Class TPngEncodeData

class TPngEncodeData : public TFrameDataBlock;

Description

PNG specific frame data variant which holds PNG encoding information.

It can only be used with the PNG encoder.

Derivation

• TFrameDataBlock - The abstract base class for all format-specific frame data variants.

• TPngEncodeData - PNG specific frame data variant which holds PNG encoding information.

Members

Defined in TPngEncodeData:

• DuplicateL(CFrameImageData &)constProvides a copy of an object that manages a list of frame and image block data, ...
• EBestCompressionOptimise compression for size.
• EBestSpeedOptimise compression for speed.
• EDefaultCompressionDefault level of compression used.
• ENoCompressionNo compression used.
• TPngCompressLevelA flag reflecting the level of compression used.
• TPngEncodeData()Default constructor for this class.
• iBitsPerPixelThe number of bits per pixel.
• iColorA flag indicating if the image is color or grayscale.
• iLevelThe level of compression to apply.
• iPalettedA flag indicating use of a palette or RGB.

Inherited from TFrameDataBlock:

• DataType()constReturns the data type of the current TFrameDataBlock object.
• TFrameDataBlock(TUid)Constructs and initialises the TFrameDataBlock object to the data type specified...

IMPORT_C TPngEncodeData();

Description

Default constructor for this class.

private: virtual TFrameDataBlock* DuplicateL(CFrameImageData &aFrameImageData) const;

Description

Provides a copy of an object that manages a list of frame and image block data, but not a bitwise copy. It provides a new reference to the object.

Parameters

CFrameImageData &aFrameImageData An object that manages a list of frame and image block data

Return value

TFrameDataBlock *

TPngCompressLevel

Description

A flag reflecting the level of compression used.

EDefaultCompression Default level of compression used. ENoCompression No compression used. EBestSpeed Optimise compression for speed. EBestCompression Optimise compression for size.

TInt iBitsPerPixel;

Description

The number of bits per pixel.

TBool iColor;

Description

A flag indicating if the image is color or grayscale.

TBool iPaletted;

Description

A flag indicating use of a palette or RGB.

TPngCompressLevel iLevel;

Description

The level of compression to apply.