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
|
/*
* PDF cleaning tool: general purpose pdf syntax washer.
*
* Rewrite PDF with pretty printed objects.
* Garbage collect unreachable objects.
* Inflate compressed streams.
* Create subset documents.
*
* TODO: linearize document for fast web view
*/
#include "fitz.h"
#include "mupdf-internal.h"
static int x_factor = 0;
static int y_factor = 0;
static void usage(void)
{
fprintf(stderr,
"usage: mutool poster [options] input.pdf [output.pdf]\n"
"\t-p -\tpassword\n"
"\t-x\tx decimation factor\n"
"\t-y\ty decimation factor\n");
exit(1);
}
/*
* Recreate page tree to only retain specified pages.
*/
static void decimatepages(pdf_document *xref)
{
pdf_obj *oldroot, *root, *pages, *kids, *parent;
fz_context *ctx = xref->ctx;
int num_pages = pdf_count_pages(xref);
int page, kidcount;
/* Keep only pages/type and (reduced) dest entries to avoid
* references to unretained pages */
oldroot = pdf_dict_gets(xref->trailer, "Root");
pages = pdf_dict_gets(oldroot, "Pages");
root = pdf_new_dict(ctx, 2);
pdf_dict_puts(root, "Type", pdf_dict_gets(oldroot, "Type"));
pdf_dict_puts(root, "Pages", pdf_dict_gets(oldroot, "Pages"));
pdf_update_object(xref, pdf_to_num(oldroot), root);
pdf_drop_obj(root);
/* Create a new kids array with only the pages we want to keep */
parent = pdf_new_indirect(ctx, pdf_to_num(pages), pdf_to_gen(pages), xref);
kids = pdf_new_array(ctx, 1);
kidcount = 0;
for (page=0; page < num_pages; page++)
{
pdf_page *page_details = pdf_load_page(xref, page);
int xf = x_factor, yf = y_factor;
int x, y;
float w = page_details->mediabox.x1 - page_details->mediabox.x0;
float h = page_details->mediabox.y1 - page_details->mediabox.y0;
if (xf == 0 && yf == 0)
{
/* Nothing specified, so split along the long edge */
if (w > h)
xf = 2, yf = 1;
else
xf = 1, yf = 2;
}
else if (xf == 0)
xf = 1;
else if (yf == 0)
yf = 1;
for (y = yf-1; y >= 0; y--)
{
for (x = 0; x < xf; x++)
{
pdf_obj *newpageobj, *newpageref, *newmediabox;
fz_rect mb;
int num;
newpageobj = pdf_copy_dict(ctx, xref->page_objs[page]);
num = pdf_create_object(xref);
pdf_update_object(xref, num, newpageobj);
newpageref = pdf_new_indirect(ctx, num, 0, xref);
newmediabox = pdf_new_array(ctx, 4);
mb.x0 = page_details->mediabox.x0 + (w/xf)*x;
if (x == xf-1)
mb.x1 = page_details->mediabox.x1;
else
mb.x1 = page_details->mediabox.x0 + (w/xf)*(x+1);
mb.y0 = page_details->mediabox.y0 + (h/yf)*y;
if (y == yf-1)
mb.y1 = page_details->mediabox.y1;
else
mb.y1 = page_details->mediabox.y0 + (h/yf)*(y+1);
pdf_array_push(newmediabox, pdf_new_real(ctx, mb.x0));
pdf_array_push(newmediabox, pdf_new_real(ctx, mb.y0));
pdf_array_push(newmediabox, pdf_new_real(ctx, mb.x1));
pdf_array_push(newmediabox, pdf_new_real(ctx, mb.y1));
pdf_dict_puts(newpageobj, "Parent", parent);
pdf_dict_puts(newpageobj, "MediaBox", newmediabox);
/* Store page object in new kids array */
pdf_array_push(kids, newpageref);
kidcount++;
}
}
}
pdf_drop_obj(parent);
/* Update page count and kids array */
pdf_dict_puts(pages, "Count", pdf_new_int(ctx, kidcount));
pdf_dict_puts(pages, "Kids", kids);
pdf_drop_obj(kids);
}
int pdfposter_main(int argc, char **argv)
{
char *infile;
char *outfile = "out.pdf";
char *password = "";
int c;
fz_write_options opts;
pdf_document *xref;
fz_context *ctx;
opts.do_garbage = 0;
opts.do_expand = 0;
opts.do_ascii = 0;
while ((c = fz_getopt(argc, argv, "x:y:")) != -1)
{
switch (c)
{
case 'p': password = fz_optarg; break;
case 'x': x_factor = atoi(fz_optarg); break;
case 'y': y_factor = atoi(fz_optarg); break;
default: usage(); break;
}
}
if (argc - fz_optind < 1)
usage();
infile = argv[fz_optind++];
if (argc - fz_optind > 0 &&
(strstr(argv[fz_optind], ".pdf") || strstr(argv[fz_optind], ".PDF")))
{
outfile = argv[fz_optind++];
}
ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
if (!ctx)
{
fprintf(stderr, "cannot initialise context\n");
exit(1);
}
xref = pdf_open_document_no_run(ctx, infile);
if (pdf_needs_password(xref))
if (!pdf_authenticate_password(xref, password))
fz_throw(ctx, "cannot authenticate password: %s", infile);
/* Only retain the specified subset of the pages */
decimatepages(xref);
pdf_write_document(xref, outfile, &opts);
pdf_close_document(xref);
fz_free_context(ctx);
return 0;
}
|
