to be applied
	297	*
	298	* Apply @rotation to the coordinates of rectangle @r.
	299	*
	300	* @width and @height combined with @rotation define
	301	* the location of the new origin.
	302	*
	303	* @width correcsponds to the horizontal and @height
	304	* to the vertical axis of the untransformed coordinate
	305	* space.
	306	*/
	307	void drm_rect_rotate(struct drm_rect *r,
	308	int width, int height,
	309	unsigned int rotation)
	310	{
	311	struct drm_rect tmp;
	312
c2c446ad	313	if (rotation & (DRM_MODE_REFLECT_X \| DRM_MODE_REFLECT_Y)) {
07074006 VS	314	tmp = *r;
07074006 VS	315
c2c446ad	316	if (rotation & DRM_MODE_REFLECT_X) {
07074006 VS	317	r->x1 = width - tmp.x2;
	318	r->x2 = width - tmp.x1;
	319	}
	320
c2c446ad	321	if (rotation & DRM_MODE_REFLECT_Y) {
07074006 VS	322	r->y1 = height - tmp.y2;
	323	r->y2 = height - tmp.y1;
	324	}
	325	}
	326
c2c446ad RF	327	switch (rotation & DRM_MODE_ROTATE_MASK) {
c2c446ad RF	328	case DRM_MODE_ROTATE_0:
07074006	329	break;
c2c446ad	330	case DRM_MODE_ROTATE_90:
07074006 VS	331	tmp = *r;
	332	r->x1 = tmp.y1;
	333	r->x2 = tmp.y2;
	334	r->y1 = width - tmp.x2;
	335	r->y2 = width - tmp.x1;
	336	break;
c2c446ad	337	case DRM_MODE_ROTATE_180:
07074006 VS	338	tmp = *r;
	339	r->x1 = width - tmp.x2;
	340	r->x2 = width - tmp.x1;
	341	r->y1 = height - tmp.y2;
	342	r->y2 = height - tmp.y1;
	343	break;
c2c446ad	344	case DRM_MODE_ROTATE_270:
07074006 VS	345	tmp = *r;
	346	r->x1 = height - tmp.y2;
	347	r->x2 = height - tmp.y1;
	348	r->y1 = tmp.x1;
	349	r->y2 = tmp.x2;
	350	break;
	351	default:
	352	break;
	353	}
	354	}
	355	EXPORT_SYMBOL(drm_rect_rotate);
	356
	357	/**
	358	* drm_rect_rotate_inv - Inverse rotate the rectangle
	359	* @r: rectangle to be rotated
	360	* @width: Width of the coordinate space
	361	* @height: Height of the coordinate space
	362	* @rotation: Transformation whose inverse is to be applied
	363	*
	364	* Apply the inverse of @rotation to the coordinates
	365	* of rectangle @r.
	366	*
	367	* @width and @height combined with @rotation define
	368	* the location of the new origin.
	369	*
	370	* @width correcsponds to the horizontal and @height
	371	* to the vertical axis of the original untransformed
	372	* coordinate space, so that you never have to flip
	373	* them when doing a rotatation and its inverse.
5edbfc47	374	* That is, if you do ::
07074006	375	*
c2c446ad RF	376	* DRM_MODE_PROP_ROTATE(&r, width, height, rotation);
c2c446ad RF	377	* DRM_MODE_ROTATE_inv(&r, width, height, rotation);
07074006 VS	378	*
	379	* you will always get back the original rectangle.
	380	*/
	381	void drm_rect_rotate_inv(struct drm_rect *r,
	382	int width, int height,
	383	unsigned int rotation)
	384	{
	385	struct drm_rect tmp;
	386
c2c446ad RF	387	switch (rotation & DRM_MODE_ROTATE_MASK) {
c2c446ad RF	388	case DRM_MODE_ROTATE_0:
07074006	389	break;
c2c446ad	390	case DRM_MODE_ROTATE_90:
07074006 VS	391	tmp = *r;
	392	r->x1 = width - tmp.y2;
	393	r->x2 = width - tmp.y1;
	394	r->y1 = tmp.x1;
	395	r->y2 = tmp.x2;
	396	break;
c2c446ad	397	case DRM_MODE_ROTATE_180:
07074006 VS	398	tmp = *r;
	399	r->x1 = width - tmp.x2;
	400	r->x2 = width - tmp.x1;
	401	r->y1 = height - tmp.y2;
	402	r->y2 = height - tmp.y1;
	403	break;
c2c446ad	404	case DRM_MODE_ROTATE_270:
07074006 VS	405	tmp = *r;
	406	r->x1 = tmp.y1;
	407	r->x2 = tmp.y2;
	408	r->y1 = height - tmp.x2;
	409	r->y2 = height - tmp.x1;
	410	break;
	411	default:
	412	break;
	413	}
	414
c2c446ad	415	if (rotation & (DRM_MODE_REFLECT_X \| DRM_MODE_REFLECT_Y)) {
07074006 VS	416	tmp = *r;
07074006 VS	417
c2c446ad	418	if (rotation & DRM_MODE_REFLECT_X) {
07074006 VS	419	r->x1 = width - tmp.x2;
	420	r->x2 = width - tmp.x1;
	421	}
	422
c2c446ad	423	if (rotation & DRM_MODE_REFLECT_Y) {
07074006 VS	424	r->y1 = height - tmp.y2;
	425	r->y2 = height - tmp.y1;
	426	}
	427	}
	428	}
	429	EXPORT_SYMBOL(drm_rect_rotate_inv);