1 2 /* 3 * Copyright 2010 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #include "SkData.h" 11 #include "SkDeflate.h" 12 #include "SkPDFStream.h" 13 #include "SkStream.h" 14 #include "SkStreamPriv.h" 15 16 SkPDFStream::~SkPDFStream() {} 17 18 void SkPDFStream::emitObject(SkWStream* stream, 19 const SkPDFObjNumMap& objNumMap, 20 const SkPDFSubstituteMap& substitutes) const { 21 SkASSERT(fCompressedData); 22 this->INHERITED::emitObject(stream, objNumMap, substitutes); 23 // duplicate (a cheap operation) preserves const on fCompressedData. 24 SkAutoTDelete<SkStreamRewindable> dup(fCompressedData->duplicate()); 25 SkASSERT(dup); 26 SkASSERT(dup->hasLength()); 27 stream->writeText(" stream\n"); 28 stream->writeStream(dup.get(), dup->getLength()); 29 stream->writeText("\nendstream"); 30 } 31 32 void SkPDFStream::setData(SkStream* stream) { 33 SkASSERT(!fCompressedData); // Only call this function once. 34 SkASSERT(stream); 35 // Code assumes that the stream starts at the beginning. 36 37 SkDynamicMemoryWStream compressedData; 38 SkDeflateWStream deflateWStream(&compressedData); 39 SkStreamCopy(&deflateWStream, stream); 40 deflateWStream.finalize(); 41 size_t length = compressedData.bytesWritten(); 42 43 if (stream->hasLength()) { 44 SkAutoTDelete<SkStreamRewindable> dup(stream->duplicate()); 45 if (dup && dup->hasLength() && 46 dup->getLength() <= length + strlen("/Filter_/FlateDecode_")) { 47 this->insertInt("Length", dup->getLength()); 48 fCompressedData.reset(dup.detach()); 49 return; 50 } 51 } 52 fCompressedData.reset(compressedData.detachAsStream()); 53 this->insertName("Filter", "FlateDecode"); 54 this->insertInt("Length", length); 55 } 56
