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
236
237
238
239
240
|
#include "mupdf/fitz.h"
#include <string.h>
#define DPI 72.0f
typedef struct img_document_s img_document;
typedef struct img_page_s img_page;
struct img_page_s
{
fz_page super;
fz_image *image;
};
struct img_document_s
{
fz_document super;
fz_buffer *buffer;
const char *format;
int page_count;
fz_pixmap *(*load_subimage)(fz_context *ctx, const unsigned char *p, size_t total, int subimage);
};
static void
img_drop_document(fz_context *ctx, fz_document *doc_)
{
img_document *doc = (img_document*)doc_;
fz_drop_buffer(ctx, doc->buffer);
}
static int
img_count_pages(fz_context *ctx, fz_document *doc_)
{
img_document *doc = (img_document*)doc_;
return doc->page_count;
}
static fz_rect
img_bound_page(fz_context *ctx, fz_page *page_)
{
img_page *page = (img_page*)page_;
fz_image *image = page->image;
int xres, yres;
fz_rect bbox;
fz_image_resolution(image, &xres, &yres);
bbox.x0 = bbox.y0 = 0;
bbox.x1 = image->w * DPI / xres;
bbox.y1 = image->h * DPI / yres;
return bbox;
}
static void
img_run_page(fz_context *ctx, fz_page *page_, fz_device *dev, fz_matrix ctm, fz_cookie *cookie)
{
img_page *page = (img_page*)page_;
fz_image *image = page->image;
int xres, yres;
float w, h;
fz_image_resolution(image, &xres, &yres);
w = image->w * DPI / xres;
h = image->h * DPI / yres;
ctm = fz_pre_scale(ctm, w, h);
fz_fill_image(ctx, dev, image, ctm, 1, NULL);
}
static void
img_drop_page(fz_context *ctx, fz_page *page_)
{
img_page *page = (img_page*)page_;
fz_drop_image(ctx, page->image);
}
static fz_page *
img_load_page(fz_context *ctx, fz_document *doc_, int number)
{
img_document *doc = (img_document*)doc_;
fz_pixmap *pixmap = NULL;
fz_image *image = NULL;
img_page *page = NULL;
if (number < 0 || number >= doc->page_count)
return NULL;
fz_var(pixmap);
fz_var(image);
fz_var(page);
fz_try(ctx)
{
if (doc->load_subimage)
{
size_t len;
unsigned char *data;
len = fz_buffer_storage(ctx, doc->buffer, &data);
pixmap = doc->load_subimage(ctx, data, len, number);
image = fz_new_image_from_pixmap(ctx, pixmap, NULL);
}
else
{
image = fz_new_image_from_buffer(ctx, doc->buffer);
}
page = fz_new_derived_page(ctx, img_page);
page->super.bound_page = img_bound_page;
page->super.run_page_contents = img_run_page;
page->super.drop_page = img_drop_page;
page->image = fz_keep_image(ctx, image);
}
fz_always(ctx)
{
fz_drop_image(ctx, image);
fz_drop_pixmap(ctx, pixmap);
}
fz_catch(ctx)
{
fz_free(ctx, page);
fz_rethrow(ctx);
}
return (fz_page*)page;
}
static int
img_lookup_metadata(fz_context *ctx, fz_document *doc_, const char *key, char *buf, int size)
{
img_document *doc = (img_document*)doc_;
if (!strcmp(key, "format"))
return (int)fz_strlcpy(buf, doc->format, size);
return -1;
}
static fz_document *
img_open_document_with_stream(fz_context *ctx, fz_stream *file)
{
img_document *doc = NULL;
doc = fz_new_derived_document(ctx, img_document);
doc->super.drop_document = img_drop_document;
doc->super.count_pages = img_count_pages;
doc->super.load_page = img_load_page;
doc->super.lookup_metadata = img_lookup_metadata;
fz_try(ctx)
{
int fmt;
size_t len;
unsigned char *data;
doc->buffer = fz_read_all(ctx, file, 1024);
len = fz_buffer_storage(ctx, doc->buffer, &data);
fmt = FZ_IMAGE_UNKNOWN;
if (len >= 8)
fmt = fz_recognize_image_format(ctx, data);
if (fmt == FZ_IMAGE_TIFF)
{
doc->page_count = fz_load_tiff_subimage_count(ctx, data, len);
doc->load_subimage = fz_load_tiff_subimage;
doc->format = "TIFF";
}
else if (fmt == FZ_IMAGE_PNM)
{
doc->page_count = fz_load_pnm_subimage_count(ctx, data, len);
doc->load_subimage = fz_load_pnm_subimage;
doc->format = "PNM";
}
else
{
doc->page_count = 1;
doc->format = "Image";
}
}
fz_catch(ctx)
{
fz_drop_document(ctx, (fz_document*)doc);
fz_rethrow(ctx);
}
return (fz_document*)doc;
}
static const char *img_extensions[] =
{
"bmp",
"gif",
"hdp",
"j2k",
"jfif",
"jfif-tbnl",
"jp2",
"jpe",
"jpeg",
"jpg",
"jpx",
"jxr",
"pam",
"pbm",
"pgm",
"png",
"pnm",
"ppm",
"tif",
"tiff",
"wdp",
NULL
};
static const char *img_mimetypes[] =
{
"image/bmp",
"image/gif",
"image/jp2",
"image/jpeg",
"image/jpx",
"image/jxr",
"image/pjpeg",
"image/png",
"image/tiff",
"image/vnd.ms-photo",
"image/x-portable-anymap",
"image/x-portable-arbitrarymap",
"image/x-portable-bitmap",
"image/x-portable-greymap",
"image/x-portable-pixmap",
"image/x-tiff",
NULL
};
fz_document_handler img_document_handler =
{
NULL,
NULL,
img_open_document_with_stream,
img_extensions,
img_mimetypes
};
|
