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
|
#include "backend_librsvg.h"
#include "backend.h"
#include "source.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <librsvg/rsvg.h>
/* Some systems like GNU/Hurd don't define PATH_MAX */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
struct private {
void *data;
size_t len;
};
static void source_free(struct imv_source *src)
{
pthread_mutex_lock(&src->busy);
free(src->name);
src->name = NULL;
struct private *private = src->private;
free(private);
src->private = NULL;
pthread_mutex_unlock(&src->busy);
pthread_mutex_destroy(&src->busy);
free(src);
}
static void report_error(struct imv_source *src)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = NULL;
msg.error = "Internal error";
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void send_svg(struct imv_source *src, RsvgHandle *handle)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = imv_image_create_from_svg(handle);
msg.frametime = 0;
msg.error = NULL;
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void *load_image(struct imv_source *src)
{
/* Don't run if this source is already active */
if (pthread_mutex_trylock(&src->busy)) {
return NULL;
}
RsvgHandle *handle = NULL;
GError *error = NULL;
struct private *private = src->private;
if (private->data) {
handle = rsvg_handle_new_from_data(private->data, private->len, &error);
} else {
char path[PATH_MAX+8];
snprintf(path, sizeof path, "file://%s", src->name);
handle = rsvg_handle_new_from_file(path, &error);
}
if (!handle) {
report_error(src);
return NULL;
}
RsvgDimensionData dim;
rsvg_handle_get_dimensions(handle, &dim);
src->width = dim.width;
src->height = dim.height;
send_svg(src, handle);
return NULL;
}
static enum backend_result open_path(const char *path, struct imv_source **src)
{
/* Look for an <SVG> tag near the start of the file */
char header[4096];
FILE *f = fopen(path, "rb");
if (!f) {
return BACKEND_BAD_PATH;
}
fread(header, 1, sizeof header, f);
fclose(f);
header[(sizeof header) - 1] = 0;
if (!strstr(header, "<SVG") && !strstr(header, "<svg")) {
return BACKEND_UNSUPPORTED;
}
struct private *private = malloc(sizeof *private);
private->data = NULL;
private->len = 0;
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup(path);
source->width = 1024;
source->height = 1024;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = private;
*src = source;
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
/* Look for an <SVG> tag near the start of the file */
char header[4096];
size_t header_len = sizeof header;
if (header_len > len) {
header_len = len;
}
memcpy(header, data, header_len);
header[header_len - 1] = 0;
if (!strstr(header, "<SVG") && !strstr(header, "<svg")) {
return BACKEND_UNSUPPORTED;
}
struct private *private = malloc(sizeof *private);
private->data = data;
private->len = len;
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup("-");
source->width = 1024;
source->height = 1024;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = private;
*src = source;
return BACKEND_SUCCESS;
}
const struct imv_backend librsvg_backend = {
.name = "libRSVG",
.description = "SVG library developed by GNOME",
.website = "https://wiki.gnome.org/Projects/LibRsvg",
.license = "Lesser GNU Public License",
.open_path = &open_path,
.open_memory = &open_memory,
};
const struct imv_backend *imv_backend_librsvg(void)
{
return &librsvg_backend;
}
|
