Premultiplied alpha content processor
As mentioned in my previous post, a Content Processor that converts textures into premultiplied alpha format:
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content.Pipeline;
using Microsoft.Xna.Framework.Content.Pipeline.Graphics;
using Microsoft.Xna.Framework.Content.Pipeline.Processors;
namespace PremultipliedAlpha
{
[ContentProcessor]
class PremultipliedAlphaTextureProcessor : TextureProcessor
{
public override TextureContent Process(TextureContent input, ContentProcessorContext context)
{
input.ConvertBitmapType(typeof(PixelBitmapContent<Color>));
foreach (MipmapChain mipChain in input.Faces)
{
foreach (PixelBitmapContent<Color> bitmap in mipChain)
{
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
Color c = bitmap.GetPixel(x, y);
c.R = (byte)(c.R * c.A / 255);
c.G = (byte)(c.G * c.A / 255);
c.B = (byte)(c.B * c.A / 255);
bitmap.SetPixel(x, y, c);
}
}
}
}
return base.Process(input, context);
}
}
}
