add support for high quality image filtering on the GPU

R=bsalomon@google.com, reed@google.com

Review URL: https://codereview.chromium.org/23779003

git-svn-id: http://skia.googlecode.com/svn/trunk@11087 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 69 insertions, 0 deletions

diff --git a/src/gpu/effects/GrBicubicEffect.h b/src/gpu/effects/GrBicubicEffect.h
new file mode 100644
index 0000000000..618ef1a779
--- /dev/null
+++ b/src/gpu/effects/GrBicubicEffect.h
@@ -0,0 +1,69 @@
+/*
+ * 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 GrBicubicTextureEffect_DEFINED
+#define GrBicubicTextureEffect_DEFINED
+
+#include "GrSingleTextureEffect.h"
+#include "GrDrawEffect.h"
+#include "gl/GrGLEffect.h"
+#include "gl/GrGLEffectMatrix.h"
+#include "GrTBackendEffectFactory.h"
+
+class GrGLBicubicEffect;
+
+class GrBicubicEffect : public GrSingleTextureEffect {
+public:
+    virtual ~GrBicubicEffect();
+
+    static const char* Name() { return "Bicubic"; }
+    const float* coefficients() const { return fCoefficients; }
+
+    typedef GrGLBicubicEffect GLEffect;
+
+    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
+    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
+    static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) {
+        AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients)));
+        return CreateEffectRef(effect);
+    }
+
+    static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16], 
+                               const SkMatrix& matrix,
+                               const GrTextureParams& p,
+                               CoordsType coordsType = kLocal_CoordsType) {
+        AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, p, coordsType)));
+        return CreateEffectRef(effect);
+    }
+
+    static GrEffectRef* Create(GrTexture* tex) {
+        return Create(tex, gMitchellCoefficients);
+    }
+
+    static GrEffectRef* Create(GrTexture* tex, 
+                               const SkMatrix& matrix,
+                               const GrTextureParams& p,
+                               CoordsType coordsType = kLocal_CoordsType) {
+        return Create(tex, gMitchellCoefficients, matrix, p, coordsType);
+    }
+
+private:
+    GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]);
+    GrBicubicEffect(GrTexture*, const SkScalar coefficients[16], 
+                    const SkMatrix &matrix, const GrTextureParams &p, CoordsType coordsType);
+    virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
+    float    fCoefficients[16];
+
+    GR_DECLARE_EFFECT_TEST;
+    
+    static const SkScalar gMitchellCoefficients[16];
+
+    typedef GrSingleTextureEffect INHERITED;
+};
+
+#endif