ReactOS 0.4.15-dev-8408-g466a198
rdcolmap.c
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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
45LOCAL(void)
46add_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;
71}
72
73
74/*
75 * Extract color map from a GIF file.
76 */
77
78LOCAL(void)
79read_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
120LOCAL(int)
121pbm_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
137LOCAL(unsigned int)
138read_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
170LOCAL(void)
171read_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
230GLOBAL(void)
231read_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 */
#define index(s, c)
Definition: various.h:29
#define G(r, i, a, b, c, d)
Definition: blake2b-ref.c:117
Definition: ehthrow.cxx:54
#define B(row, col)
struct png_info_def *typedef unsigned char **typedef struct png_info_def *typedef struct png_info_def *typedef struct png_info_def *typedef unsigned char ** row
Definition: typeof.h:78
const GLubyte * c
Definition: glext.h:8905
GLuint index
Definition: glext.h:6031
GLuint GLfloat * val
Definition: glext.h:7180
GLubyte GLubyte GLubyte GLubyte w
Definition: glext.h:6102
GLfloat GLfloat GLfloat GLfloat h
Definition: glext.h:7723
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
_Check_return_ _CRTIMP int __cdecl getc(_Inout_ FILE *_File)
#define EOF
Definition: stdio.h:24
#define ERREXIT1(cinfo, code, p1)
Definition: jerror.h:212
unsigned int JDIMENSION
Definition: jmorecfg.h:229
#define MAXJSAMPLE
Definition: jmorecfg.h:83
char JSAMPLE
Definition: jmorecfg.h:74
#define LOCAL(type)
Definition: jmorecfg.h:289
#define BITS_IN_JSAMPLE
Definition: jmorecfg.h:33
#define GLOBAL(type)
Definition: jmorecfg.h:291
#define GETJSAMPLE(value)
Definition: jmorecfg.h:78
JSAMPLE FAR * JSAMPROW
Definition: jpeglib.h:75
#define JPOOL_IMAGE
Definition: jpeglib.h:808
#define c
Definition: ke_i.h:80
#define ERREXIT(msg)
Definition: rdjpgcom.c:72
static FILE * infile
Definition: rdjpgcom.c:65
#define R(b, x)
Definition: sha2.c:134
JSAMPARRAY colormap
Definition: jpeglib.h:527