1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/gpu/GrPathRendererChain.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,79 @@
1.4 +/*
1.5 + * Copyright 2011 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef GrPathRendererChain_DEFINED
1.12 +#define GrPathRendererChain_DEFINED
1.13 +
1.14 +#include "SkRefCnt.h"
1.15 +#include "SkTArray.h"
1.16 +
1.17 +class GrContext;
1.18 +class GrDrawTarget;
1.19 +class GrPathRenderer;
1.20 +class SkPath;
1.21 +class SkStrokeRec;
1.22 +
1.23 +/**
1.24 + * Keeps track of an ordered list of path renderers. When a path needs to be
1.25 + * drawn this list is scanned to find the most preferred renderer. To add your
1.26 + * path renderer to the list implement the GrPathRenderer::AddPathRenderers
1.27 + * function.
1.28 + */
1.29 +class GrPathRendererChain : public SkRefCnt {
1.30 +public:
1.31 + // See comments in GrPathRenderer.h
1.32 + enum StencilSupport {
1.33 + kNoSupport_StencilSupport,
1.34 + kStencilOnly_StencilSupport,
1.35 + kNoRestriction_StencilSupport,
1.36 + };
1.37 +
1.38 + SK_DECLARE_INST_COUNT(GrPathRendererChain)
1.39 +
1.40 + GrPathRendererChain(GrContext* context);
1.41 +
1.42 + ~GrPathRendererChain();
1.43 +
1.44 + // takes a ref and unrefs in destructor
1.45 + GrPathRenderer* addPathRenderer(GrPathRenderer* pr);
1.46 +
1.47 + /** Documents how the caller plans to use a GrPathRenderer to draw a path. It affects the PR
1.48 + returned by getPathRenderer */
1.49 + enum DrawType {
1.50 + kColor_DrawType, // draw to the color buffer, no AA
1.51 + kColorAntiAlias_DrawType, // draw to color buffer, with partial coverage AA
1.52 + kStencilOnly_DrawType, // draw just to the stencil buffer
1.53 + kStencilAndColor_DrawType, // draw the stencil and color buffer, no AA
1.54 + kStencilAndColorAntiAlias_DrawType // draw the stencil and color buffer, with partial
1.55 + // coverage AA.
1.56 + };
1.57 + /** Returns a GrPathRenderer compatible with the request if one is available. If the caller
1.58 + is drawing the path to the stencil buffer then stencilSupport can be used to determine
1.59 + whether the path can be rendered with arbitrary stencil rules or not. See comments on
1.60 + StencilSupport in GrPathRenderer.h. */
1.61 + GrPathRenderer* getPathRenderer(const SkPath& path,
1.62 + const SkStrokeRec& rec,
1.63 + const GrDrawTarget* target,
1.64 + DrawType drawType,
1.65 + StencilSupport* stencilSupport);
1.66 +
1.67 +private:
1.68 + GrPathRendererChain();
1.69 +
1.70 + void init();
1.71 +
1.72 + enum {
1.73 + kPreAllocCount = 8,
1.74 + };
1.75 + bool fInit;
1.76 + GrContext* fOwner;
1.77 + SkSTArray<kPreAllocCount, GrPathRenderer*, true> fChain;
1.78 +
1.79 + typedef SkRefCnt INHERITED;
1.80 +};
1.81 +
1.82 +#endif
