kolibrios/drivers/video/drm/drm_rect.c
Sergey Semyonov (Serge) 7f2170cd0d i915: 3.12-rc6
git-svn-id: svn://kolibrios.org@4104 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-10-26 13:34:57 +00:00

296 lines
8.0 KiB
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 (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);