[linux-2.6-block.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/drm_mode.h>
#include <drm/drm_print.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(int src, int dst, int *clip)
{
	u64 tmp;

	if (dst == 0)
		return 0;

	/* Only clip what we have. Keeps the result bounded. */
	*clip = min(*clip, dst);

	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
 * the corresponding amounts, retaining the vertical and horizontal scaling
 * factors from @src to @dst.
 *
 * 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 = src->x2 - new_src_w;
		dst->x1 += diff;
	}
	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 = src->y2 - new_src_h;
		dst->y1 += diff;
	}
	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 = src->x1 + new_src_w;
		dst->x2 -= diff;
	}
	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 = src->y1 + new_src_h;
		dst->y2 -= diff;
	}

	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_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);
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>
0500c04e SR	27
	28	#include <drm/drm_mode.h>
	29	#include <drm/drm_print.h>
3512f976 VS	30	#include <drm/drm_rect.h>
	31
	32	/**
	33	* drm_rect_intersect - intersect two rectangles
	34	* @r1: first rectangle
	35	* @r2: second rectangle
	36	*
	37	* Calculate the intersection of rectangles @r1 and @r2.
	38	* @r1 will be overwritten with the intersection.
	39	*
	40	* RETURNS:
	41	* %true if rectangle @r1 is still visible after the operation,
	42	* %false otherwise.
	43	*/
	44	bool drm_rect_intersect(struct drm_rect r1, const struct drm_rect r2)
	45	{
	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);
	50
	51	return drm_rect_visible(r1);
	52	}
	53	EXPORT_SYMBOL(drm_rect_intersect);
	54
2020af2d	55	static u32 clip_scaled(int src, int dst, int *clip)
f96bdf56	56	{
433480c1 VS	57	u64 tmp;
	58
	59	if (dst == 0)
	60	return 0;
	61
2e351705	62	/* Only clip what we have. Keeps the result bounded. */
2020af2d	63	clip = min(clip, dst);
2e351705	64
2020af2d	65	tmp = mul_u32_u32(src, dst - *clip);
f96bdf56 ML	66
	67	/*
	68	* Round toward 1.0 when clipping so that we don't accidentally
	69	* change upscaling to downscaling or vice versa.
	70	*/
	71	if (src < (dst << 16))
	72	return DIV_ROUND_UP_ULL(tmp, dst);
	73	else
	74	return DIV_ROUND_DOWN_ULL(tmp, dst);
	75	}
	76
3512f976 VS	77	/**
	78	* drm_rect_clip_scaled - perform a scaled clip operation
	79	* @src: source window rectangle
	80	* @dst: destination window rectangle
	81	* @clip: clip rectangle
3512f976 VS	82	*
3512f976 VS	83	* Clip rectangle @dst by rectangle @clip. Clip rectangle @src by the
94fee4a7 DV	84	* the corresponding amounts, retaining the vertical and horizontal scaling
94fee4a7 DV	85	* factors from @src to @dst.
3512f976 VS	86	*
3512f976 VS	87	* RETURNS:
94fee4a7	88	*
3512f976	89	* %true if rectangle @dst is still visible after being clipped,
94fee4a7	90	* %false otherwise.
3512f976 VS	91	*/
3512f976 VS	92	bool drm_rect_clip_scaled(struct drm_rect src, struct drm_rect dst,
f96bdf56	93	const struct drm_rect *clip)
3512f976 VS	94	{
	95	int diff;
	96
	97	diff = clip->x1 - dst->x1;
	98	if (diff > 0) {
f96bdf56	99	u32 new_src_w = clip_scaled(drm_rect_width(src),
2020af2d	100	drm_rect_width(dst), &diff);
f96bdf56	101
2e351705	102	src->x1 = src->x2 - new_src_w;
2020af2d	103	dst->x1 += diff;
3512f976 VS	104	}
	105	diff = clip->y1 - dst->y1;
	106	if (diff > 0) {
f96bdf56	107	u32 new_src_h = clip_scaled(drm_rect_height(src),
2020af2d	108	drm_rect_height(dst), &diff);
f96bdf56	109
2e351705	110	src->y1 = src->y2 - new_src_h;
2020af2d	111	dst->y1 += diff;
3512f976 VS	112	}
	113	diff = dst->x2 - clip->x2;
	114	if (diff > 0) {
f96bdf56	115	u32 new_src_w = clip_scaled(drm_rect_width(src),
2020af2d	116	drm_rect_width(dst), &diff);
f96bdf56	117
2e351705	118	src->x2 = src->x1 + new_src_w;
2020af2d	119	dst->x2 -= diff;
3512f976 VS	120	}
	121	diff = dst->y2 - clip->y2;
	122	if (diff > 0) {
f96bdf56	123	u32 new_src_h = clip_scaled(drm_rect_height(src),
2020af2d	124	drm_rect_height(dst), &diff);
f96bdf56	125
2e351705	126	src->y2 = src->y1 + new_src_h;
2020af2d	127	dst->y2 -= diff;
3512f976 VS	128	}
3512f976 VS	129
f96bdf56	130	return drm_rect_visible(dst);
3512f976 VS	131	}
3512f976 VS	132	EXPORT_SYMBOL(drm_rect_clip_scaled);
4954c428 VS	133
	134	static int drm_calc_scale(int src, int dst)
	135	{
	136	int scale = 0;
	137
1e1a5f8f	138	if (WARN_ON(src < 0 \|\| dst < 0))
4954c428 VS	139	return -EINVAL;
	140
	141	if (dst == 0)
	142	return 0;
	143
6f96f200 ML	144	if (src > (dst << 16))
	145	return DIV_ROUND_UP(src, dst);
	146	else
	147	scale = src / dst;
4954c428 VS	148
	149	return scale;
	150	}
	151
	152	/**
	153	* drm_rect_calc_hscale - calculate the horizontal scaling factor
	154	* @src: source window rectangle
	155	* @dst: destination window rectangle
	156	* @min_hscale: minimum allowed horizontal scaling factor
	157	* @max_hscale: maximum allowed horizontal scaling factor
	158	*
	159	* Calculate the horizontal scaling factor as
	160	* (@src width) / (@dst width).
