wasm: remove ASYNCIFY to reduce binary size

The binary size recently increased due to the ASYNCIFY option, which was required for WebGPU initialization.

To prevent unnecessary binary size growth, ThorVG will no longer depend on asynchronous processes such as `emscripten_sleep` (ASYNCIFY or JSPI).

As a result, the combined WASM binary size has been significantly reduced to less than 1MB.

Size comparison: 1559KB → 998KB (-36%)

cross/wasm32.txt

@@ -12,7 +12,7 @@ exe_suffix = 'js'
 
 [built-in options]
 cpp_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions']
-cpp_link_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sASYNCIFY=1', '-sSTACK_SIZE=2MB', '-sMAX_WEBGL_VERSION=2', '-sFULL_ES3']
+cpp_link_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sSTACK_SIZE=2MB', '-sMAX_WEBGL_VERSION=2', '-sFULL_ES3']
 
 [host_machine]
 system = 'emscripten'

cross/wasm32_wg.txt

@@ -12,7 +12,7 @@ exe_suffix = 'js'
 
 [built-in options]
 cpp_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions']
-cpp_link_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sASYNCIFY=1', '-sSTACK_SIZE=2MB']
+cpp_link_args = ['-Wshift-negative-value', '-flto', '-Os', '-fno-exceptions', '--bind', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sEXPORT_ES6=1', '-sFORCE_FILESYSTEM=1', '-sMODULARIZE=1', '-sEXPORTED_RUNTIME_METHODS=FS', '-sUSE_WEBGPU=1', '-sSTACK_SIZE=2MB']
 
 [host_machine]
 system = 'emscripten'

src/bindings/wasm/tvgWasmLottieAnimation.cpp

@@ -41,9 +41,12 @@ static const char* NoError = "None";
     static WGPUInstance instance{};
     static WGPUAdapter adapter{};
     static WGPUDevice device{};
+    static bool adapterRequested = false;
+    static bool deviceRequested = false;
 #endif
 
-void init()
+// 0: success, 1: fail, 2: wait for async request
+int init()
 {
 #ifdef THORVG_WG_RASTER_SUPPORT
     //Init WebGPU
@@ -51,22 +54,32 @@ void init()
 
     // request adapter
     if (!adapter) {
+        if (adapterRequested) return 2;
+
         const WGPURequestAdapterOptions requestAdapterOptions { .nextInChain = nullptr, .powerPreference = WGPUPowerPreference_HighPerformance, .forceFallbackAdapter = false };
         auto onAdapterRequestEnded = [](WGPURequestAdapterStatus status, WGPUAdapter adapter, char const * message, void * pUserData) { *((WGPUAdapter*)pUserData) = adapter; };
         wgpuInstanceRequestAdapter(instance, &requestAdapterOptions, onAdapterRequestEnded, &adapter);
-        while (!adapter) emscripten_sleep(10);
+
+        adapterRequested = true;
+        return 2;
     }
 
     // request device
+    if (deviceRequested) return device == nullptr ? 2 : 0;
+
     WGPUFeatureName featureNames[32]{};
     size_t featuresCount = wgpuAdapterEnumerateFeatures(adapter, featureNames);
     if (!device) {
         const WGPUDeviceDescriptor deviceDesc { .nextInChain = nullptr, .label = "The device", .requiredFeatureCount = featuresCount, .requiredFeatures = featureNames };
         auto onDeviceRequestEnded = [](WGPURequestDeviceStatus status, WGPUDevice device, char const * message, void * pUserData) { *((WGPUDevice*)pUserData) = device; };
         wgpuAdapterRequestDevice(adapter, &deviceDesc, onDeviceRequestEnded, &device);
-        while (!device) emscripten_sleep(10);
+
+        deviceRequested = true;
+        return 2;
     }
 #endif
+
+    return 0;
 }
 
 void term()