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split indexed image reader into separate method.

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morkt 2015-03-16 05:31:03 +04:00
parent 8111f52541
commit 2b973c0bd6
1 changed files with 38 additions and 28 deletions
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66
ArcFormats/ImageDRG.cs
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@ -91,41 +91,51 @@ namespace GameRes.Formats.DRS
public override ImageData Read (Stream file, ImageMetaData info)
{
PixelFormat format;
BitmapPalette bitmap_palette = null;
int stride = (int)info.Width*((info.BPP+7)/8);
BitmapSource bitmap;
if (8 == info.BPP)
{
file.Position = 44;
format = PixelFormats.Indexed8;
var palette_data = new byte[0x400];
if (palette_data.Length != file.Read (palette_data, 0, palette_data.Length))
throw new InvalidFormatException();
var palette = new Color[256];
for (int i = 0; i < 256; ++i)
{
palette[i] = Color.FromRgb (palette_data[i*4+2], palette_data[i*4+1], palette_data[i*4]);
}
bitmap_palette = new BitmapPalette (palette);
file.Position += 4;
/* indexed GGD image is a LZSS-compressed stream */
/* currently not implemented */
}
bitmap = ReadIndexed (file, info);
else
bitmap = ReadTrue (file, info);
bitmap.Freeze();
return new ImageData (bitmap, info);
}
private BitmapSource ReadIndexed (Stream file, ImageMetaData info)
{
file.Position = 44;
PixelFormat format = PixelFormats.Indexed8;
var palette_data = new byte[0x400];
if (palette_data.Length != file.Read (palette_data, 0, palette_data.Length))
throw new InvalidFormatException();
var palette = new Color[256];
for (int i = 0; i < 256; ++i)
{
file.Position = 8;
if (24 == info.BPP)
format = PixelFormats.Bgr24;
else
format = PixelFormats.Bgr565;
palette[i] = Color.FromRgb (palette_data[i*4+2], palette_data[i*4+1], palette_data[i*4]);
}
var bitmap_palette = new BitmapPalette (palette);
file.Position += 4;
int stride = (int)info.Width*((info.BPP+7)/8);
/* indexed GGD image is a LZSS-compressed stream */
/* currently not implemented */
throw new NotImplementedException ("DrgFormat.ReadIndexed not implemented");
}
private BitmapSource ReadTrue (Stream file, ImageMetaData info)
{
file.Position = 8;
PixelFormat format;
if (24 == info.BPP)
format = PixelFormats.Bgr24;
else
format = PixelFormats.Bgr565;
int stride = (int)info.Width*((info.BPP+7)/8);
var pixel_data = DecodeStream (file, stride*(int)info.Height);
if (null == pixel_data)
throw new InvalidFormatException();
var bitmap = BitmapSource.Create ((int)info.Width, (int)info.Height, 96, 96,
format, bitmap_palette, pixel_data, (int)stride);
bitmap.Freeze();
return new ImageData (bitmap, info);
return BitmapSource.Create ((int)info.Width, (int)info.Height, 96, 96,
format, null, pixel_data, stride);
}
byte[] DecodeStream (Stream input, int pixel_count)