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video: Add a function to get the dimensions of a BMP image

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This is useful for some other users, so break this out into a function.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2022-10-06 08:36:17 -06:00 committed by Anatolij Gustschin
parent 430e1676a7
commit e90322f87c
2 changed files with 23 additions and 4 deletions
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16
drivers/video/video_bmp.c
View file

@ -229,6 +229,16 @@ static void video_splash_align_axis(int *axis, unsigned long panel_size,
*axis = max(0, (int)axis_alignment);
}
void video_bmp_get_info(void *bmp_image, ulong *widthp, ulong *heightp,
uint *bpixp)
{
struct bmp_image *bmp = bmp_image;
*widthp = get_unaligned_le32(&bmp->header.width);
*heightp = get_unaligned_le32(&bmp->header.height);
*bpixp = get_unaligned_le16(&bmp->header.bit_count);
}
int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
bool align)
{
@ -253,9 +263,7 @@ int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
return -EINVAL;
}
width = get_unaligned_le32(&bmp->header.width);
height = get_unaligned_le32(&bmp->header.height);
bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
video_bmp_get_info(bmp, &width, &height, &bmp_bpix);
hdr_size = get_unaligned_le16(&bmp->header.size);
debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);
palette = (void *)bmp + 14 + hdr_size;
@ -283,7 +291,7 @@ int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
!(bmp_bpix == 24 && bpix == 16) &&
!(bmp_bpix == 24 && bpix == 32)) {
printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
bpix, get_unaligned_le16(&bmp->header.bit_count));
bpix, colours);
return -EPERM;
}

11
include/video.h
View file

@ -223,6 +223,17 @@ int video_sync(struct udevice *vid, bool force);
*/
void video_sync_all(void);
/**
* video_bmp_get_info() - Get information about a bitmap image
*
* @bmp_image: Pointer to BMP image to check
* @widthp: Returns width in pixels
* @heightp: Returns height in pixels
* @bpixp: Returns log2 of bits per pixel
*/
void video_bmp_get_info(void *bmp_image, ulong *widthp, ulong *heightp,
uint *bpixp);
/**
* video_bmp_display() - Display a BMP file
*