renderer: ++wasm build portability

removed the direct thread inclusion
when those thread features are disabled

src/renderer/tvgTaskScheduler.cpp

@@ -20,24 +20,17 @@
  * SOFTWARE.
  */
 
-#include <thread>
-#include <atomic>
+
 #include "tvgArray.h"
 #include "tvgInlist.h"
 #include "tvgTaskScheduler.h"
 
-
 /************************************************************************/
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
 namespace tvg {
 
-struct TaskSchedulerImpl;
-static TaskSchedulerImpl* _inst = nullptr;
-static std::thread::id _tid;   //dominant thread id
-
-
 #ifdef THORVG_THREAD_SUPPORT
 
 static thread_local bool _async = true;
@@ -196,11 +189,14 @@ struct TaskSchedulerImpl
 /* External Class Implementation                                        */
 /************************************************************************/
 
+static TaskSchedulerImpl* _inst = nullptr;
+static ThreadID _tid;   //dominant thread id
+
 void TaskScheduler::init(uint32_t threads)
 {
     if (_inst) return;
     _inst = new TaskSchedulerImpl(threads);
-    _tid = std::this_thread::get_id();
+    _tid = tid();
 }
 
 
@@ -219,8 +215,7 @@ void TaskScheduler::request(Task* task)
 
 uint32_t TaskScheduler::threads()
 {
-    if (_inst) return _inst->threadCnt();
-    return 0;
+    return _inst ? _inst->threadCnt() : 0;
 }
 
 
@@ -230,7 +225,18 @@ void TaskScheduler::async(bool on)
     _async = on;
 }
 
+
 bool TaskScheduler::onthread()
 {
-    return _tid != std::this_thread::get_id();
+    return _tid != tid();
+}
+
+
+ThreadID TaskScheduler::tid()
+{
+#ifdef THORVG_THREAD_SUPPORT
+    return std::this_thread::get_id();
+#else
+    return 0;
+#endif
 }

src/renderer/tvgTaskScheduler.h

@@ -23,16 +23,23 @@
 #ifndef _TVG_TASK_SCHEDULER_H_
 #define _TVG_TASK_SCHEDULER_H_
 
-#include <mutex>
-#include <condition_variable>
-
 #include "tvgCommon.h"
 #include "tvgInlist.h"
 
+#ifdef THORVG_THREAD_SUPPORT
+    #include <atomic>
+    #include <thread>
+    #include <mutex>
+    #include <condition_variable>
+#endif
+
 namespace tvg {
 
+
 #ifdef THORVG_THREAD_SUPPORT
 
+using ThreadID = std::thread::id;
+
 struct Task
 {
 private:
@@ -79,6 +86,8 @@ private:
 
 #else  //THORVG_THREAD_SUPPORT
 
+using ThreadID = uint8_t;
+
 struct Task
 {
 public:
@@ -105,6 +114,7 @@ struct TaskScheduler
     static void request(Task* task);
     static void async(bool on);
     static bool onthread();  //figure out whether on worker thread or not
+    static ThreadID tid();
 };
 
 }  //namespace

src/savers/gif/tvgGifSaver.cpp

@@ -21,7 +21,7 @@
  */
 
 #include <cstring>
-
+#include <memory>
 #include "tvgStr.h"
 #include "tvgGifEncoder.h"
 #include "tvgGifSaver.h"