Add a GrCustomCoordsTextureEffect class

src/gpu/effects/GrCustomCoordsTextureEffect.h

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrCustomCoordsTextureEffect_DEFINED
+#define GrCustomCoordsTextureEffect_DEFINED
+
+#include "GrEffect.h"
+
+class GrGLCustomCoordsTextureEffect;
+
+/**
+ * The output color of this effect is a modulation of the input color and a sample from a texture.
+ * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input
+ * coords are a custom attribute.
+ */
+class GrCustomCoordsTextureEffect : public GrEffect {
+public:
+    static GrEffectRef* Create(GrTexture* tex, const GrTextureParams& p) {
+        AutoEffectUnref effect(SkNEW_ARGS(GrCustomCoordsTextureEffect, (tex, p)));
+        return CreateEffectRef(effect);
+    }
+
+    virtual ~GrCustomCoordsTextureEffect() {}
+
+    static const char* Name() { return "Texture"; }
+
+    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
+    typedef GrGLCustomCoordsTextureEffect GLEffect;
+
+    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
+
+private:
+    GrCustomCoordsTextureEffect(GrTexture* texture, const GrTextureParams& params);
+
+    virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE;
+
+    GrTextureAccess fTextureAccess;
+
+    GR_DECLARE_EFFECT_TEST;
+
+    typedef GrEffect INHERITED;
+};
+
+#endif