drm_rect.h
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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.
*/
#ifndef DRM_RECT_H
#define DRM_RECT_H
/**
* DOC: rect utils
*
* Utility functions to help manage rectangular areas for
* clipping, scaling, etc. calculations.
*/
/**
* struct drm_rect - two dimensional rectangle
* @x1: horizontal starting coordinate (inclusive)
* @x2: horizontal ending coordinate (exclusive)
* @y1: vertical starting coordinate (inclusive)
* @y2: vertical ending coordinate (exclusive)
*/
struct drm_rect {
int x1, y1, x2, y2;
};
/**
* drm_rect_adjust_size - adjust the size of the rectangle
* @r: rectangle to be adjusted
* @dw: horizontal adjustment
* @dh: vertical adjustment
*
* Change the size of rectangle @r by @dw in the horizontal direction,
* and by @dh in the vertical direction, while keeping the center
* of @r stationary.
*
* Positive @dw and @dh increase the size, negative values decrease it.
*/
static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
{
r->x1 -= dw >> 1;
r->y1 -= dh >> 1;
r->x2 += (dw + 1) >> 1;
r->y2 += (dh + 1) >> 1;
}
/**
* drm_rect_translate - translate the rectangle
* @r: rectangle to be tranlated
* @dx: horizontal translation
* @dy: vertical translation
*
* Move rectangle @r by @dx in the horizontal direction,
* and by @dy in the vertical direction.
*/
static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
{
r->x1 += dx;
r->y1 += dy;
r->x2 += dx;
r->y2 += dy;
}
/**
* drm_rect_downscale - downscale a rectangle
* @r: rectangle to be downscaled
* @horz: horizontal downscale factor
* @vert: vertical downscale factor
*
* Divide the coordinates of rectangle @r by @horz and @vert.
*/
static inline void drm_rect_downscale(struct drm_rect *r, int horz, int vert)
{
r->x1 /= horz;
r->y1 /= vert;
r->x2 /= horz;
r->y2 /= vert;
}
/**
* drm_rect_width - determine the rectangle width
* @r: rectangle whose width is returned
*
* RETURNS:
* The width of the rectangle.
*/
static inline int drm_rect_width(const struct drm_rect *r)
{
return r->x2 - r->x1;
}
/**
* drm_rect_height - determine the rectangle height
* @r: rectangle whose height is returned
*
* RETURNS:
* The height of the rectangle.
*/
static inline int drm_rect_height(const struct drm_rect *r)
{
return r->y2 - r->y1;
}
/**
* drm_rect_visible - determine if the the rectangle is visible
* @r: rectangle whose visibility is returned
*
* RETURNS:
* %true if the rectangle is visible, %false otherwise.
*/
static inline bool drm_rect_visible(const struct drm_rect *r)
{
return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
}
/**
* drm_rect_equals - determine if two rectangles are equal
* @r1: first rectangle
* @r2: second rectangle
*
* RETURNS:
* %true if the rectangles are equal, %false otherwise.
*/
static inline bool drm_rect_equals(const struct drm_rect *r1,
const struct drm_rect *r2)
{
return r1->x1 == r2->x1 && r1->x2 == r2->x2 &&
r1->y1 == r2->y1 && r1->y2 == r2->y2;
}
bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
const struct drm_rect *clip,
int hscale, int vscale);
int drm_rect_calc_hscale(const struct drm_rect *src,
const struct drm_rect *dst,
int min_hscale, int max_hscale);
int drm_rect_calc_vscale(const struct drm_rect *src,
const struct drm_rect *dst,
int min_vscale, int max_vscale);
int drm_rect_calc_hscale_relaxed(struct drm_rect *src,
struct drm_rect *dst,
int min_hscale, int max_hscale);
int drm_rect_calc_vscale_relaxed(struct drm_rect *src,
struct drm_rect *dst,
int min_vscale, int max_vscale);
void drm_rect_debug_print(const struct drm_rect *r, bool fixed_point);
#endif