Better rounding for quantization to remove text rendering jitter

example/demo.c

@@ -750,7 +750,7 @@ void renderDemo(struct NVGcontext* vg, float mx, float my, float width, float he
 
 	nvgSave(vg);
 	if (blowup) {
-//			nvgRotate(vg, 3.0f/180.0f*NVG_PI);
+		nvgRotate(vg, sinf(t*0.3f)*5.0f/180.0f*NVG_PI);
 		nvgScale(vg, 2.0f, 2.0f);
 	}
 

src/nanovg.c

@@ -1572,7 +1572,7 @@ void nvgFontFace(struct NVGcontext* ctx, const char* font)
 
 static float nvg__quantize(float a, float d)
 {
-	return ((int)(a / d)) * d;
+	return ((int)(a / d + 0.5f)) * d;
 }
 
 float nvgText(struct NVGcontext* ctx, float x, float y, const char* string, const char* end)