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
 
#include <linux/types.h>
 
struct drm_rect {
    int x1, y1, x2, y2;
};
 
#define DRM_RECT_INIT(x, y, w, h) ((struct drm_rect){ \
        .x1 = (x), \
        .y1 = (y), \
        .x2 = (x) + (w), \
        .y2 = (y) + (h) })
 
#define DRM_RECT_FMT    "%dx%d%+d%+d"
#define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
 
#define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
#define DRM_RECT_FP_ARG(r) \
        drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
        drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
        (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
        (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
 
static inline void drm_rect_init(struct drm_rect *r, int x, int y,
                 int width, int height)
{
    r->x1 = x;
    r->y1 = y;
    r->x2 = x + width;
    r->y2 = y + height;
}
 
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;
}
 
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;
}
 
static inline void drm_rect_translate_to(struct drm_rect *r, int x, int y)
{
    drm_rect_translate(r, x - r->x1, y - r->y1);
}
 
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;
}
 
static inline int drm_rect_width(const struct drm_rect *r)
{
    return r->x2 - r->x1;
}
 
static inline int drm_rect_height(const struct drm_rect *r)
{
    return r->y2 - r->y1;
}
 
static inline bool drm_rect_visible(const struct drm_rect *r)
{
    return drm_rect_width(r) > 0 && drm_rect_height(r) > 0;
}
 
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;
}
 
static inline void drm_rect_fp_to_int(struct drm_rect *dst,
                      const struct drm_rect *src)
{
    drm_rect_init(dst, src->x1 >> 16, src->y1 >> 16,
              drm_rect_width(src) >> 16,
              drm_rect_height(src) >> 16);
}
 
static inline bool drm_rect_overlap(const struct drm_rect *a,
                    const struct drm_rect *b)
{
    return (a->x2 > b->x1 && b->x2 > a->x1 &&
        a->y2 > b->y1 && b->y2 > a->y1);
}
 
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 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);
void drm_rect_debug_print(const char *prefix,
              const struct drm_rect *r, bool fixed_point);
void drm_rect_rotate(struct drm_rect *r,
             int width, int height,
             unsigned int rotation);
void drm_rect_rotate_inv(struct drm_rect *r,
             int width, int height,
             unsigned int rotation);
 
#endif