blob: 4df44e4ec1b74251a71b11f051b8bdf78823b295 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
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
|
