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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 "SkPDFGraphicState.h"
#include "SkPDFShader.h"
#include "SkTDArray.h"
#include "SkTHash.h"
class SkBitmap;
class SkPDFFont;
class SkPDFBitmap;
class SkPaint;
* 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 {
~SkPDFCanon() { this->reset(); }
// reset to original setting, unrefs all objects.
void reset();
// Returns exact match if there is one. If not, it returns NULL.
// If there is no exact match, but there is a related font, we
// still return NULL, 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*);
SkPDFBitmap* findBitmap(const SkBitmap&) const;
void addBitmap(SkPDFBitmap*);
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 = NULL) : fPtr(ptr) {}
const SkPDFGraphicState* fPtr;
bool operator==(const WrapGS& rhs) const {
return *fPtr == *rhs.fPtr;
static uint32_t Hash(const WrapGS& w) {
return w.fPtr->hash();
SkTHashSet<WrapGS, WrapGS::Hash> fGraphicStateRecords;
SkTDArray<SkPDFBitmap*> fBitmapRecords;
#endif // SkPDFCanon_DEFINED