internal static ImageSource DecompressTextureToImageSource(byte[] imageData, int width, int height, bool ignoreAlpha, IPixelEffect effect, uint fourCC, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
using (var imageStream = new MemoryStream(imageData))
{
byte[] pixelColors;
if (fourCC == (uint)ImageTextureUtil.DDS_FOURCC.DXT1)
{
pixelColors = DxtUtil.DecompressDxt1(imageStream, width, height);
}
else if (fourCC == (uint)ImageTextureUtil.DDS_FOURCC.DXT3)
{
pixelColors = DxtUtil.DecompressDxt3(imageStream, width, height);
}
else
{
pixelColors = DxtUtil.DecompressDxt5(imageStream, width, height, dxgiFormat);
}
// Copy the pixel colors into a byte array
const int bytesPerPixel = 4;
var stride = width * bytesPerPixel;
var pixelRgba = new byte[pixelColors.Length];
for (var i = 0; i < pixelColors.Length; i += bytesPerPixel)
{
pixelRgba[i + 0] = pixelColors[i + 2];
pixelRgba[i + 1] = pixelColors[i + 1];
pixelRgba[i + 2] = pixelColors[i + 0];
pixelRgba[i + 3] = ignoreAlpha ? (byte)0xff : pixelColors[i + 3];
}
if (effect == null)
{
return(System.Windows.Media.Imaging.BitmapSource.Create(width, height, 96, 96, PixelFormats.Bgra32, null, pixelRgba, stride));
}
var bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var bmpData = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, bmp.PixelFormat);
//Copy the data from the byte array into BitmapData.Scan0
Marshal.Copy(pixelRgba, 0, bmpData.Scan0, pixelRgba.Length);
// Unlock the pixels
bmp.UnlockBits(bmpData);
bmp = effect.Quantize(bmp);
return(ImageHelper.ConvertBitmapToBitmapImage(bmp));
}
}
internal static Bitmap DecompressTextureToBitmap(byte[] imageData, int width, int height, bool ignoreAlpha, uint fourCC, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
using (var imageStream = new MemoryStream(imageData))
{
byte[] pixelColors;
if (fourCC == (uint)ImageTextureUtil.DDS_FOURCC.DXT1)
{
pixelColors = DxtUtil.DecompressDxt1(imageStream, width, height);
}
else if (fourCC == (uint)ImageTextureUtil.DDS_FOURCC.DXT3)
{
pixelColors = DxtUtil.DecompressDxt3(imageStream, width, height);
}
else
{
pixelColors = DxtUtil.DecompressDxt5(imageStream, width, height, dxgiFormat);
}
// Copy the pixel colors into a byte array
const int bytesPerPixel = 4;
var pixelRgba = new byte[pixelColors.Length];
for (var i = 0; i < pixelColors.Length; i += bytesPerPixel)
{
pixelRgba[i + 0] = pixelColors[i + 2];
pixelRgba[i + 1] = pixelColors[i + 1];
pixelRgba[i + 2] = pixelColors[i + 0];
pixelRgba[i + 3] = ignoreAlpha ? (byte)0xff : pixelColors[i + 3];
}
// Here create the Bitmap to the know height, width and format
var bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
// Create a BitmapData and Lock all pixels to be written
var bmpData = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, bmp.PixelFormat);
//Copy the data from the byte array into BitmapData.Scan0
Marshal.Copy(pixelRgba, 0, bmpData.Scan0, pixelRgba.Length);
// Unlock the pixels
bmp.UnlockBits(bmpData);
return(bmp);
}
}
private static void DecompressDxt5Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
byte alpha0 = imageReader.ReadByte();
byte alpha1 = imageReader.ReadByte();
ulong alphaMask = (ulong)imageReader.ReadByte();
alphaMask += (ulong)imageReader.ReadByte() << 8;
alphaMask += (ulong)imageReader.ReadByte() << 16;
alphaMask += (ulong)imageReader.ReadByte() << 24;
alphaMask += (ulong)imageReader.ReadByte() << 32;
alphaMask += (ulong)imageReader.ReadByte() << 40;
ushort c0 = imageReader.ReadUInt16();
ushort c1 = imageReader.ReadUInt16();
byte r0, g0, b0;
byte r1, g1, b1;
switch (dxgiFormat)
{
case ImageTextureUtil.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
break;
case ImageTextureUtil.DXGI_FORMAT.DXGI_FORMAT_UNKNOWN:
break;
default:
break;
}
ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
uint lookupTable = imageReader.ReadUInt32();
for (int blockY = 0; blockY < 4; blockY++)
{
for (int blockX = 0; blockX < 4; blockX++)
{
byte r = 0, g = 0, b = 0, a = 255;
uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
uint alphaIndex = (uint)((alphaMask >> 3 * (4 * blockY + blockX)) & 0x07);
if (alphaIndex == 0)
{
a = alpha0;
}
else if (alphaIndex == 1)
{
a = alpha1;
}
else if (alpha0 > alpha1)
{
a = (byte)(((8 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 7);
}
else if (alphaIndex == 6)
{
a = 0;
}
else if (alphaIndex == 7)
{
a = 0xff;
}
else
{
