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LibGfx/JPEG+CMYKBitmap: Extract the CMYK to RGB conversion code

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Right now, the JPEG decoder is the only one supporting CMYK, but that
won't last for long. So, let's move the conversion to CMYKBitmap.
This commit is contained in:
Lucas CHOLLET 2024-01-18 16:59:42 -05:00 • committed by Andrew Kaster
parent 0462858247
commit 09b2b3539b
3 changed files with 23 additions and 19 deletions
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20
Userland/Libraries/LibGfx/ImageFormats/JPEGLoader.cpp
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@ -1694,24 +1694,6 @@ static void invert_colors_for_adobe_images(JPEGLoadingContext const& context, Ve
}
}
static ErrorOr<void> cmyk_to_rgb(JPEGLoadingContext& context)
{
VERIFY(context.cmyk_bitmap);
VERIFY(!context.bitmap);
context.bitmap = TRY(Bitmap::create(BitmapFormat::BGRx8888, { context.frame.width, context.frame.height }));
for (int y = 0; y < context.frame.height; ++y) {
for (int x = 0; x < context.frame.width; ++x) {
auto const& cmyk = context.cmyk_bitmap->scanline(y)[x];
u8 k = 255 - cmyk.k;
context.bitmap->scanline(y)[x] = Color((255 - cmyk.c) * k / 255, (255 - cmyk.m) * k / 255, (255 - cmyk.y) * k / 255).value();
}
}
return {};
}
static void ycck_to_cmyk(Vector<Macroblock>& macroblocks)
{
// 7 - Conversions between colour encodings
@ -2026,7 +2008,7 @@ ErrorOr<ImageFrameDescriptor> JPEGImageDecoderPlugin::frame(size_t index, Option
}
if (m_context->cmyk_bitmap && !m_context->bitmap)
TRY(cmyk_to_rgb(*m_context));
return ImageFrameDescriptor { TRY(m_context->cmyk_bitmap->to_low_quality_rgb()), 0 };
return ImageFrameDescriptor { m_context->bitmap, 0 };
}