public void ScrollHV(BitmapBits destination, int dstY, int srcY, params int[] srcX)
{
if (dstY < 0 || dstY >= destination.Height)
{
return;
}
for (int i = 0; i < srcX.Length; i++)
{
srcX[i] %= Width;
if (srcX[i] < 0)
{
srcX[i] += Width;
}
}
srcY %= Height;
if (srcY < 0)
{
srcY += Height;
}
int rowSrc = GetPixelIndex(0, srcY);
int rowDst = destination.GetPixelIndex(0, dstY);
for (int y = 0; y < destination.Height - dstY; y++)
{
int amount = srcX[(srcY + y) % srcX.Length];
Array.Copy(Bits, rowSrc + amount, destination.Bits, rowDst, Math.Min(Width - amount, destination.Width));
if (amount != 0 && Width - amount < destination.Width)
{
Array.Copy(Bits, rowSrc, destination.Bits, rowDst + Width - amount, Math.Min(amount, destination.Width - (Width - amount)));
}
rowSrc = (rowSrc + Width) % Bits.Length;
rowDst += destination.Width;
}
}
public void DrawBitmapBounded(BitmapBits source, int x, int y)
{
if (x >= 0 && y >= 0 && x + source.Width <= Width && y + source.Height <= Height)
{
DrawBitmap(source, x, y);
return;
}
int srct = 0;
if (y < 0)
{
srct = -y;
}
int srcb = source.Height;
if (srcb > Height - y)
{
srcb = Height - y;
}
if (x == 0 && source.Width == Width)
{
Array.Copy(source.Bits, source.GetPixelIndex(0, srct), Bits, GetPixelIndex(0, y + srct), GetPixelIndex(0, srcb - srct));
return;
}
int srcl = 0;
if (x < 0)
{
srcl = -x;
}
int srcr = source.Width;
if (srcr > Width - x)
{
srcr = Width - x;
}
for (int c = srct; c < srcb; c++)
{
Array.Copy(source.Bits, source.GetPixelIndex(srcl, c), Bits, GetPixelIndex(x + srcl, y + c), srcr - srcl);
}
}
