[Themes] Implement chat background image (#64)

* [Themes] hardcode fuyu chat bg

* [Themes > BG] listen to theme file

* remove .apply()

* some uhh misc changes

* readd

* how

* [Global] Minor changes

---------

Co-authored-by: Beef <beefers@riseup.net>

src/def.d.ts

@@ -124,8 +124,17 @@ interface ThemeData {
     description?: string;
     authors?: Author[];
     spec: number;
-    semanticColors?: Record<string, string[]>;
+    semanticColors?: Record<string, (string | false)[]>;
     rawColors?: Record<string, string>;
+    background?: {
+        url: string;
+        blur?: number;
+        /**
+         * The alpha value of the background.
+         * `CHAT_BACKGROUND` of semanticColors alpha value will be ignored when this is specified 
+        */
+        alpha?: number;
+    }
 }
 
 interface Theme {

src/index.ts

@@ -2,6 +2,7 @@ import { patchLogHook } from "@lib/debug";
 import { patchCommands } from "@lib/commands";
 import { initPlugins } from "@lib/plugins";
 import { patchAssets } from "@ui/assets";
+import { patchChatBackground } from "@lib/themes";
 import initQuickInstall from "@ui/quickInstall";
 import initSafeMode from "@ui/safeMode";
 import initSettings from "@ui/settings";
@@ -15,6 +16,7 @@ export default async () => {
         patchLogHook(),
         patchAssets(),
         patchCommands(),
+        patchChatBackground(),
         initFixes(),
         initSafeMode(),
         initSettings(),

src/lib/plugins.ts

@@ -68,7 +68,7 @@ export async function evalPlugin(plugin: Plugin) {
 
     const raw = (0, eval)(pluginString)(vendettaForPlugins);
     const ret = typeof raw == "function" ? raw() : raw;
-    return ret.default || ret;
+    return ret?.default || ret;
 }
 
 export async function startPlugin(id: string) {

src/lib/themes.ts

@@ -1,6 +1,6 @@
 import { Theme, ThemeData } from "@types";
-import { findByProps } from "@metro/filters";
 import { ReactNative, chroma } from "@metro/common";
+import { findByName, findByProps } from "@metro/filters";
 import { instead } from "@lib/patcher";
 import { createFileBackend, createMMKVBackend, createStorage, wrapSync, awaitSyncWrapper } from "@lib/storage";
 import { safeFetch } from "@utils";
@@ -19,6 +19,21 @@ async function writeTheme(theme: Theme | {}) {
     await createFileBackend("vendetta_theme.json").set(theme);
 }
 
+export function patchChatBackground() {
+    const currentTheme = getCurrentTheme()?.data?.background;
+    if (!currentTheme) return;
+
+    const MessagesWrapperConnected = findByName("MessagesWrapperConnected", false);
+    if (!MessagesWrapperConnected) return;
+
+    return instead("default", MessagesWrapperConnected, (args, orig) => React.createElement(ReactNative.ImageBackground, {
+        style: { flex: 1, height: "100%" },
+        source: { uri: currentTheme.url },
+        blurRadius: currentTheme.blur,
+        children: orig(...args),
+    }));
+}
+
 function normalizeToHex(colorString: string): string {
     if (chroma.valid(colorString)) return chroma(colorString).hex();
 
@@ -39,7 +54,7 @@ function processData(data: ThemeData) {
 
         for (const key in semanticColors) {
             for (const index in semanticColors[key]) {
-                semanticColors[key][index] = normalizeToHex(semanticColors[key][index]);
+                semanticColors[key][index] &&= normalizeToHex(semanticColors[key][index] as string);
             }
         }
     }
@@ -158,6 +173,10 @@ export async function initThemes() {
         const themeIndex = theme === "amoled" ? 2 : theme === "light" ? 1 : 0;
 
         const semanticColorVal = selectedTheme.data?.semanticColors?.[name]?.[themeIndex];
+        if (name === "CHAT_BACKGROUND" && typeof selectedTheme.data?.background?.alpha === "number") {
+            return chroma(semanticColorVal || "black").alpha(1 - selectedTheme.data.background.alpha).hex();
+        }
+
         if (semanticColorVal) return semanticColorVal;
 
         const rawValue = selectedTheme.data?.rawColors?.[colorDef.raw];