LibGfx: Allow ImageDecoders to expose their color space through CICP

This introduces a new API in ImageDecoderPlugins that allow an image
decoder to return a CICP struct. Also, we use this API in
ImageDecoder::color_space() to create a color space corresponding to
these CICP.

Libraries/LibGfx/ColorSpace.cpp

@@ -47,6 +47,34 @@ ColorSpace::ColorSpace(NonnullOwnPtr<Details::ColorSpaceImpl>&& color_space)
 {
 }
 
+ErrorOr<ColorSpace> ColorSpace::from_cicp(Media::CodingIndependentCodePoints cicp)
+{
+    // FIXME: Bail on invalid input
+
+    skcms_Matrix3x3 gamut = SkNamedGamut::kSRGB;
+    switch (cicp.color_primaries()) {
+    case Media::ColorPrimaries::BT709:
+        gamut = SkNamedGamut::kSRGB;
+        break;
+    case Media::ColorPrimaries::SMPTE432:
+        gamut = SkNamedGamut::kDisplayP3;
+        break;
+    default:
+        return Error::from_string_literal("FIXME: Unsupported color primaries");
+    }
+
+    skcms_TransferFunction transfer_function = SkNamedTransferFn::kSRGB;
+    switch (cicp.transfer_characteristics()) {
+    case Media::TransferCharacteristics::SRGB:
+        transfer_function = SkNamedTransferFn::kSRGB;
+        break;
+    default:
+        return Error::from_string_literal("FIXME: Unsupported transfer function");
+    }
+
+    return ColorSpace { make<Details::ColorSpaceImpl>(SkColorSpace::MakeRGB(transfer_function, gamut)) };
+}
+
 ErrorOr<ColorSpace> ColorSpace::load_from_icc_bytes(ReadonlyBytes icc_bytes)
 {
     if (icc_bytes.size() != 0) {

Libraries/LibGfx/ColorSpace.h

@@ -10,6 +10,7 @@
 #include <AK/Noncopyable.h>
 #include <AK/NonnullOwnPtr.h>
 #include <LibIPC/Forward.h>
+#include <LibMedia/Color/CodingIndependentCodePoints.h>
 
 namespace Gfx {
 
@@ -28,6 +29,7 @@ public:
     ColorSpace& operator=(ColorSpace&&);
     ~ColorSpace();
 
+    static ErrorOr<ColorSpace> from_cicp(Media::CodingIndependentCodePoints);
     static ErrorOr<ColorSpace> load_from_icc_bytes(ReadonlyBytes);
 
     // In order to keep this file free of Skia types, this function can't return

Libraries/LibGfx/ImageFormats/ImageDecoder.cpp

@@ -49,6 +49,10 @@ static ErrorOr<OwnPtr<ImageDecoderPlugin>> probe_and_sniff_for_appropriate_plugi
 
 ErrorOr<ColorSpace> ImageDecoder::color_space()
 {
+    auto maybe_cicp = TRY(m_plugin->cicp());
+    if (maybe_cicp.has_value())
+        return ColorSpace::from_cicp(*maybe_cicp);
+
     auto maybe_icc_data = TRY(icc_data());
     if (!maybe_icc_data.has_value())
         return ColorSpace {};

Libraries/LibGfx/ImageFormats/ImageDecoder.h

@@ -16,6 +16,7 @@
 #include <LibGfx/ColorSpace.h>
 #include <LibGfx/Size.h>
 #include <LibGfx/VectorGraphic.h>
+#include <LibMedia/Color/CodingIndependentCodePoints.h>
 
 namespace Gfx {
 
@@ -86,6 +87,7 @@ public:
 
     virtual Optional<Metadata const&> metadata() { return OptionalNone {}; }
 
+    virtual ErrorOr<Optional<Media::CodingIndependentCodePoints>> cicp() { return OptionalNone {}; }
     virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() { return OptionalNone {}; }
 
     virtual NaturalFrameFormat natural_frame_format() const { return NaturalFrameFormat::RGB; }