The Tor Browser / file comparison
comparison: gfx/skia/trunk/src/gpu/effects/GrConfigConversionEffect.h
gfx/skia/trunk/src/gpu/effects/GrConfigConversionEffect.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:a7ab51fbed55 |
|---|---|
| 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 GrConfigConversionEffect_DEFINED | |
| 9 #define GrConfigConversionEffect_DEFINED | |
| 10 | |
| 11 #include "GrSingleTextureEffect.h" | |
| 12 | |
| 13 class GrEffectStage; | |
| 14 class GrGLConfigConversionEffect; | |
| 15 | |
| 16 /** | |
| 17 * This class is used to perform config conversions. Clients may want to read/write data that is | |
| 18 * unpremultiplied. Also on some systems reading/writing BGRA or RGBA is faster. In those cases we | |
| 19 * read/write using the faster path and perform an R/B swap in the shader if the client data is in | |
| 20 * the slower config. | |
| 21 */ | |
| 22 class GrConfigConversionEffect : public GrSingleTextureEffect { | |
| 23 public: | |
| 24 /** | |
| 25 * The PM->UPM or UPM->PM conversions to apply. | |
| 26 */ | |
| 27 enum PMConversion { | |
| 28 kNone_PMConversion = 0, | |
| 29 kMulByAlpha_RoundUp_PMConversion, | |
| 30 kMulByAlpha_RoundDown_PMConversion, | |
| 31 kDivByAlpha_RoundUp_PMConversion, | |
| 32 kDivByAlpha_RoundDown_PMConversion, | |
| 33 | |
| 34 kPMConversionCnt | |
| 35 }; | |
| 36 | |
| 37 // Installs an effect in the GrEffectStage to perform a config conversion. | |
| 38 static const GrEffectRef* Create(GrTexture*, | |
| 39 bool swapRedAndBlue, | |
| 40 PMConversion pmConversion, | |
| 41 const SkMatrix& matrix); | |
| 42 | |
| 43 static const char* Name() { return "Config Conversion"; } | |
| 44 typedef GrGLConfigConversionEffect GLEffect; | |
| 45 | |
| 46 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; | |
| 47 | |
| 48 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; | |
| 49 | |
| 50 bool swapsRedAndBlue() const { return fSwapRedAndBlue; } | |
| 51 PMConversion pmConversion() const { return fPMConversion; } | |
| 52 | |
| 53 // This function determines whether it is possible to choose PM->UPM and UPM->PM conversions | |
| 54 // for which in any PM->UPM->PM->UPM sequence the two UPM values are the same. This means that | |
| 55 // if pixels are read back to a UPM buffer, written back to PM to the GPU, and read back again | |
| 56 // both reads will produce the same result. This test is quite expensive and should not be run | |
| 57 // multiple times for a given context. | |
| 58 static void TestForPreservingPMConversions(GrContext* context, | |
| 59 PMConversion* PMToUPMRule, | |
| 60 PMConversion* UPMToPMRule); | |
| 61 | |
| 62 private: | |
| 63 GrConfigConversionEffect(GrTexture*, | |
| 64 bool swapRedAndBlue, | |
| 65 PMConversion pmConversion, | |
| 66 const SkMatrix& matrix); | |
| 67 | |
| 68 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; | |
| 69 | |
| 70 bool fSwapRedAndBlue; | |
| 71 PMConversion fPMConversion; | |
| 72 | |
| 73 GR_DECLARE_EFFECT_TEST; | |
| 74 | |
| 75 typedef GrSingleTextureEffect INHERITED; | |
| 76 }; | |
| 77 | |
| 78 #endif |
