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| 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 "SkRefCnt.h" | |
| 12 #include "SkTArray.h" | |
| 13 | |
| 14 class GrContext; | |
| 15 class GrPathRenderer; | |
| 16 class GrPipelineBuilder; | |
| 17 class GrShaderCaps; | |
| 18 class GrStrokeInfo; | |
| 19 class SkMatrix; | |
| 20 class SkPath; | |
| 21 | |
| 22 /** | |
| 23 * Keeps track of an ordered list of path renderers. When a path needs to be | |
| 24 * drawn this list is scanned to find the most preferred renderer. To add your | |
| 25 * path renderer to the list implement the GrPathRenderer::AddPathRenderers | |
| 26 * function. | |
| 27 */ | |
| 28 class GrPathRendererChain : public SkRefCnt { | |
| 29 public: | |
| 30 // See comments in GrPathRenderer.h | |
| 31 enum StencilSupport { | |
| 32 kNoSupport_StencilSupport, | |
| 33 kStencilOnly_StencilSupport, | |
| 34 kNoRestriction_StencilSupport, | |
| 35 }; | |
| 36 | |
| 37 GrPathRendererChain(GrContext* context); | |
| 38 | |
| 39 ~GrPathRendererChain(); | |
| 40 | |
| 41 // takes a ref and unrefs in destructor | |
| 42 GrPathRenderer* addPathRenderer(GrPathRenderer* pr); | |
| 43 | |
| 44 /** Documents how the caller plans to use a GrPathRenderer to draw a path. I
t affects the PR | |
| 45 returned by getPathRenderer */ | |
| 46 enum DrawType { | |
| 47 kColor_DrawType, // draw to the color buffer, no AA | |
| 48 kColorAntiAlias_DrawType, // draw to color buffer, with partia
l coverage AA | |
| 49 kStencilOnly_DrawType, // draw just to the stencil buffer | |
| 50 kStencilAndColor_DrawType, // draw the stencil and color buffer
, no AA | |
| 51 kStencilAndColorAntiAlias_DrawType // draw the stencil and color buffer
, with partial | |
| 52 // coverage AA. | |
| 53 }; | |
| 54 /** Returns a GrPathRenderer compatible with the request if one is available
. If the caller | |
| 55 is drawing the path to the stencil buffer then stencilSupport can be use
d to determine | |
| 56 whether the path can be rendered with arbitrary stencil rules or not. Se
e comments on | |
| 57 StencilSupport in GrPathRenderer.h. */ | |
| 58 GrPathRenderer* getPathRenderer(const GrShaderCaps* shaderCaps, | |
| 59 const GrPipelineBuilder&, | |
| 60 const SkMatrix& viewMatrix, | |
| 61 const SkPath& path, | |
| 62 const GrStrokeInfo& stroke, | |
| 63 DrawType drawType, | |
| 64 StencilSupport* stencilSupport); | |
| 65 | |
| 66 private: | |
| 67 GrPathRendererChain(); | |
| 68 | |
| 69 void init(); | |
| 70 | |
| 71 enum { | |
| 72 kPreAllocCount = 8, | |
| 73 }; | |
| 74 bool fInit; | |
| 75 GrContext* fOwner; | |
| 76 SkSTArray<kPreAllocCount, GrPathRenderer*, true> fChain; | |
| 77 | |
| 78 typedef SkRefCnt INHERITED; | |
| 79 }; | |
| 80 | |
| 81 #endif | |
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