void init(RawImage img, uint x, uint y)
{
if (img == null)
{
throw new ArgumentNullException("img");
}
uint bw = Math.Min(img.Width - x, 4U);
uint bh = Math.Min(img.Height - y, 4U);
if (bw == 0 || bh == 0)
{
throw new InvalidOperationException("bw and bh have to be > 0)");
}
uint[] remainder =
{
0, 0, 0, 0,
0, 1, 0, 1,
0, 1, 2, 0,
0, 1, 2, 3
};
// Blocks that are smaller than 4x4 are handled by repeating the pixels.
// @@ Thats only correct when block size is 1, 2 or 4, but not with 3. :(
for (uint i = 0; i < 4; i++)
{
//const int by = i % bh;
uint by = remainder[(bh - 1) * 4 + i];
for (uint e = 0; e < 4; e++)
{
//const int bx = e % bw;
uint bx = remainder[(bw - 1) * 4 + e];
Data[i * 4 + e] = img.Pixel(x + bx, y + by);
}
}
}
void init(RawImage img, uint x, uint y)
{
if (img == null)
throw new ArgumentNullException("img");
uint bw = Math.Min(img.Width - x, 4U);
uint bh = Math.Min(img.Height - y, 4U);
if (bw == 0 || bh == 0)
throw new InvalidOperationException("bw and bh have to be > 0)");
uint[] remainder = {
0, 0, 0, 0,
0, 1, 0, 1,
0, 1, 2, 0,
0, 1, 2, 3 };
// Blocks that are smaller than 4x4 are handled by repeating the pixels.
// @@ Thats only correct when block size is 1, 2 or 4, but not with 3. :(
for (uint i = 0; i < 4; i++)
{
//const int by = i % bh;
uint by = remainder[(bh - 1) * 4 + i];
for (uint e = 0; e < 4; e++)
{
//const int bx = e % bw;
uint bx = remainder[(bw - 1) * 4 + e];
Data[i * 4 + e] = img.Pixel(x + bx, y + by);
}
}
}
