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 #include <stdint.h>
   8 #include <stdbool.h>
   9
  10 typedef struct QemuRect {
  11     int16_t x;
  12     int16_t y;
  13     uint16_t width;
  14     uint16_t height;
  15 } QemuRect;
  16
  17 static inline void qemu_rect_init(QemuRect *rect,
  18                                   int16_t x, int16_t y,
  19                                   uint16_t width, uint16_t height)
  20 {
  21     rect->x = x;
  22     rect->y = y;
  23     rect->width = width;
  24     rect->height = height;
  25 }
  26
  27 static inline void qemu_rect_translate(QemuRect *rect,
  28                                        int16_t dx, int16_t dy)
  29 {
  30     rect->x += dx;
  31     rect->y += dy;
  32 }
  33
  34 static inline bool qemu_rect_intersect(const QemuRect *a, const QemuRect *b,
  35                                        QemuRect *res)
  36 {
  37     int16_t x1, x2, y1, y2;
  38
  39     x1 = MAX(a->x, b->x);
  40     y1 = MAX(a->y, b->y);
  41     x2 = MIN(a->x + a->width, b->x + b->width);
  42     y2 = MIN(a->y + a->height, b->y + b->height);
  43
  44     if (x1 >= x2 || y1 >= y2) {
  45         if (res) {
  46             qemu_rect_init(res, 0, 0, 0, 0);
  47         }
  48
  49         return false;
  50     }
  51
  52     if (res) {
  53         qemu_rect_init(res, x1, y1, x2 - x1, y2 - y1);
  54     }
  55
  56     return true;
  57 }
  58
  59 #endif