Initial change to move 2D kernel to its own file.

BUG=skia:
R=bsalomon@chromium.org, senorblanco@chromium.org, bsalomon@google.com

Author: joshualitt@chromium.org

Review URL: https://codereview.chromium.org/379253003

1 files changed, 98 insertions, 0 deletions

diff --git a/src/gpu/effects/GrMatrixConvolutionEffect.h b/src/gpu/effects/GrMatrixConvolutionEffect.h
new file mode 100644
index 0000000000..6fdd85b7c7
--- /dev/null
+++ b/src/gpu/effects/GrMatrixConvolutionEffect.h
@@ -0,0 +1,98 @@
+/*
+ * 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).
+#define MAX_KERNEL_SIZE 25
+
+class GrGLMatrixConvolutionEffect;
+
+class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
+public:
+    /*! \enum TileMode */
+    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;
+    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) {
+        return SkNEW_ARGS(GrMatrixConvolutionEffect, (texture,
+                                                      bounds,
+                                                      kernelSize,
+                                                      kernel,
+                                                      gain,
+                                                      bias,
+                                                      kernelOffset,
+                                                      tileMode,
+                                                      convolveAlpha));
+    }
+    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; }
+
+    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);
+
+    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
+
+    SkIRect  fBounds;
+    SkISize  fKernelSize;
+    float   *fKernel;
+    float    fGain;
+    float    fBias;
+    float    fKernelOffset[2];
+    TileMode fTileMode;
+    bool     fConvolveAlpha;
+
+    GR_DECLARE_EFFECT_TEST;
+
+    typedef GrSingleTextureEffect INHERITED;
+};
+
+#endif