2 files changed, 18 insertions, 0 deletions
diff --git a/include/gpu/GrFragmentProcessor.h b/include/gpu/GrFragmentProcessor.h
index 4b56fbf728..ffbf576dbe 100644
--- a/include/gpu/GrFragmentProcessor.h
+++ b/include/gpu/GrFragmentProcessor.h
@@ -65,6 +65,7 @@ public:
 
     GrFragmentProcessor()
         : INHERITED()
+        , fUsesDistanceVectorField(false)
         , fUsesLocalCoords(false)
         , fNumTexturesExclChildren(0)
         , fNumBuffersExclChildren(0)
@@ -110,6 +111,9 @@ public:
     /** Do any of the coordtransforms for this processor require local coords? */
     bool usesLocalCoords() const { return fUsesLocalCoords; }
 
+    /** Does this FP need a vector to the nearest edge? */
+    bool usesDistanceVectorField() const { return fUsesDistanceVectorField; }
+
     /** Returns true if this and other processor conservatively draw identically. It can only return
         true when the two processor are of the same subclass (i.e. they return the same object from
         from getFactory()).
@@ -173,6 +177,11 @@ protected:
      */
     virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const = 0;
 
+    /* Sub-classes should set this to true in their constructors if they need access to a distance
+     * vector field to the nearest edge
+     */
+    bool fUsesDistanceVectorField;
+
 private:
     void notifyRefCntIsZero() const final;
 
diff --git a/include/gpu/GrPaint.h b/include/gpu/GrPaint.h
index 8be1d50744..ca9ba59818 100644
--- a/include/gpu/GrPaint.h
+++ b/include/gpu/GrPaint.h
@@ -78,6 +78,11 @@ public:
     bool getAllowSRGBInputs() const { return fAllowSRGBInputs; }
 
     /**
+     * Does one of the fragment processors need a field of distance vectors to the nearest edge?
+     */
+    bool usesDistanceVectorField() const { return fUsesDistanceVectorField; }
+
+    /**
      * Should rendering be gamma-correct, end-to-end. Causes sRGB render targets to behave
      * as such (with linear blending), and sRGB inputs to be filtered and decoded correctly.
      */
@@ -101,6 +106,7 @@ public:
      */
     void addColorFragmentProcessor(sk_sp<GrFragmentProcessor> fp) {
         SkASSERT(fp);
+        fUsesDistanceVectorField |= fp->usesDistanceVectorField();
         fColorFragmentProcessors.push_back(std::move(fp));
     }
 
@@ -109,6 +115,7 @@ public:
      */
     void addCoverageFragmentProcessor(sk_sp<GrFragmentProcessor> fp) {
         SkASSERT(fp);
+        fUsesDistanceVectorField |= fp->usesDistanceVectorField();
         fCoverageFragmentProcessors.push_back(std::move(fp));
     }
 
@@ -142,6 +149,7 @@ public:
         fAntiAlias = paint.fAntiAlias;
         fDisableOutputConversionToSRGB = paint.fDisableOutputConversionToSRGB;
         fAllowSRGBInputs = paint.fAllowSRGBInputs;
+        fUsesDistanceVectorField = paint.fUsesDistanceVectorField;
 
         fColor = paint.fColor;
         fColorFragmentProcessors = paint.fColorFragmentProcessors;
@@ -168,6 +176,7 @@ private:
     bool                                      fAntiAlias;
     bool                                      fDisableOutputConversionToSRGB;
     bool                                      fAllowSRGBInputs;
+    bool                                      fUsesDistanceVectorField;
 
     GrColor4f                                 fColor;
 };