void SRRasterization::LineBres(int x0, int y0, SRVertex vertex0, int xEnd, int yEnd, SRVertex vertex1)
{
int dx = abs(xEnd - x0), dy = abs(yEnd - y0);
int p = 2 * dy - dx;
int twoDy = 2 * dy, twoDyMinusDx = 2 * (dy - dx);
int x, y;
if (x0 > xEnd)
{
x = xEnd;
y = yEnd;
xEnd = x0;
}
else
{
x = x0;
y = y0;
}
HandleFragment(x0, y0, vertex0, xEnd, yEnd, vertex1, x, y);
while (x < xEnd)
{
x++;
if (p < 0)
{
p += twoDy;
}
else
{
y++;
p += twoDyMinusDx;
}
HandleFragment(x0, y0, vertex0, xEnd, yEnd, vertex1, x, y);
}
}
ThreadError HandleExtensionHeaders(Message &message, uint8_t &nextHeader, bool receive)
{
ThreadError error = kThreadError_None;
ExtensionHeader extensionHeader;
while (receive == true || nextHeader == kProtoHopOpts)
{
VerifyOrExit(message.GetOffset() <= message.GetLength(), error = kThreadError_Drop);
message.Read(message.GetOffset(), sizeof(extensionHeader), &extensionHeader);
switch (nextHeader)
{
case kProtoHopOpts:
SuccessOrExit(error = HandleOptions(message));
break;
case kProtoFragment:
SuccessOrExit(error = HandleFragment(message));
break;
case kProtoDstOpts:
SuccessOrExit(error = HandleOptions(message));
break;
case kProtoIp6:
case kProtoRouting:
case kProtoNone:
ExitNow(error = kThreadError_Drop);
default:
ExitNow();
}
nextHeader = extensionHeader.GetNextHeader();
}
exit:
return error;
}