Add isSingleComponent bool to getConstantColorComponent

Initial step to allowing effects to use/output 1 or 4 color/coverage components. This cl doesn't change any current logic and all effects still assume they are working with 4 components.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/3b8af078281a5a20f951b9fd84f38d92b8f6217b

Review URL: https://codereview.chromium.org/608253002

1 files changed, 5 insertions, 4 deletions

diff --git a/src/effects/SkPerlinNoiseShader.cpp b/src/effects/SkPerlinNoiseShader.cpp
index 88e6caddb9..43197dedf2 100644
--- a/src/effects/SkPerlinNoiseShader.cpp
+++ b/src/effects/SkPerlinNoiseShader.cpp
@@ -586,6 +586,11 @@ private:
                fPaintingData->fStitchDataInit == s.fPaintingData->fStitchDataInit;
     }
 
+    void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
+        inout->fValidFlags = 0; // This is noise. Nothing is constant.
+        inout->fIsSingleComponent = false;
+    }
+
     GrPerlinNoiseEffect(SkPerlinNoiseShader::Type type,
                         int numOctaves, bool stitchTiles,
                         SkPerlinNoiseShader::PaintingData* paintingData,
@@ -616,10 +621,6 @@ private:
     GrTextureAccess                 fNoiseAccess;
     SkPerlinNoiseShader::PaintingData *fPaintingData;
 
-    void getConstantColorComponents(GrColor*, uint32_t* validFlags) const SK_OVERRIDE {
-        *validFlags = 0; // This is noise. Nothing is constant.
-    }
-
 private:
     typedef GrFragmentProcessor INHERITED;
 };