| public static GetMemorySize ( int width, int height, int depth, PixelFormat format ) : int | ||
| width | int | Width of the area |
| height | int | Height of the area |
| depth | int | Depth of the area |
| format | PixelFormat | Format of the area |
| Результат | int | |
public static int GetMemorySize( int width, int height, int depth, PixelFormat format )
{
if ( IsCompressed( format ) )
{
switch ( format )
{
case PixelFormat.DXT1:
return ( ( width + 3 ) / 4 ) * ( ( height + 3 ) / 4 ) * 8 * depth;
case PixelFormat.DXT2:
case PixelFormat.DXT3:
case PixelFormat.DXT4:
case PixelFormat.DXT5:
return ( ( width + 3 ) / 4 ) * ( ( height + 3 ) / 4 ) * 16 * depth;
default:
throw new Exception( "Invalid compressed pixel format" );
}
}
else
{
return width * height * depth * GetNumElemBytes( format );
}
}
public PixelBox GetPixelBox(int face, int mipmap)
{
if (mipmap > numMipMaps)
{
throw new IndexOutOfRangeException();
}
if (face > this.NumFaces)
{
throw new IndexOutOfRangeException();
}
// Calculate mipmap offset and size
int width = this.Width;
int height = this.Height;
int depth = this.Depth;
int faceSize = 0; // Size of one face of the image
int offset = 0;
for (int mip = 0; mip < mipmap; ++mip)
{
faceSize = PixelUtil.GetMemorySize(width, height, depth, this.Format);
/// Skip all faces of this mipmap
offset += faceSize * this.NumFaces;
/// Half size in each dimension
if (width != 1)
{
width /= 2;
}
if (height != 1)
{
height /= 2;
}
if (depth != 1)
{
depth /= 2;
}
}
// We have advanced to the desired mipmap, offset to right face
faceSize = PixelUtil.GetMemorySize(width, height, depth, this.Format);
offset += faceSize * face;
// Return subface as pixelbox
IntPtr newBufPtr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, offset);
return(new PixelBox(width, height, depth, this.Format, newBufPtr));
}
