| /* |
| * Copyright 2019 Google LLC. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef PathInnerTriangulateOp_DEFINED |
| #define PathInnerTriangulateOp_DEFINED |
| |
| #if !defined(SK_ENABLE_OPTIMIZE_SIZE) |
| |
| #include "src/gpu/ganesh/GrBuffer.h" |
| #include "src/gpu/ganesh/GrGpuBuffer.h" |
| #include "src/gpu/ganesh/geometry/GrInnerFanTriangulator.h" |
| #include "src/gpu/ganesh/ops/FillPathFlags.h" |
| #include "src/gpu/ganesh/ops/GrDrawOp.h" |
| #include "src/gpu/ganesh/tessellate/GrTessellationShader.h" |
| |
| namespace skgpu::ganesh { |
| |
| class PathCurveTessellator; |
| |
| // This op is a 3-pass twist on the standard Redbook "stencil then cover" algorithm: |
| // |
| // 1) Tessellate the path's outer curves into the stencil buffer. |
| // 2) Triangulate the path's inner fan and fill it with a stencil test against the curves. |
| // 3) Draw convex hulls around each curve that fill in remaining samples. |
| // |
| // In practice, a path's inner fan takes up a large majority of its pixels. So from a GPU load |
| // perspective, this op is effectively as fast as a single-pass algorithm. |
| class PathInnerTriangulateOp final : public GrDrawOp { |
| private: |
| DEFINE_OP_CLASS_ID |
| |
| PathInnerTriangulateOp(const SkMatrix& viewMatrix, |
| const SkPath& path, |
| GrPaint&& paint, |
| GrAAType aaType, |
| FillPathFlags pathFlags, |
| const SkRect& drawBounds) |
| : GrDrawOp(ClassID()) |
| , fPathFlags(pathFlags) |
| , fViewMatrix(viewMatrix) |
| , fPath(path) |
| , fAAType(aaType) |
| , fColor(paint.getColor4f()) |
| , fProcessors(std::move(paint)) { |
| SkASSERT(!fPath.isInverseFillType()); |
| this->setBounds(drawBounds, HasAABloat::kNo, IsHairline::kNo); |
| } |
| |
| const char* name() const override { return "PathInnerTriangulateOp"; } |
| void visitProxies(const GrVisitProxyFunc&) const override; |
| FixedFunctionFlags fixedFunctionFlags() const override; |
| GrProcessorSet::Analysis finalize(const GrCaps&, const GrAppliedClip*, GrClampType) override; |
| |
| // These calls set up the stencil & fill programs we will use prior to preparing and executing. |
| void pushFanStencilProgram(const GrTessellationShader::ProgramArgs&, |
| const GrPipeline* pipelineForStencils, const GrUserStencilSettings*); |
| void pushFanFillProgram(const GrTessellationShader::ProgramArgs&, const GrUserStencilSettings*); |
| void prePreparePrograms(const GrTessellationShader::ProgramArgs&, GrAppliedClip&&); |
| |
| void onPrePrepare(GrRecordingContext*, const GrSurfaceProxyView&, GrAppliedClip*, |
| const GrDstProxyView&, GrXferBarrierFlags, GrLoadOp colorLoadOp) override; |
| void onPrepare(GrOpFlushState*) override; |
| void onExecute(GrOpFlushState*, const SkRect& chainBounds) override; |
| |
| const FillPathFlags fPathFlags; |
| const SkMatrix fViewMatrix; |
| const SkPath fPath; |
| const GrAAType fAAType; |
| SkPMColor4f fColor; |
| GrProcessorSet fProcessors; |
| |
| // Triangulates the inner fan. |
| GrInnerFanTriangulator* fFanTriangulator = nullptr; |
| GrTriangulator::Poly* fFanPolys = nullptr; |
| GrInnerFanTriangulator::BreadcrumbTriangleList fFanBreadcrumbs; |
| |
| // This pipeline is shared by all programs that do filling. |
| const GrPipeline* fPipelineForFills = nullptr; |
| |
| // Tessellates the outer curves. |
| PathCurveTessellator* fTessellator = nullptr; |
| |
| // Pass 1: Tessellate the outer curves into the stencil buffer. |
| const GrProgramInfo* fStencilCurvesProgram = nullptr; |
| |
| // Pass 2: Fill the path's inner fan with a stencil test against the curves. (In extenuating |
| // circumstances this might require two separate draws.) |
| skia_private::STArray<2, const GrProgramInfo*> fFanPrograms; |
| |
| // Pass 3: Draw convex hulls around each curve. |
| const GrProgramInfo* fCoverHullsProgram = nullptr; |
| |
| // This buffer gets created by fFanTriangulator during onPrepare. |
| sk_sp<const GrBuffer> fFanBuffer; |
| int fBaseFanVertex = 0; |
| int fFanVertexCount = 0; |
| |
| // Only used if sk_VertexID is not supported. |
| sk_sp<const GrGpuBuffer> fHullVertexBufferIfNoIDSupport; |
| |
| friend class GrOp; // For ctor. |
| }; |
| |
| } // namespace skgpu::ganesh |
| |
| #endif // SK_ENABLE_OPTIMIZE_SIZE |
| |
| #endif // PathInnerTriangulateOp_DEFINED |