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
~SkPDFStream()16 SkPDFStream::~SkPDFStream() {}
17
emitObject(SkWStream * stream,const SkPDFObjNumMap & objNumMap,const SkPDFSubstituteMap & substitutes) const18 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
setData(SkStream * stream)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