vh/HackBGRT
1
0
Fork 0
mirror of https://github.com/Metabolix/HackBGRT.git synced 2025-12-06 17:15:42 -08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Improve BMP handling

Browse Source
This commit is contained in:
Lauri Kenttä
2023-09-14 18:05:38 +03:00
parent 33e4450d19
commit 93eec1a250
2 changed files with 55 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

70
src/main.c
View File

@@ -194,6 +194,44 @@ static ACPI_BGRT* HandleAcpiTables(enum HackBGRT_action action, ACPI_BGRT* bgrt)
return bgrt;
}
/**
* Generate a BMP with the given size and color.
*
* @param w The width.
* @param h The height.
* @param r The red component.
* @param g The green component.
* @param b The blue component.
* @return The generated BMP, or 0 on failure.
*/
static BMP* MakeBMP(int w, int h, UINT8 r, UINT8 g, UINT8 b) {
BMP* bmp = 0;
BS->AllocatePool(EfiBootServicesData, 54 + w * h * 4, (void**) &bmp);
if (!bmp) {
Print(L"HackBGRT: Failed to allocate a blank BMP!\n");
BS->Stall(1000000);
return 0;
}
*bmp = (BMP) {
.magic_BM = { 'B', 'M' },
.file_size = 54 + w * h * 4,
.pixel_data_offset = 54,
.dib_header_size = 40,
.width = w,
.height = h,
.planes = 1,
.bpp = 32,
};
UINT8* data = (UINT8*) bmp + bmp->pixel_data_offset;
for (int y = 0; y < h; ++y) for (int x = 0; x < w; ++x) {
*data++ = b;
*data++ = g;
*data++ = r;
*data++ = 0;
}
return bmp;
}
/**
* Load a bitmap or generate a black one.
*
@@ -202,32 +240,22 @@ static ACPI_BGRT* HandleAcpiTables(enum HackBGRT_action action, ACPI_BGRT* bgrt)
* @return The loaded BMP, or 0 if not available.
*/
static BMP* LoadBMP(EFI_FILE_HANDLE root_dir, const CHAR16* path) {
BMP* bmp = 0;
if (!path) {
BS->AllocatePool(EfiBootServicesData, 58, (void**) &bmp);
if (!bmp) {
Print(L"HackBGRT: Failed to allocate a blank BMP!\n");
BS->Stall(1000000);
return 0;
}
CopyMem(
bmp,
"\x42\x4d\x3a\x00\x00\x00\x00\x00\x00\x00\x36\x00\x00\x00\x28\x00"
"\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x18\x00\x00\x00"
"\x00\x00\x04\x00\x00\x00\x13\x0b\x00\x00\x13\x0b\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
58
);
return bmp;
return MakeBMP(1, 1, 0, 0, 0); // empty path = black image
}
Debug(L"HackBGRT: Loading %s.\n", path);
bmp = LoadFile(root_dir, path, 0);
if (!bmp) {
UINTN size = 0;
BMP* bmp = LoadFile(root_dir, path, &size);
if (bmp) {
if (size >= bmp->file_size && CompareMem(bmp, "BM", 2) == 0 && bmp->file_size - bmp->pixel_data_offset > 4 && bmp->width && bmp->height && (bmp->bpp == 32 || bmp->bpp == 24) && bmp->compression == 0) {
return bmp;
}
Print(L"HackBGRT: Invalid BMP (%s)!\n", path);
} else {
Print(L"HackBGRT: Failed to load BMP (%s)!\n", path);
BS->Stall(1000000);
return 0;
}
return bmp;
BS->Stall(1000000);
return MakeBMP(16, 16, 255, 0, 0); // error = red image
}
/**

6
src/types.h
View File

@@ -52,6 +52,12 @@ typedef struct {
UINT32 height;
UINT16 planes;
UINT16 bpp;
UINT32 compression;
UINT32 image_size;
UINT32 x_pixels_per_meter;
UINT32 y_pixels_per_meter;
UINT32 colors_used;
UINT32 important_colors;
} BMP;
/**