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-rw-r--r--modules/stars/draw.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/modules/stars/draw.h b/modules/stars/draw.h
new file mode 100644
index 0000000..58a4a36
--- /dev/null
+++ b/modules/stars/draw.h
@@ -0,0 +1,32 @@
+#ifndef _DRAW_H
+#define _DRAW_H
+
+#include <stdint.h>
+
+#include "fb.h"
+
+/* helper for scaling rgb colors and packing them into an pixel */
+static inline uint32_t makergb(uint32_t r, uint32_t g, uint32_t b, float intensity)
+{
+ r = (((float)intensity) * r);
+ g = (((float)intensity) * g);
+ b = (((float)intensity) * b);
+
+ return (((r & 0xff) << 16) | ((g & 0xff) << 8) | (b & 0xff));
+}
+
+static inline int draw_pixel(fb_fragment_t *f, int x, int y, uint32_t pixel)
+{
+ uint32_t *pixels = f->buf;
+
+ if (y < 0 || y >= f->height || x < 0 || x >= f->width) {
+ return 0;
+ }
+
+ /* FIXME this assumes stride is aligned to 4 */
+ pixels[(y * f->width + (f->stride >> 2)) + x] = pixel;
+
+ return 1;
+}
+
+#endif
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