| public static MemClear ( Byte dest, int destIndex, int count ) : void | ||
| dest | Byte | |
| destIndex | int | |
| count | int | |
| return | void | |
public void combine_hspan(int x, int y, byte[] buffer, int bufferIndex, int num_pix)
{
int xmax = (int)m_rbuf.Width - 1;
int ymax = (int)m_rbuf.Height - 1;
int count = num_pix;
byte[] covers = buffer;
int coversIndex = bufferIndex;
if (y < 0 || y > ymax)
{
AggMemMx.MemClear(buffer, bufferIndex, num_pix);
return;
}
if (x < 0)
{
count += x;
if (count <= 0)
{
AggMemMx.MemClear(buffer, bufferIndex, num_pix);
return;
}
AggMemMx.MemClear(covers, coversIndex, -x);
coversIndex -= x;
x = 0;
}
if (x + count > xmax)
{
int rest = x + count - xmax - 1;
count -= rest;
if (count <= 0)
{
AggMemMx.MemClear(buffer, bufferIndex, num_pix);
return;
}
AggMemMx.MemClear(covers, coversIndex + count, rest);
}
int maskIndex = m_rbuf.GetBufferOffsetXY(x, y);
byte[] mask = m_rbuf.GetBuffer();
unsafe
{
fixed(byte *maskHead = &mask[maskIndex])
fixed(byte *coverHead = &covers[coversIndex])
{
byte *c_mask_index = maskHead;
byte *c_cover_index = coverHead;
do
{
*c_cover_index = (byte)((*c_cover_index * (*c_mask_index) + 255) >> 8);
c_cover_index++;
c_mask_index++;
}while (--count != 0);
}
}
}
public void combine_hspanFullCover(int x, int y, byte[] covers, int coversIndex, int num_pix)
{
int xmax = (int)m_rbuf.Width - 1;
int ymax = (int)m_rbuf.Height - 1;
int count = num_pix;
if (y < 0 || y > ymax)
{
AggMemMx.MemClear(covers, coversIndex, num_pix);
return;
}
if (x < 0)
{
count += x;
if (count <= 0)
{
AggMemMx.MemClear(covers, coversIndex, num_pix);
return;
}
AggMemMx.MemClear(covers, coversIndex, -x);
coversIndex -= x;
x = 0;
}
if (x + count > xmax)
{
int rest = x + count - xmax - 1;
count -= rest;
if (count <= 0)
{
AggMemMx.MemClear(covers, coversIndex, num_pix);
return;
}
AggMemMx.MemClear(covers, coversIndex + count, rest);
}
int maskIndex = m_rbuf.GetByteBufferOffsetXY(x, y);
unsafe
{
TempMemPtr maskPtr = m_rbuf.GetBufferPtr();
byte * mask = (byte *)maskPtr.Ptr;
do
{
covers[coversIndex++] = mask[maskIndex++];
}while (--count != 0);
maskPtr.Release();
}
}
