dl1quant.h

JPEG压缩解压缩源代码

//
//	This has been modified from Dennis Lee's original version
//	

/*
 * File: dl1quant.h
 *
 * Header file for dl1quant.c (DL1 Quantization)
 *
 * Copyright (C) 1993-1997 Dennis Lee
 */

#ifndef DL1QUANT_H
#define DL1QUANT_H

#include "basic.h"

#ifdef __cplusplus
extern "C" {
#endif


typedef struct {
    ulong r, g, b;
    ulong pixel_count;
    ulong pixels_in_cube;
    uchar children;
    uchar palette_index;
    } CUBE;

typedef struct {
    uchar  level;
    ushort index;
    } FCUBE;

typedef struct {
    uchar palette_index,
	  red, green, blue;
    ulong distance;
    ulong squares[255+255+1];
    } CLOSEST_INFO;

GLOBAL int
dl1quant(uchar *inbuf, 
		 uchar *outbuf, 
		 int width, 
		 int height, 
		 int quant_to,
		 int dither, 
		 uchar userpal[3][256]);

LOCAL  void copy_pal(uchar userpal[3][256]);
LOCAL  void dlq_init(void);
LOCAL  int  dlq_start(void);
LOCAL  void dlq_finish(void);
LOCAL  int  build_table(uchar *image, ulong pixels);
LOCAL  void fixheap(ulong id);
LOCAL  void reduce_table(int num_colors);
LOCAL  void set_palette(int index, int level);
LOCAL  void closest_color(int index, int level);
LOCAL  int  quantize_image(uchar *in, uchar *out, int width, int height, 
			   int dither);
LOCAL  int  bestcolor(int r, int g, int b);

#endif

#ifdef __cplusplus
}
#endif