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Diffstat (limited to 'libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdcolmap.c')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdcolmap.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdcolmap.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdcolmap.c new file mode 100644 index 0000000..eebf834 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdcolmap.c | |||
@@ -0,0 +1,253 @@ | |||
1 | /* | ||
2 | * rdcolmap.c | ||
3 | * | ||
4 | * Copyright (C) 1994-1996, Thomas G. Lane. | ||
5 | * This file is part of the Independent JPEG Group's software. | ||
6 | * For conditions of distribution and use, see the accompanying README file. | ||
7 | * | ||
8 | * This file implements djpeg's "-map file" switch. It reads a source image | ||
9 | * and constructs a colormap to be supplied to the JPEG decompressor. | ||
10 | * | ||
11 | * Currently, these file formats are supported for the map file: | ||
12 | * GIF: the contents of the GIF's global colormap are used. | ||
13 | * PPM (either text or raw flavor): the entire file is read and | ||
14 | * each unique pixel value is entered in the map. | ||
15 | * Note that reading a large PPM file will be horrendously slow. | ||
16 | * Typically, a PPM-format map file should contain just one pixel | ||
17 | * of each desired color. Such a file can be extracted from an | ||
18 | * ordinary image PPM file with ppmtomap(1). | ||
19 | * | ||
20 | * Rescaling a PPM that has a maxval unequal to MAXJSAMPLE is not | ||
21 | * currently implemented. | ||
22 | */ | ||
23 | |||
24 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ | ||
25 | |||
26 | #ifdef QUANT_2PASS_SUPPORTED /* otherwise can't quantize to supplied map */ | ||
27 | |||
28 | /* Portions of this code are based on the PBMPLUS library, which is: | ||
29 | ** | ||
30 | ** Copyright (C) 1988 by Jef Poskanzer. | ||
31 | ** | ||
32 | ** Permission to use, copy, modify, and distribute this software and its | ||
33 | ** documentation for any purpose and without fee is hereby granted, provided | ||
34 | ** that the above copyright notice appear in all copies and that both that | ||
35 | ** copyright notice and this permission notice appear in supporting | ||
36 | ** documentation. This software is provided "as is" without express or | ||
37 | ** implied warranty. | ||
38 | */ | ||
39 | |||
40 | |||
41 | /* | ||
42 | * Add a (potentially) new color to the color map. | ||
43 | */ | ||
44 | |||
45 | LOCAL(void) | ||
46 | add_map_entry (j_decompress_ptr cinfo, int R, int G, int B) | ||
47 | { | ||
48 | JSAMPROW colormap0 = cinfo->colormap[0]; | ||
49 | JSAMPROW colormap1 = cinfo->colormap[1]; | ||
50 | JSAMPROW colormap2 = cinfo->colormap[2]; | ||
51 | int ncolors = cinfo->actual_number_of_colors; | ||
52 | int index; | ||
53 | |||
54 | /* Check for duplicate color. */ | ||
55 | for (index = 0; index < ncolors; index++) { | ||
56 | if (GETJSAMPLE(colormap0[index]) == R && | ||
57 | GETJSAMPLE(colormap1[index]) == G && | ||
58 | GETJSAMPLE(colormap2[index]) == B) | ||
59 | return; /* color is already in map */ | ||
60 | } | ||
61 | |||
62 | /* Check for map overflow. */ | ||
63 | if (ncolors >= (MAXJSAMPLE+1)) | ||
64 | ERREXIT1(cinfo, JERR_QUANT_MANY_COLORS, (MAXJSAMPLE+1)); | ||
65 | |||
66 | /* OK, add color to map. */ | ||
67 | colormap0[ncolors] = (JSAMPLE) R; | ||
68 | colormap1[ncolors] = (JSAMPLE) G; | ||
69 | colormap2[ncolors] = (JSAMPLE) B; | ||
70 | cinfo->actual_number_of_colors++; | ||
71 | } | ||
72 | |||
73 | |||
74 | /* | ||
75 | * Extract color map from a GIF file. | ||
76 | */ | ||
77 | |||
78 | LOCAL(void) | ||
79 | read_gif_map (j_decompress_ptr cinfo, FILE * infile) | ||
80 | { | ||
81 | int header[13]; | ||
82 | int i, colormaplen; | ||
83 | int R, G, B; | ||
84 | |||
85 | /* Initial 'G' has already been read by read_color_map */ | ||
86 | /* Read the rest of the GIF header and logical screen descriptor */ | ||
87 | for (i = 1; i < 13; i++) { | ||
88 | if ((header[i] = getc(infile)) == EOF) | ||
89 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
90 | } | ||
91 | |||
92 | /* Verify GIF Header */ | ||
93 | if (header[1] != 'I' || header[2] != 'F') | ||
94 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
95 | |||
96 | /* There must be a global color map. */ | ||
97 | if ((header[10] & 0x80) == 0) | ||
98 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
99 | |||
100 | /* OK, fetch it. */ | ||
101 | colormaplen = 2 << (header[10] & 0x07); | ||
102 | |||
103 | for (i = 0; i < colormaplen; i++) { | ||
104 | R = getc(infile); | ||
105 | G = getc(infile); | ||
106 | B = getc(infile); | ||
107 | if (R == EOF || G == EOF || B == EOF) | ||
108 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
109 | add_map_entry(cinfo, | ||
