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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"
static bool skip_compression(SkPDFCatalog* catalog) {
return SkToBool(catalog->getDocumentFlags() &
SkPDFDocument::kFavorSpeedOverSize_Flags);
}
SkPDFStream::SkPDFStream(SkStream* stream) : fState(kUnused_State) {
setData(stream);
}
SkPDFStream::SkPDFStream(SkData* data) : fState(kUnused_State) {
setData(data);
}
SkPDFStream::SkPDFStream(const SkPDFStream& pdfStream)
: SkPDFDict(),
fState(kUnused_State) {
setData(pdfStream.fData.get());
bool removeLength = true;
// Don't uncompress an already compressed stream, but we could.
if (pdfStream.fState == kCompressed_State) {
fState = kCompressed_State;
removeLength = false;
}
SkPDFDict::Iter dict(pdfStream);
SkPDFName* key;
SkPDFObject* value;
SkPDFName lengthName("Length");
for (key = dict.next(&value); key != NULL; key = dict.next(&value)) {
if (removeLength && *key == lengthName) {
continue;
}
this->insert(key, value);
}
}
SkPDFStream::~SkPDFStream() {}
void SkPDFStream::emitObject(SkWStream* stream, SkPDFCatalog* catalog,
bool indirect) {
if (indirect) {
return emitIndirectObject(stream, catalog);
}
if (!this->populate(catalog)) {
return fSubstitute->emitObject(stream, catalog, indirect);
}
this->INHERITED::emitObject(stream, catalog, false);
stream->writeText(" stream\n");
stream->writeStream(fData.get(), fData->getLength());
fData->rewind();
stream->writeText("\nendstream");
}
size_t SkPDFStream::getOutputSize(SkPDFCatalog* catalog, bool indirect) {
if (indirect) {
return getIndirectOutputSize(catalog);
}
if (!this->populate(catalog)) {
return fSubstitute->getOutputSize(catalog, indirect);
}
return this->INHERITED::getOutputSize(catalog, false) +
strlen(" stream\n\nendstream") + fData->getLength();
}
SkPDFStream::SkPDFStream() : fState(kUnused_State) {}
void SkPDFStream::setData(SkData* data) {
SkMemoryStream* stream = new SkMemoryStream;
stream->setData(data);
fData.reset(stream); // Transfer ownership.
}
void SkPDFStream::setData(SkStream* stream) {
// Code assumes that the stream starts at the beginning and is rewindable.
if (stream) {
SkASSERT(stream->getPosition() == 0);
SkASSERT(stream->rewind());
}
fData.reset(stream);
SkSafeRef(stream);
}
bool SkPDFStream::populate(SkPDFCatalog* catalog) {
if (fState == kUnused_State) {
if (!skip_compression(catalog) && SkFlate::HaveFlate()) {
SkDynamicMemoryWStream compressedData;
SkAssertResult(SkFlate::Deflate(fData.get(), &compressedData));
if (compressedData.getOffset() < fData->getLength()) {
SkMemoryStream* stream = new SkMemoryStream;
stream->setData(compressedData.copyToData())->unref();
fData.reset(stream); // Transfer ownership.
insertName("Filter", "FlateDecode");
}
fState = kCompressed_State;
} else {
fState = kNoCompression_State;
}
insertInt("Length", fData->getLength());
} 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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