1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* ppmtoterm.c - convert a portable pixmap into an ISO 6429 (ANSI) color ascii
** text.
**
** Copyright (C) 2002 by Ero Carrera (ecarrera@lightforge.com)
** Partially based on,
** ppmtoyuv.c by Marc Boucher,
** ppmtolj.c by Jonathan Melvin and
** ppmtogif.c by Jef Poskanzer
**
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
**
** 14/Aug/2002: First version.
**
*/
#include <stdbool.h>
#include <assert.h>
#include <string.h>
#include "pm_c_util.h"
#include "mallocvar.h"
#include "shhopt.h"
#include "ppm.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileName; /* Name of input file */
unsigned int verbose;
};
static void
parseCommandLine(int argc, const char ** argv,
struct cmdlineInfo * const cmdlineP) {
optEntry * option_def;
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "verbose", OPT_FLAG, NULL, &cmdlineP->verbose, 0);
opt.opt_table = option_def;
opt.short_allowed = false; /* We have no short (old-fashioned) options */
opt.allowNegNum = false; /* We have no parms that are negative numbers */
pm_optParseOptions4(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (argc-1 < 1)
cmdlineP->inputFileName = "-";
else {
cmdlineP->inputFileName = argv[1];
if (argc-1 > 1)
pm_error("Too many arguments: %u. The only possible argument "
"is the input file name", argc-1);
}
}
#define ESC "\x1B\x5B"
#define ANSI_BRIGHT_CMD_PAT ESC "%dm"
#define ANSI_FGCOLOR_CMD_PAT ESC "3%dm"
#define ANSI_BGCOLOR_CMD_PAT ESC "4%dm"
#define MAX_ANSI_STR_LEN 16
#define NUM_COLORS 128
/* 1 bit each RGB = 8 colors.
8 BG colors * 8 FG colors * 2 brightnesses
*/
static void
generatePalette(unsigned char rgb[NUM_COLORS][3],
char ansiCode[NUM_COLORS][MAX_ANSI_STR_LEN],
unsigned int * const paletteSizeP) {
/*----------------------------------------------------------------------------
Generate some sort of color palette mixing the available colors as different
values of background, foreground & brightness.
We return as rgb[I] the RGB triple for the color with palette index I.
Component intensities are in the range 0..255. rgb[I][0] is red;
rgb[I][1] is green; rgb[I][2] is blue.
We return as ansiCode[I] the sequence you send to a terminal to generate
the color with palette index I.
-----------------------------------------------------------------------------*/
unsigned int idx;
/* palette index of the color being considered */
unsigned int bgColorCode;
/* This is the ANSI color code for the background. An ANSI color code
is a 3 bit code in which LSB means red; middle bit means green, and
MSB means blue.
*/
/* We develop the palette backwards: consider every permutation of the
three terminal controls -- background, foreground, and brightness --
and for each figure out what RGB color it represents and fill in
that element of RGB[][]
*/
for (bgColorCode = 0, idx = 0; bgColorCode < 8; ++bgColorCode) {
unsigned int brightness; /* 0 = dim; 1 = bright */
for (brightness = 0; brightness < 2; ++brightness) {
unsigned int fgColorCode;
/* ANSI color code for the foreground. See bgColorCode. */
for (fgColorCode = 0; fgColorCode < 8; ++fgColorCode) {
unsigned int rgbComp;
/* 0 = red; 1 = green; 2 = blue */
for (rgbComp = 0; rgbComp < 3; ++rgbComp) {
assert (idx < NUM_COLORS);
rgb[idx][rgbComp] = 0x00; /* initial value */
if ((fgColorCode & (0x1 << rgbComp)) != 0) {
rgb[idx][rgbComp] |= 0xC0;
if (brightness == 1)
rgb[idx][rgbComp] |= 0x3F;
}
if ((bgColorCode & (0x1 << rgbComp)) != 0)
rgb[idx][rgbComp] |= 0x80;
}
sprintf(ansiCode[idx],
ANSI_BRIGHT_CMD_PAT
ANSI_FGCOLOR_CMD_PAT
ANSI_BGCOLOR_CMD_PAT,
brightness, fgColorCode, bgColorCode);
++idx;
}
}
}
*paletteSizeP = idx;
}
static void
lookupInPalette(pixel const pixel,
pixval const maxval,
unsigned char rgb[NUM_COLORS][3],
unsigned int const palLen,
unsigned int * const paletteIdxP) {
/*----------------------------------------------------------------------------
Look up the color 'pixel' (which has maxval 'maxval') in the palette
palette[], which has 'palLen' elements and uses maxval 255. Return the
index into palette[] of the color that is closes to 'pixel' as
*paletteIdxP.
-----------------------------------------------------------------------------*/
pixval const r = PPM_GETR(pixel) * 255 / maxval;
pixval const g = PPM_GETG(pixel) * 255 / maxval;
pixval const b = PPM_GETB(pixel) * 255 / maxval;
unsigned int paletteIdxSoFar;
unsigned int dist;
unsigned int i;
/* The following loop calculates the index that corresponds to the
minimum color distance between the given RGB values and the
values available in the palette.
*/
for (i = 0, dist = SQR(255)*3, paletteIdxSoFar = 0; i < palLen; ++i) {
pixval const pr=rgb[i][0];
pixval const pg=rgb[i][1];
pixval const pb=rgb[i][2];
unsigned int const j = SQR(r-pr) + SQR(b-pb) + SQR(g-pg);
if (j < dist) {
dist = j;
paletteIdxSoFar = i;
}
}
*paletteIdxP = paletteIdxSoFar;
}
int
main(int argc, const char ** argv) {
FILE * ifP;
pixel ** pixels;
int rows, cols;
unsigned int row;
unsigned int palLen;
pixval maxval;
struct cmdlineInfo cmdline;
unsigned char rgb[NUM_COLORS][3];
char ansiCode[NUM_COLORS][MAX_ANSI_STR_LEN];
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
pixels = ppm_readppm(ifP, &cols, &rows, &maxval);
pm_close(ifP);
generatePalette(rgb, ansiCode, &palLen);
for (row = 0; row < rows; ++row) {
unsigned int col;
for (col = 0; col < cols; ++col) {
unsigned int paletteIdx;
lookupInPalette(pixels[row][col], maxval, rgb, palLen,
&paletteIdx);
printf("%s\xB1", ansiCode[paletteIdx]);
}
printf(ESC "\x30m\n");
}
printf(ESC "\x30m");
ppm_freearray(pixels, rows);
return 0;
}
|
