gfx/skia/trunk/src/gpu/effects/GrConfigConversionEffect.h@6474c204b198 (annotated)
gfx/skia/trunk/src/gpu/effects/GrConfigConversionEffect.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2012 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef GrConfigConversionEffect_DEFINED |
| michael@0 | 9 | #define GrConfigConversionEffect_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | #include "GrSingleTextureEffect.h" |
| michael@0 | 12 | |
| michael@0 | 13 | class GrEffectStage; |
| michael@0 | 14 | class GrGLConfigConversionEffect; |
| michael@0 | 15 | |
| michael@0 | 16 | /** |
| michael@0 | 17 | * This class is used to perform config conversions. Clients may want to read/write data that is |
| michael@0 | 18 | * unpremultiplied. Also on some systems reading/writing BGRA or RGBA is faster. In those cases we |
| michael@0 | 19 | * read/write using the faster path and perform an R/B swap in the shader if the client data is in |
| michael@0 | 20 | * the slower config. |
| michael@0 | 21 | */ |
| michael@0 | 22 | class GrConfigConversionEffect : public GrSingleTextureEffect { |
| michael@0 | 23 | public: |
| michael@0 | 24 | /** |
| michael@0 | 25 | * The PM->UPM or UPM->PM conversions to apply. |
| michael@0 | 26 | */ |
| michael@0 | 27 | enum PMConversion { |
| michael@0 | 28 | kNone_PMConversion = 0, |
| michael@0 | 29 | kMulByAlpha_RoundUp_PMConversion, |
| michael@0 | 30 | kMulByAlpha_RoundDown_PMConversion, |
| michael@0 | 31 | kDivByAlpha_RoundUp_PMConversion, |
| michael@0 | 32 | kDivByAlpha_RoundDown_PMConversion, |
| michael@0 | 33 | |
| michael@0 | 34 | kPMConversionCnt |
| michael@0 | 35 | }; |
| michael@0 | 36 | |
| michael@0 | 37 | // Installs an effect in the GrEffectStage to perform a config conversion. |
| michael@0 | 38 | static const GrEffectRef* Create(GrTexture*, |
| michael@0 | 39 | bool swapRedAndBlue, |
| michael@0 | 40 | PMConversion pmConversion, |
| michael@0 | 41 | const SkMatrix& matrix); |
| michael@0 | 42 | |
| michael@0 | 43 | static const char* Name() { return "Config Conversion"; } |
| michael@0 | 44 | typedef GrGLConfigConversionEffect GLEffect; |
| michael@0 | 45 | |
| michael@0 | 46 | virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| michael@0 | 47 | |
| michael@0 | 48 | virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| michael@0 | 49 | |
| michael@0 | 50 | bool swapsRedAndBlue() const { return fSwapRedAndBlue; } |
| michael@0 | 51 | PMConversion pmConversion() const { return fPMConversion; } |
| michael@0 | 52 | |
| michael@0 | 53 | // This function determines whether it is possible to choose PM->UPM and UPM->PM conversions |
| michael@0 | 54 | // for which in any PM->UPM->PM->UPM sequence the two UPM values are the same. This means that |
| michael@0 | 55 | // if pixels are read back to a UPM buffer, written back to PM to the GPU, and read back again |
| michael@0 | 56 | // both reads will produce the same result. This test is quite expensive and should not be run |
| michael@0 | 57 | // multiple times for a given context. |
| michael@0 | 58 | static void TestForPreservingPMConversions(GrContext* context, |
| michael@0 | 59 | PMConversion* PMToUPMRule, |
| michael@0 | 60 | PMConversion* UPMToPMRule); |
| michael@0 | 61 | |
| michael@0 | 62 | private: |
| michael@0 | 63 | GrConfigConversionEffect(GrTexture*, |
| michael@0 | 64 | bool swapRedAndBlue, |
| michael@0 | 65 | PMConversion pmConversion, |
| michael@0 | 66 | const SkMatrix& matrix); |
| michael@0 | 67 | |
| michael@0 | 68 | virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; |
| michael@0 | 69 | |
| michael@0 | 70 | bool fSwapRedAndBlue; |
| michael@0 | 71 | PMConversion fPMConversion; |
| michael@0 | 72 | |
| michael@0 | 73 | GR_DECLARE_EFFECT_TEST; |
| michael@0 | 74 | |
| michael@0 | 75 | typedef GrSingleTextureEffect INHERITED; |
| michael@0 | 76 | }; |
| michael@0 | 77 | |
| michael@0 | 78 | #endif |
