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/*
* 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 SkPDFShader_DEFINED
#define SkPDFShader_DEFINED
#include "SkPDFResourceDict.h"
#include "SkPDFStream.h"
#include "SkPDFTypes.h"
class SkPDFCanon;
class SkMatrix;
class SkShader;
struct SkIRect;
/** \class SkPDFShader
In PDF parlance, this is a pattern, used in place of a color when the
pattern color space is selected.
*/
class SkPDFShader {
public:
class State;
/** Get the PDF shader for the passed SkShader. If the SkShader is
* invalid in some way, returns NULL. The reference count of
* the object is incremented and it is the caller's responsibility to
* unreference it when done. This is needed to accommodate the weak
* reference pattern used when the returned object is new and has no
* other references.
* @param shader The SkShader to emulate.
* @param matrix The current transform. (PDF shaders are absolutely
* positioned, relative to where the page is drawn.)
* @param surfceBBox The bounding box of the drawing surface (with matrix
* already applied).
* @param rasterScale Additional scale to be applied for early
* rasterization.
*/
static SkPDFObject* GetPDFShader(SkPDFCanon* canon,
SkScalar dpi,
const SkShader& shader,
const SkMatrix& matrix,
const SkIRect& surfaceBBox,
SkScalar rasterScale);
};
class SkPDFFunctionShader : public SkPDFDict {
SK_DECLARE_INST_COUNT(SkPDFFunctionShader);
public:
static SkPDFFunctionShader* Create(SkPDFCanon*,
SkAutoTDelete<SkPDFShader::State>*);
virtual ~SkPDFFunctionShader();
bool equals(const SkPDFShader::State&) const;
private:
SkAutoTDelete<const SkPDFShader::State> fShaderState;
SkTDArray<SkPDFObject*> fResources;
SkPDFFunctionShader(SkPDFShader::State*);
typedef SkPDFDict INHERITED;
};
/**
* A shader for PDF gradients. This encapsulates the function shader
* inside a tiling pattern while providing a common pattern interface.
* The encapsulation allows the use of a SMask for transparency gradients.
*/
class SkPDFAlphaFunctionShader : public SkPDFStream {
public:
static SkPDFAlphaFunctionShader* Create(SkPDFCanon*,
SkScalar dpi,
SkAutoTDelete<SkPDFShader::State>*);
virtual ~SkPDFAlphaFunctionShader();
bool equals(const SkPDFShader::State&) const;
private:
SkAutoTDelete<const SkPDFShader::State> fShaderState;
SkAutoTUnref<SkPDFObject> fColorShader;
SkAutoTUnref<SkPDFResourceDict> fResourceDict;
SkPDFAlphaFunctionShader(SkPDFShader::State*);
};
class SkPDFImageShader : public SkPDFStream {
public:
static SkPDFImageShader* Create(SkPDFCanon*,
SkScalar dpi,
SkAutoTDelete<SkPDFShader::State>*);
virtual ~SkPDFImageShader();
bool equals(const SkPDFShader::State&) const;
private:
SkAutoTDelete<const SkPDFShader::State> fShaderState;
SkTSet<SkPDFObject*> fResources;
SkPDFImageShader(SkPDFShader::State*);
};
#endif
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