public TGAImage(GenericImage image)
{
IDLength = 0;
ColorMapType = 0;
// currently only uncomrepssed export is supported
ImageType = 2;
ColorMapOffset = 0;
ColorMapEntryCount = 0;
ColorMapBitsPerPixel = 0;
XOrigin = 0;
YOrigin = 0;
Width = (ushort)image.width;
Height = (ushort)image.height;
int channelCount = (int)Math.Max(3, Math.Min(4, image.channels));
BitsPerPixel = (byte)(channelCount * 8);
DiscriptioField = 0;
ImageID = new byte[0];
ColorMap = new byte[0];
ImageData = new byte[Width * Height * channelCount];
for (int y = 0; y < Height; ++y)
{
for (int x = 0; x < Width; ++x)
{
for (int c = 0; c < channelCount; ++c)
{
ImageData[c + channelCount * (x + y * Width)] = (byte)(image.GetPixelChannel(0, 0, 0, (uint)y, (uint)x, (uint)c) * 255);
}
}
}
}
protected override double ApplyFilter(uint x_, uint y_, uint z_, uint mipmap, uint layer, uint channel, ref GenericImage image)
{
uint x = (uint)Math.Max(1, ((int)image.width >> (int)mipmap));
uint y = (uint)Math.Max(1, ((int)image.height >> (int)mipmap));
uint z = (uint)Math.Max(1, ((int)image.depth >> (int)mipmap));
uint x2 = (uint)Math.Max(1, ((int)image.width >> (int)(mipmap - 1)));
uint y2 = (uint)Math.Max(1, ((int)image.height >> (int)(mipmap - 1)));
uint z2 = (uint)Math.Max(1, ((int)image.depth >> (int)(mipmap - 1)));
uint dX = x2 / x;
uint dY = y2 / y;
uint dZ = z2 / z;
double value = 0;
uint count = 0;
for (uint d = 0; d < dZ; ++d)
{
for (uint h = 0; h < dY; ++h)
{
for (uint w = 0; w < dX; ++w)
{
++count;
value += image.GetPixelChannel(mipmap - 1, layer, z_ * dZ + d, y_ * dY + h, x_ * dX + w, channel);
}
}
}
if (count > 0)
{
return(value / count);
}
else
{
return(0);
}
}