include/ui/rect.h

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0-or-later
   3  */
   4 #ifndef QEMU_RECT_H
   5 #define QEMU_RECT_H
   6
   7
   8 typedef struct QemuRect {
   9     int16_t x;
  10     int16_t y;
  11     uint16_t width;
  12     uint16_t height;
  13 } QemuRect;
  14
  15 static inline void qemu_rect_init(QemuRect *rect,
  16                                   int16_t x, int16_t y,
  17                                   uint16_t width, uint16_t height)
  18 {
  19     rect->x = x;
  20     rect->y = y;
  21     rect->width = width;
  22     rect->height = height;
  23 }
  24
  25 static inline void qemu_rect_translate(QemuRect *rect,
  26                                        int16_t dx, int16_t dy)
  27 {
  28     rect->x += dx;
  29     rect->y += dy;
  30 }
  31
  32 static inline bool qemu_rect_intersect(const QemuRect *a, const QemuRect *b,
  33                                        QemuRect *res)
  34 {
  35     int16_t x1, x2, y1, y2;
  36
  37     x1 = MAX(a->x, b->x);
  38     y1 = MAX(a->y, b->y);
  39     x2 = MIN(a->x + a->width, b->x + b->width);
  40     y2 = MIN(a->y + a->height, b->y + b->height);
  41
  42     if (x1 >= x2 || y1 >= y2) {
  43         if (res) {
  44             qemu_rect_init(res, 0, 0, 0, 0);
  45         }
  46
  47         return false;
  48     }
  49
  50     if (res) {
  51         qemu_rect_init(res, x1, y1, x2 - x1, y2 - y1);
  52     }
  53
  54     return true;
  55 }
  56
  57 #endif