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| 1 /* | |
| 2 * Copyright 2013 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 "SkFlate.h" | |
| 11 #include "SkPDFCatalog.h" | |
| 12 #include "SkPDFImageStream.h" | |
| 13 #include "SkStream.h" | |
| 14 | |
| 15 #define kNoColorTransform 0 | |
| 16 | |
| 17 static bool skip_compression(SkPDFCatalog* catalog) { | |
| 18 return SkToBool(catalog->getDocumentFlags() & | |
| 19 SkPDFDocument::kFavorSpeedOverSize_Flags); | |
| 20 } | |
| 21 | |
| 22 // TODO(edisonn): Use SkData (after removing deprecated constructor in SkPDFStre
am). | |
| 23 SkPDFImageStream::SkPDFImageStream(SkStream* stream, | |
| 24 const SkBitmap& bitmap, | |
| 25 const SkIRect& srcRect, | |
| 26 EncodeToDCTStream encoder) | |
| 27 : SkPDFStream(stream), | |
| 28 fBitmap(bitmap), | |
| 29 fSrcRect(srcRect), | |
| 30 fEncoder(encoder) { | |
| 31 } | |
| 32 | |
| 33 SkPDFImageStream::SkPDFImageStream(const SkPDFImageStream& pdfStream) | |
| 34 : SkPDFStream(pdfStream), | |
| 35 fBitmap(pdfStream.fBitmap), | |
| 36 fSrcRect(pdfStream.fSrcRect), | |
| 37 fEncoder(pdfStream.fEncoder) { | |
| 38 } | |
| 39 | |
| 40 SkPDFImageStream::~SkPDFImageStream() {} | |
| 41 | |
| 42 bool SkPDFImageStream::populate(SkPDFCatalog* catalog) { | |
| 43 if (getState() == kUnused_State) { | |
| 44 if (!skip_compression(catalog)) { | |
| 45 SkDynamicMemoryWStream dctCompressedWStream; | |
| 46 if (!fEncoder || !fEncoder(&dctCompressedWStream, fBitmap, fSrcRect)
) { | |
| 47 return INHERITED::populate(catalog); | |
| 48 } | |
| 49 | |
| 50 if (dctCompressedWStream.getOffset() < getData()->getLength()) { | |
| 51 SkData* data = dctCompressedWStream.copyToData(); | |
| 52 SkMemoryStream* stream = SkNEW_ARGS(SkMemoryStream, (data)); | |
| 53 setData(stream); | |
| 54 stream->unref(); | |
| 55 if (data) { | |
| 56 // copyToData and new SkMemoryStream both call ref(), supres
s one. | |
| 57 data->unref(); | |
| 58 } | |
| 59 | |
| 60 insertName("Filter", "DCTDecode"); | |
| 61 insertInt("ColorTransform", kNoColorTransform); | |
| 62 setState(kCompressed_State); | |
| 63 } | |
| 64 } | |
| 65 setState(kNoCompression_State); | |
| 66 insertInt("Length", getData()->getLength()); | |
| 67 } else if (getState() == kNoCompression_State && !skip_compression(catalog)
&& | |
| 68 (SkFlate::HaveFlate() || fEncoder)) { | |
| 69 // Compression has not been requested when the stream was first created. | |
| 70 // But a new Catalog would want it compressed. | |
| 71 if (!getSubstitute()) { | |
| 72 SkPDFImageStream* substitute = SkNEW_ARGS(SkPDFImageStream, (*this))
; | |
| 73 setSubstitute(substitute); | |
| 74 catalog->setSubstitute(this, substitute); | |
| 75 } | |
| 76 return false; | |
| 77 } | |
| 78 return true; | |
| 79 } | |
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