/// <summary>
/// Creates a Blp2 object from the specified data stream.
/// </summary>
/// <param name="stream">A stream that contains the data of a Blp2 or System.Drawing.Image picture.</param>
/// <returns>Blp2 object containing the image of the stream.</returns>
/// <exception cref=""></exception>
public static Blp2 FromStream(Stream stream)
{
using (BinaryReader br = new BinaryReader(stream)) {
Blp2Header header = Blp2Header.FromBinaryReader(br);
Blp2 ret = new Blp2();
if (new string(header.fourCC) == "BLP2")
{
ret.bmp = new Bitmap((int)header.width, (int)header.height, PixelFormat.Format32bppArgb);
BitmapData bmpData = ret.bmp.LockBits(new Rectangle(0, 0, ret.bmp.Width, ret.bmp.Height), ImageLockMode.ReadWrite, ret.bmp.PixelFormat);
byte[] imgData = new byte[header.lengths[0]];
br.BaseStream.Seek(header.offsets[0], SeekOrigin.Begin);
imgData = br.ReadBytes(imgData.Length);
// BLP2 conversion
if (header.type == DataType.Uncompressed_DirectX && header.encoding == Encoding.RAW1 &&
(header.alphaDepth == AlphaDepth.NoAlpha || header.alphaDepth == AlphaDepth.Alpha1Bit || header.alphaDepth == AlphaDepth.Alpha8Bit))
{
// Uncompressed paletted image
ret.format = FileFormat.Raw;
// Load palette (4-byte BGRA color values)
br.BaseStream.Seek(Marshal.SizeOf(typeof(Blp2Header)), SeekOrigin.Begin);
byte[] colorData = br.ReadBytes(256 * 4);
Color[] c = new Color[256];
for (int i = 0; i < 1024; i += 4)
{
c[i / 4] = Color.FromArgb(255, colorData[i], colorData[i + 1], colorData[i + 2]);
}
// Read indexed bitmap
byte[] decompImgData = new byte[header.width * header.height * 4];
for (int i = 0; i < (header.width * header.height); i++)
{
decompImgData[i * 4] = c[imgData[i]].R;
decompImgData[i * 4 + 1] = c[imgData[i]].G;
decompImgData[i * 4 + 2] = c[imgData[i]].B;
decompImgData[i * 4 + 3] = 255;
}
// Apply alpha channels
if (header.alphaDepth == AlphaDepth.Alpha8Bit)
{
// 8-bits alpha
br.BaseStream.Seek(header.offsets[0] + header.width * header.height, SeekOrigin.Begin);
byte[] alphaData = br.ReadBytes((int)(header.width * header.height));
for (int i = 0; i < (header.width * header.height); i++)
{
decompImgData[i * 4 + 3] = alphaData[i];
}
}
else if (header.alphaDepth == AlphaDepth.Alpha1Bit)
{
// 1-bits alpha
br.BaseStream.Seek(header.offsets[0] + (header.width * header.height), SeekOrigin.Begin);
byte[] alphaData = br.ReadBytes((int)(header.width * header.height / 8));
for (int i = 0; i < (header.width * header.height / 8); i++)
{
for (int j = 0; j < 8; j++)
{
decompImgData[i * 32 + ((j + 1) * 4) - 1] = (byte)((alphaData[i] & 1 << j) == 1 << j ? 255 : 0);
}
}
}
Marshal.Copy(decompImgData, 0, bmpData.Scan0, decompImgData.Length);
}
else if (header.type == DataType.Uncompressed_DirectX && header.encoding == Encoding.RAW3 &&
(header.alphaDepth == AlphaDepth.NoAlpha || header.alphaDepth == AlphaDepth.Alpha1Bit || header.alphaDepth == AlphaDepth.Alpha8Bit))
{
// Uncompressed BGRA image
ret.format = FileFormat.Raw;
Marshal.Copy(imgData, 0, bmpData.Scan0, imgData.Length);
}
else if (header.type == DataType.Uncompressed_DirectX && header.encoding == Encoding.DXT &&
(header.alphaEncoding == AlphaEncoding.DXT1 || header.alphaEncoding == AlphaEncoding.DXT3 || header.alphaEncoding == AlphaEncoding.DXT5))
{
// DXT1/3/5
ret.format = FileFormat.Dxt;
byte[] decompImgData = new byte[header.width * header.height * 4];
LibSquish.DxtFormat flags = 0;
switch (header.alphaEncoding)
{
case AlphaEncoding.DXT1:
flags = LibSquish.DxtFormat.Dxt1;
break;
case AlphaEncoding.DXT3:
flags = LibSquish.DxtFormat.Dxt3;
break;
case AlphaEncoding.DXT5:
flags = LibSquish.DxtFormat.Dxt5;
break;
}
LibSquish.DecompressImage(decompImgData, header.width, header.height, imgData, (int)flags);
RemapRGBA(ref decompImgData);
Marshal.Copy(decompImgData, 0, bmpData.Scan0, decompImgData.Length);
}
else if (header.type == DataType.JPEG)
{
ret.format = FileFormat.Jpeg;
ret.bmp.UnlockBits(bmpData);
throw new NotImplementedException();
}
else
{
ret.bmp.UnlockBits(bmpData);
throw new BlpFormatException("The given BLP2 format is not supported.");
}
ret.bmp.UnlockBits(bmpData);
}
else
{
try {
// Let System.Drawing.Image handle loading
ret.bmp = (Bitmap)Image.FromStream(stream);
ret.format = FileFormat.Image;
} catch (ArgumentException e) {
throw new BlpFormatException("The stream did not contain valid image data.", e.InnerException);
}
}
ret.header = header;
return(ret);
}
}
/// <summary>
/// Saves the currently loaded image to a Dxt encoded Blp file.
