altos: Add bitmap drawing code

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

diff --git a/src/draw/ao_text.c b/src/draw/ao_text.c
new file mode 100644 (file)
index 0000000..7ce2a62
--- /dev/null
+++ b/src/draw/ao_text.c
@@ -0,0 +1,65 @@
+/*
+ * 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"
+#include "ao_font.h"
+
+const struct ao_font ao_font = {
+       .width = GLYPH_WIDTH,
+       .height = GLYPH_HEIGHT,
+       .ascent = GLYPH_ASCENT,
+       .descent = GLYPH_HEIGHT - GLYPH_ASCENT,
+};
+
+void
+ao_text(const struct ao_bitmap *dst,
+       int16_t                 x,
+       int16_t                 y,
+       char                    *string,
+       uint32_t                fill,
+       uint8_t                 rop)
+{
+       uint32_t        src[GLYPH_HEIGHT];
+       char            c;
+       int             h;
+
+       struct ao_bitmap        src_bitmap = {
+               .base = src,
+               .stride = 1,
+               .width = GLYPH_WIDTH,
+               .height = GLYPH_HEIGHT
+       };
+
+       y -= GLYPH_ASCENT;
+
+       rop = (rop & 3) | 0x4;
+
+       if ((fill&1) == 0)
+               rop ^= 3;
+
+       while ((c = *string++)) {
+               const uint8_t   *bytes = &glyph_bytes[glyph_pos[(uint8_t) c]];
+
+               for (h = 0; h < GLYPH_HEIGHT; h++)
+                       src[h] = bytes[h];
+
+               ao_copy(dst,
+                       x, y, GLYPH_WIDTH, GLYPH_HEIGHT,
+                       &src_bitmap,
+                       0, 0, rop);
+               x += GLYPH_WIDTH;
+       }
+}