1 | /* |
2 | * Copyright 2011 Google Inc. |
3 | * |
4 | * Use of this source code is governed by a BSD-style license that can be |
5 | * found in the LICENSE file. |
6 | */ |
7 | |
8 | #ifndef GrPathRendererChain_DEFINED |
9 | #define GrPathRendererChain_DEFINED |
10 | |
11 | #include "src/gpu/GrPathRenderer.h" |
12 | |
13 | #include "include/core/SkTypes.h" |
14 | #include "include/private/GrTypesPriv.h" |
15 | #include "include/private/SkNoncopyable.h" |
16 | #include "include/private/SkTArray.h" |
17 | |
18 | class GrCoverageCountingPathRenderer; |
19 | |
20 | /** |
21 | * Keeps track of an ordered list of path renderers. When a path needs to be |
22 | * drawn this list is scanned to find the most preferred renderer. To add your |
23 | * path renderer to the list implement the GrPathRenderer::AddPathRenderers |
24 | * function. |
25 | */ |
26 | class GrPathRendererChain : public SkNoncopyable { |
27 | public: |
28 | struct Options { |
29 | bool fAllowPathMaskCaching = false; |
30 | GpuPathRenderers fGpuPathRenderers = GpuPathRenderers::kDefault; |
31 | }; |
32 | GrPathRendererChain(GrRecordingContext* context, const Options&); |
33 | |
34 | /** Documents how the caller plans to use a GrPathRenderer to draw a path. It affects the PR |
35 | returned by getPathRenderer */ |
36 | enum class DrawType { |
37 | kColor, // draw to the color buffer, no AA |
38 | kStencil, // draw just to the stencil buffer |
39 | kStencilAndColor, // draw the stencil and color buffer, no AA |
40 | }; |
41 | |
42 | /** Returns a GrPathRenderer compatible with the request if one is available. If the caller |
43 | is drawing the path to the stencil buffer then stencilSupport can be used to determine |
44 | whether the path can be rendered with arbitrary stencil rules or not. See comments on |
45 | StencilSupport in GrPathRenderer.h. */ |
46 | GrPathRenderer* getPathRenderer(const GrPathRenderer::CanDrawPathArgs& args, |
47 | DrawType drawType, |
48 | GrPathRenderer::StencilSupport* stencilSupport); |
49 | |
50 | /** Returns a direct pointer to the coverage counting path renderer, or null if it is not in the |
51 | chain. */ |
52 | GrCoverageCountingPathRenderer* getCoverageCountingPathRenderer() { |
53 | return fCoverageCountingPathRenderer; |
54 | } |
55 | |
56 | private: |
57 | enum { |
58 | kPreAllocCount = 8, |
59 | }; |
60 | SkSTArray<kPreAllocCount, sk_sp<GrPathRenderer>> fChain; |
61 | GrCoverageCountingPathRenderer* fCoverageCountingPathRenderer = nullptr; |
62 | }; |
63 | |
64 | #endif |
65 | |