SlsBitmapCompressor.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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 */
 
#pragma once
 
#include <sal/types.h>
#include <memory>
 
class BitmapEx;
 
namespace sd::slidesorter::cache
{
class BitmapReplacement;
 
class BitmapCompressor
{
public:
    virtual std::shared_ptr<BitmapReplacement> Compress(const BitmapEx& rBitmap) const = 0;
 
    virtual BitmapEx Decompress(const BitmapReplacement& rBitmapData) const = 0;
 
    virtual bool IsLossless() const = 0;
 
protected:
    ~BitmapCompressor() {}
};
 
class BitmapReplacement
{
public:
    virtual sal_Int32 GetMemorySize() const { return 0; }
 
protected:
    ~BitmapReplacement() {}
};
 
class NoBitmapCompression : public BitmapCompressor
{
    class DummyReplacement;
 
public:
    virtual ~NoBitmapCompression() {}
    virtual std::shared_ptr<BitmapReplacement> Compress(const BitmapEx& rpBitmap) const override;
    virtual BitmapEx Decompress(const BitmapReplacement& rBitmapData) const override;
    virtual bool IsLossless() const override;
};
 
class CompressionByDeletion : public BitmapCompressor
{
public:
    virtual ~CompressionByDeletion() {}
    virtual std::shared_ptr<BitmapReplacement> Compress(const BitmapEx& rBitmap) const override;
    virtual BitmapEx Decompress(const BitmapReplacement& rBitmapData) const override;
    virtual bool IsLossless() const override;
};
 
class ResolutionReduction : public BitmapCompressor
{
    class ResolutionReducedReplacement;
    static const sal_Int32 mnWidth = 100;
 
public:
    virtual ~ResolutionReduction() {}
    virtual std::shared_ptr<BitmapReplacement> Compress(const BitmapEx& rpBitmap) const override;
    virtual BitmapEx Decompress(const BitmapReplacement& rBitmapData) const override;
    virtual bool IsLossless() const override;
};
 
class PngCompression : public BitmapCompressor
{
    class PngReplacement;
 
public:
    virtual ~PngCompression() {}
    virtual std::shared_ptr<BitmapReplacement> Compress(const BitmapEx& rBitmap) const override;
    virtual BitmapEx Decompress(const BitmapReplacement& rBitmapData) const override;
    virtual bool IsLossless() const override;
};
 
} // end of namespace ::sd::slidesorter::cache
 
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