feat(engine): card-art thumbnails in the theme picker

Settings → Cosmetic's theme picker showed only the theme name. Now each chip carries a small Ace-of-Spades + back preview pair so the player can see what each theme looks like before switching. A new ThemeThumbnailCache resource keys per-theme by id and stores two Handle<Image>s (ace + back) rasterised at thumbnail resolution via the existing rasterize_svg path. Generation runs once per theme registration in theme_plugin; subsequent picker re-spawns just look up the cached handles. Themes that lack one of the preview SVGs (broken user theme) get a Handle::default() placeholder rather than crashing — the placeholder renders as a transparent rectangle the same size as the missing thumbnail. The picker chip spawn loop in settings_plugin reads the cache and renders the pair as two child sprites above the chip text. The selected-theme chip's existing STATE_SUCCESS tint sits behind the thumbnails; contrast stays readable. Asset-source plumbing in assets/sources.rs and assets/mod.rs picks up the new bytes-loading helper that the thumbnail generator uses for embedded:// theme assets at startup time (before AssetServer is fully initialised). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-05 00:41:20 +00:00
parent fe41b502ac
commit ba527de351
5 changed files with 535 additions and 18 deletions
@@ -31,7 +31,10 @@ use solitaire_core::card::{Rank, Suit};
 pub use importer::{import_theme, import_theme_into, ImportError, ThemeId};
 pub use loader::{CardThemeLoader, CardThemeLoaderError};
 pub use manifest::ThemeManifest;
-pub use plugin::{set_theme, ActiveTheme, ThemePlugin};
+pub use plugin::{
+    ensure_theme_thumbnails, set_theme, ActiveTheme, ThemePlugin, ThemeThumbnailCache,
+    ThemeThumbnailPair, THEME_THUMBNAIL_HEIGHT_PX, THEME_THUMBNAIL_WIDTH_PX,
+};
 pub use registry::{
    build_registry, refresh_registry, ThemeEntry, ThemeRegistry, ThemeRegistryPlugin,
 };