void Unpack24bpp()
{
int extra_row = m_output.Length - m_stride;
var rows = new int[3] {
0, extra_row, extra_row
};
var offset_table = OffsetTable.Clone() as int[];
for (int y = 0; y < m_height; ++y)
{
int dst = rows[0];
for (int x = 0; x < m_width;)
{
int ctl = m_input.GetBits(ControlTable1, 13);
if (0xB8 == ctl)
{
ctl += m_input.GetBits(ControlTable2, 13);
}
int pos = m_input.GetBits(PosTable24, 6) * 2;
int x_offset = offset_table[pos];
int y_offset = offset_table[pos + 1];
if (pos > 0)
{
offset_table[pos] = offset_table[pos - 2];
offset_table[pos + 1] = offset_table[pos - 1];
offset_table[pos - 2] = x_offset;
offset_table[pos - 1] = y_offset;
}
int src = rows[y_offset] + (x + x_offset) * 4;
if (ctl >= 0xD8)
{
int count = ctl - 0xD6;
Binary.CopyOverlapped(m_output, src, dst, count * 4);
dst += count * 4;
x += count;
}
else
{
for (int j = 2; j >= 0; --j)
{
byte r = RgbBits[j, ctl];
if (0xFD == r)
{
r = GetDelta(DeltaTable);
}
m_output[dst + j] = (byte)(m_output[src + j] - r);
}
dst += 4;
++x;
}
}
rows[2] = rows[1];
rows[1] = rows[0];
rows[0] += m_stride;
}
}
void Unpack32bpp()
{
for (int i = 3; i < m_stride; i += 4)
{
m_output[i] = 0xFF;
}
var rows = new int[3];
var offset_table = OffsetTable.Clone() as int[];
for (int y = 0; y < m_height; ++y)
{
int dst = rows[0];
for (int x = 0; x < m_width;)
{
int ctl = m_input.GetBits(ControlTable1, 13);
if (0xB8 == ctl)
{
ctl += m_input.GetBits(ControlTable2, 13);
}
int t = m_input.GetBits(ControlTable32, 9) * 2;
int pos = PosTable32[t] * 2;
bool diff_alpha = PosTable32[t + 1] != 0;
int x_offset = offset_table[pos];
int y_offset = offset_table[pos + 1];
if (pos > 0)
{
offset_table[pos] = offset_table[pos - 2];
offset_table[pos + 1] = offset_table[pos - 1];
offset_table[pos - 2] = x_offset;
offset_table[pos - 1] = y_offset;
}
int src = rows[y_offset] + (x + x_offset) * 4;
if (ctl >= 0xD8)
{
int count = ctl - 0xD6;
Binary.CopyOverlapped(m_output, src, dst, count * 4);
dst += count * 4;
x += count;
}
else
{
for (int j = 2; j >= 0; --j)
{
byte r = RgbBits[j, ctl];
if (0xFD == r)
{
r = GetDelta(DeltaTable);
}
m_output[dst + j] = (byte)(m_output[src + j] - r);
}
byte alpha = 0;
if (diff_alpha)
{
alpha = GetDelta(AlphaTable);
}
m_output[dst + 3] = (byte)(m_output[src + 3] - alpha);
dst += 4;
++x;
}
}
rows[2] = rows[1];
rows[1] = rows[0];
rows[0] += m_stride;
}
}