2D kernel initial wiring for Guassian

src/gpu/effects/GrMatrixConvolutionEffect.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrMatrixConvolutionEffect_DEFINED
 #define GrMatrixConvolutionEffect_DEFINED
 
 #include "GrSingleTextureEffect.h"
 
 // A little bit less than the minimum # uniforms required by DX9SM2 (32).
 // Allows for a 5x5 kernel (or 25x1, for that matter).
+// TODO make maximum kernel size a GLCap
 #define MAX_KERNEL_SIZE 25
 
 class GrGLMatrixConvolutionEffect;
 
 class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
 public:
     /*! \enum TileMode */
+    //TODO expand texture domain class to add ClampToColor and Repeat and then clean this up
     enum TileMode {
         kClamp_TileMode = 0,         /*!< Clamp to the image's edge pixels. */
         kRepeat_TileMode,        /*!< Wrap around to the image's opposite edge. */
         kClampToBlack_TileMode,  /*!< Fill with transparent black. */
         kMax_TileMode = kClampToBlack_TileMode
     };
 
     typedef GrMatrixConvolutionEffect::TileMode TileMode;
+
+    /// Convolve with arbitrary user specified kernel
     static GrEffect* Create(GrTexture* texture,
                             const SkIRect& bounds,
                             const SkISize& kernelSize,
                             const SkScalar* kernel,
                             SkScalar gain,
                             SkScalar bias,
                             const SkIPoint& kernelOffset,
                             TileMode tileMode,
-                            bool convolveAlpha) {
+                            bool convolveAlpha,
+                            bool useBounds) {
         return SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
                                                       bounds,
                                                       kernelSize,
                                                       kernel,
                                                       gain,
                                                       bias,
                                                       kernelOffset,
                                                       tileMode,
-                                                      convolveAlpha));
+                                                      convolveAlpha,
+                                                      useBounds));
     }
+
+    /// Convolve with a Gaussian kernel
+    static GrEffect* CreateGaussian(GrTexture* texture,
+                                    const SkIRect& bounds,
+                                    const SkISize& kernelSize,
+                                    SkScalar gain,
+                                    SkScalar bias,
+                                    const SkIPoint& kernelOffset,
+                                    TileMode tileMode,
+                                    bool convolveAlpha,
+                                    bool useBounds,
+                                    SkScalar sigmaX,
+                                    SkScalar sigmaY) {
+        return SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
+                                                      bounds,
+                                                      kernelSize,
+                                                      gain,
+                                                      bias,
+                                                      kernelOffset,
+                                                      tileMode,
+                                                      convolveAlpha,
+                                                      useBounds,
+                                                      sigmaX,
+                                                      sigmaY));
+    }
+
     virtual ~GrMatrixConvolutionEffect();
 
     virtual void getConstantColorComponents(GrColor* color,
                                             uint32_t* validFlags) const SK_OVERRIDE {
         // TODO: Try to do better?
         *validFlags = 0;
     }
 
     static const char* Name() { return "MatrixConvolution"; }
     const SkIRect& bounds() const { return fBounds; }
     const SkISize& kernelSize() const { return fKernelSize; }
     const float* kernelOffset() const { return fKernelOffset; }
     const float* kernel() const { return fKernel; }
     float gain() const { return fGain; }
     float bias() const { return fBias; }
     TileMode tileMode() const { return fTileMode; }
     bool convolveAlpha() const { return fConvolveAlpha; }
+    bool useBounds() const { return fUseBounds; }
 
     typedef GrGLMatrixConvolutionEffect GLEffect;
 
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
 
 private:
     GrMatrixConvolutionEffect(GrTexture*,
                               const SkIRect& bounds,
                               const SkISize& kernelSize,
                               const SkScalar* kernel,
                               SkScalar gain,
                               SkScalar bias,
                               const SkIPoint& kernelOffset,
                               TileMode tileMode,
-                              bool convolveAlpha);
+                              bool convolveAlpha,
+                              bool useBounds);
+
+    GrMatrixConvolutionEffect(GrTexture*,
+                              const SkIRect& bounds,
+                              const SkISize& kernelSize,
+                              SkScalar gain,
+                              SkScalar bias,
+                              const SkIPoint& kernelOffset,
+                              TileMode tileMode,
+                              bool convolveAlpha,
+                              bool useBounds,
+                              SkScalar sigmaX,
+                              SkScalar sigmaY);
 
     virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
 
     SkIRect  fBounds;
     SkISize  fKernelSize;
-    float   *fKernel;
+    float    fKernel[MAX_KERNEL_SIZE];
     float    fGain;
     float    fBias;
     float    fKernelOffset[2];
     TileMode fTileMode;
     bool     fConvolveAlpha;
+    bool     fUseBounds;
 
     GR_DECLARE_EFFECT_TEST;
 
     typedef GrSingleTextureEffect INHERITED;
 };
 
 #endif