GrSingleTextureEffect.h revision b9086a026844e4cfd08b219e49ce3f12294cba98 
1/*
2 * Copyright 2012 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 */
7
8#ifndef GrSingleTextureEffect_DEFINED
9#define GrSingleTextureEffect_DEFINED
10
11#include "GrEffect.h"
12#include "SkMatrix.h"
13
14class GrGLSingleTextureEffect;
15
16/**
17 * An effect that merely blits a single texture; commonly used as a base class.
18 */
19class GrSingleTextureEffect : public GrEffect {
20
21public:
22    /** These three constructors assume an identity matrix */
23    GrSingleTextureEffect(GrTexture* texture); /* unfiltered, clamp mode */
24    GrSingleTextureEffect(GrTexture* texture, bool bilerp); /* clamp mode */
25    GrSingleTextureEffect(GrTexture* texture, const GrTextureParams&);
26
27    /** These three constructors take an explicit matrix */
28    GrSingleTextureEffect(GrTexture*, const SkMatrix&); /* unfiltered, clamp mode */
29    GrSingleTextureEffect(GrTexture*, const SkMatrix&, bool bilerp); /* clamp mode */
30    GrSingleTextureEffect(GrTexture*, const SkMatrix&, const GrTextureParams&);
31
32    virtual ~GrSingleTextureEffect();
33
34    virtual const GrTextureAccess& textureAccess(int index) const SK_OVERRIDE;
35
36    static const char* Name() { return "Single Texture"; }
37
38    const SkMatrix& getMatrix() const { return fMatrix; }
39
40    typedef GrGLSingleTextureEffect GLEffect;
41
42    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
43
44    virtual bool isEqual(const GrEffect& effect) const SK_OVERRIDE {
45        const GrSingleTextureEffect& ste = static_cast<const GrSingleTextureEffect&>(effect);
46        return INHERITED::isEqual(effect) && fMatrix.cheapEqualTo(ste.getMatrix());
47    }
48private:
49    GR_DECLARE_EFFECT_TEST;
50
51    GrTextureAccess fTextureAccess;
52    SkMatrix        fMatrix;
53
54    typedef GrEffect INHERITED;
55};
56
57#endif
58