SkPDF: PDFStream has-a not is-a PDFDict

src/pdf/SkPDFStream.cpp

-/*
- * Copyright 2010 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 "SkDeflate.h"
-#include "SkPDFStream.h"
-#include "SkStreamPriv.h"
-
-SkPDFStream::~SkPDFStream() {}
-
-void SkPDFStream::drop() {
-    fCompressedData.reset(nullptr);
-    this->SkPDFDict::drop();
-}
-
-void SkPDFStream::emitObject(SkWStream* stream,
-                             const SkPDFObjNumMap& objNumMap,
-                             const SkPDFSubstituteMap& substitutes) const {
-    SkASSERT(fCompressedData);
-    this->INHERITED::emitObject(stream, objNumMap, substitutes);
-    // duplicate (a cheap operation) preserves const on fCompressedData.
-    std::unique_ptr<SkStreamAsset> dup(fCompressedData->duplicate());
-    SkASSERT(dup);
-    SkASSERT(dup->hasLength());
-    stream->writeText(" stream\n");
-    stream->writeStream(dup.get(), dup->getLength());
-    stream->writeText("\nendstream");
-}
-
-void SkPDFStream::setData(std::unique_ptr<SkStreamAsset> stream) {
-    SkASSERT(!fCompressedData);  // Only call this function once.
-    SkASSERT(stream);
-    // Code assumes that the stream starts at the beginning.
-
-    #ifdef SK_PDF_LESS_COMPRESSION
-    fCompressedData = std::move(stream);
-    SkASSERT(fCompressedData && fCompressedData->hasLength());
-    this->insertInt("Length", fCompressedData->getLength());
-    #else
-
-    SkASSERT(stream->hasLength());
-    SkDynamicMemoryWStream compressedData;
-    SkDeflateWStream deflateWStream(&compressedData);
-    SkStreamCopy(&deflateWStream, stream.get());
-    deflateWStream.finalize();
-    size_t compressedLength = compressedData.bytesWritten();
-    size_t originalLength = stream->getLength();
-
-    if (originalLength <= compressedLength + strlen("/Filter_/FlateDecode_")) {
-        SkAssertResult(stream->rewind());
-        fCompressedData = std::move(stream);
-        this->insertInt("Length", originalLength);
-        return;
-    }
-    fCompressedData.reset(compressedData.detachAsStream());
-    this->insertName("Filter", "FlateDecode");
-    this->insertInt("Length", compressedLength);
-    #endif
-}