| /* |
| * 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 GrTessellationPathRenderer_DEFINED |
| #define GrTessellationPathRenderer_DEFINED |
| |
| #include "src/gpu/GrDynamicAtlas.h" |
| #include "src/gpu/GrOnFlushResourceProvider.h" |
| #include "src/gpu/GrPathRenderer.h" |
| #include <map> |
| |
| // This is the tie-in point for path rendering via GrTessellatePathOp. This path renderer draws |
| // paths using a hybrid Red Book "stencil, then cover" method. Curves get linearized by GPU |
| // tessellation shaders. This path renderer doesn't apply analytic AA, so it requires a render |
| // target that supports either MSAA or mixed samples if AA is desired. |
| class GrTessellationPathRenderer : public GrPathRenderer, public GrOnFlushCallbackObject { |
| public: |
| const char* name() const final { return "Tess"; } |
| |
| GrTessellationPathRenderer(const GrCaps&); |
| StencilSupport onGetStencilSupport(const GrStyledShape& shape) const override { |
| // TODO: Single-pass (e.g., convex) paths can have full support. |
| return kStencilOnly_StencilSupport; |
| } |
| CanDrawPath onCanDrawPath(const CanDrawPathArgs&) const override; |
| bool onDrawPath(const DrawPathArgs&) override; |
| void onStencilPath(const StencilPathArgs&) override; |
| void preFlush(GrOnFlushResourceProvider*, const uint32_t* opsTaskIDs, |
| int numOpsTaskIDs) override; |
| |
| private: |
| SkPath* getAtlasUberPath(SkPathFillType fillType, bool antialias) { |
| int idx = (int)antialias << 1; |
| idx |= (int)fillType & 1; |
| return &fAtlasUberPaths[idx]; |
| } |
| // Allocates space in fAtlas if the path is small and simple enough, and if there is room. |
| bool tryAddPathToAtlas(const GrCaps&, const SkMatrix&, const SkPath&, GrAAType, |
| SkIRect* devIBounds, SkIPoint16* locationInAtlas, |
| bool* transposedInAtlas); |
| void renderAtlas(GrOnFlushResourceProvider*); |
| |
| GrDynamicAtlas fAtlas; |
| SkPath fAtlasUberPaths[4]; // 2 fillTypes * 2 antialias modes. |
| }; |
| |
| #endif |