A Simple, 2d cross-platform graphics library for c or c++? [closed]
Am I missing something to wonder why noone suggests OpenGL? To use it for 2d would be very simple. The OP only wants to color a pixel. It doesn't get simpler than glBegin/glColor/glVertex/glEnd.
[In no particular order.] However, if you have any other requirements, let us know. BTW: I am not just posting results of a Google query here, I have used all of these (and SDL -- wrote my first few games in SDL :) and I'd say without a set of requirements, it's very difficult to choose among the ones listed.