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/*

 * 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 

#include 

#include 

#include 

#include 

/**

 * 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 (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)

{

	int w = drm_rect_width(r);

	int h = drm_rect_height(r);

	if (fixed_point)

		DRM_DEBUG_KMS("%s%d.%06ux%d.%06u%+d.%06u%+d.%06u\n", prefix,

			      w >> 16, ((w & 0xffff) * 15625) >> 10,

			      h >> 16, ((h & 0xffff) * 15625) >> 10,

			      r->x1 >> 16, ((r->x1 & 0xffff) * 15625) >> 10,

			      r->y1 >> 16, ((r->y1 & 0xffff) * 15625) >> 10);

	else

		DRM_DEBUG_KMS("%s%dx%d%+d%+d\n", prefix, w, h, r->x1, r->y1);

}

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 & (BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y))) {

		tmp = *r;

		if (rotation & BIT(DRM_REFLECT_X)) {

			r->x1 = width - tmp.x2;

			r->x2 = width - tmp.x1;

		}

		if (rotation & BIT(DRM_REFLECT_Y)) {

			r->y1 = height - tmp.y2;

			r->y2 = height - tmp.y1;

		}

	}

	switch (rotation & DRM_ROTATE_MASK) {

	case BIT(DRM_ROTATE_0):

		break;

	case BIT(DRM_ROTATE_90):

		tmp = *r;

		r->x1 = tmp.y1;

		r->x2 = tmp.y2;

		r->y1 = width - tmp.x2;

		r->y2 = width - tmp.x1;

		break;

	case BIT(DRM_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 BIT(DRM_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_rotate(&r, width, height, rotation);

 * drm_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_ROTATE_MASK) {

	case BIT(DRM_ROTATE_0):

		break;

	case BIT(DRM_ROTATE_90):

		tmp = *r;

		r->x1 = width - tmp.y2;

		r->x2 = width - tmp.y1;

		r->y1 = tmp.x1;

		r->y2 = tmp.x2;

		break;

	case BIT(DRM_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 BIT(DRM_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 & (BIT(DRM_REFLECT_X) | BIT(DRM_REFLECT_Y))) {

		tmp = *r;

		if (rotation & BIT(DRM_REFLECT_X)) {

			r->x1 = width - tmp.x2;

			r->x2 = width - tmp.x1;

		}

		if (rotation & BIT(DRM_REFLECT_Y)) {

			r->y1 = height - tmp.y2;

			r->y2 = height - tmp.y1;

		}

	}

}

EXPORT_SYMBOL(drm_rect_rotate_inv);