gst-plugins-rs/video/gtk4/src/sink/paintable/mod.rs

//
// Copyright (C) 2021 Bilal Elmoussaoui <bil.elmoussaoui@gmail.com>
// Copyright (C) 2021 Jordan Petridis <jordan@centricular.com>
// Copyright (C) 2021 Sebastian Dröge <sebastian@centricular.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at
// <https://mozilla.org/MPL/2.0/>.
//
// SPDX-License-Identifier: MPL-2.0

use crate::sink::frame::{Frame, Paintable};

use gtk::prelude::*;
use gtk::subclass::prelude::*;
use gtk::{gdk, glib};

use gst::{gst_debug, gst_trace};

mod imp;

glib::wrapper! {
    pub struct SinkPaintable(ObjectSubclass<imp::SinkPaintable>)
        @implements gdk::Paintable;
}

impl SinkPaintable {
    pub fn new() -> Self {
        glib::Object::new(&[]).expect("Failed to create a SinkPaintable")
    }
}

impl Default for SinkPaintable {
    fn default() -> Self {
        Self::new()
    }
}

impl SinkPaintable {
    pub(crate) fn handle_frame_changed(&self, frame: Option<Frame>) {
        let self_ = imp::SinkPaintable::from_instance(self);
        if let Some(frame) = frame {
            gst_trace!(imp::CAT, obj: self, "Received new frame");

            let paintable: Paintable = frame.into();
            let new_size = (paintable.width(), paintable.height());

            let old_paintable = self_.paintable.replace(Some(paintable));
            let old_size = old_paintable.map(|p| (p.width(), p.height()));

            if Some(new_size) != old_size {
                gst_debug!(
                    imp::CAT,
                    obj: self,
                    "Size changed from {:?} to {:?}",
                    old_size,
                    new_size,
                );
                self.invalidate_size();
            }

            self.invalidate_contents();
        }
    }
}