From 8ad40e11906f44ccf44bbb78fbe400a25c93e925 Mon Sep 17 00:00:00 2001
From: rhunk <101876869+rhunk@users.noreply.github.com>
Date: Tue, 28 May 2024 19:03:24 +0200
Subject: [PATCH] feat(native): custom emoji font

---
 native/jni/src/common.h                            |  1 +
 native/jni/src/hooks/custom_emoji_font.h           | 14 ++++++++++++++
 native/jni/src/library.cpp                         | 12 ++++++++++++
 .../me/rhunk/snapenhance/nativelib/NativeConfig.kt |  1 +
 4 files changed, 28 insertions(+)
 create mode 100644 native/jni/src/hooks/custom_emoji_font.h

diff --git a/native/jni/src/common.h b/native/jni/src/common.h
index 6a8c5d81..cab6ac38 100644
--- a/native/jni/src/common.h
+++ b/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 {
diff --git a/native/jni/src/hooks/custom_emoji_font.h b/native/jni/src/hooks/custom_emoji_font.h
new file mode 100644
index 00000000..8e0a8c2e
--- /dev/null
+++ b/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);
+    }
+}
\ No newline at end of file
diff --git a/native/jni/src/library.cpp b/native/jni/src/library.cpp
index 3c4570c9..d4780d63 100644
--- a/native/jni/src/library.cpp
+++ b/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) {
diff --git a/native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeConfig.kt b/native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeConfig.kt
index 3d02f3f6..17d64622 100644
--- a/native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeConfig.kt
+++ b/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,
 )
\ No newline at end of file