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225 lines
9.9 KiB
C#
225 lines
9.9 KiB
C#
//! \file ImageTGA.cs
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//! \date Fri Jul 04 07:24:38 2014
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//! \brief Targa image implementation.
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//
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// Copyright (C) 2014 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System.IO;
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using System.Text;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.ComponentModel.Composition;
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namespace GameRes
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{
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public class TgaMetaData : ImageMetaData
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{
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public short ImageType;
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public short ColormapType;
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public uint ColormapOffset;
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public ushort ColormapFirst;
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public ushort ColormapLength;
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public short ColormapDepth;
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public short Descriptor;
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}
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[Export(typeof(ImageFormat))]
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public class TgaFormat : ImageFormat
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{
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public override string Tag { get { return "TGA"; } }
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public override string Description { get { return "Truevision TGA image"; } }
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public override uint Signature { get { return 0; } }
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public override ImageData Read (Stream stream, ImageMetaData metadata)
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{
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var meta = metadata as TgaMetaData;
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if (null == meta)
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throw new System.ArgumentException ("TgaFormat.Read should be supplied with TgaMetaData", "metadata");
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int colormap_size = meta.ColormapLength * meta.ColormapDepth / 8;
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int width = (int)meta.Width;
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int height = (int)meta.Height;
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int bpp = meta.BPP;
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long image_offset = meta.ColormapOffset;
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if (1 == meta.ColormapType)
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image_offset += colormap_size;
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switch (meta.ImageType)
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{
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case 1: // Uncompressed, color-mapped images.
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case 3: // Uncompressed, black and white images.
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case 9: // Runlength encoded color-mapped images.
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case 10: // Runlength encoded RGB images.
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case 11: // Compressed, black and white images.
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case 32: // Compressed color-mapped data, using Huffman, Delta, and
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// runlength encoding.
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case 33: // Compressed color-mapped data, using Huffman, Delta, and
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// runlength encoding. 4-pass quadtree-type process.
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throw new System.NotImplementedException();
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default:
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throw new InvalidFormatException();
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case 2: // Uncompressed, RGB images.
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{
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PixelFormat pixel_format;
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switch (bpp)
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{
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default: throw new InvalidFormatException();
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case 24: pixel_format = PixelFormats.Bgr24; break;
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case 32: pixel_format = PixelFormats.Bgra32; break;
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case 15: pixel_format = PixelFormats.Bgr555; break;
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case 16: pixel_format = PixelFormats.Bgr565; break;
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}
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stream.Position = image_offset;
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int stride = width*((bpp+7)/8);
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byte[] data = new byte[stride*height];
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if (0 != (meta.Descriptor & 0x20))
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{
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if (data.Length != stream.Read (data, 0, data.Length))
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throw new InvalidFormatException();
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}
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else
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{
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for (int row = height-1; row >= 0; --row)
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{
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if (stride != stream.Read (data, row*stride, stride))
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throw new InvalidFormatException();
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}
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}
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var bitmap = BitmapSource.Create (width, height, 96, 96, pixel_format, null,
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data, stride);
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bitmap.Freeze();
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return new ImageData (bitmap, meta);
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}
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throw new InvalidFormatException();
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}
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}
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public override void Write (Stream stream, ImageData image)
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{
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using (var file = new BinaryWriter (stream, System.Text.Encoding.ASCII, true))
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{
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file.Write ((byte)0); // idlength
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file.Write ((byte)0); // colourmaptype
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file.Write ((byte)2); // datatypecode
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file.Write ((short)0); // colourmaporigin
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file.Write ((short)0); // colourmaplength
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file.Write ((byte)0); // colourmapdepth
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file.Write ((short)image.OffsetX);
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file.Write ((short)image.OffsetY);
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file.Write ((ushort)image.Width);
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file.Write ((ushort)image.Height);
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var bitmap = image.Bitmap;
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int bpp = 0;
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int stride = 0;
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byte descriptor = 0;
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if (PixelFormats.Bgr24 == bitmap.Format)
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{
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bpp = 24;
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stride = (int)image.Width*3;
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}
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else if (PixelFormats.Bgr32 == bitmap.Format)
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{
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bpp = 32;
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stride = (int)image.Width*4;
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}
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else
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{
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bpp = 32;
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stride = (int)image.Width*4;
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if (PixelFormats.Bgra32 != bitmap.Format)
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{
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var converted_bitmap = new FormatConvertedBitmap();
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converted_bitmap.BeginInit();
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converted_bitmap.Source = image.Bitmap;
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converted_bitmap.DestinationFormat = PixelFormats.Bgra32;
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converted_bitmap.EndInit();
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bitmap = converted_bitmap;
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}
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}
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file.Write ((byte)bpp);
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file.Write (descriptor);
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byte[] row_data = new byte[stride];
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Int32Rect rect = new Int32Rect (0, (int)image.Height, (int)image.Width, 1);
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for (uint row = 0; row < image.Height; ++row)
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{
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--rect.Y;
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bitmap.CopyPixels (rect, row_data, stride, 0);
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file.Write (row_data);
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}
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}
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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using (var file = new ArcView.Reader (stream))
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{
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short id_length = file.ReadByte();
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short colormap_type = file.ReadByte();
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if (colormap_type > 1)
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return null;
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short image_type = file.ReadByte();
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ushort colormap_first = file.ReadUInt16();
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ushort colormap_length = file.ReadUInt16();
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short colormap_depth = file.ReadByte();
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int pos_x = file.ReadInt16();
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int pos_y = file.ReadInt16();
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uint width = file.ReadUInt16();
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uint height = file.ReadUInt16();
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int bpp = file.ReadByte();
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if (bpp != 32 && bpp != 24 && bpp != 16 && bpp != 15 && bpp != 8)
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return null;
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short descriptor = file.ReadByte();
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uint colormap_offset = (uint)(18 + id_length);
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switch (image_type)
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{
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default: return null;
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case 1: // Uncompressed, color-mapped images.
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case 2: // Uncompressed, RGB images.
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case 3: // Uncompressed, black and white images.
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case 9: // Runlength encoded color-mapped images.
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case 10: // Runlength encoded RGB images.
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case 11: // Compressed, black and white images.
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case 32: // Compressed color-mapped data, using Huffman, Delta, and
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// runlength encoding.
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case 33: // Compressed color-mapped data, using Huffman, Delta, and
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// runlength encoding. 4-pass quadtree-type process.
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break;
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}
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return new TgaMetaData {
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OffsetX = pos_x,
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OffsetY = pos_y,
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Width = width,
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Height = height,
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BPP = bpp,
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ImageType = image_type,
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ColormapType = colormap_type,
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ColormapOffset = colormap_offset,
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ColormapFirst = colormap_first,
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ColormapLength = colormap_length,
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ColormapDepth = colormap_depth,
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Descriptor = descriptor,
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};
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}
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}
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}
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}
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