private static SolidBrush GetFaceBrush(Prim prim, uint face)
{
// Block sillyness that would cause an exception.
if (face >= Primitive.TextureEntry.MAX_FACES)
{
return(DefaultBrush);
}
var textures = new Primitive.TextureEntry(prim.Texture, 0, prim.Texture.Length);
var facetexture = textures.GetFace(face);
// GetFace throws a generic exception if the parameter is greater than MAX_FACES.
// Compute a color from the texture data AND the color applied. The operation is "Multiplication" aka per-pixel (A*B)/255 or if float in domain 0-1: (A*B)
Texture texture = null;
try {
texture = Texture.GetByUUID(facetexture.TextureID.Guid);
}
catch (Exception e) {
var location = prim.ComputeWorldPosition();
LOG.Warn($"Error decoding image asset {facetexture.TextureID} on face {face} of prim {prim.Id} named '{prim.Name}' at {location} in region {prim.RegionId}, continuing using default texture.", e);
}
if (texture == null)
{
texture = Texture.DEFAULT;
}
return(new SolidBrush(Color.FromArgb(
Math.Max(0, Math.Min(255, (int)(facetexture.RGBA.R * 255f) * texture.AverageColor.R / 255)),
Math.Max(0, Math.Min(255, (int)(facetexture.RGBA.G * 255f) * texture.AverageColor.G / 255)),
Math.Max(0, Math.Min(255, (int)(facetexture.RGBA.B * 255f) * texture.AverageColor.B / 255))
)));
// FromARGB can throw an exception if a parameter is outside 0-255, but that is prevented.
}