The gdk-pixbuf library provides a simple mechanism to load and represent animations.
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| PixbufAnimation (PixbufAnimation&& src) noexcept |
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PixbufAnimation& | operator= (PixbufAnimation&& src) noexcept |
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| ~PixbufAnimation () noexcept override |
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GdkPixbufAnimation* | gobj () |
| Provides access to the underlying C GObject. More...
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const GdkPixbufAnimation* | gobj () const |
| Provides access to the underlying C GObject. More...
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GdkPixbufAnimation* | gobj_copy () |
| Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
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int | get_width () const |
| Queries the width of the bounding box of a pixbuf animation. More...
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int | get_height () const |
| Queries the height of the bounding box of a pixbuf animation. More...
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bool | is_static_image () const |
| If you load a file with new_from_file() and it turns out to be a plain, unanimated image, then this function will return true . More...
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Glib::RefPtr< Pixbuf > | get_static_image () |
| If an animation is really just a plain image (has only one frame), this function returns that image. More...
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Glib::RefPtr< PixbufAnimationIter > | get_iter (gint64 start_time=g_get_real_time()) |
| Get an iterator for displaying an animation. More...
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| Object (const Object &)=delete |
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Object & | operator= (const Object &)=delete |
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| Object (Object &&src) noexcept |
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Object & | operator= (Object &&src) noexcept |
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void * | get_data (const QueryQuark &key) |
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void | set_data (const Quark &key, void *data) |
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void | set_data_with_c_callback (const Quark &key, void *data, GDestroyNotify notify) |
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void | set_data (const Quark &key, void *data, DestroyNotify notify) |
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void | remove_data (const QueryQuark &quark) |
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void * | steal_data (const QueryQuark &quark) |
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Glib::RefPtr< Glib::Object > | wrap (GObject *object, bool take_copy=false) |
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| ObjectBase (const ObjectBase &)=delete |
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ObjectBase & | operator= (const ObjectBase &)=delete |
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void | set_property_value (const Glib::ustring &property_name, const Glib::ValueBase &value) |
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void | get_property_value (const Glib::ustring &property_name, Glib::ValueBase &value) const |
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void | set_property (const Glib::ustring &property_name, const PropertyType &value) |
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void | get_property (const Glib::ustring &property_name, PropertyType &value) const |
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PropertyType | get_property (const Glib::ustring &property_name) const |
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sigc::connection | connect_property_changed (const Glib::ustring &property_name, const sigc::slot< void()> &slot) |
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sigc::connection | connect_property_changed (const Glib::ustring &property_name, sigc::slot< void()> &&slot) |
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void | freeze_notify () |
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void | thaw_notify () |
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virtual void | reference () const |
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virtual void | unreference () const |
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GObject * | gobj () |
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const GObject * | gobj () const |
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GObject * | gobj_copy () const |
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The gdk-pixbuf library provides a simple mechanism to load and represent animations.
An animation is conceptually a series of frames to be displayed over time. Each frame is the same size. The animation may not be represented as a series of frames internally; for example, it may be stored as a sprite and instructions for moving the sprite around a background. To display an animation you don't need to understand its representation, however; you just ask gdk-pixbuf what should be displayed at a given point in time.
Get an iterator for displaying an animation.
The iterator provides the frames that should be displayed at a given time.
start_time would normally come from g_get_real_time(), and marks the beginning of animation playback. After creating an iterator, you should immediately display the pixbuf returned by Gdk::PixbufAnimationIter::get_pixbuf(). Then, you should install a timeout (with Glib::signal_timeout().connect()) or by some other mechanism ensure that you'll update the image after Gdk::PixbufAnimationIter::get_delay_time() milliseconds. Each time the image is updated, you should reinstall the timeout with the new, possibly-changed delay time.
As a shortcut, the default value of start_time is g_get_real_time().
To update the image (i.e. possibly change the result of Gdk::PixbufAnimationIter::get_pixbuf() to a new frame of the animation), call Gdk::PixbufAnimationIter::advance().
If you're using Gdk::PixbufLoader, in addition to updating the image after the delay time, you should also update it whenever you receive the area_updated signal and Gdk::PixbufAnimationIter::on_currently_loading_frame() returns true
. In this case, the frame currently being fed into the loader has received new data, so needs to be refreshed. The delay time for a frame may also be modified after an area_updated signal, for example if the delay time for a frame is encoded in the data after the frame itself. So your timeout should be reinstalled after any area_updated signal.
A delay time of -1 is possible, indicating "infinite."
- Parameters
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start_time | Time when the animation starts playing. |
- Returns
- An iterator to move over the animation.
If an animation is really just a plain image (has only one frame), this function returns that image.
If the animation is an animation, this function returns a reasonable thing to display as a static unanimated image, which might be the first frame, or something more sophisticated. If an animation hasn't loaded any frames yet, this function will return nullptr
.
- Returns
- Unanimated image representing the animation.