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(TgaFormat): RLE compression implementation.

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morkt 2015-04-19 15:20:17 +04:00
parent f1537bc5af
commit 039eff6f32
1 changed files with 136 additions and 55 deletions
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191
GameRes/ImageTGA.cs
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@ -23,6 +23,7 @@
// IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Text;
using System.Windows;
@ -55,61 +56,12 @@ namespace GameRes
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();
}
var reader = new Reader (stream, meta);
var pixels = reader.Unpack();
var bitmap = BitmapSource.Create ((int)meta.Width, (int)meta.Height, 96, 96,
reader.Format, reader.Palette, pixels, reader.Stride);
bitmap.Freeze();
return new ImageData (bitmap, meta);
}
public override void Write (Stream stream, ImageData image)
@ -220,5 +172,134 @@ namespace GameRes
};
}
}
internal class Reader
{
Stream m_input;
TgaMetaData m_meta;
int m_width;
int m_height;
int m_stride;
byte[] m_data;
long m_image_offset;
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
public int Stride { get { return m_stride; } }
public byte[] Data { get { return m_data; } }
public Reader (Stream stream, TgaMetaData meta)
{
m_input = stream;
m_meta = meta;
switch (meta.BPP)
{
default: throw new InvalidFormatException();
case 8: throw new NotImplementedException();
case 15: Format = PixelFormats.Bgr555; break;
case 16: Format = PixelFormats.Bgr555; break;
case 32: Format = PixelFormats.Bgra32; break;
case 24:
if (8 == (meta.Descriptor & 0xf))
Format = PixelFormats.Bgr32;
else
Format = PixelFormats.Bgr24;
break;
}
int colormap_size = meta.ColormapLength * meta.ColormapDepth / 8;
m_width = (int)meta.Width;
m_height = (int)meta.Height;
m_stride = m_width * ((meta.BPP+7) / 8);
m_image_offset = meta.ColormapOffset;
if (1 == meta.ColormapType)
m_image_offset += colormap_size;
m_data = new byte[m_stride*m_height];
}
public byte[] Unpack ()
{
switch (m_meta.ImageType)
{
case 1: // Uncompressed, color-mapped images.
case 3: // Uncompressed, black and white images.
case 9: // Runlength encoded color-mapped 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 NotImplementedException();
default:
throw new InvalidFormatException();
case 2: // Uncompressed, RGB images.
ReadRGB();
break;
case 10: // Runlength encoded RGB images.
ReadRLE ((m_meta.BPP+7)/8);
break;
}
return Data;
}
void ReadRGB ()
{
m_input.Position = m_image_offset;
if (0 != (m_meta.Descriptor & 0x20))
{
if (m_data.Length != m_input.Read (m_data, 0, m_data.Length))
throw new InvalidFormatException();
}
else
{
for (int row = m_height-1; row >= 0; --row)
{
if (m_stride != m_input.Read (m_data, row*m_stride, m_stride))
throw new InvalidFormatException();
}
}
}
void ReadRLE (int pixel_size)
{
m_input.Position = m_image_offset;
for (int dst = 0; dst < m_data.Length;)
{
int packet = m_input.ReadByte();
if (-1 == packet)
break;
int count = (packet & 0x7f) + 1;
if (0 != (packet & 0x80))
{
if (pixel_size != m_input.Read (m_data, dst, pixel_size))
break;
int src = dst;
dst += pixel_size;
for (int i = 1; i < count && dst < m_data.Length; ++i)
{
Buffer.BlockCopy (m_data, src, m_data, dst, pixel_size);
dst += pixel_size;
}
}
else
{
count *= pixel_size;
if (count != m_input.Read (m_data, dst, count))
break;
dst += count;
}
}
if (0 == (m_meta.Descriptor & 0x20))
{
byte[] flipped = new byte[m_stride*m_height];
int dst = 0;
for (int src = m_stride*(m_height-1); src >= 0; src -= m_stride)
{
Buffer.BlockCopy (m_data, src, flipped, dst, m_stride);
dst += m_stride;
}
m_data = flipped;
}
}
}
}
}