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      1 /*
      2  * Copyright (C) 2010 Google Inc.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "SkFlate.h"
     18 #include "SkPDFCatalog.h"
     19 #include "SkPDFStream.h"
     20 #include "SkStream.h"
     21 
     22 SkPDFStream::SkPDFStream(SkStream* stream) {
     23     if (SkFlate::HaveFlate())
     24         SkAssertResult(SkFlate::Deflate(stream, &fCompressedData));
     25 
     26     if (SkFlate::HaveFlate() &&
     27             fCompressedData.getOffset() < stream->getLength()) {
     28         fLength = fCompressedData.getOffset();
     29         insert("Filter", new SkPDFName("FlateDecode"))->unref();
     30     } else {
     31         fCompressedData.reset();
     32         fPlainData = stream;
     33         fLength = fPlainData->getLength();
     34     }
     35     insert("Length", new SkPDFInt(fLength))->unref();
     36 }
     37 
     38 SkPDFStream::~SkPDFStream() {
     39 }
     40 
     41 void SkPDFStream::emitObject(SkWStream* stream, SkPDFCatalog* catalog,
     42                              bool indirect) {
     43     if (indirect)
     44         return emitIndirectObject(stream, catalog);
     45 
     46     this->INHERITED::emitObject(stream, catalog, false);
     47     stream->writeText(" stream\n");
     48     if (fPlainData.get())
     49         stream->write(fPlainData->getMemoryBase(), fLength);
     50     else
     51         stream->write(fCompressedData.getStream(), fLength);
     52     stream->writeText("\nendstream");
     53 }
     54 
     55 size_t SkPDFStream::getOutputSize(SkPDFCatalog* catalog, bool indirect) {
     56     if (indirect)
     57         return getIndirectOutputSize(catalog);
     58 
     59     return this->INHERITED::getOutputSize(catalog, false) +
     60         strlen(" stream\n\nendstream") + fLength;
     61 }
     62