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, 5 deletions

diff --git a/src/core/SkXfermode.cpp b/src/core/SkXfermode.cpp
index 8a3218fcbd..1d151e4dba 100644
--- a/src/core/SkXfermode.cpp
+++ b/src/core/SkXfermode.cpp
@@ -799,11 +799,6 @@ public:
         }
     }
 
-    virtual void getConstantColorComponents(GrColor* color,
-                                            uint32_t* validFlags) const SK_OVERRIDE {
-        *validFlags = 0;
-    }
-
     virtual const GrBackendFragmentProcessorFactory& getFactory() const SK_OVERRIDE {
         return GrTBackendFragmentProcessorFactory<XferEffect>::getInstance();
     }
@@ -1216,6 +1211,11 @@ private:
         return fMode == s.fMode &&
                fBackgroundAccess.getTexture() == s.fBackgroundAccess.getTexture();
     }
+    
+    virtual void onComputeInvariantOutput(InvariantOutput* inout) const SK_OVERRIDE {
+        inout->fValidFlags = 0;
+        inout->fIsSingleComponent = false;
+    }
 
     SkXfermode::Mode fMode;
     GrCoordTransform fBackgroundTransform;