altos: Add bitmap drawing code

[fw/altos] / src / draw / ao_draw.h

diff --git a/src/draw/ao_draw.h b/src/draw/ao_draw.h
new file mode 100644 (file)
index 0000000..92150fc
--- /dev/null
+++ b/src/draw/ao_draw.h
@@ -0,0 +1,119 @@
+/*
+ * 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.
+ */
+
+#ifndef _AO_DRAW_H_
+#define _AO_DRAW_H_
+
+struct ao_bitmap {
+       uint32_t        *base;
+       int16_t         stride; /* in units */
+       int16_t         width;  /* in pixels */
+       int16_t         height; /* in pixels */
+};
+
+struct ao_pattern {
+       uint8_t         pattern[8];
+};
+
+void
+ao_copy(const struct ao_bitmap *dst,
+       int16_t                 dst_x,
+       int16_t                 dst_y,
+       int16_t                 width,
+       int16_t                 height,
+       const struct ao_bitmap  *src,
+       int16_t                 src_x,
+       int16_t                 src_y,
+       uint8_t                 rop);
+
+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);
+
+void
+ao_pattern(const struct ao_bitmap      *dst,
+          int16_t                      x,
+          int16_t                      y,
+          int16_t                      width,
+          int16_t                      height,
+          const struct ao_pattern      *pattern,
+          int16_t                      pat_x,
+          int16_t                      pat_y,
+          uint8_t                      rop);
+
+void
+ao_line(const struct ao_bitmap *dst,
+       int16_t                 x1,
+       int16_t                 y1,
+       int16_t                 x2,
+       int16_t                 y2,
+       uint32_t                fill,
+       uint8_t                 rop);
+
+void
+ao_text(const struct ao_bitmap *dst,
+       int16_t                 x,
+       int16_t                 y,
+       char                    *string,
+       uint32_t                fill,
+       uint8_t                 rop);
+
+struct ao_font {
+       int     width;
+       int     height;
+       int     ascent;
+       int     descent;
+};
+
+extern const struct ao_font ao_font;
+
+#define AO_SHIFT       5
+#define AO_UNIT                (1 << AO_SHIFT)
+#define AO_MASK                (AO_UNIT - 1)
+#define AO_ALLONES     ((uint32_t) -1)
+
+/*
+ *         dst
+ *        0   1
+ *
+ *     0  a   b
+ *  src
+ *     1  c   d
+ *
+ *     ROP = abcd
+ */
+
+#define AO_CLEAR         0x0   /* 0 */
+#define AO_AND           0x1   /* src AND dst */
+#define AO_AND_REVERSE   0x2   /* src AND NOT dst */
+#define AO_COPY          0x3   /* src */
+#define AO_AND_INVERTED  0x4   /* NOT src AND dst */
+#define AO_NOOP          0x5   /* dst */
+#define AO_XOR           0x6   /* src XOR dst */
+#define AO_OR            0x7   /* src OR dst */
+#define AO_NOR           0x8   /* NOT src AND NOT dst */
+#define AO_EQUIV         0x9   /* NOT src XOR dst */
+#define AO_INVERT        0xa   /* NOT dst */
+#define AO_OR_REVERSE    0xb   /* src OR NOT dst */
+#define AO_COPY_INVERTED 0xc   /* NOT src */
+#define AO_OR_INVERTED   0xd   /* NOT src OR dst */
+#define AO_NAND          0xe   /* NOT src OR NOT dst */
+#define AO_SET           0xf   /* 1 */
+
+#endif /* _AO_DRAW_H_ */