colorred.h File Reference

24bit RGB to 8bit indexed functions More...

#include "struct.h"

Include dependency graph for colorred.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	CT_Node
	Color Tree node. More...
struct	CT_Tree
	Color Tree. More...

Functions
CT_Tree *	CT_new ()
void	CT_delete (CT_Tree *t)
byte	CT_get (CT_Tree *t, byte r, byte g, byte b)
	find the leaf that also contains (rgb) More...
void	CT_set (CT_Tree *colorTree, byte Rmin, byte Gmin, byte Bmin, byte Rmax, byte Gmax, byte Bmax, byte index)
	insert a node in the color tree More...

Detailed Description

24bit RGB to 8bit indexed functions

Octree for mapping RGB to color. A bit slower than a plain conversion table in theory, but : Faster than running a search in the palette Takes less memory than the huge conversion table No loss of precision

Function Documentation

CT_new()

CT_Tree * CT_new

(

)

Referenced by Optimize_palette().

CT_delete()

void CT_delete

(

CT_Tree *

t

)

Referenced by Convert_24b_bitmap_to_256(), and Optimize_palette().

CT_get()

byte CT_get	(	CT_Tree *	tree,
		byte	r,
		byte	g,
		byte	b
	)

find the leaf that also contains (rgb)

pre condition: node contains (rgb)

References CT_Node::Bmax, CT_Node::Bmin, CT_Node::children, CT_Node::Gmax, CT_Node::Gmin, CT_Tree::nodes, CT_Node::Rmax, and CT_Node::Rmin.

Referenced by Convert_24b_bitmap_to_256_Floyd_Steinberg(), and Convert_24b_bitmap_to_256_nearest_neighbor().

CT_set()

void CT_set	(	CT_Tree *	colorTree,
		byte	Rmin,
		byte	Gmin,
		byte	Bmin,
		byte	Rmax,
		byte	Gmax,
		byte	Bmax,
		byte	index
	)

insert a node in the color tree

References CT_Node::Bmax, CT_Node::Bmin, CT_Node::children, CT_Node::Gmax, CT_Node::Gmin, CT_Tree::nodecount, CT_Tree::nodes, CT_Node::Rmax, and CT_Node::Rmin.

Referenced by CT_set_trad().