Add SkColorSpace_Base::makeColorSpin

This is a utility that creates a version of an existing XYZ color space
that performs our color spin operation. Assigning this to a source remaps
RGB to GBR. Assigning it to a destination does the opposite (RGB to BRG).

Bug: skia:
Change-Id: I3528698220bd32aa01dcd3db225e60f151a4b5bd
Reviewed-on: https://skia-review.googlesource.com/71280
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 1 insertions, 13 deletions

diff --git a/dm/DM.cpp b/dm/DM.cpp
index 77538cfdc3..2ef7dc97fa 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -919,19 +919,7 @@ static sk_sp<SkColorSpace> adobe_rgb() {
 }
 
 static sk_sp<SkColorSpace> rgb_to_gbr() {
-    float gbr[9];
-    gbr[0] = gSRGB_toXYZD50[1];
-    gbr[1] = gSRGB_toXYZD50[2];
-    gbr[2] = gSRGB_toXYZD50[0];
-    gbr[3] = gSRGB_toXYZD50[4];
-    gbr[4] = gSRGB_toXYZD50[5];
-    gbr[5] = gSRGB_toXYZD50[3];
-    gbr[6] = gSRGB_toXYZD50[7];
-    gbr[7] = gSRGB_toXYZD50[8];
-    gbr[8] = gSRGB_toXYZD50[6];
-    SkMatrix44 toXYZD50(SkMatrix44::kUninitialized_Constructor);
-    toXYZD50.set3x3RowMajorf(gbr);
-    return SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma, toXYZD50);
+    return as_CSB(SkColorSpace::MakeSRGB())->makeColorSpin();
 }
 
 static Sink* create_via(const SkString& tag, Sink* wrapped) {