feat(native): custom emoji font

native/jni/src/common.h

@@ -13,6 +13,7 @@ typedef struct {
     bool disable_bitmoji;
     bool disable_metrics;
     bool composer_hooks;
+    char custom_emoji_font_path[256];
 } native_config_t;
 
 namespace common {

native/jni/src/hooks/custom_emoji_font.h

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace CustomEmojiFont {
+    HOOK_DEF(int, open_hook, const char *pathname, int flags, mode_t mode) {
+        if (strstr(pathname, "/system/fonts/NotoColorEmoji.ttf") != 0 && common::native_config->custom_emoji_font_path[0] != 0) {
+            pathname = common::native_config->custom_emoji_font_path;
+        }
+        return open_hook_original(pathname, flags, mode);
+    }
+
+    void init() {
+        DobbyHook((void *) DobbySymbolResolver("libc.so", "open"), (void *)open_hook, (void **)&open_hook_original);
+    }
+}

native/jni/src/library.cpp

@@ -11,6 +11,7 @@
 #include "hooks/sqlite_mutex.h"
 #include "hooks/duplex_hook.h"
 #include "hooks/composer_hook.h"
+#include "hooks/custom_emoji_font.h"
 
 bool JNICALL init(JNIEnv *env, jobject clazz) {
     LOGD("Initializing native");
@@ -38,6 +39,9 @@ bool JNICALL init(JNIEnv *env, jobject clazz) {
     RUN(FstatHook::init());
     RUN(SqliteMutexHook::init());
     RUN(DuplexHook::init(env));
+    if (common::native_config->custom_emoji_font_path[0] != 0) {
+        RUN(CustomEmojiFont::init());
+    }
     if (common::native_config->composer_hooks) {
         RUN(ComposerHook::init());
     }
@@ -58,6 +62,14 @@ void JNICALL load_config(JNIEnv *env, jobject, jobject config_object) {
     native_config->disable_bitmoji = GET_CONFIG_BOOL("disableBitmoji");
     native_config->disable_metrics = GET_CONFIG_BOOL("disableMetrics");
     native_config->composer_hooks = GET_CONFIG_BOOL("composerHooks");
+
+    memset(native_config->custom_emoji_font_path, 0, sizeof(native_config->custom_emoji_font_path));
+    auto custom_emoji_font_path = env->GetObjectField(config_object, env->GetFieldID(native_config_clazz, "customEmojiFontPath", "Ljava/lang/String;"));
+    if (custom_emoji_font_path != nullptr) {
+        auto custom_emoji_font_path_str = env->GetStringUTFChars((jstring) custom_emoji_font_path, nullptr);
+        strncpy(native_config->custom_emoji_font_path, custom_emoji_font_path_str, sizeof(native_config->custom_emoji_font_path));
+        env->ReleaseStringUTFChars((jstring) custom_emoji_font_path, custom_emoji_font_path_str);
+    }
 }
 
 void JNICALL lock_database(JNIEnv *env, jobject, jstring database_name, jobject runnable) {

native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeConfig.kt

@@ -4,4 +4,5 @@ data class NativeConfig(
     val disableBitmoji: Boolean = false,
     val disableMetrics: Boolean = false,
     val composerHooks: Boolean = false,
+    val customEmojiFontPath: String? = null,
 )