Graphics::PaletteLookup Class Reference

Public Member Functions
	PaletteLookup (const byte *palette, uint len)
	Construct a new Palette Lookup object. More...
bool	setPalette (const byte *palette, uint len)
	Pass palette to the look up. It also compares given palette with the current one and resets cache only when their contents is different. More...
byte	findBestColor (byte r, byte g, byte b, ColorDistanceMethod method=kColorDistanceRedmean)
	This method returns closest color from the palette and it uses cache for faster lookups. More...
uint32 *	createMap (const byte *srcPalette, uint len, ColorDistanceMethod method=kColorDistanceRedmean)
	This method creates a map from the given palette that can be used by crossBlitMap(). More...

Constructor & Destructor Documentation

PaletteLookup()

Graphics::PaletteLookup::PaletteLookup	(	const byte *	palette,
		uint	len
	)

Construct a new Palette Lookup object.

Parameters

palette	the palette data, in interleaved RGB format
len	the number of palette entries to be read

Member Function Documentation

setPalette()

bool Graphics::PaletteLookup::setPalette	(	const byte *	palette,
		uint	len
	)

Pass palette to the look up. It also compares given palette with the current one and resets cache only when their contents is different.

Parameters

palette	the palette data, in interleaved RGB format
len	the number of palette entries to be read

Returns

true if palette was changed and false if it was the same

findBestColor()

byte Graphics::PaletteLookup::findBestColor	(	byte	r,
		byte	g,
		byte	b,
		ColorDistanceMethod	method = kColorDistanceRedmean
	)

This method returns closest color from the palette and it uses cache for faster lookups.

Parameters

method

the method used to determine the closest color

Returns

the palette index

createMap()

uint32* Graphics::PaletteLookup::createMap	(	const byte *	srcPalette,
		uint	len,
		ColorDistanceMethod	method = kColorDistanceRedmean
	)

This method creates a map from the given palette that can be used by crossBlitMap().

Parameters

palette	the palette data, in interleaved RGB format
len	the number of palette entries to be read
method	the method used to determine the closest color

Returns

the created map, or nullptr if one isn't needed.

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

• graphics/palette.h