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1 /* | |
2 * Copyright 2010 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 | |
9 #include "SkData.h" | |
10 #include "SkDeflate.h" | |
11 #include "SkPDFStream.h" | |
12 #include "SkStreamPriv.h" | |
13 | |
14 SkPDFStream::~SkPDFStream() {} | |
15 | |
16 void SkPDFStream::drop() { | |
17 fCompressedData.reset(nullptr); | |
18 this->SkPDFDict::drop(); | |
19 } | |
20 | |
21 void SkPDFStream::emitObject(SkWStream* stream, | |
22 const SkPDFObjNumMap& objNumMap, | |
23 const SkPDFSubstituteMap& substitutes) const { | |
24 SkASSERT(fCompressedData); | |
25 this->INHERITED::emitObject(stream, objNumMap, substitutes); | |
26 // duplicate (a cheap operation) preserves const on fCompressedData. | |
27 std::unique_ptr<SkStreamAsset> dup(fCompressedData->duplicate()); | |
28 SkASSERT(dup); | |
29 SkASSERT(dup->hasLength()); | |
30 stream->writeText(" stream\n"); | |
31 stream->writeStream(dup.get(), dup->getLength()); | |
32 stream->writeText("\nendstream"); | |
33 } | |
34 | |
35 void SkPDFStream::setData(std::unique_ptr<SkStreamAsset> stream) { | |
36 SkASSERT(!fCompressedData); // Only call this function once. | |
37 SkASSERT(stream); | |
38 // Code assumes that the stream starts at the beginning. | |
39 | |
40 #ifdef SK_PDF_LESS_COMPRESSION | |
41 fCompressedData = std::move(stream); | |
42 SkASSERT(fCompressedData && fCompressedData->hasLength()); | |
43 this->insertInt("Length", fCompressedData->getLength()); | |
44 #else | |
45 | |
46 SkASSERT(stream->hasLength()); | |
47 SkDynamicMemoryWStream compressedData; | |
48 SkDeflateWStream deflateWStream(&compressedData); | |
49 SkStreamCopy(&deflateWStream, stream.get()); | |
50 deflateWStream.finalize(); | |
51 size_t compressedLength = compressedData.bytesWritten(); | |
52 size_t originalLength = stream->getLength(); | |
53 | |
54 if (originalLength <= compressedLength + strlen("/Filter_/FlateDecode_")) { | |
55 SkAssertResult(stream->rewind()); | |
56 fCompressedData = std::move(stream); | |
57 this->insertInt("Length", originalLength); | |
58 return; | |
59 } | |
60 fCompressedData.reset(compressedData.detachAsStream()); | |
61 this->insertName("Filter", "FlateDecode"); | |
62 this->insertInt("Length", compressedLength); | |
63 #endif | |
64 } | |
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