]>
Commit | Line | Data |
---|---|---|
ac884b6a MS |
1 | /* |
2 | * "$Id$" | |
3 | * | |
4 | * Dither test program for ESP Print Pro. | |
5 | * | |
6 | * Try the following: | |
7 | * | |
8 | * testdither 0 255 > filename.ppm | |
9 | * testdither 0 127 255 > filename.ppm | |
10 | * testdither 0 85 170 255 > filename.ppm | |
11 | * testdither 0 63 127 170 198 227 255 > filename.ppm | |
12 | * testdither 0 210 383 > filename.ppm | |
13 | * testdither 0 82 255 > filename.ppm | |
14 | * | |
15 | * Copyright 2007 by Apple Inc. | |
16 | * Copyright 1993-2005 by Easy Software Products. | |
17 | * | |
18 | * These coded instructions, statements, and computer programs are the | |
19 | * property of Apple Inc. and are protected by Federal copyright | |
20 | * law. Distribution and use rights are outlined in the file "LICENSE.txt" | |
21 | * which should have been included with this file. If this file is | |
22 | * file is missing or damaged, see the license at "http://www.cups.org/". | |
23 | * | |
24 | * Contents: | |
25 | * | |
26 | * main() - Test dithering and output a PPM file. | |
27 | * usage() - Show program usage... | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Include necessary headers. | |
32 | */ | |
33 | ||
34 | #include "driver.h" | |
35 | #include <cups/string.h> | |
36 | ||
37 | ||
38 | /* | |
39 | * Local functions... | |
40 | */ | |
41 | ||
42 | void usage(void); | |
43 | ||
44 | ||
45 | /* | |
46 | * 'main()' - Test dithering and output a PPM file. | |
47 | */ | |
48 | ||
49 | int /* O - Exit status */ | |
50 | main(int argc, /* I - Number of command-line arguments */ | |
51 | char *argv[]) /* I - Command-line arguments */ | |
52 | { | |
53 | int x, y; /* Current coordinate in image */ | |
54 | short line[512]; /* Line to dither */ | |
55 | unsigned char pixels[512], /* Dither pixels */ | |
56 | *pixptr; /* Pointer in line */ | |
57 | int output; /* Output pixel */ | |
58 | cups_lut_t *lut; /* Dither lookup table */ | |
59 | cups_dither_t *dither; /* Dither state */ | |
60 | int nlutvals; /* Number of lookup values */ | |
61 | float lutvals[16]; /* Lookup values */ | |
62 | int pixvals[16]; /* Pixel values */ | |
63 | ||
64 | ||
65 | /* | |
66 | * See if we have lookup table values on the command-line... | |
67 | */ | |
68 | ||
69 | if (argc > 1) | |
70 | { | |
71 | /* | |
72 | * Yes, collect them... | |
73 | */ | |
74 | ||
75 | nlutvals = 0; | |
76 | ||
77 | for (x = 1; x < argc; x ++) | |
78 | if (isdigit(argv[x][0]) && nlutvals < 16) | |
79 | { | |
80 | pixvals[nlutvals] = atoi(argv[x]); | |
81 | lutvals[nlutvals] = atof(argv[x]) / 255.0; | |
82 | nlutvals ++; | |
83 | } | |
84 | else | |
85 | usage(); | |
86 | ||
87 | /* | |
88 | * See if we have at least 2 values... | |
89 | */ | |
90 | ||
91 | if (nlutvals < 2) | |
92 | usage(); | |
93 | } | |
94 | else | |
95 | { | |
96 | /* | |
97 | * Otherwise use the default 2-entry LUT with values of 0 and 255... | |
98 | */ | |
99 | ||
100 | nlutvals = 2; | |
101 | lutvals[0] = 0.0; | |
102 | lutvals[1] = 1.0; | |
103 | pixvals[0] = 0; | |
104 | pixvals[1] = 255; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Create the lookup table and dither state... | |
109 | */ | |
110 | ||
111 | lut = cupsLutNew(nlutvals, lutvals); | |
112 | dither = cupsDitherNew(512); | |
113 | ||
114 | /* | |
115 | * Put out the PGM header for a raw 256x256x8-bit grayscale file... | |
116 | */ | |
117 | ||
118 | puts("P5\n512\n512\n255"); | |
119 | ||
120 | /* | |
121 | * Dither 512 lines, which are written out in 256 image lines... | |
122 | */ | |
123 | ||
124 | for (y = 0; y < 512; y ++) | |
125 | { | |
126 | /* | |
127 | * Create the grayscale data for the current line... | |
128 | */ | |
129 | ||
130 | for (x = 0; x < 512; x ++) | |
131 | line[x] = 4095 * ((y / 32) * 16 + x / 32) / 255; | |
132 | ||
133 | /* | |
134 | * Dither the line... | |
135 | */ | |
136 | ||
137 | cupsDitherLine(dither, lut, line, 1, pixels); | |
138 | ||
139 | if (y == 0) | |
140 | { | |
141 | fputs("DEBUG: pixels =", stderr); | |
142 | for (x = 0; x < 512; x ++) | |
143 | fprintf(stderr, " %d", pixels[x]); | |
144 | fputs("\n", stderr); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Add or set the output pixel values... | |
149 | */ | |
150 | ||
151 | for (x = 0, pixptr = pixels; x < 512; x ++, pixptr ++) | |
152 | { | |
153 | output = 255 - pixvals[*pixptr]; | |
154 | ||
155 | if (output < 0) | |
156 | putchar(0); | |
157 | else | |
158 | putchar(output); | |
159 | } | |
160 | } | |
161 | ||
162 | /* | |
163 | * Free the dither state and lookup table... | |
164 | */ | |
165 | ||
166 | cupsDitherDelete(dither); | |
167 | cupsLutDelete(lut); | |
168 | ||
169 | /* | |
170 | * Return with no errors... | |
171 | */ | |
172 | ||
173 | return (0); | |
174 | } | |
175 | ||
176 | ||
177 | /* | |
178 | * 'usage()' - Show program usage... | |
179 | */ | |
180 | ||
181 | void | |
182 | usage(void) | |
183 | { | |
184 | puts("Usage: testdither [val1 val2 [... val16]] >filename.ppm"); | |
185 | exit(1); | |
186 | } | |
187 | ||
188 | ||
189 | /* | |
190 | * End of "$Id$". | |
191 | */ |