diff options
Diffstat (limited to 'src/pdf/SkPDFStream.cpp')
-rw-r--r-- | src/pdf/SkPDFStream.cpp | 124 |
1 files changed, 90 insertions, 34 deletions
diff --git a/src/pdf/SkPDFStream.cpp b/src/pdf/SkPDFStream.cpp index b1bd5ff..0bd63f3 100644 --- a/src/pdf/SkPDFStream.cpp +++ b/src/pdf/SkPDFStream.cpp @@ -1,61 +1,117 @@ + /* - * Copyright (C) 2010 Google Inc. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 + * Copyright 2010 Google Inc. * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. + * 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" -SkPDFStream::SkPDFStream(SkStream* stream) { - if (SkFlate::HaveFlate()) - SkAssertResult(SkFlate::Deflate(stream, &fCompressedData)); - - if (SkFlate::HaveFlate() && - fCompressedData.getOffset() < stream->getLength()) { - fLength = fCompressedData.getOffset(); - insert("Filter", new SkPDFName("FlateDecode"))->unref(); - } else { - fCompressedData.reset(); - fPlainData = stream; - fLength = fPlainData->getLength(); - } - insert("Length", new SkPDFInt(fLength))->unref(); +static bool skip_compression(SkPDFCatalog* catalog) { + return catalog->getDocumentFlags() & SkPDFDocument::kNoCompression_Flag; +} + +SkPDFStream::SkPDFStream(SkStream* stream) + : fState(kUnused_State), + fData(stream) { +} + +SkPDFStream::SkPDFStream(SkData* data) : fState(kUnused_State) { + SkMemoryStream* stream = new SkMemoryStream; + stream->setData(data); + fData = stream; + fData->unref(); // SkRefPtr and new both took a reference. } -SkPDFStream::~SkPDFStream() { +SkPDFStream::SkPDFStream(const SkPDFStream& pdfStream) + : SkPDFDict(), + fState(kUnused_State), + fData(pdfStream.fData) { + 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) + 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"); - if (fPlainData.get()) - stream->write(fPlainData->getMemoryBase(), fLength); - else - stream->write(fCompressedData.getStream(), fLength); + stream->write(fData->getMemoryBase(), fData->getLength()); stream->writeText("\nendstream"); } size_t SkPDFStream::getOutputSize(SkPDFCatalog* catalog, bool indirect) { - if (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") + fLength; + strlen(" stream\n\nendstream") + fData->getLength(); +} + +SkPDFStream::SkPDFStream() : fState(kUnused_State) {} + +void SkPDFStream::setData(SkStream* stream) { + fData = 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()); + fData = stream; + fData->unref(); // SkRefPtr and new both took a reference. + 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 = new SkPDFStream(*this); + fSubstitute->unref(); // SkRefPtr and new both took a reference. + catalog->setSubstitute(this, fSubstitute.get()); + } + return false; + } + return true; } |