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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 "SkBitmapKey.h"
#include "SkPDFTypes.h"
#include "SkShader.h"
class SkPDFCanon;
class SkPDFDocument;
class SkMatrix;
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:
/** Get the PDF shader for the passed SkShader. If the SkShader is
* invalid in some way, returns nullptr. 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 sk_sp<SkPDFObject> GetPDFShader(SkPDFDocument* doc,
SkScalar dpi,
SkShader* shader,
const SkMatrix& matrix,
const SkIRect& surfaceBBox,
SkScalar rasterScale);
static sk_sp<SkPDFArray> MakeRangeObject();
class State {
public:
SkShader::GradientType fType;
SkShader::GradientInfo fInfo;
std::unique_ptr<SkColor[]> fColors;
std::unique_ptr<SkScalar[]> fStops;
SkMatrix fCanvasTransform;
SkMatrix fShaderTransform;
SkIRect fBBox;
SkBitmapKey fBitmapKey;
SkShader::TileMode fImageTileModes[2];
State(SkShader* shader, const SkMatrix& canvasTransform,
const SkIRect& bbox, SkScalar rasterScale,
SkBitmap* dstImage);
bool operator==(const State& b) const;
State MakeAlphaToLuminosityState() const;
State MakeOpaqueState() const;
bool GradientHasAlpha() const;
State(State&&) = default;
State& operator=(State&&) = default;
private:
State(const State& other);
State& operator=(const State& rhs);
void allocateGradientInfoStorage();
};
};
#endif
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