diff options
Diffstat (limited to 'apps/osmocomBB/osmocomBB/include/fb/fb_rgb332.h')
| -rw-r--r-- | apps/osmocomBB/osmocomBB/include/fb/fb_rgb332.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/apps/osmocomBB/osmocomBB/include/fb/fb_rgb332.h b/apps/osmocomBB/osmocomBB/include/fb/fb_rgb332.h new file mode 100644 index 0000000000..4df44e4ec1 --- /dev/null +++ b/apps/osmocomBB/osmocomBB/include/fb/fb_rgb332.h @@ -0,0 +1,47 @@ +#ifndef FB_RGB332_H +#define FB_RGB332_H + +/* RGB framebuffer with 1 byte per pixel, bits mapped as RRRGGGBB */ + +struct fb_rgb332 { + uint8_t *mem; /* set to backingstore memory */ + uint16_t damage_x1,damage_y1; /* current damage window, ul (incl) */ + uint16_t damage_x2,damage_y2; /* current damage window, lr (excl) */ +}; + +extern void fb_rgb332_clear(); + +/* draw a box from cursor to x,y */ +extern void fb_rgb332_boxto(uint16_t x,uint16_t y); +/* draw a line from cursor to x,y */ +extern void fb_rgb332_lineto(uint16_t x,uint16_t y); + +/* put string str onto framebuffer with line (bottom + left pixel of, e.g. "m") starting at cursor. + Maximum width consumed is maxwidth, actual width + needed is returned */ +extern int fb_rgb332_putstr(char *str,int maxwidth); + +extern struct fb_rgb332 *fb_rgb332; + +/* this convenience function can be used if you choose to + * back a RGB565 display with a RGB332 framebuffer to conserve + * ARM memory. It converts a rgb332 value to rgb565 as indicated + * in the comments. */ + +static inline uint16_t +rgb332_to_565(uint8_t rgb332){ + + uint8_t red = (rgb332 & 0xe0) >> 5 ; // rrr. .... -> .... .rrr + uint8_t green = ((rgb332 & 0x1c) >> 2); // ...g gg.. -> .... .ggg + uint8_t blue = rgb332 & 0x03; // .... ..bb -> .... ..bb + + red = (red << 2) | (red >> 1); /* .....210 -> ...21021 */ + green = (green << 3) | (green); /* .....210 -> ..210210 */ + blue = (blue << 3) | (blue << 1) | (blue >> 1); /* ......10 -> ...10101 */ + + /* rrrrrggg gggbbbbb */ + return (red << 11) | (green << 5) | blue; +} + +#endif |