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
|
/* +-------------------------------------------------------------------+ */
/* | This file is derived from | */
/* | Xpaint's readJPEG routines, copyrighted | */
/* | by David Koblas (koblas@netcom.com) | */
/* | | */
/* | Permission to use, copy, modify, and to distribute this software | */
/* | and its documentation for any purpose is hereby granted without | */
/* | fee, provided that the above copyright notice appear in all | */
/* | copies and that both that copyright notice and this permission | */
/* | notice appear in supporting documentation. There is no | */
/* | representations about the suitability of this software for | */
/* | any purpose. this software is provided "as is" without express | */
/* | or implied warranty. | */
/* | | */
/* +-------------------------------------------------------------------+ */
#include <stdio.h>
#include <setjmp.h>
#include <stdlib.h>
#include <jpeglib.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "sunclock.h"
extern Display * dpy;
extern Visual * visual;
extern Colormap tmp_cmap;
extern int scr;
extern int bigendian;
extern int color_depth;
extern int color_pad;
extern int bytes_per_pixel;
extern int color_alloc_failed;
extern int verbose;
#define RANGE 252
extern long lr[RANGE], lg[RANGE], lb[RANGE], lnum[RANGE];
extern char * salloc(register int);
extern void fill_line(char *scan, char* c, int w, int zw, int wp, int dx);
struct error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* for return to caller */
};
typedef struct error_mgr * error_ptr;
void
error_exit (j_common_ptr cinfo)
{
/* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
error_ptr err = (error_ptr) cinfo->err;
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
longjmp(err->setjmp_buffer, 1);
}
int
readJPEG(char *path, Sundata * Context)
{
struct jpeg_decompress_struct cinfo;
struct error_mgr jerr;
FILE *input_file;
double ratio;
int i, k, l, m, prev, next, size;
JSAMPROW scanline[1];
char *scan, *c;
char pix[RANGE];
XColor xc;
if ((input_file = fopen(path, "r")) == NULL) return 1;
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = error_exit;
if (setjmp(jerr.setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file,
* and return.
*/
jpeg_destroy_decompress(&cinfo);
fclose(input_file);
Context->xim = 0;
return 2;
}
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, input_file);
jpeg_read_header(&cinfo, TRUE);
if (cinfo.jpeg_color_space == JCS_GRAYSCALE) return 3;
ratio = ((double) cinfo.image_width/(double) Context->zoom.width +
(double) cinfo.image_height/(double) Context->zoom.height )/1.8;
if (ratio>=8.0)
cinfo.scale_denom = 8;
else
if (ratio>=4.0)
cinfo.scale_denom = 4;
else
if (ratio>=2.0)
cinfo.scale_denom = 2;
else
cinfo.scale_denom = 1;
jpeg_start_decompress(&cinfo);
Context->xim = XCreateImage(dpy, visual,
DefaultDepth(dpy, scr), ZPixmap, 0, NULL,
Context->geom.width, Context->geom.height, color_pad, 0);
XFlush(dpy);
if (!Context->xim) return 4;
bytes_per_pixel = (Context->xim->bits_per_pixel/8);
size = Context->xim->bytes_per_line * Context->geom.height;
Context->xim->data = (char *) salloc(size);
scan = (char *) salloc(3 * cinfo.output_width * sizeof(char));
if (verbose)
fprintf(stderr, "Loading %s\n"
"Rescaling JPEG data by 1/%d, "
"%d %d --> %d %d, %d bytes per pixel\n",
path, cinfo.scale_denom,
cinfo.image_width, cinfo.image_height,
Context->geom.width, Context->geom.height,
bytes_per_pixel);
prev = -1;
scanline[0] = (JSAMPROW) scan;
if (color_depth<=8)
for (l=0; l<RANGE; l++) {
lr[l] = lg[l] = lb[l] = lnum[l] = 0;
}
while (cinfo.output_scanline < cinfo.output_height) {
(void) jpeg_read_scanlines(&cinfo, scanline, (JDIMENSION) 1);
next = ((2*cinfo.output_scanline - 1) * Context->zoom.height)/
(2*(int)cinfo.output_height) - Context->zoom.dy;
if (next>=0) {
if (next>=Context->geom.height) {
next = Context->geom.height - 1;
/* get loop to stop at next iteration ! */
cinfo.output_scanline = cinfo.output_height;
}
for (l = prev+1; l<= next; l++) {
c = Context->xim->data + l * Context->xim->bytes_per_line;
fill_line(scan, c, Context->geom.width, Context->zoom.width,
cinfo.output_width, Context->zoom.dx);
}
prev = next;
}
}
free(scan);
jpeg_destroy_decompress(&cinfo);
fclose(input_file);
if (jerr.pub.num_warnings > 0) {
longjmp(jerr.setjmp_buffer, 1);
}
if (color_depth<=8) {
xc.flags = DoRed | DoGreen | DoBlue;
k = 0;
for (m=0; m<RANGE; m++) if (lnum[m]) {
xc.red = (lr[m]/lnum[m])*257;
xc.green = (lg[m]/lnum[m])*257;
xc.blue = (lb[m]/lnum[m])*257;
if (!XAllocColor(dpy, tmp_cmap, &xc))
color_alloc_failed = 1;
pix[m] = (char) xc.pixel;
Context->daypixel[k] = (unsigned char) xc.pixel;
++k;
}
Context->ncolors = k;
for (i=0; i<size; i++)
Context->xim->data[i] = pix[(unsigned char)Context->xim->data[i]];
}
return 0;
}
int
testJPEG(char *file)
{
unsigned char buf[2];
FILE *fd = fopen(file, "r");
int ret = 0;
if (fd == NULL)
return 0;
if (2 == fread(buf, sizeof(char), 2, fd)) {
if (buf[0] == 0xff && buf[1] == 0xd8)
ret = 1;
}
fclose(fd);
return ret;
}
|
