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 "GrPathRenderer.h" 12 13 #include "SkTypes.h" 14 #include "SkTArray.h" 15 16 class GrContext; 17 18 /** 19 * Keeps track of an ordered list of path renderers. When a path needs to be 20 * drawn this list is scanned to find the most preferred renderer. To add your 21 * path renderer to the list implement the GrPathRenderer::AddPathRenderers 22 * function. 23 */ 24 class GrPathRendererChain : public SkNoncopyable { 25 public: 26 GrPathRendererChain(GrContext* context); 27 28 ~GrPathRendererChain(); 29 30 /** Documents how the caller plans to use a GrPathRenderer to draw a path. It affects the PR 31 returned by getPathRenderer */ 32 enum DrawType { 33 kColor_DrawType, // draw to the color buffer, no AA 34 kColorAntiAlias_DrawType, // draw to color buffer, with partial coverage AA 35 kStencilOnly_DrawType, // draw just to the stencil buffer 36 kStencilAndColor_DrawType, // draw the stencil and color buffer, no AA 37 kStencilAndColorAntiAlias_DrawType // draw the stencil and color buffer, with partial 38 // coverage AA. 39 }; 40 41 /** Returns a GrPathRenderer compatible with the request if one is available. If the caller 42 is drawing the path to the stencil buffer then stencilSupport can be used to determine 43 whether the path can be rendered with arbitrary stencil rules or not. See comments on 44 StencilSupport in GrPathRenderer.h. */ 45 GrPathRenderer* getPathRenderer(const GrPathRenderer::CanDrawPathArgs& args, 46 DrawType drawType, 47 GrPathRenderer::StencilSupport* stencilSupport); 48 49 private: 50 // takes a ref and unrefs in destructor 51 GrPathRenderer* addPathRenderer(GrPathRenderer* pr); 52 53 enum { 54 kPreAllocCount = 8, 55 }; 56 SkSTArray<kPreAllocCount, GrPathRenderer*, true> fChain; 57 }; 58 59 #endif 60