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Poddav
2014-07-21 23:26:28 +04:00
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GameRes/ImageTGA.cs Normal file
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//! \file ImageTGA.cs
//! \date Fri Jul 04 07:24:38 2014
//! \brief Targa image implementation.
//
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.ComponentModel.Composition;
namespace GameRes
{
public class TgaMetaData : ImageMetaData
{
public short ImageType;
public short ColormapType;
public uint ColormapOffset;
public ushort ColormapFirst;
public ushort ColormapLength;
public short ColormapDepth;
public short Descriptor;
}
[Export(typeof(ImageFormat))]
public class TgaFormat : ImageFormat
{
public override string Tag { get { return "TGA"; } }
public override string Description { get { return "Truevision TGA image"; } }
public override uint Signature { get { return 0; } }
public override ImageData Read (Stream stream, ImageMetaData metadata)
{
var meta = metadata as TgaMetaData;
if (null == meta)
throw new System.ArgumentException ("TgaFormat.Read should be supplied with TgaMetaData", "metadata");
int colormap_size = meta.ColormapLength * meta.ColormapDepth / 8;
int width = (int)meta.Width;
int height = (int)meta.Height;
int bpp = meta.BPP;
long image_offset = meta.ColormapOffset;
if (1 == meta.ColormapType)
image_offset += colormap_size;
switch (meta.ImageType)
{
case 1: // Uncompressed, color-mapped images.
case 3: // Uncompressed, black and white images.
case 9: // Runlength encoded color-mapped images.
case 10: // Runlength encoded RGB images.
case 11: // Compressed, black and white images.
case 32: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding.
case 33: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding. 4-pass quadtree-type process.
throw new System.NotImplementedException();
default:
throw new InvalidFormatException();
case 2: // Uncompressed, RGB images.
{
PixelFormat pixel_format;
switch (bpp)
{
default: throw new InvalidFormatException();
case 24: pixel_format = PixelFormats.Bgr24; break;
case 32: pixel_format = PixelFormats.Bgra32; break;
case 15: pixel_format = PixelFormats.Bgr555; break;
case 16: pixel_format = PixelFormats.Bgr565; break;
}
stream.Position = image_offset;
int stride = width*((bpp+7)/8);
byte[] data = new byte[stride*height];
if (0 != (meta.Descriptor & 0x20))
{
if (data.Length != stream.Read (data, 0, data.Length))
throw new InvalidFormatException();
}
else
{
for (int row = height-1; row >= 0; --row)
{
if (stride != stream.Read (data, row*stride, stride))
throw new InvalidFormatException();
}
}
var bitmap = BitmapSource.Create (width, height, 96, 96, pixel_format, null,
data, stride);
bitmap.Freeze();
return new ImageData (bitmap, meta);
}
throw new InvalidFormatException();
}
}
public override void Write (Stream stream, ImageData image)
{
using (var file = new BinaryWriter (stream, System.Text.Encoding.ASCII, true))
{
file.Write ((byte)0); // idlength
file.Write ((byte)0); // colourmaptype
file.Write ((byte)2); // datatypecode
file.Write ((short)0); // colourmaporigin
file.Write ((short)0); // colourmaplength
file.Write ((byte)0); // colourmapdepth
file.Write ((short)image.OffsetX);
file.Write ((short)image.OffsetY);
file.Write ((ushort)image.Width);
file.Write ((ushort)image.Height);
var bitmap = image.Bitmap;
int bpp = 0;
int stride = 0;
byte descriptor = 0;
if (PixelFormats.Bgr24 == bitmap.Format)
{
bpp = 24;
stride = (int)image.Width*3;
}
else if (PixelFormats.Bgr32 == bitmap.Format)
{
bpp = 32;
stride = (int)image.Width*4;
}
else
{
bpp = 32;
stride = (int)image.Width*4;
if (PixelFormats.Bgra32 != bitmap.Format)
{
var converted_bitmap = new FormatConvertedBitmap();
converted_bitmap.BeginInit();
converted_bitmap.Source = image.Bitmap;
converted_bitmap.DestinationFormat = PixelFormats.Bgra32;
converted_bitmap.EndInit();
bitmap = converted_bitmap;
}
}
file.Write ((byte)bpp);
file.Write (descriptor);
byte[] row_data = new byte[stride];
Int32Rect rect = new Int32Rect (0, (int)image.Height, (int)image.Width, 1);
for (uint row = 0; row < image.Height; ++row)
{
--rect.Y;
bitmap.CopyPixels (rect, row_data, stride, 0);
file.Write (row_data);
}
}
}
public override ImageMetaData ReadMetaData (Stream stream)
{
using (var file = new ArcView.Reader (stream))
{
short id_length = file.ReadByte();
short colormap_type = file.ReadByte();
if (colormap_type > 1)
return null;
short image_type = file.ReadByte();
ushort colormap_first = file.ReadUInt16();
ushort colormap_length = file.ReadUInt16();
short colormap_depth = file.ReadByte();
int pos_x = file.ReadInt16();
int pos_y = file.ReadInt16();
uint width = file.ReadUInt16();
uint height = file.ReadUInt16();
int bpp = file.ReadByte();
if (bpp != 32 && bpp != 24 && bpp != 16 && bpp != 15 && bpp != 8)
return null;
short descriptor = file.ReadByte();
uint colormap_offset = (uint)(18 + id_length);
switch (image_type)
{
default: return null;
case 1: // Uncompressed, color-mapped images.
case 2: // Uncompressed, RGB images.
case 3: // Uncompressed, black and white images.
case 9: // Runlength encoded color-mapped images.
case 10: // Runlength encoded RGB images.
case 11: // Compressed, black and white images.
case 32: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding.
case 33: // Compressed color-mapped data, using Huffman, Delta, and
// runlength encoding. 4-pass quadtree-type process.
break;
}
return new TgaMetaData {
OffsetX = pos_x,
OffsetY = pos_y,
Width = width,
Height = height,
BPP = bpp,
ImageType = image_type,
ColormapType = colormap_type,
ColormapOffset = colormap_offset,
ColormapFirst = colormap_first,
ColormapLength = colormap_length,
ColormapDepth = colormap_depth,
Descriptor = descriptor,
};
}
}
}
}