arch(draw): add parallel rendering architecture

BREAKING CHANGE

This is a huge update which introduces parallel rendering. lv_conf.h needs to be updated too.

src/stdlib/lv_sprintf.h

@@ -0,0 +1,49 @@
+/**
+ * lv_snprintf.h
+ *
+ */
+
+#ifndef _LV_SPRINTF_H_
+#define _LV_SPRINTF_H_
+
+#if defined(__has_include)
+    #if __has_include(<inttypes.h>)
+        #include <inttypes.h>
+        /* platform-specific printf format for int32_t, usually "d" or "ld" */
+        #define LV_PRId32 PRId32
+        #define LV_PRIu32 PRIu32
+        #define LV_PRIx32 PRIx32
+        #define LV_PRIX32 PRIX32
+    #else
+        #define LV_PRId32 "d"
+        #define LV_PRIu32 "u"
+        #define LV_PRIx32 "x"
+        #define LV_PRIX32 "X"
+    #endif
+#else
+    /* hope this is correct for ports without __has_include or without inttypes.h */
+    #define LV_PRId32 "d"
+    #define LV_PRIu32 "u"
+    #define LV_PRIx32 "x"
+    #define LV_PRIX32 "X"
+#endif
+
+#include <stdbool.h>
+#include <stdarg.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+int lv_snprintf(char * buffer, size_t count, const char * format, ...);
+
+int lv_vsnprintf(char * buffer, size_t count, const char * format, va_list va);
+
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif  /* _LV_SPRINTF_H_*/