mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-09-23 09:48:56 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

LibGfx: Add support for YCCK jpeg files

Browse source
This commit is contained in:
aplefull 2025-03-10 10:26:12 +01:00 • committed by Alexander Kalenik
commit 19bee8393d
Notes: github-actions[bot] 2025-03-22 16:36:27 +00:00
1 changed files with 34 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

35
Libraries/LibGfx/ImageFormats/JPEGLoader.cpp
View file

@ -81,8 +81,10 @@ ErrorOr<void> JPEGLoadingContext::decode()
if (jpeg_read_header(&cinfo, TRUE) != JPEG_HEADER_OK)
return Error::from_string_literal("Failed to read JPEG header");
if (cinfo.jpeg_color_space == JCS_CMYK || cinfo.jpeg_color_space == JCS_YCCK) {
if (cinfo.jpeg_color_space == JCS_CMYK) {
cinfo.out_color_space = JCS_CMYK;
} else if (cinfo.jpeg_color_space == JCS_YCCK) {
cinfo.out_color_space = JCS_YCCK;
} else {
cinfo.out_color_space = JCS_EXT_BGRX;
}
@ -112,6 +114,37 @@ ErrorOr<void> JPEGLoadingContext::decode()
break;
}
}
// If image is in YCCK color space, we convert it to CMYK
// and then CMYK code path will handle the rest
if (cinfo.out_color_space == JCS_YCCK) {
for (int i = 0; i < cmyk_bitmap->size().height(); ++i) {
for (int j = 0; j < cmyk_bitmap->size().width(); ++j) {
auto const& cmyk = cmyk_bitmap->scanline(i)[j];
auto y = cmyk.c;
auto cb = cmyk.m;
auto cr = cmyk.y;
auto k = cmyk.k;
int r = y + 1.402f * (cr - 128);
int g = y - 0.3441f * (cb - 128) - 0.7141f * (cr - 128);
int b = y + 1.772f * (cb - 128);
y = clamp(r, 0, 255);
cb = clamp(g, 0, 255);
cr = clamp(b, 0, 255);
k = 255 - k;
cmyk_bitmap->scanline(i)[j] = {
y,
cb,
cr,
k,
};
}
}
}
}
JOCTET* icc_data_ptr = nullptr;