Add font family selector for watermark text

pixstrip-gtk/src/app.rs

@@ -66,6 +66,7 @@ pub struct JobConfig {
     pub watermark_opacity: f32,
     pub watermark_font_size: f32,
     pub watermark_color: [u8; 4],
+    pub watermark_font_family: String,
     pub watermark_use_image: bool,
     // Rename
     pub rename_enabled: bool,
@@ -360,6 +361,7 @@ fn build_ui(app: &adw::Application) {
             watermark_opacity: 0.5,
             watermark_font_size: 24.0,
             watermark_color: [255, 255, 255, 255],
+            watermark_font_family: String::new(),
             watermark_use_image: false,
             rename_enabled: if remember { sess_state.rename_enabled.unwrap_or(false) } else { false },
             rename_prefix: String::new(),
@@ -1666,6 +1668,7 @@ fn run_processing(_window: &adw::ApplicationWindow, ui: &WizardUi) {
                 font_size: cfg.watermark_font_size,
                 opacity: cfg.watermark_opacity,
                 color: cfg.watermark_color,
+                font_family: if cfg.watermark_font_family.is_empty() { None } else { Some(cfg.watermark_font_family.clone()) },
             });
         }
     }
@@ -2595,6 +2598,7 @@ fn build_preset_from_config(cfg: &JobConfig, name: &str) -> pixstrip_core::prese
                 font_size: cfg.watermark_font_size,
                 opacity: cfg.watermark_opacity,
                 color: cfg.watermark_color,
+                font_family: if cfg.watermark_font_family.is_empty() { None } else { Some(cfg.watermark_font_family.clone()) },
             })
         } else {
             None

pixstrip-gtk/src/steps/step_watermark.rs

@@ -61,7 +61,31 @@ pub fn build_watermark_page(state: &AppState) -> adw::NavigationPage {
         .adjustment(&gtk::Adjustment::new(cfg.watermark_font_size as f64, 8.0, 200.0, 1.0, 10.0, 0.0))
         .build();
 
+    // Font family picker
+    let font_row = adw::ActionRow::builder()
+        .title("Font Family")
+        .subtitle("Choose a typeface for the watermark text")
+        .build();
+
+    let font_dialog = gtk::FontDialog::builder()
+        .title("Choose Watermark Font")
+        .modal(true)
+        .build();
+    let font_button = gtk::FontDialogButton::builder()
+        .dialog(&font_dialog)
+        .valign(gtk::Align::Center)
+        .build();
+
+    // Set initial font if one was previously selected
+    if !cfg.watermark_font_family.is_empty() {
+        let desc = gtk::pango::FontDescription::from_string(&cfg.watermark_font_family);
+        font_button.set_font_desc(&desc);
+    }
+
+    font_row.add_suffix(&font_button);
+
     text_group.add(&text_row);
+    text_group.add(&font_row);
     text_group.add(&font_size_row);
     content.append(&text_group);
 
@@ -415,6 +439,16 @@ pub fn build_watermark_page(state: &AppState) -> adw::NavigationPage {
             jc.borrow_mut().watermark_font_size = row.value() as f32;
         });
     }
+    // Wire font family picker
+    {
+        let jc = state.job_config.clone();
+        font_button.connect_font_desc_notify(move |btn| {
+            let desc = btn.font_desc();
+            if let Some(family) = desc.family() {
+                jc.borrow_mut().watermark_font_family = family.to_string();
+            }
+        });
+    }
     // Wire position grid buttons
     for (i, btn) in buttons.iter().enumerate() {
         let jc = state.job_config.clone();