Doxygen Source Code Documentation
Main Page Alphabetical List Data Structures File List Data Fields Globals Search
rdcolmap.c
Go to the documentation of this file.00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024 #include "cdjpeg.h"
00025
00026 #ifdef QUANT_2PASS_SUPPORTED
00027
00028
00029
00030
00031
00032
00033
00034
00035
00036
00037
00038
00039
00040
00041
00042
00043
00044
00045 LOCAL(void)
00046 add_map_entry (j_decompress_ptr cinfo, int R, int G, int B)
00047 {
00048 JSAMPROW colormap0 = cinfo->colormap[0];
00049 JSAMPROW colormap1 = cinfo->colormap[1];
00050 JSAMPROW colormap2 = cinfo->colormap[2];
00051 int ncolors = cinfo->actual_number_of_colors;
00052 int index;
00053
00054
00055 for (index = 0; index < ncolors; index++) {
00056 if (GETJSAMPLE(colormap0[index]) == R &&
00057 GETJSAMPLE(colormap1[index]) == G &&
00058 GETJSAMPLE(colormap2[index]) == B)
00059 return;
00060 }
00061
00062
00063 if (ncolors >= (MAXJSAMPLE+1))
00064 ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, (MAXJSAMPLE+1));
00065
00066
00067 colormap0[ncolors] = (JSAMPLE) R;
00068 colormap1[ncolors] = (JSAMPLE) G;
00069 colormap2[ncolors] = (JSAMPLE) B;
00070 cinfo->actual_number_of_colors++;
00071 }
00072
00073
00074
00075
00076
00077
00078 LOCAL(void)
00079 read_gif_map (j_decompress_ptr cinfo, FILE * infile)
00080 {
00081 int header[13];
00082 int i, colormaplen;
00083 int R, G, B;
00084
00085
00086
00087 for (i = 1; i < 13; i++) {
00088 if ((header[i] = getc(infile)) == EOF)
00089 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00090 }
00091
00092
00093 if (header[1] != 'I' || header[2] != 'F')
00094 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00095
00096
00097 if ((header[10] & 0x80) == 0)
00098 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00099
00100
00101 colormaplen = 2 << (header[10] & 0x07);
00102
00103 for (i = 0; i < colormaplen; i++) {
00104 R = getc(infile);
00105 G = getc(infile);
00106 B = getc(infile);
00107 if (R == EOF || G == EOF || B == EOF)
00108 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00109 add_map_entry(cinfo,
00110 R << (BITS_IN_JSAMPLE-8),
00111 G << (BITS_IN_JSAMPLE-8),
00112 B << (BITS_IN_JSAMPLE-8));
00113 }
00114 }
00115
00116
00117
00118
00119
00120 LOCAL(int)
00121 pbm_getc (FILE * infile)
00122
00123
00124 {
00125 register int ch;
00126
00127 ch = getc(infile);
00128 if (ch == '#') {
00129 do {
00130 ch = getc(infile);
00131 } while (ch != '\n' && ch != EOF);
00132 }
00133 return ch;
00134 }
00135
00136
00137 LOCAL(unsigned int)
00138 read_pbm_integer (j_decompress_ptr cinfo, FILE * infile)
00139
00140
00141
00142
00143 {
00144 register int ch;
00145 register unsigned int val;
00146
00147
00148 do {
00149 ch = pbm_getc(infile);
00150 if (ch == EOF)
00151 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00152 } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
00153
00154 if (ch < '0' || ch > '9')
00155 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00156
00157 val = ch - '0';
00158 while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') {
00159 val *= 10;
00160 val += ch - '0';
00161 }
00162 return val;
00163 }
00164
00165
00166
00167
00168
00169
00170 LOCAL(void)
00171 read_ppm_map (j_decompress_ptr cinfo, FILE * infile)
00172 {
00173 int c;
00174 unsigned int w, h, maxval, row, col;
00175 int R, G, B;
00176
00177
00178 c = getc(infile);
00179
00180
00181 w = read_pbm_integer(cinfo, infile);
00182 h = read_pbm_integer(cinfo, infile);
00183 maxval = read_pbm_integer(cinfo, infile);
00184
00185 if (w <= 0 || h <= 0 || maxval <= 0)
00186 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00187
00188
00189 if (maxval != (unsigned int) MAXJSAMPLE)
00190 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00191
00192 switch (c) {
00193 case '3':
00194 for (row = 0; row < h; row++) {
00195 for (col = 0; col < w; col++) {
00196 R = read_pbm_integer(cinfo, infile);
00197 G = read_pbm_integer(cinfo, infile);
00198 B = read_pbm_integer(cinfo, infile);
00199 add_map_entry(cinfo, R, G, B);
00200 }
00201 }
00202 break;
00203
00204 case '6':
00205 for (row = 0; row < h; row++) {
00206 for (col = 0; col < w; col++) {
00207 R = getc(infile);
00208 G = getc(infile);
00209 B = getc(infile);
00210 if (R == EOF || G == EOF || B == EOF)
00211 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00212 add_map_entry(cinfo, R, G, B);
00213 }
00214 }
00215 break;
00216
00217 default:
00218 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00219 break;
00220 }
00221 }
00222
00223
00224
00225
00226
00227
00228
00229
00230 GLOBAL(void)
00231 read_color_map (j_decompress_ptr cinfo, FILE * infile)
00232 {
00233
00234 cinfo->colormap = (*cinfo->mem->alloc_sarray)
00235 ((j_common_ptr) cinfo, JPOOL_IMAGE,
00236 (JDIMENSION) (MAXJSAMPLE+1), (JDIMENSION) 3);
00237 cinfo->actual_number_of_colors = 0;
00238
00239
00240 switch (getc(infile)) {
00241 case 'G':
00242 read_gif_map(cinfo, infile);
00243 break;
00244 case 'P':
00245 read_ppm_map(cinfo, infile);
00246 break;
00247 default:
00248 ERREXIT(cinfo, JERR_BAD_CMAP_FILE);
00249 break;
00250 }
00251 }
00252
00253 #endif