smallsolar/u-boot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

video: Support transparency with 24bpp BMP image

Browse Source 
When the pixel colour matches the transparency colour, skip writing it
to the display.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-10-01 20:15:16 -06:00
parent dbf7444385
commit 5900eb7138
1 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/video/video_bmp.c
View File

@@ -388,6 +388,15 @@ static int draw_bmp(struct udevice *dev, ulong bmp_image, int x, int y,
u8 red = bmap[0];
u8 green = bmap[1];
u8 blue = bmap[2];
u32 pixel_color = (red << 16) |
(green << 8) | blue;
bmap += 3;
/* Skip transparent pixels if alpha enabled */
if (alpha && pixel_color == acolour) {
fb += bpix / 8;
continue;
}
if (bpix == 16) {
/* 16bit 565RGB format */
@@ -423,7 +432,6 @@ static int draw_bmp(struct udevice *dev, ulong bmp_image, int x, int y,
*fb++ = blue;
*fb++ = 0;
}
bmap += 3;
}
fb -= priv->line_length + width * (bpix / 8);
bmap += (padded_width - width);