public ICompressedImage Compress(IUncompressedImage image, IBlockCompressionFormat format)
{
if (!AreDimensionsMultipleOfFour(image))
{
throw new InvalidOperationException("Only textures with dimensions that are multiples of " +
$"{BlockFormat.Dimension} can be block compressed.");
}
Logger.Default.Log("Compressing BMP to DDS.");
var dds = DDSImage.CreateEmpty(image.Width, image.Height, format);
int numberOfVerticalBlocks = image.Height / BlockFormat.Dimension;
int numberOfHorizontalBlocks = image.Width / BlockFormat.Dimension;
int numberOfBlocks = numberOfVerticalBlocks * numberOfHorizontalBlocks;
Parallel.For(0, numberOfBlocks,
#if DEBUG
RunInSingleThread,
#endif
(i) =>
{
var blockIndex = PointUtility.FromRowMajor(i, numberOfHorizontalBlocks);
var blockColors = image.GetBlockColors(blockIndex);
var blockData = format.Compress(blockColors);
dds.SetBlockData(blockIndex, blockData);
});
Logger.Default.Log("Compression successful.");
return(dds);
}
public void WriteDataForSoleBlock()
{
var format = new Mock <IBlockCompressionFormat>();
format.Setup(f => f.BlockSize).Returns(BlockFormat.BC1ByteSize);
var bytes = Enumerable.Repeat((byte)200, BlockFormat.BC1ByteSize).ToArray();
var block = BC1BlockData.FromBytes(bytes);
var dds = DDSImage.CreateEmpty(BlockFormat.Dimension, BlockFormat.Dimension, format.Object);
dds.SetBlockData(new Point(0, 0), block.ToBytes());
CollectionAssert.AreEqual(dds.GetBuffer(), bytes);
}
public void ConstructionCalculatesBufferSize()
{
var format = new Mock <IBlockCompressionFormat>();
format.Setup(f => f.BlockSize).Returns(BlockFormat.BC1ByteSize);
const int byteCount = 8;
const int blockCount = 4;
const int width = 2 * BlockFormat.Dimension; // Two horizontal and
const int height = 2 * BlockFormat.Dimension; // vertical blocks
var dds = DDSImage.CreateEmpty(width, height, format.Object);
Assert.AreEqual(width, dds.Width);
Assert.AreEqual(height, dds.Height);
Assert.AreEqual(blockCount * byteCount, dds.GetBuffer().Length);
}
public void WriteDataForMultipleBlocks()
{
const int numberOfBlocks = 4;
var format = new Mock <IBlockCompressionFormat>();
format.Setup(f => f.BlockSize).Returns(BlockFormat.BC1ByteSize);
var block1 = Enumerable.Repeat((byte)50, BlockFormat.BC1ByteSize).ToArray();
var block2 = Enumerable.Repeat((byte)100, BlockFormat.BC1ByteSize).ToArray();
var block3 = Enumerable.Repeat((byte)150, BlockFormat.BC1ByteSize).ToArray();
var block4 = Enumerable.Repeat((byte)200, BlockFormat.BC1ByteSize).ToArray();
var buffer = new byte[numberOfBlocks * BlockFormat.BC1ByteSize];
Array.Copy(block1, 0, buffer, 0, BlockFormat.BC1ByteSize);
Array.Copy(block2, 0, buffer, 8, BlockFormat.BC1ByteSize);
Array.Copy(block3, 0, buffer, 16, BlockFormat.BC1ByteSize);
Array.Copy(block4, 0, buffer, 24, BlockFormat.BC1ByteSize);
var data1 = BC1BlockData.FromBytes(block1).ToBytes();
var data2 = BC1BlockData.FromBytes(block2).ToBytes();
var data3 = BC1BlockData.FromBytes(block3).ToBytes();
var data4 = BC1BlockData.FromBytes(block4).ToBytes();
int widthAndHeight = 2 * BlockFormat.Dimension;
var ddsImage = DDSImage.CreateEmpty(widthAndHeight, widthAndHeight, format.Object);
ddsImage.SetBlockData(new Point(0, 0), data1);
ddsImage.SetBlockData(new Point(1, 0), data2);
ddsImage.SetBlockData(new Point(0, 1), data3);
ddsImage.SetBlockData(new Point(1, 1), data4);
CollectionAssert.AreEqual(ddsImage.GetBuffer(), buffer);
}