	161	*
6f96f200 ML	162	* If the scale is below 1 << 16, round down. If the scale is above
	163	* 1 << 16, round up. This will calculate the scale with the most
	164	* pessimistic limit calculation.
	165	*
4954c428 VS	166	* RETURNS:
	167	* The horizontal scaling factor, or errno of out of limits.
	168	*/
	169	int drm_rect_calc_hscale(const struct drm_rect *src,
	170	const struct drm_rect *dst,
	171	int min_hscale, int max_hscale)
	172	{
	173	int src_w = drm_rect_width(src);
	174	int dst_w = drm_rect_width(dst);
	175	int hscale = drm_calc_scale(src_w, dst_w);
	176
	177	if (hscale < 0 \|\| dst_w == 0)
	178	return hscale;
	179
	180	if (hscale < min_hscale \|\| hscale > max_hscale)
	181	return -ERANGE;
	182
	183	return hscale;
	184	}
	185	EXPORT_SYMBOL(drm_rect_calc_hscale);
	186
	187	/**
	188	* drm_rect_calc_vscale - calculate the vertical scaling factor
	189	* @src: source window rectangle
	190	* @dst: destination window rectangle
	191	* @min_vscale: minimum allowed vertical scaling factor
	192	* @max_vscale: maximum allowed vertical scaling factor
	193	*
	194	* Calculate the vertical scaling factor as
	195	* (@src height) / (@dst height).
	196	*
6f96f200 ML	197	* If the scale is below 1 << 16, round down. If the scale is above
	198	* 1 << 16, round up. This will calculate the scale with the most
	199	* pessimistic limit calculation.
	200	*
4954c428 VS	201	* RETURNS:
	202	* The vertical scaling factor, or errno of out of limits.
	203	*/
	204	int drm_rect_calc_vscale(const struct drm_rect *src,
	205	const struct drm_rect *dst,
	206	int min_vscale, int max_vscale)
	207	{
	208	int src_h = drm_rect_height(src);
	209	int dst_h = drm_rect_height(dst);
	210	int vscale = drm_calc_scale(src_h, dst_h);
	211
	212	if (vscale < 0 \|\| dst_h == 0)
	213	return vscale;
	214
	215	if (vscale < min_vscale \|\| vscale > max_vscale)
	216	return -ERANGE;
	217
	218	return vscale;
	219	}
	220	EXPORT_SYMBOL(drm_rect_calc_vscale);
	221
e7272df3 VS	222	/**
e7272df3 VS	223	* drm_rect_debug_print - print the rectangle information
c70f577a	224	* @prefix: prefix string
e7272df3 VS	225	* @r: rectangle to print
	226	* @fixed_point: rectangle is in 16.16 fixed point format
	227	*/
c70f577a	228	void drm_rect_debug_print(const char prefix, const struct drm_rect r, bool fixed_point)
e7272df3	229	{
e7272df3	230	if (fixed_point)
65c7dc18	231	DRM_DEBUG_KMS("%s" DRM_RECT_FP_FMT "\n", prefix, DRM_RECT_FP_ARG(r));
e7272df3	232	else
65c7dc18	233	DRM_DEBUG_KMS("%s" DRM_RECT_FMT "\n", prefix, DRM_RECT_ARG(r));
e7272df3 VS	234	}
e7272df3 VS	235	EXPORT_SYMBOL(drm_rect_debug_print);
07074006 VS	236
	237	/**
	238	* drm_rect_rotate - Rotate the rectangle
	239	* @r: rectangle to be rotated
	240	* @width: Width of the coordinate space
	241	* @height: Height of the coordinate space
	242	* @rotation: Transformation to be applied
	243	*
	244	* Apply @rotation to the coordinates of rectangle @r.
	245	*
	246	* @width and @height combined with @rotation define
	247	* the location of the new origin.
	248	*
	249	* @width correcsponds to the horizontal and @height
	250	* to the vertical axis of the untransformed coordinate
	251	* space.
