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Fix BMP loader to distinguish between compression types 

Some of the values in compression enumeration represent uncompressed formats:

https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/4e588f70-bd92-4a6f-b77f-35d0feaf7a57

This allows the loader to proceed with uncompressed formats.
Note that loading compressed BMP's is still not supported.
This commit is contained in:
Andrii Doroshenko (Xrayez) 2019-07-17 20:28:35 +03:00
parent d087a9e328
commit 422a8ffe02
2 changed files with 14 additions and 12 deletions
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14
modules/bmp/image_loader_bmp.cpp
View File

@ -47,9 +47,6 @@ Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
size_t height = (size_t)p_header.bmp_info_header.bmp_height;
size_t bits_per_pixel = (size_t)p_header.bmp_info_header.bmp_bit_count;
if (p_header.bmp_info_header.bmp_compression != BI_RGB) {
err = FAILED;
}
// Check whether we can load it
if (bits_per_pixel == 1) {
@ -238,11 +235,16 @@ Error ImageLoaderBMP::load_image(Ref<Image> p_image, FileAccess *f,
bmp_header.bmp_info_header.bmp_colors_used = f->get_32();
bmp_header.bmp_info_header.bmp_important_colors = f->get_32();
// Compressed bitmaps not supported, stop parsing
if (bmp_header.bmp_info_header.bmp_compression != BI_RGB) {
ERR_EXPLAIN("Unsupported bmp file: " + f->get_path());
switch (bmp_header.bmp_info_header.bmp_compression) {
case BI_RLE8:
case BI_RLE4:
case BI_CMYKRLE8:
case BI_CMYKRLE4: {
// Stop parsing
ERR_EXPLAIN("Compressed BMP files are not supported: " + f->get_path());
f->close();
ERR_FAIL_V(ERR_UNAVAILABLE);
} break;
}
// Don't rely on sizeof(bmp_file_header) as structure padding
// adds 2 bytes offset leading to misaligned color table reading

8
modules/bmp/image_loader_bmp.h
View File

@ -42,15 +42,15 @@ protected:
enum bmp_compression_s {
BI_RGB = 0x00,
BI_RLE8 = 0x01,
BI_RLE4 = 0x02,
BI_RLE8 = 0x01, // compressed
BI_RLE4 = 0x02, // compressed
BI_BITFIELDS = 0x03,
BI_JPEG = 0x04,
BI_PNG = 0x05,
BI_ALPHABITFIELDS = 0x06,
BI_CMYK = 0x0b,
BI_CMYKRLE8 = 0x0c,
BI_CMYKRLE4 = 0x0d
BI_CMYKRLE8 = 0x0c, // compressed
BI_CMYKRLE4 = 0x0d // compressed
};
struct bmp_header_s {