michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrPathRendererChain_DEFINED
michael@0: #define GrPathRendererChain_DEFINED
michael@0: 
michael@0: #include "SkRefCnt.h"
michael@0: #include "SkTArray.h"
michael@0: 
michael@0: class GrContext;
michael@0: class GrDrawTarget;
michael@0: class GrPathRenderer;
michael@0: class SkPath;
michael@0: class SkStrokeRec;
michael@0: 
michael@0: /**
michael@0:  * Keeps track of an ordered list of path renderers. When a path needs to be
michael@0:  * drawn this list is scanned to find the most preferred renderer. To add your
michael@0:  * path renderer to the list implement the GrPathRenderer::AddPathRenderers
michael@0:  * function.
michael@0:  */
michael@0: class GrPathRendererChain : public SkRefCnt {
michael@0: public:
michael@0:     // See comments in GrPathRenderer.h
michael@0:     enum StencilSupport {
michael@0:         kNoSupport_StencilSupport,
michael@0:         kStencilOnly_StencilSupport,
michael@0:         kNoRestriction_StencilSupport,
michael@0:     };
michael@0: 
michael@0:     SK_DECLARE_INST_COUNT(GrPathRendererChain)
michael@0: 
michael@0:     GrPathRendererChain(GrContext* context);
michael@0: 
michael@0:     ~GrPathRendererChain();
michael@0: 
michael@0:     // takes a ref and unrefs in destructor
michael@0:     GrPathRenderer* addPathRenderer(GrPathRenderer* pr);
michael@0: 
michael@0:     /** Documents how the caller plans to use a GrPathRenderer to draw a path. It affects the PR
michael@0:         returned by getPathRenderer */
michael@0:     enum DrawType {
michael@0:         kColor_DrawType,                    // draw to the color buffer, no AA
michael@0:         kColorAntiAlias_DrawType,           // draw to color buffer, with partial coverage AA
michael@0:         kStencilOnly_DrawType,              // draw just to the stencil buffer
michael@0:         kStencilAndColor_DrawType,          // draw the stencil and color buffer, no AA
michael@0:         kStencilAndColorAntiAlias_DrawType  // draw the stencil and color buffer, with partial
michael@0:                                             // coverage AA.
michael@0:     };
michael@0:     /** Returns a GrPathRenderer compatible with the request if one is available. If the caller
michael@0:         is drawing the path to the stencil buffer then stencilSupport can be used to determine
michael@0:         whether the path can be rendered with arbitrary stencil rules or not. See comments on
michael@0:         StencilSupport in GrPathRenderer.h. */
michael@0:     GrPathRenderer* getPathRenderer(const SkPath& path,
michael@0:                                     const SkStrokeRec& rec,
michael@0:                                     const GrDrawTarget* target,
michael@0:                                     DrawType drawType,
michael@0:                                     StencilSupport* stencilSupport);
michael@0: 
michael@0: private:
michael@0:     GrPathRendererChain();
michael@0: 
michael@0:     void init();
michael@0: 
michael@0:     enum {
michael@0:         kPreAllocCount = 8,
michael@0:     };
michael@0:     bool fInit;
michael@0:     GrContext*                                          fOwner;
michael@0:     SkSTArray<kPreAllocCount, GrPathRenderer*, true>    fChain;
michael@0: 
michael@0:     typedef SkRefCnt INHERITED;
michael@0: };
michael@0: 
michael@0: #endif