public SKColor GetPixel(int x, int y, int depth)
{
if (root != null)
{
return(root._getPixel(x, y, depth));
}
return(SKColors.Transparent);
}
//internal int depth;
internal SKColor _getPixel(int x, int y, int depth)
{
if (depth == 1)
{
int i = _pixelIndex(x, y);
if (i >= 0 && i < _pixels.Length)
{
if (_pixels == null)
{
//Scale
/* -------------------
* ------- | chunk0 | chunk1 |
* | SRC | -> |--------|--------|
* ------- | chunk2 | chunk3 |
* -------------------
*/
SKColor Aver(SKColor p0, SKColor p1, SKColor p2, SKColor p3)
{
return(new SKColor(
(byte)((p0.Alpha + p1.Alpha + p2.Alpha + p3.Alpha) >> 2),
(byte)((p0.Red + p1.Red + p2.Red + p3.Red) >> 2),
(byte)((p0.Blue + p1.Blue + p2.Blue + p3.Blue) >> 2),
(byte)((p0.Alpha + p1.Alpha + p2.Alpha + p3.Alpha) >> 2)
));
}
int xcenter = TreeDefs.ChunkWidth / 2;
int ycenter = TreeDefs.ChunkHeight / 2;
int tx, ty;
ScalablePixelTreeNode n;
int index = y * TreeDefs.ChunkWidth;
if (y >= ycenter)
{
ty = (y - ycenter) * 2;
//Chunk 2
if (x < xcenter)
{
tx = x * 2; n = bl;
}
//Chunk 3
else
{
tx = (x - xcenter) * 2; n = br;
}
}
else
{
ty = y * 2;
//Chunk 0
if (x < xcenter)
{
tx = x * 2; n = tl;
}
//Chunk 3
else
{
tx = (x - xcenter) * 2; n = tr;
}
}
return(Aver(
n._getPixel(tx, ty, 1),
n._getPixel(tx + 1, ty, 1),
n._getPixel(tx, ty + 1, 1),
n._getPixel(tx + 1, ty + 1, 1)
));
}
else
{
return(_pixels[i]);
}
}
return(SKColors.Transparent);
}
else if (depth > 1)
{
SKColor get()
{
while (depth > 1)
{
x = x == -1 ? -1 : x / 2; y = y == -1 ? -1 : y / 2;
depth--;
}
int i = _pixelIndex(x, y);
if (i >= 0 && i < _pixels.Length)
{
return(_pixels[i]);
}
return(SKColors.Transparent);
}
if (x >= 0)
{
if (y >= 0)
{
//tr
if (tr == null)
{
return(get());
}
return(tr._getPixel(x - TreeDefs.ChunkWidth / 2, y - TreeDefs.ChunkHeight / 2, depth));
}
else
{
//br
if (br == null)
{
return(get());
}
return(br._getPixel(x - TreeDefs.ChunkWidth / 2, y + TreeDefs.ChunkHeight / 2, depth));
}
}
else
{
if (y >= 0)
{
//tl
if (tl == null)
{
return(get());
}
return(tl._getPixel(x + TreeDefs.ChunkWidth / 2, y - TreeDefs.ChunkHeight / 2, depth));
}
else
{
//bl
if (bl == null)
{
return(get());
}
return(bl._getPixel(x + TreeDefs.ChunkWidth / 2, y + TreeDefs.ChunkHeight / 2, depth));
}
}
}
return(SKColors.Transparent);
}