Create a resource manager that preloads the images

otg/gtk/src/app_window.rs

@@ -14,7 +14,7 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License along with On the Grid. If not, see <https://www.gnu.org/licenses/>.
 */
 
-use crate::CoreApi;
+use crate::{CoreApi, ResourceManager};
 use adw::prelude::*;
 
 use otg_core::{
@@ -22,7 +22,7 @@ use otg_core::{
     CoreRequest, CoreResponse,
 };
 use sgf::GameRecord;
-use std::sync::{Arc, RwLock};
+use std::{rc::Rc, sync::{Arc, RwLock}};
 
 use crate::views::{GameReview, HomeView, SettingsView};
 
@@ -58,10 +58,12 @@ pub struct AppWindow {
     // Not liking this, but I have to keep track of the settings view model separately from
     // anything else. I'll have to look into this later.
     settings_view_model: Arc<RwLock<Option<SettingsView>>>,
+
+    resources: Rc<ResourceManager>,
 }
 
 impl AppWindow {
-    pub fn new(app: &adw::Application, core: CoreApi) -> Self {
+    pub fn new(app: &adw::Application, core: CoreApi, resources: ResourceManager) -> Self {
         let window = Self::setup_window(app);
         let overlay = Self::setup_overlay();
         let stack = adw::NavigationView::new();
@@ -77,6 +79,7 @@ impl AppWindow {
             overlay,
             core,
             settings_view_model: Default::default(),
+            resources: Rc::new(resources),
         };
 
         let home = s.setup_home();

otg/gtk/src/lib.rs

@@ -21,10 +21,12 @@ pub use app_window::AppWindow;
 
 mod views;
 
-use async_std::task::{yield_now};
-use otg_core::{Core, Observable, CoreRequest, CoreResponse};
-use std::{rc::Rc};
-
+use async_std::task::yield_now;
+use gio::resources_lookup_data;
+use gtk::gdk_pixbuf::{Colorspace, InterpType, Pixbuf};
+use image::{io::Reader as ImageReader, ImageError};
+use otg_core::{Core, CoreRequest, CoreResponse, Observable};
+use std::{cell::RefCell, collections::HashMap, io::Cursor, rc::Rc};
 
 #[derive(Clone)]
 pub struct CoreApi {
@@ -37,6 +39,92 @@ impl CoreApi {
     }
 }
 
+#[derive(Clone)]
+pub enum Resource {
+    Image(Pixbuf),
+}
+
+pub struct ResourceManager {
+    resources: Rc<RefCell<HashMap<String, Resource>>>,
+}
+
+impl ResourceManager {
+    pub fn new() -> Self {
+        let mut resources = HashMap::new();
+
+        for (path, xres, yres, transparency) in [
+            (
+                "/com/luminescent-dreams/otg-gtk/wood_texture.jpg",
+                840,
+                840,
+                false,
+            ),
+            (
+                "/com/luminescent-dreams/otg-gtk/black_stone.png",
+                40,
+                40,
+                true,
+            ),
+            (
+                "/com/luminescent-dreams/otg-gtk/white_stone.png",
+                40,
+                40,
+                true,
+            ),
+        ] {
+            match perftrace(&format!("loading {}", path), || {
+                Self::load_image(path, transparency, xres, yres)
+            }) {
+                Ok(Some(image)) => {
+                    resources.insert(path.to_owned(), Resource::Image(image));
+                }
+                Ok(None) => println!("no image in resource bundle for {}", path),
+                Err(err) => println!("failed to load image {}: {}", path, err),
+            }
+        }
+
+        Self {
+            resources: Rc::new(RefCell::new(resources)),
+        }
+    }
+
+    pub fn resource(&self, path: &str) -> Option<Resource> {
+        self.resources.borrow().get(path).cloned()
+    }
+
+    fn load_image(
+        path: &str,
+        transparency: bool,
+        width: i32,
+        height: i32,
+    ) -> Result<Option<Pixbuf>, ImageError> {
+        let image_bytes = resources_lookup_data(path, gio::ResourceLookupFlags::NONE).unwrap();
+
+        let image = ImageReader::new(Cursor::new(image_bytes))
+            .with_guessed_format()
+            .unwrap()
+            .decode();
+        image.map(|image| {
+            let stride = if transparency {
+                image.to_rgba8().sample_layout().height_stride
+            } else {
+                image.to_rgb8().sample_layout().height_stride
+            };
+            Pixbuf::from_bytes(
+                &glib::Bytes::from(image.as_bytes()),
+                Colorspace::Rgb,
+                transparency,
+                8,
+                image.width() as i32,
+                image.height() as i32,
+                stride as i32,
+            )
+            .scale_simple(width, height, InterpType::Nearest)
+        })
+    }
+
+}
+
 pub fn perftrace<F, A>(trace_name: &str, f: F) -> A
 where
     F: FnOnce() -> A,

otg/gtk/src/main.rs

@@ -4,8 +4,7 @@ use async_std::task::spawn;
 use gio::ActionEntry;
 use otg_core::{Config, ConfigOption, Core, CoreNotification, LibraryPath, Observable};
 use otg_gtk::{
-    AppWindow,
-    CoreApi,
+    AppWindow, CoreApi, ResourceManager
 };
 
 
@@ -123,8 +122,9 @@ fn main() {
 
     app.connect_activate({
         move |app| {
+            let resources = ResourceManager::new();
             let core_api = CoreApi { core: core.clone() };
-            let app_window = AppWindow::new(app, core_api);
+            let app_window = AppWindow::new(app, core_api, resources);
 
             setup_app_configuration_action(app, app_window.clone());