altos/draw: Add transforms to polygon code

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

diff --git a/src/draw/ao_draw.h b/src/draw/ao_draw.h
index 92150fc1aa9a0f8a772d3d6daed2b8e4434dc8a7..b4ca6eacc64c106ac74cf1088da764150aa541b1 100644 (file)
--- a/src/draw/ao_draw.h
+++ b/src/draw/ao_draw.h
@@ -15,6 +15,10 @@
 #ifndef _AO_DRAW_H_
 #define _AO_DRAW_H_
 
+#include <stdint.h>
+#include <stdbool.h>
+#include "ao_font.h"
+
 struct ao_bitmap {
        uint32_t        *base;
        int16_t         stride; /* in units */
@@ -22,10 +26,82 @@ struct ao_bitmap {
        int16_t         height; /* in pixels */
 };
 
+struct ao_coord {
+       float   x, y;
+};
+
+struct ao_transform {
+       float   x_scale, x_off;
+       float   y_scale, y_off;
+};
+
+static inline float ao_t_x(float x, float y, const struct ao_transform *t)
+{
+       (void) y;
+       return x * t->x_scale + t->x_off;
+}
+
+static inline int16_t ao_t_xi(float x, float y, const struct ao_transform *t)
+{
+       return (int16_t) (ao_t_x(x, y, t) + 0.5f);
+}
+
+static inline float ao_t_y(float x, float y, const struct ao_transform *t)
+{
+       (void) x;
+       return y * t->y_scale + t->y_off;
+}
+
+static inline int16_t ao_t_yi(float x, float y, const struct ao_transform *t)
+{
+       return (int16_t) (ao_t_y(x, y, t) + 0.5f);
+}
+
+static inline float ao_t_x_c(const struct ao_coord     *c,
+                            const struct ao_transform  *t)
+{
+       return ao_t_x(c->x, c->y, t);
+}
+
+static inline float ao_t_y_c(const struct ao_coord     *c,
+                            const struct ao_transform  *t)
+{
+       return ao_t_y(c->x, c->y, t);
+}
+
+static inline int16_t
+ao_stride(int16_t width)
+{
+       return (int16_t) ((width + 31) >> 5);
+}
+
+static inline int16_t
+ao_stride_bytes(int16_t width)
+{
+       return (int16_t) ((width + 7) >> 3);
+}
+
 struct ao_pattern {
        uint8_t         pattern[8];
 };
 
+struct ao_glyph_metrics {
+       int8_t  width;
+       int8_t  height;
+       int8_t  x_off;
+       int8_t  y_off;
+       int8_t  advance;
+};
+
+struct ao_font {
+       const uint8_t   *bytes;
+       const uint16_t  *pos;
+       const struct ao_glyph_metrics *metrics;
+       int16_t max_width;
+       int16_t max_height;
+       int16_t ascent;
+};
+
 void
 ao_copy(const struct ao_bitmap *dst,
        int16_t                 dst_x,
@@ -66,22 +142,31 @@ ao_line(const struct ao_bitmap     *dst,
        uint32_t                fill,
        uint8_t                 rop);
 
+void
+ao_poly(const struct ao_bitmap         *dst,
+       const struct ao_coord           *coords,
+       uint16_t                        ncoords,
+       const struct ao_transform       *transform,
+       uint32_t                        fill,
+       uint8_t                         rop);
+
 void
 ao_text(const struct ao_bitmap *dst,
+       const struct ao_font    *font,
        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;
-};
+void
+ao_logo(const struct ao_bitmap         *dst,
+       const struct ao_transform       *transform,
+       const struct ao_font            *font,
+       uint32_t                        fill,
+       uint8_t                         rop);
 
-extern const struct ao_font ao_font;
+extern const struct ao_transform ao_identity;
 
 #define AO_SHIFT       5
 #define AO_UNIT                (1 << AO_SHIFT)