/// </summary>
/// <param name="filename">The path to the output file.</param>
/// <param name="format">Dxt format. See <see cref="LibSquish.DxtFormat"/></param>
/// <param name="resizeMethod">Method for possibly required resizing. See <see cref="FixSize"/></param>
/// <param name="hasMipmaps">Specifies whether mipmaps are generated or not.</param>
/// <param name="compression">Compression method used by LibSquish. Affects quality / speed. See <see cref="LibSquish.ColorCompression"/></param>
public void Save(string filename, LibSquish.DxtFormat format, ResizeMethod resizeMethod, bool hasMipmaps, LibSquish.ColorCompression compression = LibSquish.ColorCompression.ClusterFit)
{
if (bmp != null)
{
FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.Write);
using (BinaryWriter bw = new BinaryWriter(fs)) {
Blp2Header header = new Blp2Header(DataType.Uncompressed_DirectX, Encoding.DXT, 0, 0, (byte)(hasMipmaps ? 1 : 0), 0, 0);
List <Bitmap> bmps = new List <Bitmap>();
// Add resized image to the output
bmps.Add(FixSize(resizeMethod));
header.width = (uint)bmps[0].Width;
header.height = (uint)bmps[0].Height;
// Add mipmaps
if (hasMipmaps)
{
bmps.AddRange(GenerateMipmaps(bmps[0]));
}
byte[] compImgData = { };
byte[] colorPalette = new byte[256 * 4];
switch (format)
{
case LibSquish.DxtFormat.Dxt1:
header.alphaEncoding = AlphaEncoding.DXT1;
header.alphaDepth = AlphaDepth.Alpha1Bit;
break;
case LibSquish.DxtFormat.Dxt3:
header.alphaEncoding = AlphaEncoding.DXT3;
header.alphaDepth = AlphaDepth.Alpha8Bit;
break;
case LibSquish.DxtFormat.Dxt5:
header.alphaEncoding = AlphaEncoding.DXT5;
header.alphaDepth = AlphaDepth.Alpha8Bit;
break;
}
for (int i = 0; i < bmps.Count; i++)
{
// Copy raw image data to byte array
BitmapData bmpData = bmps[i].LockBits(new Rectangle(0, 0, bmps[i].Width, bmps[i].Height), ImageLockMode.ReadOnly, bmps[i].PixelFormat);
byte[] imgData = new byte[bmpData.Stride * bmps[i].Height];
Marshal.Copy(bmpData.Scan0, imgData, 0, bmpData.Stride * bmps[i].Height);
bmps[i].UnlockBits(bmpData);
// Set up conversion flags
int flags = (int)format | (int)compression | (int)LibSquish.ColorErrorMetric.Perceptual;
// Compress to DXT format
RemapRGBA(ref imgData);
byte[] buff = new byte[LibSquish.GetStorageRequirements((uint)bmps[i].Width, (uint)bmps[i].Height, flags)];
LibSquish.CompressImage(imgData, (uint)bmps[i].Width, (uint)bmps[i].Height, buff, flags);
Array.Resize(ref compImgData, compImgData.Length + buff.Length);
buff.CopyTo(compImgData, compImgData.Length - buff.Length);
// Image data locations
header.offsets[i] = (i > 0) ? header.offsets[i - 1] + header.lengths[i - 1] : (uint)(Marshal.SizeOf(typeof(Blp2Header)) + colorPalette.Length);
header.lengths[i] = (uint)buff.Length;
}
bw.Write(header.GetBytes());
bw.Write(colorPalette);
bw.Write(compImgData);
}
}
else
{
throw new BlpConversionException("No image data to convert.");
}
}
