Modifications to GrPatherRenderer(Chain) interfaces to support clip mask manager.
R=robertphillips@google.com
Review URL: https://codereview.appspot.com/6904069
git-svn-id: http://skia.googlecode.com/svn/trunk@6741 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/GrPathRendererChain.h b/include/gpu/GrPathRendererChain.h
new file mode 100644
index 0000000..8b74ba3
--- /dev/null
+++ b/include/gpu/GrPathRendererChain.h
@@ -0,0 +1,83 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef GrPathRendererChain_DEFINED
+#define GrPathRendererChain_DEFINED
+
+#include "GrRefCnt.h"
+#include "SkTArray.h"
+
+class GrContext;
+class GrDrawTarget;
+class GrPathRenderer;
+class SkPath;
+class SkStroke;
+
+/**
+ * Keeps track of an ordered list of path renderers. When a path needs to be
+ * drawn this list is scanned to find the most preferred renderer. To add your
+ * path renderer to the list implement the GrPathRenderer::AddPathRenderers
+ * function.
+ */
+class GrPathRendererChain : public SkRefCnt {
+public:
+ // See comments in GrPathRenderer.h
+ enum StencilSupport {
+ kNoSupport_StencilSupport,
+ kStencilOnly_StencilSupport,
+ kNoRestriction_StencilSupport,
+ };
+
+ SK_DECLARE_INST_COUNT(GrPathRendererChain)
+
+ GrPathRendererChain(GrContext* context);
+
+ ~GrPathRendererChain();
+
+ // takes a ref and unrefs in destructor
+ GrPathRenderer* addPathRenderer(GrPathRenderer* pr);
+
+ /** Documents how the caller plans to use a GrPathRenderer to draw a path. It affects the PR
+ returned by getPathRenderer */
+ enum DrawType {
+ kColor_DrawType, // draw to the color buffer, no AA
+ kColorAntiAlias_DrawType, // draw to color buffer, with partial coverage AA
+ kStencilOnly_DrawType, // draw just to the stencil buffer
+ kStencilAndColor_DrawType, // draw the stencil and color buffer, no AA
+ kStencilAndColorAntiAlias_DrawType // draw the stencil and color buffer, with partial
+ // coverage AA.
+ };
+ /** Returns a GrPathRenderer compatible with the request if one is available. If the caller
+ is drawing the path to the stencil buffer then stencilSupport can be used to determine
+ whether the path can be rendered with arbitrary stencil rules or not. See comments on
+ StencilSupport in GrPathRenderer.h. */
+ GrPathRenderer* getPathRenderer(const SkPath& path,
+ const SkStroke& stroke,
+ const GrDrawTarget* target,
+ DrawType drawType,
+ StencilSupport* stencilSupport);
+
+private:
+
+ GrPathRendererChain();
+
+ void init();
+
+ enum {
+ kPreAllocCount = 8,
+ };
+ bool fInit;
+ GrContext* fOwner;
+ SkSTArray<kPreAllocCount, GrPathRenderer*, true> fChain;
+
+ typedef SkRefCnt INHERITED;
+};
+
+
+#endif