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Crop BMP to screen size

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This commit is contained in:
Lauri Kenttä
2023-09-14 18:07:48 +03:00
parent 93eec1a250
commit 661758ba58
1 changed files with 31 additions and 0 deletions
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31
src/main.c
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@@ -258,6 +258,34 @@ static BMP* LoadBMP(EFI_FILE_HANDLE root_dir, const CHAR16* path) {
return MakeBMP(16, 16, 255, 0, 0); // error = red image
}
/**
* Crop a BMP to the given size.
*
* @param bmp The BMP to crop.
* @param w The maximum width.
* @param h The maximum height.
*/
static void CropBMP(BMP* bmp, int w, int h) {
const int old_pitch = -(-(bmp->width * (bmp->bpp / 8)) & ~3);
bmp->image_size = 0;
bmp->width = min(bmp->width, w);
bmp->height = min(bmp->height, h);
const int h_max = (bmp->file_size - bmp->pixel_data_offset) / old_pitch;
bmp->height = min(bmp->height, h_max);
const int new_pitch = -(-(bmp->width * (bmp->bpp / 8)) & ~3);
if (new_pitch < old_pitch) {
for (int i = 1; i < bmp->height; ++i) {
CopyMem(
(UINT8*) bmp + bmp->pixel_data_offset + i * new_pitch,
(UINT8*) bmp + bmp->pixel_data_offset + i * old_pitch,
new_pitch
);
}
}
bmp->file_size = bmp->pixel_data_offset + bmp->height * new_pitch;
}
/**
* The main logic for BGRT modification.
*
@@ -316,6 +344,9 @@ void HackBgrt(EFI_FILE_HANDLE root_dir) {
return;
}
// Crop the image to screen.
CropBMP(new_bmp, config.resolution_x, config.resolution_y);
// Set the image address and orientation.
bgrt->image_address = (UINTN) new_bmp;
const int new_orientation = config.orientation == HackBGRT_coord_keep ? old_orientation : ((config.orientation / 90) & 3);