git.gag.com Git - fw/altos/blob - src/draw/ao_rect.c

   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao.h"
  16 #include "ao_draw.h"
  17 #include "ao_draw_int.h"
  18
  19 #define bound(val,max) do {                     \
  20                 if (val < 0) {                  \
  21                         val = 0;                \
  22                 }                               \
  23                 if (val > max) {                \
  24                         val = max;              \
  25                 }                               \
  26         } while (0)
  27
  28 void
  29 ao_rect(const struct ao_bitmap  *dst,
  30         int16_t                 x,
  31         int16_t                 y,
  32         int16_t                 width,
  33         int16_t                 height,
  34         uint32_t                fill,
  35         uint8_t                 rop)
  36 {
  37         int16_t x2 = x + width;
  38         int16_t y2 = y + height;
  39
  40         bound(x, dst->width);
  41         bound(x2, dst->width);
  42         bound(y, dst->height);
  43         bound(y2, dst->height);
  44
  45         if (x < x2 && y < y2) {
  46                 ao_solid(ao_and(rop, fill),
  47                          ao_xor(rop, fill),
  48                          dst->base + y * dst->stride,
  49                          dst->stride,
  50                          x,
  51                          x2 - x,
  52                          y2 - y);
  53         }
  54 }
  55