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(WebP): ported lossless support (incomplete).

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This commit is contained in:
morkt
2016-09-04 04:50:49 +04:00
parent e2a0d76b65
commit bc62faa71a
3 changed files with 135 additions and 16 deletions
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25
ArcFormats/WebP/ImageWEBP.cs
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@@ -35,6 +35,7 @@ namespace GameRes.Formats.Google
{
public WebPFeature Flags;
public bool IsLossless;
public bool HasAlpha;
public long DataOffset;
public int DataSize;
public long AlphaOffset;
@@ -102,12 +103,24 @@ namespace GameRes.Formats.Google
{
if (chunk_size < 10 || 10 != stream.Read (header, 0, 10))
return null;
if (header[3] != 0x9D || header[4] != 1 || header[5] != 0x2A)
return null;
if (0 != (header[0] & 1)) // not a keyframe
return null;
info.Width = LittleEndian.ToUInt16 (header, 6) & 0x3FFFu;
info.Height = LittleEndian.ToUInt16 (header, 8) & 0x3FFFu;
if (info.IsLossless)
{
if (header[0] != 0x2F || (header[4] >> 5) != 0)
return null;
uint wh = LittleEndian.ToUInt32 (header, 1);
info.Width = (wh & 0x3FFFu) + 1;
info.Height = ((wh >> 14) & 0x3FFFu) + 1;
info.HasAlpha = 0 != (header[4] & 0x10);
}
else
{
if (header[3] != 0x9D || header[4] != 1 || header[5] != 0x2A)
return null;
if (0 != (header[0] & 1)) // not a keyframe
return null;
info.Width = LittleEndian.ToUInt16 (header, 6) & 0x3FFFu;
info.Height = LittleEndian.ToUInt16 (header, 8) & 0x3FFFu;
}
}
break;
}