viewer: add export feature

src/fs.rs

@@ -18,6 +18,14 @@ pub fn create_file(filename: &str) -> Option<PathBuf> {
         .save_file()
 }
 
+pub fn export_texture(filename: &str) -> Option<PathBuf> {
+    FileDialog::new()
+        .set_directory("~")
+        .add_filter("Images", &["png", "jpg", "jpeg", "webp"])
+        .set_file_name(filename)
+        .save_file()
+}
+
 pub fn open_image_rgba<P>(path: P) -> Result<ImageData>
 where
     P: AsRef<Path>,

src/viewer/actions.rs

@@ -6,14 +6,15 @@ use paperdoll_tar::paperdoll::PaperdollFactory;
 
 use crate::{
     common::{allocate_size_fit_in_rect, upload_image_to_texture},
-    fs::select_file,
+    fs::{export_texture, select_file},
 };
 
 use super::ViewerApp;
 
 pub enum Action {
     AppQuit,
     DollChanged,
+    Export,
     FileOpen,
     FileOpenPath(PathBuf),
     PpdChanged(Option<PaperdollFactory>),
@@ -36,6 +37,22 @@ impl ViewerApp {
                 Action::DollChanged => {
                     self.actions.push_back(Action::TextureUpdate);
                 }
+                Action::Export => {
+                    let Some(ppd) = &self.ppd else {
+                        continue;
+                    };
+
+                    if let Some(path) = export_texture(&format!("{}.png", ppd.meta.name)) {
+                        let image = ppd.render_paperdoll(&self.paperdoll)?;
+                        image::save_buffer(
+                            path,
+                            &image.pixels,
+                            image.width,
+                            image.height,
+                            image::ColorType::Rgba8,
+                        )?;
+                    }
+                }
                 Action::FileOpen => {
                     if let Some(path) = select_file() {
                         self.load_ppd_from_path(&path)?;

src/viewer/menu.rs

@@ -59,6 +59,14 @@ impl ViewerApp {
 
                 ui.separator();
 
+                if ui.button("Export").clicked() {
+                    self.actions.push_back(Action::Export);
+
+                    ui.close_menu();
+                }
+
+                ui.separator();
+
                 if ui
                     .add(
                         Button::new("Quit")