Hjg.Pngcs.Chunks.PngChunkPLTE Class Reference

PLTE Palette chunk: this is the only optional critical chunk More...

Inherits Hjg.Pngcs.Chunks.PngChunkSingle.

Public Member Functions
	PngChunkPLTE (ImageInfo info)
override ChunkOrderingConstraint	GetOrderingConstraint ()
	Get ordering constrain
override ChunkRaw	CreateRawChunk ()
	Serialization. Creates a Raw chunk, ready for write, from this chunk content
override void	ParseFromRaw (ChunkRaw chunk)
	Deserialization. Given a Raw chunk, just rad, fills this chunk content
override void	CloneDataFromRead (PngChunk other)
	Override to make a copy (normally deep) from other chunk
void	SetNentries (int nentries)
	Also allocates array
int	GetNentries ()
void	SetEntry (int n, int r, int g, int b)
int	GetEntry (int n)
	as packed RGB8
void	GetEntryRgb (int index, int[] rgb, int offset)
	Gets n'th entry, filling 3 positions of given array, at given offset
void	GetEntryRgb (int n, int[] rgb)
	shortcut: GetEntryRgb(index, int[] rgb, 0)
int	MinBitDepth ()
	minimum allowed bit depth, given palette size
Public Member Functions inherited from Hjg.Pngcs.Chunks.PngChunkSingle
	PngChunkSingle (String id, ImageInfo imgInfo)
sealed override bool	AllowsMultiple ()
	This is implemented in PngChunkMultiple/PngChunSingle
override int	GetHashCode ()
override bool	Equals (object obj)
Public Member Functions inherited from Hjg.Pngcs.Chunks.PngChunk
ChunkRaw	createEmptyChunk (int len, bool alloc)
override String	ToString ()
	Basic info: Id, length, Type name

Public Attributes
const String	ID = ChunkHelper.PLTE

Additional Inherited Members
Public Types inherited from Hjg.Pngcs.Chunks.PngChunk
enum	ChunkOrderingConstraint {   NONE, BEFORE_PLTE_AND_IDAT, AFTER_PLTE_BEFORE_IDAT, BEFORE_IDAT,   NA }
	Restrictions for chunk ordering, for ancillary chunks More...
Static Public Member Functions inherited from Hjg.Pngcs.Chunks.PngChunk
static void	FactoryRegister (String chunkId, Type type)
	Registers a Chunk ID in the factory, to instantiate a given type
static T	CloneChunk< T > (T chunk, ImageInfo info)
Protected Member Functions inherited from Hjg.Pngcs.Chunks.PngChunk
	PngChunk (String id, ImageInfo imgInfo)
	Constructs an empty chunk
Protected Attributes inherited from Hjg.Pngcs.Chunks.PngChunk
readonly ImageInfo	ImgInfo
	Image basic info, mostly for some checks
Properties inherited from Hjg.Pngcs.Chunks.PngChunk
bool	Priority [get, set]
	For writing. Queued chunks with high priority will be written as soon as possible
int	ChunkGroup [get, set]
	Chunk group where it was read or writen
int	Length [get, set]
long	Offset [get, set]

Detailed Description

PLTE Palette chunk: this is the only optional critical chunk

http://www.w3.org/TR/PNG/#11PLTE

Constructor & Destructor Documentation

Hjg.Pngcs.Chunks.PngChunkPLTE.PngChunkPLTE

(

ImageInfo

info

)

Member Function Documentation

override ChunkOrderingConstraint Hjg.Pngcs.Chunks.PngChunkPLTE.GetOrderingConstraint ( )

virtual

Get ordering constrain

Returns

Implements Hjg.Pngcs.Chunks.PngChunk.

override ChunkRaw Hjg.Pngcs.Chunks.PngChunkPLTE.CreateRawChunk ( )

virtual

Serialization. Creates a Raw chunk, ready for write, from this chunk content

Implements Hjg.Pngcs.Chunks.PngChunk.

override void Hjg.Pngcs.Chunks.PngChunkPLTE.ParseFromRaw ( ChunkRaw  c )

virtual

Deserialization. Given a Raw chunk, just rad, fills this chunk content

Implements Hjg.Pngcs.Chunks.PngChunk.

override void Hjg.Pngcs.Chunks.PngChunkPLTE.CloneDataFromRead ( PngChunk  other )

virtual

Override to make a copy (normally deep) from other chunk

Parameters

other

Implements Hjg.Pngcs.Chunks.PngChunk.

void Hjg.Pngcs.Chunks.PngChunkPLTE.SetNentries

(

int

nentries

)

Also allocates array

Parameters

nentries

1-256

int Hjg.Pngcs.Chunks.PngChunkPLTE.GetNentries

(

)

void Hjg.Pngcs.Chunks.PngChunkPLTE.SetEntry	(	int	n,
		int	r,
		int	g,
		int	b
	)

int Hjg.Pngcs.Chunks.PngChunkPLTE.GetEntry

(

int

n

)

as packed RGB8

Parameters

n

Returns

void Hjg.Pngcs.Chunks.PngChunkPLTE.GetEntryRgb	(	int	index,
		int[]	rgb,
		int	offset
	)

Gets n'th entry, filling 3 positions of given array, at given offset

Parameters

index
rgb
offset

void Hjg.Pngcs.Chunks.PngChunkPLTE.GetEntryRgb	(	int	n,
		int[]	rgb
	)

shortcut: GetEntryRgb(index, int[] rgb, 0)

Parameters

n
rgb

int Hjg.Pngcs.Chunks.PngChunkPLTE.MinBitDepth

(

)

minimum allowed bit depth, given palette size

Returns

1-2-4-8

Member Data Documentation

const String Hjg.Pngcs.Chunks.PngChunkPLTE.ID = ChunkHelper.PLTE