The Tor Browser: gfx/skia/trunk/src/gpu/effects/GrDistanceFieldTextureEffect.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2013 Google Inc.

     3  *

     4  * Use of this source code is governed by a BSD-style license that can be

     5  * found in the LICENSE file.

     6  */

     8 #ifndef GrDistanceFieldTextureEffect_DEFINED

     9 #define GrDistanceFieldTextureEffect_DEFINED

    11 #include "GrEffect.h"

    12 #include "GrVertexEffect.h"

    14 class GrGLDistanceFieldTextureEffect;

    16 /**

    17  * The output color of this effect is a modulation of the input color and a sample from a

    18  * distance field texture (using a smoothed step function near 0.5).

    19  * It allows explicit specification of the filtering and wrap modes (GrTextureParams). The input

    20  * coords are a custom attribute.

    21  */

    22 class GrDistanceFieldTextureEffect : public GrVertexEffect {

    23 public:

    24     static GrEffectRef* Create(GrTexture* tex, const GrTextureParams& p, const SkISize& s) {

    25         AutoEffectUnref effect(SkNEW_ARGS(GrDistanceFieldTextureEffect, (tex, p, s)));

    26         return CreateEffectRef(effect);

    27     }

    29     virtual ~GrDistanceFieldTextureEffect() {}

    31     static const char* Name() { return "DistanceFieldTexture"; }

    33     virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;

    34     const SkSize& getSize() const { return fSize; }

    36     typedef GrGLDistanceFieldTextureEffect GLEffect;

    38     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;

    40 private:

    41     GrDistanceFieldTextureEffect(GrTexture* texture, const GrTextureParams& params,

    42                                  const SkISize& textureSize);

    44     virtual bool onIsEqual(const GrEffect& other) const SK_OVERRIDE;

    46     GrTextureAccess fTextureAccess;

    47     SkSize          fSize;

    49     GR_DECLARE_EFFECT_TEST;

    51     typedef GrVertexEffect INHERITED;

    52 };

    54 #endif

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