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Support 2 bits per pixel BMP images

This commit is contained in:
Robbie Cooper 2022-10-19 13:58:23 -04:00
parent a8c805be29
commit f54c3d4287
1 changed files with 19 additions and 1 deletions
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20
modules/bmp/image_loader_bmp.cpp
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@ -58,6 +58,13 @@ Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
ERR_FAIL_COND_V_MSG(height % 8 != 0, ERR_UNAVAILABLE,
vformat("1-bpp BMP images must have a height that is a multiple of 8, but the imported BMP is %d pixels tall.", int(height)));
} else if (bits_per_pixel == 2) {
// Requires bit unpacking...
ERR_FAIL_COND_V_MSG(width % 4 != 0, ERR_UNAVAILABLE,
vformat("2-bpp BMP images must have a width that is a multiple of 4, but the imported BMP is %d pixels wide.", int(width)));
ERR_FAIL_COND_V_MSG(height % 4 != 0, ERR_UNAVAILABLE,
vformat("2-bpp BMP images must have a height that is a multiple of 4, but the imported BMP is %d pixels tall.", int(height)));
} else if (bits_per_pixel == 4) {
// Requires bit unpacking...
ERR_FAIL_COND_V_MSG(width % 2 != 0, ERR_UNAVAILABLE,
@ -88,7 +95,7 @@ Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
const uint32_t line_width = (width_bytes + 3) & ~3;
// The actual data traversal is determined by
// the data width in case of 8/4/1 bit images
// the data width in case of 8/4/2/1 bit images
const uint32_t w = bits_per_pixel >= 24 ? width : width_bytes;
const uint8_t *line = p_buffer + (line_width * (height - 1));
const uint8_t *end_buffer = p_buffer + p_header.bmp_file_header.bmp_file_size - p_header.bmp_file_header.bmp_file_offset;
@ -114,6 +121,17 @@ Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
index += 8;
line_ptr += 1;
} break;
case 2: {
uint8_t color_index = *line_ptr;
write_buffer[index + 0] = (color_index >> 6) & 3;
write_buffer[index + 1] = (color_index >> 4) & 3;
write_buffer[index + 2] = (color_index >> 2) & 3;
write_buffer[index + 3] = color_index & 3;
index += 4;
line_ptr += 1;
} break;
case 4: {
uint8_t color_index = *line_ptr;