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66 lines
1.9 KiB
C
66 lines
1.9 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 SkPDFShader_DEFINED
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#define SkPDFShader_DEFINED
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#include "SkPDFStream.h"
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#include "SkPDFTypes.h"
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#include "SkMatrix.h"
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#include "SkRefCnt.h"
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#include "SkShader.h"
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class SkObjRef;
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class SkPDFCatalog;
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/** \class SkPDFShader
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In PDF parlance, this is a pattern, used in place of a color when the
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pattern color space is selected.
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*/
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class SkPDFShader {
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public:
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/** Get the PDF shader for the passed SkShader. If the SkShader is
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* invalid in some way, returns NULL. The reference count of
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* the object is incremented and it is the caller's responsibility to
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* unreference it when done. This is needed to accommodate the weak
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* reference pattern used when the returned object is new and has no
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* other references.
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* @param shader The SkShader to emulate.
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* @param matrix The current transform. (PDF shaders are absolutely
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* positioned, relative to where the page is drawn.)
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* @param surfceBBox The bounding box of the drawing surface (with matrix
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* already applied).
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*/
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static SkPDFObject* GetPDFShader(const SkShader& shader,
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const SkMatrix& matrix,
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const SkIRect& surfaceBBox);
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protected:
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class State;
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class ShaderCanonicalEntry {
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public:
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ShaderCanonicalEntry(SkPDFObject* pdfShader, const State* state);
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bool operator==(const ShaderCanonicalEntry& b) const;
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SkPDFObject* fPDFShader;
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const State* fState;
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};
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// This should be made a hash table if performance is a problem.
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static SkTDArray<ShaderCanonicalEntry>& CanonicalShaders();
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static SkMutex& CanonicalShadersMutex();
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static void RemoveShader(SkPDFObject* shader);
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SkPDFShader();
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};
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#endif
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