1 /* Image processing aux functions header file
2 Copyright (C) 1998 Jareth Hein
4 This file is a part of XEmacs
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Synched up with: Not in FSF. */
23 /* Original author: Jareth Hein */
25 #define MAX_CMAP_SIZE 256
29 #define B_DEPTH 5 /* # bits/pixel to use */
30 #define B_LEN (1L<<B_DEPTH)
33 #define C_LEN (1L<<C_DEPTH) /* # cells/color to use */
35 #define COLOR_SHIFT (COLOR_DEPTH-B_DEPTH)
37 typedef struct colorbox {
38 struct colorbox *next, *prev;
47 int entries[MAX_CMAP_SIZE][2];
51 unsigned short rm[MAX_CMAP_SIZE], gm[MAX_CMAP_SIZE], bm[MAX_CMAP_SIZE]; /* map values */
52 int um[MAX_CMAP_SIZE]; /* usage counts for each mapentry */
53 int histogram[B_LEN][B_LEN][B_LEN];
54 int num_active_colors;
55 Colorbox *freeboxes; /* used and freed internally */
56 Colorbox *usedboxes; /* used and freed internally */
57 C_cell **ColorCells; /* used and freed internally */
60 #define QUANT_GET_COLOR(qt,r,g,b) (qt->histogram[r>>COLOR_SHIFT][g>>COLOR_SHIFT][b>>COLOR_SHIFT])
62 quant_table *build_EImage_quantable(unsigned char *eimage, int width, int height, int num_colors);