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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 "SkDeflate.h"
#include "SkPDFStream.h"
#include "SkStream.h"
#include "SkStreamPriv.h"
SkPDFStream::SkPDFStream(SkStream* stream) : fState(kUnused_State) {
this->setData(stream);
}
SkPDFStream::SkPDFStream(SkData* data) : fState(kUnused_State) {
this->setData(data);
}
SkPDFStream::~SkPDFStream() {}
void SkPDFStream::emitObject(SkWStream* stream,
const SkPDFObjNumMap& objNumMap,
const SkPDFSubstituteMap& substitutes) {
if (fState == kUnused_State) {
fState = kNoCompression_State;
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());
this->insertName("Filter", "FlateDecode");
}
fState = kCompressed_State;
this->insertInt("Length", this->dataSize());
}
this->INHERITED::emitObject(stream, objNumMap, substitutes);
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) {
SkASSERT(stream);
// Code assumes that the stream starts at the beginning and is rewindable.
// SkStreamRewindableFromSkStream will try stream->duplicate().
fDataStream.reset(SkStreamRewindableFromSkStream(stream));
SkASSERT(fDataStream.get());
}
size_t SkPDFStream::dataSize() const {
SkASSERT(fDataStream->hasLength());
return fDataStream->getLength();
}
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