public SpPixels GetSubset(int x, int y, int w, int h)
{
if (w < 0)
{
w = -w;
x -= w;
}
if (h < 0)
{
h = -h;
y -= h;
}
var o = new SpPixels(w, h);
for (var oy = 0; oy < h; oy++)
{
for (var ox = 0; ox < w; ox++)
{
o.SetPixel(ox, oy, GetPixel(ox + x, oy + y));
}
}
return(o);
}
public SpPixels GetFlippedVertically()
{
var o = new SpPixels(width, height);
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
o.SetPixel(x, height - y - 1, GetPixel(x, y));
}
}
return(o);
}
public SpPixels GetFlippedHorizontally()
{
var o = new SpPixels(width, height);
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
o.SetPixel(width - x - 1, y, GetPixel(x, y));
}
}
return(o);
}
public SpPixels GetRotated270()
{
var o = new SpPixels(height, width);
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
o.SetPixel(height - y - 1, x, GetPixel(x, y));
}
}
return(o);
}
public SpPixels GetRotated90()
{
var o = new SpPixels(height, width);
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
var c = GetPixel(x, y);
o.SetPixel(y, width - x - 1, c);
}
}
return(o);
}