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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 3 of the License, or (at your
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9 option) any 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. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 #ifndef INCLUDED_imgproc_h_
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20 #define INCLUDED_imgproc_h_
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* Original author: Jareth Hein */
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25
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26 #define MAX_CMAP_SIZE 256
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27 #define COLOR_DEPTH 8
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28 #define MAX_COLOR 256
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29
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30 #define B_DEPTH 5 /* # bits/pixel to use */
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31 #define B_LEN (1L<<B_DEPTH)
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32
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33 #define C_DEPTH 2
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34 #define C_LEN (1L<<C_DEPTH) /* # cells/color to use */
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35
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36 #define COLOR_SHIFT (COLOR_DEPTH-B_DEPTH)
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37
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38 typedef struct colorbox {
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39 struct colorbox *next, *prev;
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40 int rmin, rmax;
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41 int gmin, gmax;
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42 int bmin, bmax;
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43 int total;
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44 } Colorbox;
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45
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46 typedef struct {
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47 int num_ents;
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48 int entries[MAX_CMAP_SIZE][2];
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49 } C_cell;
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50
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51 typedef struct {
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52 unsigned short rm[MAX_CMAP_SIZE], gm[MAX_CMAP_SIZE], bm[MAX_CMAP_SIZE]; /* map values */
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53 int um[MAX_CMAP_SIZE]; /* usage counts for each mapentry */
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54 int histogram[B_LEN][B_LEN][B_LEN];
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55 int num_active_colors;
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56 Colorbox *freeboxes; /* used and freed internally */
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57 Colorbox *usedboxes; /* used and freed internally */
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58 C_cell **ColorCells; /* used and freed internally */
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59 } quant_table;
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60
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61 #define QUANT_GET_COLOR(qt,r,g,b) (qt->histogram[r>>COLOR_SHIFT][g>>COLOR_SHIFT][b>>COLOR_SHIFT])
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62
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63 quant_table *build_EImage_quantable(unsigned char *eimage, int width, int height, int num_colors);
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64
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65 #endif /* INCLUDED_imgproc_h_ */
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