110 | R << (BITS_IN_JSAMPLE-8), | ||
111 | G << (BITS_IN_JSAMPLE-8), | ||
112 | B << (BITS_IN_JSAMPLE-8)); | ||
113 | } | ||
114 | } | ||
115 | |||
116 | |||
117 | /* Support routines for reading PPM */ | ||
118 | |||
119 | |||
120 | LOCAL(int) | ||
121 | pbm_getc (FILE * infile) | ||
122 | /* Read next char, skipping over any comments */ | ||
123 | /* A comment/newline sequence is returned as a newline */ | ||
124 | { | ||
125 | register int ch; | ||
126 | |||
127 | ch = getc(infile); | ||
128 | if (ch == '#') { | ||
129 | do { | ||
130 | ch = getc(infile); | ||
131 | } while (ch != '\n' && ch != EOF); | ||
132 | } | ||
133 | return ch; | ||
134 | } | ||
135 | |||
136 | |||
137 | LOCAL(unsigned int) | ||
138 | read_pbm_integer (j_decompress_ptr cinfo, FILE * infile) | ||
139 | /* Read an unsigned decimal integer from the PPM file */ | ||
140 | /* Swallows one trailing character after the integer */ | ||
141 | /* Note that on a 16-bit-int machine, only values up to 64k can be read. */ | ||
142 | /* This should not be a problem in practice. */ | ||
143 | { | ||
144 | register int ch; | ||
145 | register unsigned int val; | ||
146 | |||
147 | /* Skip any leading whitespace */ | ||
148 | do { | ||
149 | ch = pbm_getc(infile); | ||
150 | if (ch == EOF) | ||
151 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
152 | } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r'); | ||
153 | |||
154 | if (ch < '0' || ch > '9') | ||
155 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
156 | |||
157 | val = ch - '0'; | ||
158 | while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') { | ||
159 | val *= 10; | ||
160 | val += ch - '0'; | ||
161 | } | ||
162 | return val; | ||
163 | } | ||
164 | |||
165 | |||
166 | /* | ||
167 | * Extract color map from a PPM file. | ||
168 | */ | ||
169 | |||
170 | LOCAL(void) | ||
171 | read_ppm_map (j_decompress_ptr cinfo, FILE * infile) | ||
172 | { | ||
173 | int c; | ||
174 | unsigned int w, h, maxval, row, col; | ||
175 | int R, G, B; | ||
176 | |||
177 | /* Initial 'P' has already been read by read_color_map */ | ||
178 | c = getc(infile); /* save format discriminator for a sec */ | ||
179 | |||
180 | /* while we fetch the remaining header info */ | ||
181 | w = read_pbm_integer(cinfo, infile); | ||
182 | h = read_pbm_integer(cinfo, infile); | ||
183 | maxval = read_pbm_integer(cinfo, infile); | ||
184 | |||
185 | if (w <= 0 || h <= 0 || maxval <= 0) /* error check */ | ||
186 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
187 | |||
188 | /* For now, we don't support rescaling from an unusual maxval. */ | ||
189 | if (maxval != (unsigned int) MAXJSAMPLE) | ||
190 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
191 | |||
192 | switch (c) { | ||
193 | case '3': /* it's a text-format PPM file */ | ||
194 | for (row = 0; row < h; row++) { | ||
195 | for (col = 0; col < w; col++) { | ||
196 | R = read_pbm_integer(cinfo, infile); | ||
197 | G = read_pbm_integer(cinfo, infile); | ||
198 | B = read_pbm_integer(cinfo, infile); | ||
199 | add_map_entry(cinfo, R, G, B); | ||
200 | } | ||
201 | } | ||
202 | break; | ||
203 | |||
204 | case '6': /* it's a raw-format PPM file */ | ||
205 | for (row = 0; row < h; row++) { | ||
206 | for (col = 0; col < w; col++) { | ||
207 | R = getc(infile); | ||
208 | G = getc(infile); | ||
209 | B = getc(infile); | ||
210 | if (R == EOF || G == EOF || B == EOF) | ||
211 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
212 | add_map_entry(cinfo, R, G, B); | ||
213 | } | ||
214 | } | ||
215 | break; | ||
216 | |||
217 | default: | ||
218 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
219 | break; | ||
220 | } | ||
221 | } | ||
222 | |||
223 | |||
224 | /* | ||
225 | * Main entry point from djpeg.c. | ||
226 | * Input: opened input file (from file name argument on command line). | ||
227 | * Output: colormap and actual_number_of_colors fields are set in cinfo. | ||
228 | */ | ||
229 | |||
230 | GLOBAL(void) | ||
231 | read_color_map (j_decompress_ptr cinfo, FILE * infile) | ||
232 | { | ||
233 | /* Allocate space for a color map of maximum supported size. */ | ||
234 | cinfo->colormap = (*cinfo->mem->alloc_sarray) | ||
235 | ((j_common_ptr) cinfo, JPOOL_IMAGE, | ||
236 | (JDIMENSION) (MAXJSAMPLE+1), (JDIMENSION) 3); | ||
237 | cinfo->actual_number_of_colors = 0; /* initialize map to empty */ | ||
238 | |||
239 | /* Read first byte to determine file format */ | ||
240 | switch (getc(infile)) { | ||
241 | case 'G': | ||
242 | read_gif_map(cinfo, infile); | ||
243 | break; | ||
244 | case 'P': | ||
245 | read_ppm_map(cinfo, infile); | ||
246 | break; | ||
247 | default: | ||
248 | ERREXIT(cinfo, JERR_BAD_CMAP_FILE); | ||
249 | break; | ||
250 | } | ||
251 | } | ||
252 | |||
253 | #endif /* QUANT_2PASS_SUPPORTED */ | ||