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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkData.h"
#include "SkFlate.h"
#include "SkPDFCatalog.h"
#include "SkPDFStream.h"
#include "SkStream.h"
#include "SkStreamPriv.h"
static bool skip_compression(SkPDFCatalog* catalog) {
return SkToBool(catalog->getDocumentFlags() &
SkPDFDocument::kFavorSpeedOverSize_Flags);
}
SkPDFStream::SkPDFStream(SkStream* stream) : fState(kUnused_State) {
this->setData(stream);
}
SkPDFStream::SkPDFStream(SkData* data) : fState(kUnused_State) {
this->setData(data);
}
SkPDFStream::SkPDFStream(const SkPDFStream& pdfStream)
: SkPDFDict(),
fState(kUnused_State) {
this->setData(pdfStream.fDataStream.get());
bool removeLength = true;
// Don't uncompress an already compressed stream, but we could.
if (pdfStream.fState == kCompressed_State) {
fState = kCompressed_State;
removeLength = false;
}
this->mergeFrom(pdfStream);
if (removeLength) {
this->remove("Length");
}
}
SkPDFStream::~SkPDFStream() {}
void SkPDFStream::emitObject(SkWStream* stream, SkPDFCatalog* catalog) {
SkAutoMutexAcquire lock(fMutex); // multiple threads could be calling emit
if (!this->populate(catalog)) {
return fSubstitute->emitObject(stream, catalog);
}
this->INHERITED::emitObject(stream, catalog);
stream->writeText(" stream\n");
stream->writeStream(fDataStream.get(), fDataStream->getLength());
SkAssertResult(fDataStream->rewind());
stream->writeText("\nendstream");
}
SkPDFStream::SkPDFStream() : fState(kUnused_State) {}
void SkPDFStream::setData(SkData* data) {
// FIXME: Don't swap if the data is the same.
fDataStream.reset(SkNEW_ARGS(SkMemoryStream, (data)));
}
void SkPDFStream::setData(SkStream* stream) {
// Code assumes that the stream starts at the beginning and is rewindable.
if (stream) {
// SkStreamRewindableFromSkStream will try stream->duplicate().
fDataStream.reset(SkStreamRewindableFromSkStream(stream));
SkASSERT(fDataStream.get());
} else {
// Use an empty memory stream.
fDataStream.reset(SkNEW(SkMemoryStream));
}
}
size_t SkPDFStream::dataSize() const {
SkASSERT(fDataStream->hasLength());
return fDataStream->getLength();
}
bool SkPDFStream::populate(SkPDFCatalog* catalog) {
if (fState == kUnused_State) {
if (!skip_compression(catalog) && SkFlate::HaveFlate()) {
SkDynamicMemoryWStream compressedData;
SkAssertResult(
SkFlate::Deflate(fDataStream.get(), &compressedData));
SkAssertResult(fDataStream->rewind());
if (compressedData.getOffset() < this->dataSize()) {
SkAutoTDelete<SkStream> compressed(
compressedData.detachAsStream());
this->setData(compressed.get());
insertName("Filter", "FlateDecode");
}
fState = kCompressed_State;
} else {
fState = kNoCompression_State;
}
insertInt("Length", this->dataSize());
} else if (fState == kNoCompression_State && !skip_compression(catalog) &&
SkFlate::HaveFlate()) {
if (!fSubstitute.get()) {
fSubstitute.reset(new SkPDFStream(*this));
catalog->setSubstitute(this, fSubstitute.get());
}
return false;
}
return true;
}
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