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comparison: gfx/skia/trunk/src/gpu/effects/GrSingleTextureEffect.h
gfx/skia/trunk/src/gpu/effects/GrSingleTextureEffect.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:30625faab14e |
|---|---|
| 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 #include "GrCoordTransform.h" | |
| 14 | |
| 15 class GrTexture; | |
| 16 | |
| 17 /** | |
| 18 * A base class for effects that draw a single texture with a texture matrix. This effect has no | |
| 19 * backend implementations. One must be provided by the subclass. | |
| 20 */ | |
| 21 class GrSingleTextureEffect : public GrEffect { | |
| 22 public: | |
| 23 virtual ~GrSingleTextureEffect(); | |
| 24 | |
| 25 protected: | |
| 26 /** unfiltered, clamp mode */ | |
| 27 GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet); | |
| 28 /** clamp mode */ | |
| 29 GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode, | |
| 30 GrCoordSet = kLocal_GrCoordSet); | |
| 31 GrSingleTextureEffect(GrTexture*, | |
| 32 const SkMatrix&, | |
| 33 const GrTextureParams&, | |
| 34 GrCoordSet = kLocal_GrCoordSet); | |
| 35 | |
| 36 /** | |
| 37 * Helper for subclass onIsEqual() functions. | |
| 38 */ | |
| 39 bool hasSameTextureParamsMatrixAndSourceCoords(const GrSingleTextureEffect& other) const { | |
| 40 // We don't have to check the accesses' swizzles because they are inferred from the texture. | |
| 41 return fTextureAccess == other.fTextureAccess && | |
| 42 fCoordTransform.getMatrix().cheapEqualTo(other.fCoordTransform.getMatrix()) && | |
| 43 fCoordTransform.sourceCoords() == other.fCoordTransform.sourceCoords(); | |
| 44 } | |
| 45 | |
| 46 /** | |
| 47 * Can be used as a helper to implement subclass getConstantColorComponents(). It assumes that | |
| 48 * the subclass output color will be a modulation of the input color with a value read from the | |
| 49 * texture. | |
| 50 */ | |
| 51 void updateConstantColorComponentsForModulation(GrColor* color, uint32_t* validFlags) const { | |
| 52 if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) && | |
| 53 GrPixelConfigIsOpaque(this->texture(0)->config())) { | |
| 54 *validFlags = kA_GrColorComponentFlag; | |
| 55 } else { | |
| 56 *validFlags = 0; | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 private: | |
| 61 GrCoordTransform fCoordTransform; | |
| 62 GrTextureAccess fTextureAccess; | |
| 63 | |
| 64 typedef GrEffect INHERITED; | |
| 65 }; | |
| 66 | |
| 67 #endif |
