public static Bitmap CreateBitmap(string filename, int depthSlice, int width, int height, bool ignoreAlpha = false)
{
var extension = Path.GetExtension(filename).ToLower();
if (extension == ".png")
{
// TODO: rescale the bitmap to specified width/height.
return((Bitmap)Image.FromFile(filename, true));
}
else if (extension == ".dds")
{
uint fourCC;
var pixelChannel = ReadTextureFile(filename, depthSlice, ref width, ref height, out fourCC);
if (pixelChannel == null)
{
return(null);
}
try
{
if (fourCC == (uint)DDS_FOURCC.DXT3 || fourCC == (uint)DDS_FOURCC.DXT5)
{
return(DxtUtil.DecompressDxt5TextureToBitmap(pixelChannel, width, height, ignoreAlpha));
}
}
catch { return(null); }
}
return(null);
}
internal static Bitmap DecompressDxt5TextureToBitmap(byte[] imageData, int width, int height, bool ignoreAlpha, ImageTextureUtil.DXGI_FORMAT dxgiFormat)
{
using (var imageStream = new MemoryStream(imageData))
{
var pixelColors = DxtUtil.DecompressDxt5(imageStream, width, height, dxgiFormat);
//var pixelColors = DxtUtil.DecompressDxt3(imageStream, width, height);
//var pixelColors = DxtUtil.DecompressDxt1(imageStream, width, height);
// 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);
}
}
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));
}
}
