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graphic_utils: add rgba support 

this will allow to render rgba image with or without hw support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-09-12 15:42:46 +02:00 committed by Sascha Hauer
parent a60803de67
commit 2beb82f88a
2 changed files with 106 additions and 0 deletions
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3
include/graphic_utils.h
View File

@ -7,8 +7,11 @@
#ifndef __GRAPHIC_UTILS_H__
#define __GRAPHIC_UTILS_H__
void rgba_blend(struct fb_info *info, void *image, void* dest, int height,
int width, int startx, int starty, bool is_rgba);
void set_pixel(struct fb_info *info, void *adr, u32 px);
void set_rgb_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b);
void set_rgba_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b, u8 a);
void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size);
#endif /* __GRAPHIC_UTILS_H__ */

103
lib/graphic_utils.c
View File

@ -62,6 +62,37 @@ void memset_pixel(struct fb_info *info, void* buf, u32 color, size_t size)
}
}
static void get_rgb_pixel(struct fb_info *info, void *adr, u8 *r ,u8 *g, u8 *b)
{
u32 px;
u32 rmask, gmask, bmask;
switch (info->bits_per_pixel) {
case 16:
px = *(u16 *)adr;
break;
case 32:
px = *(u32 *)adr;
break;
case 8:
default:
return;
}
rmask = (0xff >> (8 - info->blue.length)) << info->blue.offset |
(0xff >> (8 - info->green.length)) << info->green.offset;
gmask = (0xff >> (8 - info->red.length)) << info->red.offset |
(0xff >> (8 - info->blue.length)) << info->blue.offset;
bmask = (0xff >> (8 - info->red.length)) << info->red.offset |
(0xff >> (8 - info->green.length)) << info->green.offset;
*r = ((px & ~rmask) >> info->red.offset) << (8 - info->red.length);
*g = ((px & ~gmask) >> info->green.offset) << (8 - info->green.length);
*b = ((px & ~bmask) >> info->blue.offset) << (8 - info->blue.length);
}
void set_pixel(struct fb_info *info, void *adr, u32 px)
{
switch (info->bits_per_pixel) {
@ -86,3 +117,75 @@ void set_rgb_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b)
set_pixel(info, adr, px);
}
static u8 alpha_mux(int s, int d, int a)
{
return (d * a + s * (255 - a)) >> 8;
}
void set_rgba_pixel(struct fb_info *info, void *adr, u8 r, u8 g, u8 b, u8 a)
{
u32 px = 0x0;
if (!a)
return;
if (a != 0xff) {
if (info->transp.length) {
px |= (a >> (8 - info->transp.length)) << info->transp.offset;
} else {
u8 sr = 0;
u8 sg = 0;
u8 sb = 0;
get_rgb_pixel(info, adr, &sr, &sg, &sb);
r = alpha_mux(sr, r, a);
g = alpha_mux(sg, g, a);
b = alpha_mux(sb, b, a);
set_rgb_pixel(info, adr, r, g, b);
return;
}
}
px |= (r >> (8 - info->red.length)) << info->red.offset |
(g >> (8 - info->green.length)) << info->green.offset |
(b >> (8 - info->blue.length)) << info->blue.offset;
set_pixel(info, adr, px);
}
void rgba_blend(struct fb_info *info, void *image, void* buf, int height,
int width, int startx, int starty, bool is_rgba)
{
unsigned char *adr;
int x, y;
int xres;
int img_byte_per_pixel = 3;
if (is_rgba)
img_byte_per_pixel++;
xres = info->xres;
for (y = 0; y < height; y++) {
adr = buf + ((y + starty) * xres + startx) *
(info->bits_per_pixel >> 3);
for (x = 0; x < width; x++) {
char *pixel;
pixel = image;
if (is_rgba)
set_rgba_pixel(info, adr, pixel[0], pixel[1],
pixel[2], pixel[3]);
else
set_rgb_pixel(info, adr, pixel[0], pixel[1],
pixel[2]);
adr += info->bits_per_pixel >> 3;
image += img_byte_per_pixel;
}
}
}