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265
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1 /* Image processing aux functions header file
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2 Copyright (C) 1998 Jareth Hein
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3
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4 This file is a part of XEmacs
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* Original author: Jareth Hein */
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24
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25 #define MAX_CMAP_SIZE 256
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26 #define COLOR_DEPTH 8
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27 #define MAX_COLOR 256
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28
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29 #define B_DEPTH 5 /* # bits/pixel to use */
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30 #define B_LEN (1L<<B_DEPTH)
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31
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32 #define C_DEPTH 2
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33 #define C_LEN (1L<<C_DEPTH) /* # cells/color to use */
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34
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35 #define COLOR_SHIFT (COLOR_DEPTH-B_DEPTH)
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36
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37 typedef struct colorbox {
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38 struct colorbox *next, *prev;
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39 int rmin, rmax;
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40 int gmin, gmax;
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41 int bmin, bmax;
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42 int total;
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43 } Colorbox;
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44
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45 typedef struct {
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46 int num_ents;
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47 int entries[MAX_CMAP_SIZE][2];
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48 } C_cell;
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49
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50 typedef struct {
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51 unsigned short rm[MAX_CMAP_SIZE], gm[MAX_CMAP_SIZE], bm[MAX_CMAP_SIZE]; /* map values */
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52 int um[MAX_CMAP_SIZE]; /* usage counts for each mapentry */
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53 int histogram[B_LEN][B_LEN][B_LEN];
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54 int num_active_colors;
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55 Colorbox *freeboxes; /* used and freed internally */
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56 Colorbox *usedboxes; /* used and freed internally */
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57 C_cell **ColorCells; /* used and freed internally */
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58 } quant_table;
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59
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60 #define QUANT_GET_COLOR(qt,r,g,b) (qt->histogram[r>>COLOR_SHIFT][g>>COLOR_SHIFT][b>>COLOR_SHIFT])
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61
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62 quant_table *EImage_build_quantable(unsigned char *eimage, int width, int height, int num_colors);
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