gfx::ColorSpace: Add getters

This change adds getters for currently stored primary ID, transfer
characteristics ID, matrix coefficient ID, and range ID. The change
also adds a test case for making sure they don't regress.

Bug: 1013590
Change-Id: I6da4d567591649e08a57e9bf8d6ed69f732bd26c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950974
Commit-Queue: Markus Handell <handellm@google.com>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721803}

ui/gfx/color_space.cc

@@ -514,6 +514,22 @@ sk_sp<SkColorSpace> ColorSpace::ToSkColorSpace() const {
   return sk_color_space;
 }
 
+ColorSpace::PrimaryID ColorSpace::GetPrimaryID() const {
+  return primaries_;
+}
+
+ColorSpace::TransferID ColorSpace::GetTransferID() const {
+  return transfer_;
+}
+
+ColorSpace::MatrixID ColorSpace::GetMatrixID() const {
+  return matrix_;
+}
+
+ColorSpace::RangeID ColorSpace::GetRangeID() const {
+  return range_;
+}
+
 // static
 void ColorSpace::GetPrimaryMatrix(PrimaryID primary_id,
                                   skcms_Matrix3x3* to_XYZD50) {

ui/gfx/color_space.h

@@ -270,6 +270,21 @@ class COLOR_SPACE_EXPORT ColorSpace {
   void GetTransferMatrix(SkMatrix44* matrix) const;
   void GetRangeAdjustMatrix(SkMatrix44* matrix) const;
 
+  // Returns the current primary ID.
+  // Note: if SetCustomPrimaries() has been used, the primary ID returned
+  // may have been set to PrimaryID::CUSTOM, or been coerced to another
+  // PrimaryID if it was very close.
+  PrimaryID GetPrimaryID() const;
+
+  // Returns the current transfer ID.
+  TransferID GetTransferID() const;
+
+  // Returns the current matrix ID.
+  MatrixID GetMatrixID() const;
+
+  // Returns the current range ID.
+  RangeID GetRangeID() const;
+
  private:
   static void GetPrimaryMatrix(PrimaryID, skcms_Matrix3x3* to_XYZD50);
   static bool GetTransferFunction(TransferID, skcms_TransferFunction* fn);

ui/gfx/color_space_unittest.cc

@@ -179,5 +179,15 @@ TEST(ColorSpace, MixedHDR10WithRec709) {
   EXPECT_EQ(color_space, expected_color_space);
 }
 
+TEST(ColorSpace, GetsPrimariesTransferMatrixAndRange) {
+  ColorSpace color_space(
+      ColorSpace::PrimaryID::BT709, ColorSpace::TransferID::BT709,
+      ColorSpace::MatrixID::BT709, ColorSpace::RangeID::LIMITED);
+  EXPECT_EQ(color_space.GetPrimaryID(), ColorSpace::PrimaryID::BT709);
+  EXPECT_EQ(color_space.GetTransferID(), ColorSpace::TransferID::BT709);
+  EXPECT_EQ(color_space.GetMatrixID(), ColorSpace::MatrixID::BT709);
+  EXPECT_EQ(color_space.GetRangeID(), ColorSpace::RangeID::LIMITED);
+}
+
 }  // namespace
 }  // namespace gfx