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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include "SlsBitmapCompressor.hxx"
#include <tools/stream.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/pngread.hxx>
#include <vcl/pngwrite.hxx>
namespace sd::slidesorter::cache {
//===== NoBitmapCompression ===================================================
/** This dummy replacement simply stores a shared pointer to the original
preview bitmap.
*/
class NoBitmapCompression::DummyReplacement
: public BitmapReplacement
{
public:
BitmapEx maPreview;
explicit DummyReplacement (const BitmapEx& rPreview) : maPreview(rPreview) { }
virtual ~DummyReplacement() {}
virtual sal_Int32 GetMemorySize() const override { return maPreview.GetSizeBytes(); }
};
std::shared_ptr<BitmapReplacement> NoBitmapCompression::Compress (const BitmapEx& rBitmap) const
{
return std::make_shared<DummyReplacement>(rBitmap);
}
BitmapEx NoBitmapCompression::Decompress (const BitmapReplacement& rBitmapData) const
{
return dynamic_cast<const DummyReplacement&>(rBitmapData).maPreview;
}
bool NoBitmapCompression::IsLossless() const
{
return true;
}
//===== CompressionByDeletion =================================================
std::shared_ptr<BitmapReplacement> CompressionByDeletion::Compress (const BitmapEx& ) const
{
return std::shared_ptr<BitmapReplacement>();
}
BitmapEx CompressionByDeletion::Decompress (const BitmapReplacement& ) const
{
// Return a NULL pointer. This will eventually lead to a request for
// the creation of a new one.
return BitmapEx();
}
bool CompressionByDeletion::IsLossless() const
{
return false;
}
//===== ResolutionReduction ===================================================
/** Store a scaled down bitmap together with the original size.
*/
class ResolutionReduction::ResolutionReducedReplacement : public BitmapReplacement
{
public:
BitmapEx maPreview;
Size maOriginalSize;
virtual ~ResolutionReducedReplacement();
virtual sal_Int32 GetMemorySize() const override;
};
ResolutionReduction::ResolutionReducedReplacement::~ResolutionReducedReplacement()
{
}
sal_Int32 ResolutionReduction::ResolutionReducedReplacement::GetMemorySize() const
{
return maPreview.GetSizeBytes();
}
std::shared_ptr<BitmapReplacement> ResolutionReduction::Compress (
const BitmapEx& rBitmap) const
{
auto pResult = std::make_shared<ResolutionReducedReplacement>();
pResult->maPreview = rBitmap;
Size aSize (rBitmap.GetSizePixel());
pResult->maOriginalSize = aSize;
if (aSize.Width()>0 && aSize.Width()<mnWidth)
{
int nHeight = aSize.Height() * mnWidth / aSize.Width() ;
pResult->maPreview.Scale(Size(mnWidth,nHeight));
}
return pResult;
}
BitmapEx ResolutionReduction::Decompress (const BitmapReplacement& rBitmapData) const
{
BitmapEx aResult;
const ResolutionReducedReplacement* pData (
dynamic_cast<const ResolutionReducedReplacement*>(&rBitmapData));
if ( pData && ! pData->maPreview.IsEmpty())
{
aResult = pData->maPreview;
if (pData->maOriginalSize.Width() > mnWidth)
aResult.Scale(pData->maOriginalSize);
}
return aResult;
}
bool ResolutionReduction::IsLossless() const
{
return false;
}
//===== PNGCompression ========================================================
class PngCompression::PngReplacement : public BitmapReplacement
{
public:
void* mpData;
sal_Int32 mnDataSize;
PngReplacement()
: mpData(nullptr),
mnDataSize(0)
{}
virtual ~PngReplacement()
{
delete [] static_cast<char*>(mpData);
}
virtual sal_Int32 GetMemorySize() const override
{
return mnDataSize;
}
};
std::shared_ptr<BitmapReplacement> PngCompression::Compress (const BitmapEx& rBitmap) const
{
vcl::PNGWriter aWriter(rBitmap);
SvMemoryStream aStream (32768, 32768);
aWriter.Write(aStream);
auto pResult = std::make_shared<PngReplacement>();
pResult->mnDataSize = aStream.Tell();
pResult->mpData = new char[pResult->mnDataSize];
memcpy(pResult->mpData, aStream.GetData(), pResult->mnDataSize);
return pResult;
}
BitmapEx PngCompression::Decompress (
const BitmapReplacement& rBitmapData) const
{
BitmapEx aResult;
const PngReplacement* pData (dynamic_cast<const PngReplacement*>(&rBitmapData));
if (pData != nullptr)
{
SvMemoryStream aStream (pData->mpData, pData->mnDataSize, StreamMode::READ);
vcl::PNGReader aReader (aStream);
aResult = aReader.Read().GetBitmap();
}
return aResult;
}
bool PngCompression::IsLossless() const
{
return true;
}
} // end of namespace ::sd::slidesorter::cache
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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