Merge pull request #120 from sgraham/warnings-attempt-2

second attempt at avoiding warnings at /W4 on vs2013

src/nanovg.c

@@ -24,6 +24,12 @@
 #define STBI_HEADER_FILE_ONLY
 #include "stb_image.c"
 
+#ifdef _MSC_VER
+#pragma warning(disable: 4100)  // unreferenced formal parameter
+#pragma warning(disable: 4127)  // conditional expression is constant
+#pragma warning(disable: 4204)  // nonstandard extension used : non-constant aggregate initializer
+#pragma warning(disable: 4706)  // assignment within conditional expression
+#endif
 
 #define NVG_INIT_COMMANDS_SIZE 256
 #define NVG_INIT_POINTS_SIZE 128
@@ -980,7 +986,7 @@ static void nvg__addPoint(struct NVGcontext* ctx, float x, float y, int flags)
 	memset(pt, 0, sizeof(*pt));
 	pt->x = x;
 	pt->y = y;
-	pt->flags = flags;
+	pt->flags = (unsigned char)flags;
 
 	ctx->cache->npoints++;
 	path->count++;

src/nanovg.h

@@ -25,6 +25,11 @@ extern "C" {
 
 #define NVG_PI 3.14159265358979323846264338327f
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4201)  // nonstandard extension used : nameless struct/union
+#endif
+
 struct NVGcontext;
 
 struct NVGcolor {
@@ -584,6 +589,10 @@ struct NVGparams* nvgInternalParams(struct NVGcontext* ctx);
 // Debug function to dump cached path data.
 void nvgDebugDumpPathCache(struct NVGcontext* ctx);
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 #define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; }
 
 #ifdef __cplusplus