feat(GmsCore): add Custom branding icon patch

src/main/kotlin/app/revanced/patches/gmscore/branding/icon/CustomBrandingIconPatch.kt

@@ -0,0 +1,116 @@
+package app.revanced.patches.gmscore.branding.icon
+
+import app.revanced.patcher.data.ResourceContext
+import app.revanced.patcher.patch.options.PatchOption.PatchExtensions.stringPatchOption
+import app.revanced.util.ResourceGroup
+import app.revanced.util.Utils.trimIndentMultiline
+import app.revanced.util.copyFile
+import app.revanced.util.copyResources
+import app.revanced.patcher.patch.ResourcePatch
+
+import app.revanced.util.underBarOrThrow
+
+//@Suppress("unused")
+object CustomBrandingIconPatch : ResourcePatch(
+    name = "Custom branding icon",
+    description = "Changes the app icon to the icon specified in options.json.",
+    compatiblePackages = setOf(
+        CompatiblePackage("app.revanced.android.gms")
+            )
+) {
+    private const val DEFAULT_ICON = "revancify_blue"
+
+    private val availableIcon = mapOf(
+        "MMT" to "mmt",
+        "Revancify Blue" to DEFAULT_ICON,
+        "Revancify Red" to "revancify_red"
+    )
+
+    private val sizeArray = arrayOf(
+        "xxxhdpi",
+        "xxhdpi",
+        "xhdpi",
+        "hdpi",
+        "mdpi",
+    )
+
+    private val mipmapDirectories = sizeArray.map { "mipmap-$it" }
+
+    private val launcherIconResourceFileNames = arrayOf(
+        "ic_app",
+        "ic_app_round",
+        "ic_app_foreground",
+        "ic_app_foreground_mono",
+        "ic_app_background"
+    ).map { "$it.png" }.toTypedArray()
+
+    private fun List<String>.getResourceGroup(fileNames: Array<String>) = map { directory ->
+        ResourceGroup(
+            directory, *fileNames
+        )
+    }
+
+    private val iconResourceGroups =
+        mipmapDirectories.getResourceGroup(launcherIconResourceFileNames)
+
+    // region patch option
+
+    val AppIcon = stringPatchOption(
+        key = "AppIcon",
+        default = DEFAULT_ICON,
+        values = availableIcon,
+        title = "App icon",
+        description = """
+            The icon to apply to the app.
+            
+            If a path to a folder is provided, the folder must contain the following folders:
+
+            ${mipmapDirectories.joinToString("\n") { "- $it" }}
+
+            Each of these folders must contain the following files:
+
+            ${launcherIconResourceFileNames.joinToString("\n") { "- $it" }}
+            """.trimIndentMultiline(),
+        required = true
+    )
+
+    // endregion
+
+    override fun execute(context: ResourceContext) {
+
+        // Check patch options first.
+        val appIcon = AppIcon
+            .underBarOrThrow()
+
+        val appIconResourcePath = "gmscore/branding/icon/$appIcon"
+
+        context.copyResources("gmscore/branding/icon", ResourceGroup("mipmap-anydpi-v26", "ic_app.xml"))
+        // Check if a custom path is used in the patch options.
+        if (!availableIcon.containsValue(appIcon)) {
+            context.copyFile(
+                iconResourceGroups,
+                appIcon,
+                "WARNING: Invalid app icon path: $appIcon. Does not apply patches."
+            )
+        } else {
+            // Change launcher icon.
+
+            iconResourceGroups.let { resourceGroups ->
+                resourceGroups.forEach {
+                    context.copyResources(appIconResourcePath, it)
+                }
+            }
+        }
+        val manifest = context.get("AndroidManifest.xml", false)
+        manifest.writeText(
+            manifest.readText()
+                .replace(
+                    "\"@mipmap/ic_app_settings\"",
+                    "\"@mipmap/ic_app\"",
+                ).replace(
+                    "android:roundIcon=\"@mipmap/ic_app\"",
+                    "android:roundIcon=\"@mipmap/ic_app_round\""
+                ),
+        )
+    }
+}

src/main/kotlin/app/revanced/util/Utils.kt

@@ -0,0 +1,8 @@
+package app.revanced.util
+
+internal object Utils {
+    internal fun String.trimIndentMultiline() =
+        this.split("\n")
+            .joinToString("\n") { it.trimIndent() } // Remove the leading whitespace from each line.
+            .trimIndent() // Remove the leading newline.
+}

src/main/resources/gmscore/branding/icon/mipmap-anydpi-v26/ic_app.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon
+  xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_app_background" />
+    <foreground android:drawable="@mipmap/ic_app_foreground" />
+    <monochrome android:drawable="@mipmap/ic_app_foreground_mono" />
+</adaptive-icon>