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