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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkData.h"
#include "SkFlate.h"
#include "SkPDFCatalog.h"
#include "SkPDFImageStream.h"
#include "SkStream.h"
#define kNoColorTransform 0
static bool skip_compression(SkPDFCatalog* catalog) {
return SkToBool(catalog->getDocumentFlags() &
SkPDFDocument::kFavorSpeedOverSize_Flags);
}
// TODO(edisonn): Use SkData (after removing deprecated constructor in SkPDFStream).
SkPDFImageStream::SkPDFImageStream(SkStream* stream,
const SkBitmap& bitmap,
const SkIRect& srcRect,
EncodeToDCTStream encoder)
: SkPDFStream(stream),
fBitmap(bitmap),
fSrcRect(srcRect),
fEncoder(encoder) {
}
SkPDFImageStream::SkPDFImageStream(const SkPDFImageStream& pdfStream)
: SkPDFStream(pdfStream),
fBitmap(pdfStream.fBitmap),
fSrcRect(pdfStream.fSrcRect),
fEncoder(pdfStream.fEncoder) {
}
SkPDFImageStream::~SkPDFImageStream() {}
bool SkPDFImageStream::populate(SkPDFCatalog* catalog) {
if (getState() == kUnused_State) {
if (!skip_compression(catalog)) {
SkDynamicMemoryWStream dctCompressedWStream;
if (!fEncoder || !fEncoder(&dctCompressedWStream, fBitmap, fSrcRect)) {
return INHERITED::populate(catalog);
}
if (dctCompressedWStream.getOffset() < getData()->getLength()) {
SkData* data = dctCompressedWStream.copyToData();
SkMemoryStream* stream = SkNEW_ARGS(SkMemoryStream, (data));
setData(stream);
stream->unref();
if (data) {
// copyToData and new SkMemoryStream both call ref(), supress one.
data->unref();
}
insertName("Filter", "DCTDecode");
insertInt("ColorTransform", kNoColorTransform);
setState(kCompressed_State);
}
}
setState(kNoCompression_State);
insertInt("Length", getData()->getLength());
} else if (getState() == kNoCompression_State && !skip_compression(catalog) &&
(SkFlate::HaveFlate() || fEncoder)) {
// Compression has not been requested when the stream was first created.
// But a new Catalog would want it compressed.
if (!getSubstitute()) {
SkPDFImageStream* substitute = SkNEW_ARGS(SkPDFImageStream, (*this));
setSubstitute(substitute);
catalog->setSubstitute(this, substitute);
}
return false;
}
return true;
}
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