a = (byte)(((6 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 5);
}
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((2 * r0 + r1) / 3);
g = (byte)((2 * g0 + g1) / 3);
b = (byte)((2 * b0 + b1) / 3);
break;
case 3:
r = (byte)((r0 + 2 * r1) / 3);
g = (byte)((g0 + 2 * g1) / 3);
b = (byte)((b0 + 2 * b1) / 3);
break;
}
int px = (x << 2) + blockX;
int py = (y << 2) + blockY;
if ((px < width) && (py < height))
{
int offset = ((py * width) + px) << 2;
imageData[offset] = r;
imageData[offset + 1] = g;
imageData[offset + 2] = b;
imageData[offset + 3] = a;
}
}
}
}
internal static byte[] DecompressDxt5(Stream imageStream, int width, int height, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
byte[] imageData = new byte[width * height * 4];
using (BinaryReader imageReader = new BinaryReader(imageStream))
{
if (dxgiFormat == ImageTextureUtil.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB)
{
int blockSize = 8;
// For block-compressed formats, compute the pitch as:
int dwPitchOrLinearSize = Math.Max(1, ((width + 3) / 4)) * blockSize;
}
int blockCountX = (width + 3) / 4;
int blockCountY = (height + 3) / 4;
for (int y = 0; y < blockCountY; y++)
{
for (int x = 0; x < blockCountX; x++)
{
DecompressDxt5Block(imageReader, x, y, blockCountX, width, height, imageData, dxgiFormat);
}
}
}
return(imageData);
}
internal static byte[] DecompressDxt5(byte[] imageData, int width, int height, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
using (MemoryStream imageStream = new MemoryStream(imageData))
{
return(DecompressDxt5(imageStream, width, height, dxgiFormat));
}
}
private static void DecompressDxt5Block(BinaryReader imageReader, int x, int y, int blockCountX, int width, int height, byte[] imageData, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
byte alpha0 = imageReader.ReadByte();
byte alpha1 = imageReader.ReadByte();
ulong alphaMask = (ulong)imageReader.ReadByte();
alphaMask += (ulong)imageReader.ReadByte() << 8;
alphaMask += (ulong)imageReader.ReadByte() << 16;
alphaMask += (ulong)imageReader.ReadByte() << 24;
alphaMask += (ulong)imageReader.ReadByte() << 32;
alphaMask += (ulong)imageReader.ReadByte() << 40;
ushort c0 = imageReader.ReadUInt16();
ushort c1 = imageReader.ReadUInt16();
byte r0, g0, b0;
byte r1, g1, b1;
switch (dxgiFormat)
{
case ImageTextureUtil.DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
// there is suport to be some sort of SRGB conversion somwhere here, but I'm not sure where precicly and on what values.
//ConvertSrgbToRgb888(c0, out r0, out g0, out b0);
//ConvertSrgbToRgb888(c1, out r1, out g1, out b1);
var aa = (byte)(255 * D3DX_SRGB_to_FLOAT_inexact(((float)(c0 & 0x000000ff)) / 255));
r0 = (byte)(255 * D3DX_SRGB_to_FLOAT_inexact(((float)(((c0 >> 8) & 0x000000ff))) / 255));
g0 = (byte)(255 * D3DX_SRGB_to_FLOAT_inexact(((float)(c1 & 0x000000ff)) / 255));
b0 = (byte)(255 * D3DX_SRGB_to_FLOAT_inexact(((float)(((c1 >> 8) & 0x000000ff))) / 255));
r1 = r0;
g1 = g0;
b1 = b0;
break;
case ImageTextureUtil.DXGI_FORMAT.DXGI_FORMAT_UNKNOWN:
default:
ConvertRgb565ToRgb888(c0, out r0, out g0, out b0);
ConvertRgb565ToRgb888(c1, out r1, out g1, out b1);
break;
}
uint lookupTable = imageReader.ReadUInt32();
for (int blockY = 0; blockY < 4; blockY++)
{
for (int blockX = 0; blockX < 4; blockX++)
{
byte r = 0, g = 0, b = 0, a = 255;
uint index = (lookupTable >> 2 * (4 * blockY + blockX)) & 0x03;
uint alphaIndex = (uint)((alphaMask >> 3 * (4 * blockY + blockX)) & 0x07);
if (alphaIndex == 0)
{
a = alpha0;
}
else if (alphaIndex == 1)
{
a = alpha1;
}
else if (alpha0 > alpha1)
{
a = (byte)(((8 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 7);
}
else if (alphaIndex == 6)
{
a = 0;
}
else if (alphaIndex == 7)
{
a = 0xff;
}
else
{
a = (byte)(((6 - alphaIndex) * alpha0 + (alphaIndex - 1) * alpha1) / 5);
}
switch (index)
{
case 0:
r = r0;
g = g0;
b = b0;
break;
case 1:
r = r1;
g = g1;
b = b1;
break;
case 2:
r = (byte)((2 * r0 + r1) / 3);
g = (byte)((2 * g0 + g1) / 3);
b = (byte)((2 * b0 + b1) / 3);
break;
case 3:
r = (byte)((r0 + 2 * r1) / 3);
g = (byte)((g0 + 2 * g1) / 3);
b = (byte)((b0 + 2 * b1) / 3);
break;
}
int px = (x << 2) + blockX;
int py = (y << 2) + blockY;
if ((px < width) && (py < height))
{
int offset = ((py * width) + px) << 2;
imageData[offset] = r;
imageData[offset + 1] = g;
imageData[offset + 2] = b;
imageData[offset + 3] = a;
}
}
}
}
