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(PicFormat.Read): use LzssStream.

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This commit is contained in:
morkt 2015-07-07 11:30:50 +04:00
parent e193a4de91
commit 859c9dcbdf
1 changed files with 24 additions and 18 deletions
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42
ArcFormats/ImageGS.cs
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@ -62,6 +62,8 @@ namespace GameRes.Formats.Gs
info.PackedSize = input.ReadUInt32(); info.PackedSize = input.ReadUInt32();
info.UnpackedSize = input.ReadUInt32(); info.UnpackedSize = input.ReadUInt32();
info.HeaderSize = input.ReadUInt32(); info.HeaderSize = input.ReadUInt32();
if (info.HeaderSize >= stream.Length || info.PackedSize + info.HeaderSize > stream.Length)
return null;
input.ReadUInt32(); input.ReadUInt32();
info.Width = input.ReadUInt32(); info.Width = input.ReadUInt32();
info.Height = input.ReadUInt32(); info.Height = input.ReadUInt32();
@ -77,45 +79,37 @@ namespace GameRes.Formats.Gs
throw new ArgumentException ("PicFormat.Read should be supplied with PicMetaData", "info"); throw new ArgumentException ("PicFormat.Read should be supplied with PicMetaData", "info");
stream.Position = meta.HeaderSize; stream.Position = meta.HeaderSize;
using (var reader = new LzssReader (stream, (int)meta.PackedSize, (int)meta.UnpackedSize)) using (var input = new LzssStream (stream, LzssMode.Decompress, true))
{ {
reader.Unpack();
byte[] pixels = reader.Data;
int stride = (int)meta.Width*((info.BPP+7)/8);
BitmapPalette palette = null; BitmapPalette palette = null;
PixelFormat format; PixelFormat format;
if (8 == meta.BPP) // read palette if (8 == meta.BPP) // read palette
{ {
format = PixelFormats.Indexed8; format = PixelFormats.Indexed8;
var color_data = new Color[256]; palette = ReadPalette (input);
for (int i = 0; i < 256; ++i)
color_data[i] = Color.FromRgb (pixels[i*4+2], pixels[i*4+1], pixels[i*4]);
palette = new BitmapPalette (color_data);
var image = new byte[meta.Width*meta.Height];
Buffer.BlockCopy (pixels, 0x400, image, 0, image.Length);
pixels = image;
} }
else if (24 == meta.BPP) else if (24 == meta.BPP)
format = PixelFormats.Bgr24; format = PixelFormats.Bgr24;
else if (16 == meta.BPP) else if (16 == meta.BPP)
format = PixelFormats.Bgr565; format = PixelFormats.Bgr565;
else else
format = PixelFormats.Bgr32;
int stride = (int)meta.Width*((info.BPP+7)/8);
var pixels = new byte[stride*meta.Height];
input.Read (pixels, 0, pixels.Length);
if (32 == meta.BPP)
{ {
bool has_opaque = false;
for (int i = 3; i < pixels.Length; i += 4) for (int i = 3; i < pixels.Length; i += 4)
{ {
if (0 != pixels[i]) if (0 != pixels[i])
{ {
has_opaque = true; format = PixelFormats.Bgra32;
break; break;
} }
} }
format = has_opaque ? PixelFormats.Bgra32 : PixelFormats.Bgr32;
} }
var bitmap = BitmapSource.Create ((int)meta.Width, (int)meta.Height, 96, 96, return ImageData.Create (meta, format, palette, pixels);
format, palette, pixels, stride);
bitmap.Freeze();
return new ImageData (bitmap, meta);
} }
} }
@ -123,5 +117,17 @@ namespace GameRes.Formats.Gs
{ {
throw new NotImplementedException ("PicFormat.Write not implemented"); throw new NotImplementedException ("PicFormat.Write not implemented");
} }
private static BitmapPalette ReadPalette (Stream input)
{
var colors = new byte[0x400];
if (colors.Length != input.Read (colors, 0, colors.Length))
throw new InvalidFormatException();
var color_data = new Color[0x100];
int n = 0;
for (int i = 0; i < 0x400; i += 4)
color_data[n++] = Color.FromRgb (colors[i+2], colors[i+1], colors[i]);
return new BitmapPalette (color_data);
}
} }
} }