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
|
#include "image.h"
#include <gtk-3.0/gtk/gtk.h>
GtkWidget *new_image()
{
image = gtk_image_new();
return image;
}
int load_image(char *file_name, int win_width, int win_height)
{
printf("loading: %s\n", file_name);
GError *error = NULL;
if (pixbuf != NULL)
g_object_unref(pixbuf);
pixbuf = gdk_pixbuf_new_from_file(file_name, &error);
if (error)
return -1;
curr_pixbuf_width = pixbuf_width = gdk_pixbuf_get_width(GDK_PIXBUF(pixbuf));
curr_pixbuf_height = pixbuf_height =
gdk_pixbuf_get_height(GDK_PIXBUF(pixbuf));
aspect_ratio = (double)pixbuf_width / (double)pixbuf_height;
curr_zoom = 1.0;
fit_image(win_width, win_height);
return 1;
}
void update_pixbuf()
{
if (curr_pixbuf != NULL)
g_object_unref(curr_pixbuf);
if (pixbuf == NULL)
return;
curr_pixbuf =
gdk_pixbuf_scale_simple(GDK_PIXBUF(pixbuf), curr_pixbuf_width,
curr_pixbuf_height, GDK_INTERP_BILINEAR);
gtk_image_set_from_pixbuf(GTK_IMAGE(image), GDK_PIXBUF(curr_pixbuf));
}
void fit_image(int win_width, int win_height)
{
if (pixbuf == NULL || win_width < 1 || win_height < 1)
return;
if (win_width < pixbuf_width && win_height > pixbuf_height) {
curr_pixbuf_width = win_width;
curr_pixbuf_height = (double)curr_pixbuf_width / aspect_ratio;
} else if (win_width > pixbuf_width && win_height < pixbuf_height) {
curr_pixbuf_height = win_height;
curr_pixbuf_width = (double)curr_pixbuf_height * aspect_ratio;
} else if (win_width < pixbuf_width && win_height < pixbuf_height) {
if (((double)win_width / (double)win_height) > aspect_ratio) {
curr_pixbuf_height = win_height;
curr_pixbuf_width = ((double)curr_pixbuf_height * aspect_ratio);
} else {
curr_pixbuf_width = win_width;
curr_pixbuf_height = (double)curr_pixbuf_width / aspect_ratio;
}
} else {
curr_pixbuf_width = pixbuf_width;
curr_pixbuf_height = pixbuf_height;
}
curr_zoom = (double)curr_pixbuf_width / (double)pixbuf_width;
if (curr_pixbuf_width < 1 || curr_pixbuf_height < 1)
return;
update_pixbuf();
}
void zoom(int type)
{
if (pixbuf == NULL)
return;
if (type == 0) {
if (curr_zoom == 1.0)
return;
curr_zoom = 1.0;
} else if (type < 0) {
if (curr_zoom < 0.2)
return;
curr_zoom -= 0.1;
} else if (type > 0) {
if (curr_zoom > 2)
return;
curr_zoom += 0.1;
}
curr_pixbuf_width = curr_zoom * (double)pixbuf_width;
curr_pixbuf_height = curr_zoom * (double)pixbuf_height;
update_pixbuf();
}
void print_supported_formats()
{
GSList *list, *it;
GdkPixbufFormat *format;
gchar **extensions;
gchar *ex;
list = gdk_pixbuf_get_formats();
if (list != NULL) {
for (it = list; it->next != NULL; it = it->next) {
format = (GdkPixbufFormat *)it->data;
printf("%s:", gdk_pixbuf_format_get_description(format));
extensions = gdk_pixbuf_format_get_extensions(format);
for (ex = *extensions; *ex; ex++) {
printf(" %s", ex);
}
printf("\n");
}
g_slist_free(list);
}
}
|
