/* * 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 (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 * @r: rectangle to print * @fixed_point: rectangle is in 16.16 fixed point format */void drm_rect_debug_print(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("%d.%06ux%d.%06u%+d.%06u%+d.%06u\n",			      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("%dx%d%+d%+d\n", w, h, r->x1, r->y1);}EXPORT_SYMBOL(drm_rect_debug_print);