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LibGFX/PAM: Allow reading CMYK .pam files
These are written by `mutool extract` for CMYK images. They don't contain color profiles so they're not super convenient. But `image` can convert them (*) to sRGB as long as you use it with `--assign-color-profile` pointing to some CMYK icc profile of your choice. *: Once #22922 is merged.
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@ -19,13 +19,23 @@ ErrorOr<void> read_image_data(PAMLoadingContext& context)
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bool is_rgb = context.format_details.depth == 3 && context.format_details.tupl_type == "RGB"sv;
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bool is_rgba = context.format_details.depth == 4 && context.format_details.tupl_type == "RGB_ALPHA"sv;
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if (!is_gray && !is_gray_alpha && !is_rgb && !is_rgba)
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return Error::from_string_view("Unsupported PAM depth"sv);
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bool is_cmyk = context.format_details.depth == 4 && context.format_details.tupl_type == "CMYK"sv;
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TRY(create_bitmap(context));
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if (!is_gray && !is_gray_alpha && !is_rgb && !is_rgba && !is_cmyk)
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return Error::from_string_view("Unsupported PAM depth"sv);
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auto& stream = *context.stream;
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if (is_cmyk) {
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context.format_details.cmyk_bitmap = TRY(CMYKBitmap::create_with_size({ context.width, context.height }));
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CMYK* data = context.format_details.cmyk_bitmap.value()->begin();
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for (u64 i = 0; i < context.width * context.height; ++i) {
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Array<u8, 4> pixel;
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TRY(stream.read_until_filled(pixel));
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data[i] = { pixel[0], pixel[1], pixel[2], pixel[3] };
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}
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} else {
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TRY(create_bitmap(context));
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for (u64 i = 0; i < context.width * context.height; ++i) {
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if (is_gray) {
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Array<u8, 1> pixel;
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@ -45,6 +55,7 @@ ErrorOr<void> read_image_data(PAMLoadingContext& context)
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context.bitmap->set_pixel(i % context.width, i / context.width, { pixel[0], pixel[1], pixel[2], pixel[3] });
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}
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}
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}
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context.state = PAMLoadingContext::State::BitmapDecoded;
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return {};
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@ -18,6 +18,7 @@ struct PAM {
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u16 max_val { 0 };
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u16 depth { 0 };
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String tupl_type {};
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Optional<NonnullRefPtr<CMYKBitmap>> cmyk_bitmap {};
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};
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using PAMLoadingContext = PortableImageMapLoadingContext<PAM>;
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@ -62,6 +62,9 @@ public:
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
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virtual NaturalFrameFormat natural_frame_format() const override;
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virtual ErrorOr<NonnullRefPtr<CMYKBitmap>> cmyk_frame() override;
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private:
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PortableImageDecoderPlugin(NonnullOwnPtr<SeekableStream> stream);
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@ -126,8 +129,45 @@ ErrorOr<ImageFrameDescriptor> PortableImageDecoderPlugin<TContext>::frame(size_t
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}
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}
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if constexpr (requires { TContext::FormatDetails::cmyk_bitmap; }) {
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if (m_context->format_details.cmyk_bitmap.has_value())
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m_context->bitmap = TRY(m_context->format_details.cmyk_bitmap.value()->to_low_quality_rgb());
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}
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VERIFY(m_context->bitmap);
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return ImageFrameDescriptor { m_context->bitmap, 0 };
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}
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template<typename TContext>
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NaturalFrameFormat PortableImageDecoderPlugin<TContext>::natural_frame_format() const
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{
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if constexpr (requires { TContext::FormatDetails::cmyk_bitmap; }) {
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if (m_context->format_details.depth == 4 && m_context->format_details.tupl_type == "CMYK"sv)
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return NaturalFrameFormat::CMYK;
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}
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return NaturalFrameFormat::RGB;
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}
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template<typename TContext>
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ErrorOr<NonnullRefPtr<CMYKBitmap>> PortableImageDecoderPlugin<TContext>::cmyk_frame()
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{
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if constexpr (requires { TContext::FormatDetails::cmyk_bitmap; }) {
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VERIFY(natural_frame_format() == NaturalFrameFormat::CMYK);
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if (m_context->state == TContext::State::Error)
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return Error::from_string_literal("PortableImageDecoderPlugin: Decoding failed");
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if (m_context->state < TContext::State::BitmapDecoded) {
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if (decode(*m_context).is_error()) {
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m_context->state = TContext::State::Error;
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return Error::from_string_literal("PortableImageDecoderPlugin: Decoding failed");
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}
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}
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return *m_context->format_details.cmyk_bitmap.value();
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}
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VERIFY_NOT_REACHED();
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}
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}
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