rlottie: Improve VectorPath

Author: yuraiz

src/components/mod.rs

@@ -6,4 +6,4 @@ mod vector_path;
 pub(crate) use self::avatar::Avatar;
 pub(crate) use self::message_entry::MessageEntry;
 pub(crate) use self::snow::Snow;
-pub(crate) use self::vector_path::StickerPreview;
+pub(crate) use self::vector_path::VectorPath;

src/components/vector_path.rs

@@ -1,76 +1,89 @@
-use gtk::glib;
 use gtk::prelude::*;
 use gtk::subclass::prelude::*;
+use gtk::{glib, graphene, gsk};
 
 use tdlib::types::ClosedVectorPath;
 
 mod imp {
     use super::*;
-    use gtk::graphene;
     use std::cell::RefCell;
-    use tdlib::enums::VectorPathCommand::{CubicBezierCurve, Line};
-    use tdlib::types::VectorPathCommandCubicBezierCurve as Curve;
 
     #[derive(Default)]
-    pub struct StickerPreview {
-        pub(super) path: RefCell<Vec<ClosedVectorPath>>,
+    pub struct VectorPath {
+        pub(super) node: RefCell<Option<gsk::RenderNode>>,
     }
 
     #[glib::object_subclass]
-    impl ObjectSubclass for StickerPreview {
+    impl ObjectSubclass for VectorPath {
         const NAME: &'static str = "ComponentsVectorPath";
-        type Type = super::StickerPreview;
+        type Type = super::VectorPath;
         type ParentType = gtk::Widget;
+
+        fn class_init(klass: &mut Self::Class) {
+            klass.set_css_name("vectorpath");
+        }
     }
 
-    impl ObjectImpl for StickerPreview {}
+    impl ObjectImpl for VectorPath {}
 
-    impl WidgetImpl for StickerPreview {
+    impl WidgetImpl for VectorPath {
         fn snapshot(&self, snapshot: &gtk::Snapshot) {
             let widget = self.obj();
 
-            let context = snapshot.append_cairo(&graphene::Rect::new(0.0, 0.0, 512.0, 512.0));
-
-            let scale = widget.width().max(widget.height()) as f64 / 512.0;
-            context.scale(scale, scale);
-
-            context.set_source_rgba(0.5, 0.5, 0.5, 0.4);
-
-            let outline = &*self.path.borrow();
+            let factor = (widget.width() as f32).max(widget.height() as f32) / 512.0;
+            snapshot.scale(factor, factor);
 
-            for closed_path in outline {
-                for command in &closed_path.commands {
-                    match command {
-                        Line(line) => {
-                            let e = &line.end_point;
-                            context.line_to(e.x, e.y);
-                        }
-                        CubicBezierCurve(curve) => {
-                            let Curve {
-                                start_control_point: sc,
-                                end_control_point: ec,
-                                end_point: e,
-                            } = curve;
-
-                            context.curve_to(sc.x, sc.y, ec.x, ec.y, e.x, e.y);
-                        }
-                    }
-                }
-                _ = context.fill();
+            if let Some(node) = &*self.node.borrow() {
+                snapshot.append_node(node);
             }
         }
     }
 }
 
 glib::wrapper! {
-    pub struct StickerPreview(ObjectSubclass<imp::StickerPreview>)
+    pub struct VectorPath(ObjectSubclass<imp::VectorPath>)
         @extends gtk::Widget;
 }
 
-impl StickerPreview {
-    pub fn new(outline: Vec<ClosedVectorPath>) -> Self {
+impl VectorPath {
+    pub fn new(outline: &[ClosedVectorPath]) -> Self {
         let obj: Self = glib::Object::new(&[]);
-        obj.imp().path.replace(outline);
+        obj.imp().node.replace(Self::path_node(outline));
         obj
     }
+
+    fn path_node(outline: &[ClosedVectorPath]) -> Option<gsk::RenderNode> {
+        use tdlib::enums::VectorPathCommand::{CubicBezierCurve, Line};
+        use tdlib::types::VectorPathCommandCubicBezierCurve as Curve;
+
+        let snapshot = gtk::Snapshot::new();
+        let context = snapshot.append_cairo(&graphene::Rect::new(0.0, 0.0, 512.0, 512.0));
+
+        context.set_source_rgba(0.5, 0.5, 0.5, 0.4);
+
+        for closed_path in outline {
+            context.new_sub_path();
+            for command in &closed_path.commands {
+                match command {
+                    Line(line) => {
+                        let e = &line.end_point;
+                        context.line_to(e.x, e.y);
+                    }
+                    CubicBezierCurve(curve) => {
+                        let Curve {
+                            start_control_point: sc,
+                            end_control_point: ec,
+                            end_point: e,
+                        } = curve;
+
+                        context.curve_to(sc.x, sc.y, ec.x, ec.y, e.x, e.y);
+                    }
+                }
+            }
+            context.close_path();
+        }
+        _ = context.fill();
+
+        snapshot.to_node()
+    }
 }

src/session/content/message_row/sticker.rs

@@ -8,7 +8,7 @@ use std::io::Cursor;
 use tdlib::enums::{MessageContent, StickerFormat, StickerFullType};
 use tdlib::types::File;
 
-use crate::components::StickerPreview;
+use crate::components::VectorPath;
 use crate::session::content::message_row::{MessageBase, MessageBaseImpl, MessageIndicators};
 use crate::tdlib::Message;
 use crate::utils::spawn;
@@ -178,7 +178,7 @@ impl MessageBaseExt for MessageSticker {
         imp.aspect_ratio
             .set(sticker.width as f64 / sticker.height as f64);
 
-        let preview = StickerPreview::new(sticker.outline.clone());
+        let preview = VectorPath::new(&sticker.outline);
         self.imp().bin.set_child(Some(&preview));
 
         if sticker.sticker.local.is_downloading_completed {