public static SolidRun FirstSolidRun(IEnumerable <SpriteByte> open)
{
bool trigger = false;
SpriteByte first = default(SpriteByte);
SpriteByte last = default(SpriteByte);
foreach (var item in open)
{
if (item.Mask == 0x00 && !trigger)
{
first = item;
trigger = true;
}
if ((item.Mask != 0x00 || (item.Offset - last.Offset) > 1) && trigger)
{
return(new SolidRun(first, last));
}
last = item;
}
// If we get to the end and are still solid, great
if (last.Mask == 0x00 && trigger)
{
return(new SolidRun(first, last));
}
return(null);
}
private bool AreEquivalent(SpriteByte left, SpriteByte right)
{
// Return true if the two bytes are in an equivalence class
return
// The have to be adjacent
(((right.Offset - left.Offset) == 1) &&
(
// First case: Both bytes are solid
((left.Mask == 0x00) && (right.Mask == 0x00)) ||
// Second case: Both bytes are masked
((left.Mask != 0x00) && (right.Mask != 0x00))
));
}
public EIGHT_BIT_STORE(SpriteByte data)
{
this.data = data;
}
public SolidRun(SpriteByte first, SpriteByte last)
{
this.first = first;
this.last = last;
}
