touch.cpp

//
// Created by mrjar on 12/1/2025.
//

#include "touch.h"
#include "imgui/imgui.h"
#include "imgui/backends/imgui_impl_android.h"

#include <android/input.h>
#include <stdio.h>

extern "C" {
#include "inlinehook.h"
#include "dynlib.h"
}

typedef int32_t (*new_input_t)(void*, void*, bool, long, void*, void**);
static new_input_t orig_new_input = nullptr;

static int32_t hook_new_input(void* instanceThiz, void* param1, bool param2, long param3, void* param4, void** thiz_ptr) {

    printf("[Touch] hook_new_input: called (instance=%p param2=%d param3=%ld)\n",
           instanceThiz, param2, param3);

    int32_t result = orig_new_input(instanceThiz, param1, param2, param3, param4, thiz_ptr);

    if (thiz_ptr && *thiz_ptr) {
        printf("[Touch] Forwarding touch event to ImGui (AInputEvent=%p)\n", *thiz_ptr);
        ImGui_ImplAndroid_HandleInputEvent((AInputEvent*)(*thiz_ptr));
    } else {
        printf("[Touch] No AInputEvent to forward.\n");
    }

    return result;
}

void hook_touch() {
    printf("[HOOK] Installing touch hook...\n");

    const char* consume_symbol =
        "_ZN7android13InputConsumer7consumeEPNS_26InputEventFactoryInterfaceEblPjPPNS_10InputEventE";

    void* touch_sym = gpwn_dlsym("libinput.so", consume_symbol);

    if (touch_sym) {
        printf("[HOOK] Found InputConsumer::consume @ %p\n", touch_sym);

        hook_addr(touch_sym,
                  (void*)hook_new_input,
                  (void**)&orig_new_input,
                  GPWN_AARCH64_LEGACYHOOK);

        printf("[HOOK] Touch hook successfully installed.\n");
    } else {
        printf("[HOOK] ERROR: Failed to find InputConsumer::consume symbol!\n");
    }
}