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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPDFCanon_DEFINED
#define SkPDFCanon_DEFINED
#include "SkBitmap.h"
#include "SkPDFGraphicState.h"
#include "SkPDFShader.h"
#include "SkTDArray.h"
#include "SkTHash.h"
class SkPDFFont;
class SkPaint;
class SkImage;
class SkBitmapKey {
public:
SkBitmapKey() : fSubset(SkIRect::MakeEmpty()), fGenID(0) {}
explicit SkBitmapKey(const SkBitmap& bm)
: fSubset(bm.getSubset()), fGenID(bm.getGenerationID()) {}
bool operator==(const SkBitmapKey& rhs) const {
return fGenID == rhs.fGenID && fSubset == rhs.fSubset;
}
private:
SkIRect fSubset;
uint32_t fGenID;
};
/**
* The SkPDFCanon canonicalizes objects across PDF pages(SkPDFDevices).
*
* The PDF backend works correctly if:
* - There is no more than one SkPDFCanon for each thread.
* - Every SkPDFDevice is given a pointer to a SkPDFCanon on creation.
* - All SkPDFDevices in a document share the same SkPDFCanon.
* The SkDocument_PDF class makes this happen by owning a single
* SkPDFCanon.
*
* The addFoo() methods will ref the Foo; the canon's destructor will
* call foo->unref() on all of these objects.
*
* The findFoo() methods do not change the ref count of the Foo
* objects.
*/
class SkPDFCanon : SkNoncopyable {
public:
~SkPDFCanon() { this->reset(); }
// reset to original setting, unrefs all objects.
void reset();
// Returns exact match if there is one. If not, it returns nullptr.
// If there is no exact match, but there is a related font, we
// still return nullptr, but also set *relatedFont.
SkPDFFont* findFont(uint32_t fontID,
uint16_t glyphID,
SkPDFFont** relatedFont) const;
void addFont(SkPDFFont* font, uint32_t fontID, uint16_t fGlyphID);
SkPDFFunctionShader* findFunctionShader(const SkPDFShader::State&) const;
void addFunctionShader(SkPDFFunctionShader*);
SkPDFAlphaFunctionShader* findAlphaShader(const SkPDFShader::State&) const;
void addAlphaShader(SkPDFAlphaFunctionShader*);
SkPDFImageShader* findImageShader(const SkPDFShader::State&) const;
void addImageShader(SkPDFImageShader*);
const SkPDFGraphicState* findGraphicState(const SkPDFGraphicState&) const;
void addGraphicState(const SkPDFGraphicState*);
SkPDFObject* findPDFBitmap(const SkImage* image) const;
void addPDFBitmap(uint32_t imageUniqueID, SkPDFObject*);
const SkImage* bitmapToImage(const SkBitmap&);
SkTHashMap<uint32_t, bool> fCanEmbedTypeface;
private:
struct FontRec {
SkPDFFont* fFont;
uint32_t fFontID;
uint16_t fGlyphID;
};
SkTDArray<FontRec> fFontRecords;
SkTDArray<SkPDFFunctionShader*> fFunctionShaderRecords;
SkTDArray<SkPDFAlphaFunctionShader*> fAlphaShaderRecords;
SkTDArray<SkPDFImageShader*> fImageShaderRecords;
struct WrapGS {
explicit WrapGS(const SkPDFGraphicState* ptr = nullptr) : fPtr(ptr) {}
const SkPDFGraphicState* fPtr;
bool operator==(const WrapGS& rhs) const {
SkASSERT(fPtr);
SkASSERT(rhs.fPtr);
return *fPtr == *rhs.fPtr;
}
static uint32_t Hash(const WrapGS& w) {
SkASSERT(w.fPtr);
return w.fPtr->hash();
}
};
SkTHashSet<WrapGS, WrapGS::Hash> fGraphicStateRecords;
SkTHashMap<SkBitmapKey, const SkImage*> fBitmapToImageMap;
SkTHashMap<uint32_t /*ImageUniqueID*/, SkPDFObject*> fPDFBitmapMap;
};
#endif // SkPDFCanon_DEFINED
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