void DoReturn(IGifValue returnValue)
{
if (stack.Count == 0)
{
halted = true;
return;
}
else
{
GifStackFrame returnFrame = stack.Pop();
runningRegister = returnFrame.runningRegister;
switch (returnFrame.RHSInstruction)
{
case 0xCCC: // Assign
bool failure;
returnValue.Write(returnFrame.LHSValue.Read(), out failure);
if (failure)
{
DoReturn(returnValue);
}
break;
case 0xC8C: // Call
stack.Push(new GifStackFrame(returnFrame.runningRegister));
current = returnFrame.LHSValue;
runningRegister = returnValue.Read();
break;
case 0xCC4: // Retarget
ColorRGB lhsColor = returnFrame.LHSValue.Read();
ColorRGB rhsColor = returnValue.Read();
registerTargets[rhsColor.R16, rhsColor.G16, rhsColor.B16] = registerTargets[lhsColor.R16, lhsColor.G16, lhsColor.B16];
current = new GifCursor(rhsColor, GetRegisterPosition(rhsColor), GetRegisterTarget(rhsColor));
break;
default:
break;
}
}
}
void DrawGifValue(IGifValue value, Vector2 pos, Vector2 size)
{
if (value is GifCursor)
{
GifCursor cursor = (GifCursor)value;
DrawCell(cursor.cube, cursor.position.R16, cursor.position.G16, cursor.position.B16, pos, size);
}
else
{
DrawColorBlock(value.Read(), pos, size);
}
}