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
// Take a look at the license at the top of the repository in the LICENSE file.

use std::time::{Duration, SystemTime};

use glib::translate::*;

use super::Pixbuf;

glib::wrapper! {
    /// An opaque object representing an iterator which points to a
    /// certain position in an animation.
    #[doc(alias = "GdkPixbufAnimationIter")]
    pub struct PixbufAnimationIter(Object<ffi::GdkPixbufAnimationIter, ffi::GdkPixbufAnimationIterClass>);

    match fn {
        type_ => || ffi::gdk_pixbuf_animation_iter_get_type(),
    }
}

impl PixbufAnimationIter {
    /// Possibly advances an animation to a new frame.
    ///
    /// Chooses the frame based on the start time passed to
    /// gdk_pixbuf_animation_get_iter().
    ///
    /// @current_time would normally come from g_get_current_time(), and
    /// must be greater than or equal to the time passed to
    /// gdk_pixbuf_animation_get_iter(), and must increase or remain
    /// unchanged each time gdk_pixbuf_animation_iter_get_pixbuf() is
    /// called. That is, you can't go backward in time; animations only
    /// play forward.
    ///
    /// As a shortcut, pass `NULL` for the current time and g_get_current_time()
    /// will be invoked on your behalf. So you only need to explicitly pass
    /// @current_time if you're doing something odd like playing the animation
    /// at double speed.
    ///
    /// If this function returns `FALSE`, there's no need to update the animation
    /// display, assuming the display had been rendered prior to advancing;
    /// if `TRUE`, you need to call gdk_pixbuf_animation_iter_get_pixbuf()
    /// and update the display with the new pixbuf.
    /// ## `current_time`
    /// current time
    ///
    /// # Returns
    ///
    /// `TRUE` if the image may need updating
    #[doc(alias = "gdk_pixbuf_animation_iter_advance")]
    pub fn advance(&self, current_time: SystemTime) -> bool {
        let diff = current_time
            .duration_since(SystemTime::UNIX_EPOCH)
            .expect("failed to convert time");

        unsafe {
            from_glib(ffi::gdk_pixbuf_animation_iter_advance(
                self.to_glib_none().0,
                &glib::ffi::GTimeVal {
                    tv_sec: diff.as_secs() as _,
                    tv_usec: diff.subsec_micros() as _,
                },
            ))
        }
    }

    /// Gets the current pixbuf which should be displayed.
    ///
    /// The pixbuf might not be the same size as the animation itself
    /// (gdk_pixbuf_animation_get_width(), gdk_pixbuf_animation_get_height()).
    ///
    /// This pixbuf should be displayed for gdk_pixbuf_animation_iter_get_delay_time()
    /// milliseconds.
    ///
    /// The caller of this function does not own a reference to the returned
    /// pixbuf; the returned pixbuf will become invalid when the iterator
    /// advances to the next frame, which may happen anytime you call
    /// gdk_pixbuf_animation_iter_advance().
    ///
    /// Copy the pixbuf to keep it (don't just add a reference), as it may get
    /// recycled as you advance the iterator.
    ///
    /// # Returns
    ///
    /// the pixbuf to be displayed
    #[doc(alias = "gdk_pixbuf_animation_iter_get_pixbuf")]
    #[doc(alias = "get_pixbuf")]
    pub fn pixbuf(&self) -> Pixbuf {
        unsafe {
            from_glib_none(ffi::gdk_pixbuf_animation_iter_get_pixbuf(
                self.to_glib_none().0,
            ))
        }
    }

    /// Gets the number of milliseconds the current pixbuf should be displayed,
    /// or -1 if the current pixbuf should be displayed forever.
    ///
    /// The `g_timeout_add()` function conveniently takes a timeout in milliseconds,
    /// so you can use a timeout to schedule the next update.
    ///
    /// Note that some formats, like GIF, might clamp the timeout values in the
    /// image file to avoid updates that are just too quick. The minimum timeout
    /// for GIF images is currently 20 milliseconds.
    ///
    /// # Returns
    ///
    /// delay time in milliseconds (thousandths of a second)
    #[doc(alias = "gdk_pixbuf_animation_iter_get_delay_time")]
    #[doc(alias = "get_delay_time")]
    pub fn delay_time(&self) -> Option<Duration> {
        unsafe {
            let res = ffi::gdk_pixbuf_animation_iter_get_delay_time(self.to_glib_none().0);

            if res < 0 {
                None
            } else {
                Some(Duration::from_millis(res as u64))
            }
        }
    }

    /// Used to determine how to respond to the area_updated signal on
    /// #GdkPixbufLoader when loading an animation.
    ///
    /// The `::area_updated` signal is emitted for an area of the frame currently
    /// streaming in to the loader. So if you're on the currently loading frame,
    /// you will need to redraw the screen for the updated area.
    ///
    /// # Returns
    ///
    /// `TRUE` if the frame we're on is partially loaded, or the last frame
    #[doc(alias = "gdk_pixbuf_animation_iter_on_currently_loading_frame")]
    pub fn on_currently_loading_frame(&self) -> bool {
        unsafe {
            from_glib(ffi::gdk_pixbuf_animation_iter_on_currently_loading_frame(
                self.to_glib_none().0,
            ))
        }
    }
}