separate image manipulation code

include/framebuffer.h

@@ -0,0 +1,11 @@
+#ifndef __INCLUDE_FRAMEBUFFER_H__
+#define __INCLUDE_FRAMEBUFFER_H__
+
+#include <stdint.h>
+
+void fb_draw_pixel(uint16_t *image, uint16_t x, uint16_t y, uint16_t color);
+void fb_draw_line(uint16_t *image, int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color);
+void fb_load_image(uint16_t *dst, uint16_t *src, uint32_t length);
+void fb_set_image(uint16_t *dst, uint16_t value, uint32_t length);
+
+#endif