| |
| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #include "GrStencilAndCoverPathRenderer.h" |
| #include "GrCaps.h" |
| #include "GrContext.h" |
| #include "GrGpu.h" |
| #include "GrPath.h" |
| #include "GrRenderTarget.h" |
| #include "GrResourceProvider.h" |
| #include "GrStrokeInfo.h" |
| |
| /* |
| * For now paths only natively support winding and even odd fill types |
| */ |
| static GrPathRendering::FillType convert_skpath_filltype(SkPath::FillType fill) { |
| switch (fill) { |
| default: |
| SkFAIL("Incomplete Switch\n"); |
| case SkPath::kWinding_FillType: |
| case SkPath::kInverseWinding_FillType: |
| return GrPathRendering::kWinding_FillType; |
| case SkPath::kEvenOdd_FillType: |
| case SkPath::kInverseEvenOdd_FillType: |
| return GrPathRendering::kEvenOdd_FillType; |
| } |
| } |
| |
| GrPathRenderer* GrStencilAndCoverPathRenderer::Create(GrResourceProvider* resourceProvider, |
| const GrCaps& caps) { |
| if (caps.shaderCaps()->pathRenderingSupport()) { |
| return SkNEW_ARGS(GrStencilAndCoverPathRenderer, (resourceProvider)); |
| } else { |
| return NULL; |
| } |
| } |
| |
| GrStencilAndCoverPathRenderer::GrStencilAndCoverPathRenderer(GrResourceProvider* resourceProvider) |
| : fResourceProvider(resourceProvider) { |
| } |
| |
| bool GrStencilAndCoverPathRenderer::onCanDrawPath(const CanDrawPathArgs& args) const { |
| if (args.fStroke->isHairlineStyle()) { |
| return false; |
| } |
| if (!args.fPipelineBuilder->getStencil().isDisabled()) { |
| return false; |
| } |
| if (args.fAntiAlias) { |
| return args.fPipelineBuilder->getRenderTarget()->isStencilBufferMultisampled(); |
| } else { |
| return true; // doesn't do per-path AA, relies on the target having MSAA |
| } |
| } |
| |
| static GrPath* get_gr_path(GrResourceProvider* resourceProvider, const SkPath& skPath, |
| const GrStrokeInfo& stroke) { |
| GrUniqueKey key; |
| bool isVolatile; |
| GrPath::ComputeKey(skPath, stroke, &key, &isVolatile); |
| SkAutoTUnref<GrPath> path( |
| static_cast<GrPath*>(resourceProvider->findAndRefResourceByUniqueKey(key))); |
| if (!path) { |
| path.reset(resourceProvider->createPath(skPath, stroke)); |
| if (!isVolatile) { |
| resourceProvider->assignUniqueKeyToResource(key, path); |
| } |
| } else { |
| SkASSERT(path->isEqualTo(skPath, stroke)); |
| } |
| return path.detach(); |
| } |
| |
| void GrStencilAndCoverPathRenderer::onStencilPath(const StencilPathArgs& args) { |
| SkASSERT(!args.fPath->isInverseFillType()); |
| SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, *args.fViewMatrix)); |
| SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, *args.fPath, *args.fStroke)); |
| args.fTarget->stencilPath(*args.fPipelineBuilder, pp, p, |
| convert_skpath_filltype(args.fPath->getFillType())); |
| } |
| |
| bool GrStencilAndCoverPathRenderer::onDrawPath(const DrawPathArgs& args) { |
| SkASSERT(!args.fStroke->isHairlineStyle()); |
| const SkPath& path = *args.fPath; |
| GrPipelineBuilder* pipelineBuilder = args.fPipelineBuilder; |
| const SkMatrix& viewMatrix = *args.fViewMatrix; |
| |
| SkASSERT(pipelineBuilder->getStencil().isDisabled()); |
| |
| if (args.fAntiAlias) { |
| SkASSERT(pipelineBuilder->getRenderTarget()->isStencilBufferMultisampled()); |
| pipelineBuilder->enableState(GrPipelineBuilder::kHWAntialias_Flag); |
| } |
| |
| SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, path, *args.fStroke)); |
| |
| if (path.isInverseFillType()) { |
| GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass, |
| kKeep_StencilOp, |
| kZero_StencilOp, |
| // We know our rect will hit pixels outside the clip and the user bits will be 0 |
| // outside the clip. So we can't just fill where the user bits are 0. We also need to |
| // check that the clip bit is set. |
| kEqualIfInClip_StencilFunc, |
| 0xffff, |
| 0x0000, |
| 0xffff); |
| |
| pipelineBuilder->setStencil(kInvertedStencilPass); |
| |
| // fake inverse with a stencil and cover |
| SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(GrColor_WHITE, viewMatrix)); |
| args.fTarget->stencilPath(*pipelineBuilder, pp, p, |
| convert_skpath_filltype(path.getFillType())); |
| |
| SkMatrix invert = SkMatrix::I(); |
| SkRect bounds = |
| SkRect::MakeLTRB(0, 0, SkIntToScalar(pipelineBuilder->getRenderTarget()->width()), |
| SkIntToScalar(pipelineBuilder->getRenderTarget()->height())); |
| SkMatrix vmi; |
| // mapRect through persp matrix may not be correct |
| if (!viewMatrix.hasPerspective() && viewMatrix.invert(&vmi)) { |
| vmi.mapRect(&bounds); |
| // theoretically could set bloat = 0, instead leave it because of matrix inversion |
| // precision. |
| SkScalar bloat = viewMatrix.getMaxScale() * SK_ScalarHalf; |
| bounds.outset(bloat, bloat); |
| } else { |
| if (!viewMatrix.invert(&invert)) { |
| return false; |
| } |
| } |
| const SkMatrix& viewM = viewMatrix.hasPerspective() ? SkMatrix::I() : viewMatrix; |
| args.fTarget->drawBWRect(*pipelineBuilder, args.fColor, viewM, bounds, invert); |
| } else { |
| GR_STATIC_CONST_SAME_STENCIL(kStencilPass, |
| kZero_StencilOp, |
| kKeep_StencilOp, |
| kNotEqual_StencilFunc, |
| 0xffff, |
| 0x0000, |
| 0xffff); |
| |
| pipelineBuilder->setStencil(kStencilPass); |
| SkAutoTUnref<GrPathProcessor> pp(GrPathProcessor::Create(args.fColor, viewMatrix)); |
| args.fTarget->drawPath(*pipelineBuilder, pp, p, |
| convert_skpath_filltype(path.getFillType())); |
| } |
| |
| pipelineBuilder->stencil()->setDisabled(); |
| return true; |
| } |