1 /* quantize.h: Quantize a high color bitmap 2 3 Copyright (C) 2001, 2002 Martin Weber 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public License 7 as published by the Free Software Foundation; either version 2.1 of 8 the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 18 USA. */ 19 20 #include "bitmap.h" 21 #include "color.h" 22 #include "exception.h" 23 24 #ifndef QUANTIZE_H 25 #define QUANTIZE_H 26 27 #define PRECISION_R 7 28 #define PRECISION_G 7 29 #define PRECISION_B 7 30 31 #define HIST_R_ELEMS (1<<PRECISION_R) 32 #define HIST_G_ELEMS (1<<PRECISION_G) 33 #define HIST_B_ELEMS (1<<PRECISION_B) 34 35 #define MR HIST_G_ELEMS*HIST_B_ELEMS 36 #define MG HIST_B_ELEMS 37 38 typedef unsigned long ColorFreq; 39 typedef ColorFreq *Histogram; 40 41 typedef struct { 42 int desired_number_of_colors; /* Number of colors we will allow */ 43 int actual_number_of_colors; /* Number of colors actually needed */ 44 color_type cmap[256]; /* colormap created by quantization */ 45 ColorFreq freq[256]; 46 Histogram histogram; /* holds the histogram */ 47 } QuantizeObj; 48 49 void quantize(bitmap_type*, long ncolors, const color_type *bgColor, 50 QuantizeObj**, at_exception_type * exp); 51 52 void quantize_object_free(QuantizeObj * obj); 53 #endif /* NOT QUANTIZE_H */ 54 55