Bilinear optimization for 1D convolution.

src/gpu/effects/Gr1DKernelEffect.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef Gr1DKernelEffect_DEFINED
 #define Gr1DKernelEffect_DEFINED
 
@@ skipping 10 matching lines @@
  */
 
 class Gr1DKernelEffect : public GrSingleTextureEffect {
 
 public:
     enum Direction {
         kX_Direction,
         kY_Direction,
     };
 
+    // Constructor using default nearest-neighbor sampling for the input texture
+    // filter mode.
     Gr1DKernelEffect(GrTexture* texture,
                      Direction direction,
                      int radius)
         : INHERITED(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
         , fDirection(direction)
         , fRadius(radius) {}
 
+    Gr1DKernelEffect(GrTexture* texture,
+                     Direction direction,
+                     int radius,
+                     GrTextureParams::FilterMode filterMode)
+        : INHERITED(texture,
+                    GrCoordTransform::MakeDivByTextureWHMatrix(texture),
+                    filterMode)
+        , fDirection(direction)
+        , fRadius(radius) {}
+
     virtual ~Gr1DKernelEffect() {};
 
     static int WidthFromRadius(int radius) { return 2 * radius + 1; }
 
     int radius() const { return fRadius; }
     int width() const { return WidthFromRadius(fRadius); }
     Direction direction() const { return fDirection; }
 
     SkString dumpInfo() const override {
         SkString str;
         str.appendf("Direction: %s, Radius: %d ", kX_Direction == fDirection ? "X" : "Y", fRadius);
         str.append(INHERITED::dumpInfo());
         return str;
     }
 
 private:
 
     Direction       fDirection;
     int             fRadius;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif