sd::slidesorter::cache::ResolutionReduction Class Reference

Compress a preview bitmap by reducing its resolution. More...

#include <SlsBitmapCompressor.hxx>

Inheritance diagram for sd::slidesorter::cache::ResolutionReduction:

Collaboration diagram for sd::slidesorter::cache::ResolutionReduction:

Classes
class	ResolutionReducedReplacement
	Store a scaled down bitmap together with the original size. More...

Public Member Functions
virtual	~ResolutionReduction ()
virtual std::shared_ptr< BitmapReplacement >	Compress (const BitmapEx &rpBitmap) const override
	Compress the given bitmap into a replacement format that is specific to the compressor class. More...
virtual BitmapEx	Decompress (const BitmapReplacement &rBitmapData) const override
	Scale the replacement bitmap up to the original size. More...
virtual bool	IsLossless () const override
	Return whether the compression and decompression is lossless. More...
virtual std::shared_ptr< BitmapReplacement >	Compress (const BitmapEx &rBitmap) const =0
	Compress the given bitmap into a replacement format that is specific to the compressor class. More...
virtual BitmapEx	Decompress (const BitmapReplacement &rBitmapData) const =0
	Decompress the given replacement data into a preview bitmap. More...
virtual bool	IsLossless () const =0
	Return whether the compression and decompression is lossless. More...

Static Private Attributes
static const sal_Int32	mnWidth = 100

Additional Inherited Members
Protected Member Functions inherited from sd::slidesorter::cache::BitmapCompressor
	~BitmapCompressor ()

Detailed Description

Compress a preview bitmap by reducing its resolution.

While the aspect ratio is maintained the horizontal resolution is scaled down to 100 pixels. This compressor is not lossless.

Definition at line 108 of file SlsBitmapCompressor.hxx.

Constructor & Destructor Documentation

~ResolutionReduction()

virtual sd::slidesorter::cache::ResolutionReduction::~ResolutionReduction ( )

inlinevirtual

Definition at line 114 of file SlsBitmapCompressor.hxx.

Member Function Documentation

Compress()

std::shared_ptr< BitmapReplacement > sd::slidesorter::cache::ResolutionReduction::Compress ( const BitmapEx &  rBitmap ) const

overridevirtual

Compress the given bitmap into a replacement format that is specific to the compressor class.

Implements sd::slidesorter::cache::BitmapCompressor.

Definition at line 102 of file SlsBitmapCompressor.cxx.

References BitmapEx::GetSizePixel(), Size::Height(), mnWidth, and Size::Width().

Decompress()

BitmapEx sd::slidesorter::cache::ResolutionReduction::Decompress ( const BitmapReplacement &  rBitmapData ) const

overridevirtual

Scale the replacement bitmap up to the original size.

Implements sd::slidesorter::cache::BitmapCompressor.

Definition at line 118 of file SlsBitmapCompressor.cxx.

References mnWidth, pData, and BitmapEx::Scale().

IsLossless()

bool sd::slidesorter::cache::ResolutionReduction::IsLossless ( ) const

overridevirtual

Return whether the compression and decompression is lossless.

This value is used by the caller of Decompress() to decide whether to use the returned bitmap as is or if a new preview has to be created.

Implements sd::slidesorter::cache::BitmapCompressor.

Definition at line 135 of file SlsBitmapCompressor.cxx.

Member Data Documentation

mnWidth

const sal_Int32 sd::slidesorter::cache::ResolutionReduction::mnWidth = 100

staticprivate

Definition at line 111 of file SlsBitmapCompressor.hxx.

Referenced by Compress(), and Decompress().

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The documentation for this class was generated from the following files:

• SlsBitmapCompressor.hxx
• SlsBitmapCompressor.cxx