protected unsafe override void OnRender(Rectangle[] rois, int startIndex, int length)
{
Surface dst = DstArgs.Surface;
int maxX = dst.Width - 1;
int maxY = dst.Height - 1;
for (int r = startIndex; r < startIndex + length; ++r)
{
Rectangle rect = rois[r];
for (int y = rect.Top; y < rect.Bottom; ++y)
{
ColorBgra *dstPtr = dst.GetPointAddressUnchecked(rect.Left, y);
float brightness = (float)y / maxY;
for (int x = rect.Left; x < rect.Right; ++x)
{
float hue = x * 360.0f / maxX;
*dstPtr++ = ColorBgraExt.FromAhsl(1.0f, hue, 0.5f, brightness);
}
}
}
}
protected unsafe override void OnRender(Rectangle[] rois, int startIndex, int length)
{
Surface dst = DstArgs.Surface;
int maxX = dst.Width - 1;
int maxY = dst.Height - 1;
int bands = 8;
for (int r = startIndex; r < startIndex + length; ++r)
{
Rectangle rect = rois[r];
for (int y = rect.Top; y < rect.Bottom; ++y)
{
ColorBgra *dstPtr = dst.GetPointAddressUnchecked(rect.Left, y);
int band = Math.DivRem(y * bands + maxY - 1, maxY, out int rem);
float saturation = (float)rem / maxY;
for (int x = rect.Left; x < rect.Right; ++x)
{
float hue = x * 360.0f / maxX;
*dstPtr++ = ColorBgraExt.FromAhsl(1.0f, hue, 1.0f - saturation, (float)band / bands);
}
}
}
}
