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(Legacy): fixed FB images decoder.

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This commit is contained in:
morkt 2018-12-19 03:35:32 +04:00
parent eb72b78b45
commit d75bc26cbc
1 changed files with 18 additions and 20 deletions
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38
Legacy/Akatombo/ImageFB.cs
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@ -46,7 +46,7 @@ namespace GameRes.Formats.Akatombo
return new ImageMetaData {
Width = header.ToUInt16 (4),
Height = header.ToUInt16 (6),
BPP = header.ToUInt16 (2),
BPP = header[2],
};
}
@ -54,7 +54,7 @@ namespace GameRes.Formats.Akatombo
{
var reader = new FbReader (file, info);
var pixels = reader.Unpack();
return ImageData.Create (info, reader.Format, null, pixels);
return ImageData.CreateFlipped (info, reader.Format, null, pixels, reader.Stride);
}
public override void Write (Stream file, ImageData image)
@ -67,17 +67,17 @@ namespace GameRes.Formats.Akatombo
{
IBinaryStream m_input;
int m_width;
int m_pixel_count;
byte[] m_output;
public PixelFormat Format { get; private set; }
public int Stride { get; private set; }
public FbReader (IBinaryStream input, ImageMetaData info)
{
m_input = input;
m_width = (int)info.Width;
m_pixel_count = m_width * (int)info.Height;
m_output = new byte[m_pixel_count * 4];
m_width = info.iWidth;
Stride = 4 * m_width;
m_output = new byte[Stride * info.iHeight];
Format = PixelFormats.Bgr32;
}
@ -87,8 +87,7 @@ namespace GameRes.Formats.Akatombo
{
m_input.Position = 8;
m_bits = 0x80000000;
int dst = 0;
for (int i = 0; i < m_pixel_count; ++i)
for (int dst = 0; dst < m_output.Length; dst += 4)
{
int bit = GetNextBit();
if (0 == bit)
@ -105,37 +104,36 @@ namespace GameRes.Formats.Akatombo
m_output[dst ] += ReadDiff();
m_output[dst+1] += ReadDiff();
m_output[dst+2] += ReadDiff();
dst += 4;
}
return m_output;
}
byte ReadDiff ()
{
uint n = 1;
do
int count = 1;
while (GetNextBit() != 0)
{
n = Binary.RotR (n, 1);
++count;
}
while (GetNextBit() != 0);
++n;
byte bit;
do
int n = 1;
while (count --> 0)
{
bit = (byte)GetNextBit();
n = (n << 1) | bit;
n = (n << 1) | GetNextBit();
}
while (0 == bit);
return (byte)(-(n & 1) ^ ((n >> 1) - 1));
}
byte[] m_bits_buffer = new byte[4];
int GetNextBit ()
{
uint bit = m_bits >> 31;
m_bits <<= 1;
if (0 == m_bits)
{
m_bits = Binary.BigEndian (m_input.ReadUInt32());
if (0 == m_input.Read (m_bits_buffer, 0, 4))
throw new EndOfStreamException();
m_bits = BigEndian.ToUInt32 (m_bits_buffer, 0);
bit = m_bits >> 31;
m_bits = (m_bits << 1) | 1;
}