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decoder: Support animated formats (GIF, WEBP, APNG)

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Closes #27
This commit is contained in:
Sophie Herold 2023-03-15 22:35:59 +01:00 • committed by Christopher Davis
parent ea9063de0f
commit f33c4bd470
9 changed files with 368 additions and 80 deletions
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15
src/widgets/sliding_view.rs
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@ -1,8 +1,6 @@
//! A sliding view widget for images
//!
//! This widget it similar to `AdwCarousel`.
//! Currently, there is no swipe-gesture support since it's not working with
//! `GtkScrolledWindow` anyways.
use crate::deps::*;
use crate::widgets::LpImagePage;
@ -152,15 +150,26 @@ mod imp {
let position_shift = self.position_shift.get() as f32;
for (page_index, page) in self.pages.borrow().iter().enumerate() {
let page_position = page_index as f32;
// reverse page order for RTL languages
let direction_sign = if self.is_rtl() { -1. } else { 1. };
// This positions the pages within the carousel and shifts them
// according to the position that should currently be shown.
let x = direction_sign
* (page_index as f32 - scroll_position - position_shift)
* (page_position - scroll_position - position_shift)
* (width as f32 + self.page_spacing(width));
// Only show visible images
if page_position == (scroll_position + position_shift).floor()
|| page_position == (scroll_position + position_shift).ceil()
{
page.set_visible(true);
} else {
page.set_visible(false);
}
let transform = gsk::Transform::new().translate(&graphene::Point::new(x, 0.));
page.allocate(width, height, 0, Some(transform));
page.image().allocate(width, height, 0, None);