	252	*/
	253	void drm_rect_rotate(struct drm_rect *r,
	254	int width, int height,
	255	unsigned int rotation)
	256	{
	257	struct drm_rect tmp;
	258
c2c446ad	259	if (rotation & (DRM_MODE_REFLECT_X \| DRM_MODE_REFLECT_Y)) {
07074006 VS	260	tmp = *r;
07074006 VS	261
c2c446ad	262	if (rotation & DRM_MODE_REFLECT_X) {
07074006 VS	263	r->x1 = width - tmp.x2;
	264	r->x2 = width - tmp.x1;
	265	}
	266
c2c446ad	267	if (rotation & DRM_MODE_REFLECT_Y) {
07074006 VS	268	r->y1 = height - tmp.y2;
	269	r->y2 = height - tmp.y1;
	270	}
	271	}
	272
c2c446ad RF	273	switch (rotation & DRM_MODE_ROTATE_MASK) {
c2c446ad RF	274	case DRM_MODE_ROTATE_0:
07074006	275	break;
c2c446ad	276	case DRM_MODE_ROTATE_90:
07074006 VS	277	tmp = *r;
	278	r->x1 = tmp.y1;
	279	r->x2 = tmp.y2;
	280	r->y1 = width - tmp.x2;
	281	r->y2 = width - tmp.x1;
	282	break;
c2c446ad	283	case DRM_MODE_ROTATE_180:
07074006 VS	284	tmp = *r;
	285	r->x1 = width - tmp.x2;
	286	r->x2 = width - tmp.x1;
	287	r->y1 = height - tmp.y2;
	288	r->y2 = height - tmp.y1;
	289	break;
c2c446ad	290	case DRM_MODE_ROTATE_270:
07074006 VS	291	tmp = *r;
	292	r->x1 = height - tmp.y2;
	293	r->x2 = height - tmp.y1;
	294	r->y1 = tmp.x1;
	295	r->y2 = tmp.x2;
	296	break;
	297	default:
	298	break;
	299	}
	300	}
	301	EXPORT_SYMBOL(drm_rect_rotate);
	302
	303	/**
	304	* drm_rect_rotate_inv - Inverse rotate the rectangle
	305	* @r: rectangle to be rotated
	306	* @width: Width of the coordinate space
	307	* @height: Height of the coordinate space
	308	* @rotation: Transformation whose inverse is to be applied
	309	*
	310	* Apply the inverse of @rotation to the coordinates
	311	* of rectangle @r.
	312	*
	313	* @width and @height combined with @rotation define
	314	* the location of the new origin.
	315	*
	316	* @width correcsponds to the horizontal and @height
	317	* to the vertical axis of the original untransformed
	318	* coordinate space, so that you never have to flip
	319	* them when doing a rotatation and its inverse.
5edbfc47	320	* That is, if you do ::
07074006	321	*
ec667231 VS	322	* drm_rect_rotate(&r, width, height, rotation);
ec667231 VS	323	* drm_rect_rotate_inv(&r, width, height, rotation);
07074006 VS	324	*
	325	* you will always get back the original rectangle.
	326	*/
	327	void drm_rect_rotate_inv(struct drm_rect *r,
	328	int width, int height,
	329	unsigned int rotation)
	330	{
	331	struct drm_rect tmp;
	332
c2c446ad RF	333	switch (rotation & DRM_MODE_ROTATE_MASK) {
c2c446ad RF	334	case DRM_MODE_ROTATE_0:
07074006	335	break;
c2c446ad	336	case DRM_MODE_ROTATE_90:
07074006 VS	337	tmp = *r;
	338	r->x1 = width - tmp.y2;
	339	r->x2 = width - tmp.y1;
	340	r->y1 = tmp.x1;
	341	r->y2 = tmp.x2;
	342	break;
c2c446ad	343	case DRM_MODE_ROTATE_180:
07074006 VS	344	tmp = *r;
	345	r->x1 = width - tmp.x2;
	346	r->x2 = width - tmp.x1;
	347	r->y1 = height - tmp.y2;
	348	r->y2 = height - tmp.y1;
	349	break;
c2c446ad	350	case DRM_MODE_ROTATE_270:
07074006 VS	351	tmp = *r;
	352	r->x1 = tmp.y1;
	353	r->x2 = tmp.y2;
	354	r->y1 = height - tmp.x2;
	355	r->y2 = height - tmp.x1;
	356	break;
	357	default:
	358	break;
	359	}
	360
c2c446ad	361	if (rotation & (DRM_MODE_REFLECT_X \| DRM_MODE_REFLECT_Y)) {
07074006 VS	362	tmp = *r;
07074006 VS	363
c2c446ad	364	if (rotation & DRM_MODE_REFLECT_X) {
07074006 VS	365	r->x1 = width - tmp.x2;
	366	r->x2 = width - tmp.x1;
	367	}
	368
c2c446ad	369	if (rotation & DRM_MODE_REFLECT_Y) {
07074006 VS	370	r->y1 = height - tmp.y2;
	371	r->y2 = height - tmp.y1;
	372	}
	373	}
	374	}
	375	EXPORT_SYMBOL(drm_rect_rotate_inv);