| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrCoverageSetOpXP_DEFINED |
| #define GrCoverageSetOpXP_DEFINED |
| |
| #include "GrTypes.h" |
| #include "GrXferProcessor.h" |
| #include "SkRegion.h" |
| |
| class GrProcOptInfo; |
| |
| /** |
| * This xfer processor directly blends the the src coverage with the dst using a set operator. It is |
| * useful for rendering coverage masks using CSG. It can optionally invert the src coverage before |
| * applying the set operator. |
| */ |
| class GrCoverageSetOpXPFactory : public GrXPFactory { |
| public: |
| static GrXPFactory* Create(SkRegion::Op regionOp, bool invertCoverage = false); |
| |
| bool supportsRGBCoverage(GrColor /*knownColor*/, |
| uint32_t /*knownColorFlags*/) const SK_OVERRIDE { |
| return true; |
| } |
| |
| bool canTweakAlphaForCoverage() const SK_OVERRIDE { return false; } |
| |
| void getInvariantOutput(const GrProcOptInfo& colorPOI, const GrProcOptInfo& coveragePOI, |
| GrXPFactory::InvariantOutput*) const SK_OVERRIDE; |
| |
| private: |
| GrCoverageSetOpXPFactory(SkRegion::Op regionOp, bool invertCoverage); |
| |
| GrXferProcessor* onCreateXferProcessor(const GrDrawTargetCaps& caps, |
| const GrProcOptInfo& colorPOI, |
| const GrProcOptInfo& coveragePOI, |
| const GrDeviceCoordTexture* dstCopy) const SK_OVERRIDE; |
| |
| bool willReadDstColor(const GrDrawTargetCaps& /*caps*/, |
| const GrProcOptInfo& /*colorPOI*/, |
| const GrProcOptInfo& /*coveragePOI*/) const SK_OVERRIDE { |
| return false; |
| } |
| |
| bool onIsEqual(const GrXPFactory& xpfBase) const SK_OVERRIDE { |
| const GrCoverageSetOpXPFactory& xpf = xpfBase.cast<GrCoverageSetOpXPFactory>(); |
| return fRegionOp == xpf.fRegionOp; |
| } |
| |
| GR_DECLARE_XP_FACTORY_TEST; |
| |
| SkRegion::Op fRegionOp; |
| bool fInvertCoverage; |
| |
| typedef GrXPFactory INHERITED; |
| }; |
| #endif |
| |