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image: Allow saving CMYK jpegs

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`image` can't transform from RGB to CMYK yet, so the only way to
do this is by having a CMYK input.

For example, this works now (and it does a full decode and re-encode):

    Build/lagom/bin/image -o out.jpg \
        Tests/LibGfx/test-inputs/jpg/buggie-cmyk.jpg

Using this to convert `.pam` files written by `mutool extract`
to jpegs is a somewhat convenient method of looking at these
.pam files.
This commit is contained in:
Nico Weber 2024-01-31 20:55:51 -05:00 • committed by Andreas Kling
parent 2298aac1d1
commit 6dc5608d95
1 changed files with 13 additions and 4 deletions
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17
Userland/Utilities/image.cpp
View file

@ -125,15 +125,24 @@ static ErrorOr<OwnPtr<Core::MappedFile>> convert_image_profile(LoadedImage& imag
static ErrorOr<void> save_image(LoadedImage& image, StringView out_path, bool ppm_ascii, u8 jpeg_quality)
{
if (!image.bitmap.has<RefPtr<Gfx::Bitmap>>())
return Error::from_string_view("Can't save CMYK bitmaps yet, convert to RGB first with --convert-to-color-profile"sv);
auto& frame = image.bitmap.get<RefPtr<Gfx::Bitmap>>();
auto stream = [out_path]() -> ErrorOr<NonnullOwnPtr<Core::OutputBufferedFile>> {
auto output_stream = TRY(Core::File::open(out_path, Core::File::OpenMode::Write));
return Core::OutputBufferedFile::create(move(output_stream));
};
if (image.bitmap.has<RefPtr<Gfx::CMYKBitmap>>()) {
auto& cmyk_frame = image.bitmap.get<RefPtr<Gfx::CMYKBitmap>>();
if (out_path.ends_with(".jpg"sv, CaseSensitivity::CaseInsensitive) || out_path.ends_with(".jpeg"sv, CaseSensitivity::CaseInsensitive)) {
TRY(Gfx::JPEGWriter::encode(*TRY(stream()), *cmyk_frame, { .icc_data = image.icc_data, .quality = jpeg_quality }));
return {};
}
return Error::from_string_view("Can save CMYK bitmaps only as .jpg, convert to RGB first with --convert-to-color-profile"sv);
}
auto& frame = image.bitmap.get<RefPtr<Gfx::Bitmap>>();
if (out_path.ends_with(".jpg"sv, CaseSensitivity::CaseInsensitive) || out_path.ends_with(".jpeg"sv, CaseSensitivity::CaseInsensitive)) {
TRY(Gfx::JPEGWriter::encode(*TRY(stream()), *frame, { .icc_data = image.icc_data, .quality = jpeg_quality }));
return {};