public static Color GetAverageColor(this IVirtualTexture virtualTexture, Rect rect, float alpha = 0.5f)
{
var colors = new List <Color>();
for (var w = rect.xMin; w < rect.xMin + rect.width; w++)
{
for (var h = rect.yMin; h < rect.yMin + rect.height; h++)
{
var color = virtualTexture.GetPixelColor(w, h);
if (color.a < alpha)
{
continue;
}
colors.Add(color);
}
}
var colorCount = colors.Count;
if (colorCount == 0)
{
return(Color.clear);
}
if (colorCount % 2 == 0)
{
var firstColor = colors[colorCount / 2];
var secondColor = colors[colorCount / 2 - 1];
return((firstColor + secondColor) * 0.5f);
}
return(colors[Mathf.FloorToInt(colorCount * 0.5f)]);
}
public static float GetContrast(this IVirtualTexture virtualTexture, Rect rect)
{
var pixelsContrast = new List <float>();
for (var w = rect.xMin; w < rect.xMin + rect.width; w++)
{
for (var h = rect.yMin; h < rect.yMin + rect.height; h++)
{
var color = virtualTexture.GetPixelColor(w, h);
if (Mathf.Approximately(color.a, 0.0f))
{
continue;
}
var pixelContrast = color.GetLuminance() * color.a;
pixelsContrast.Add(pixelContrast);
}
}
pixelsContrast = pixelsContrast.OrderBy(x => x).ToList();
var pixelsCount = pixelsContrast.Count;
if (pixelsCount % 2 == 0)
{
return((pixelsContrast[pixelsCount / 2] + pixelsContrast[pixelsCount / 2 - 1]) * 0.5f);
}
return(pixelsContrast[Mathf.FloorToInt(pixelsCount * 0.5f)]);
}
public static int GetOpaquePixelCount(this IVirtualTexture virtualTexture, Rect rect)
{
var opaquePixelCount = 0;
for (var w = rect.xMin; w < rect.xMin + rect.width; w++)
{
for (var h = rect.yMin; h < rect.yMin + rect.height; h++)
{
var color = virtualTexture.GetPixelColor(w, h);
if (Mathf.Approximately(color.a, 0.0f))
{
continue;
}
opaquePixelCount++;
}
}
return(opaquePixelCount);
}
