altos: Add bitmap drawing code

[fw/altos] / src / draw / ao_rect.c

diff --git a/src/draw/ao_rect.c b/src/draw/ao_rect.c
new file mode 100644 (file)
index 0000000..71fa4ae
--- /dev/null
+++ b/src/draw/ao_rect.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao.h"
+#include "ao_draw.h"
+#include "ao_draw_int.h"
+
+void
+ao_rect(const struct ao_bitmap *dst,
+       int16_t                 x,
+       int16_t                 y,
+       int16_t                 width,
+       int16_t                 height,
+       uint32_t                fill,
+       uint8_t                 rop)
+{
+       int16_t x2 = x + width;
+       int16_t y2 = y + height;
+
+       ao_clip(x, 0, dst->width);
+       ao_clip(x2, 0, dst->width);
+       ao_clip(y, 0, dst->height);
+       ao_clip(y2, 0, dst->height);
+
+       if (x < x2 && y < y2) {
+               ao_solid(ao_and(rop, fill),
+                        ao_xor(rop, fill),
+                        dst->base + y * dst->stride,
+                        dst->stride,
+                        x,
+                        x2 - x,
+                        y2 - y);
+       }
+}
+