Follow-up Comment #4, patch #1141 (project wesnoth):
You're right, what I was saying about SDL rectangles didn't really make any
sense.
Doing some testing, it seems that it is very slow when we have the rectangle
{0, 0, w, h}. I do not know why. Making it a pixel smaller in any direction
makes it fast... odd. To give you an idea, when scrolling, setting the w and
h correctly gives ~15fps, just doing an SDL_Flip gives ~30fps and having a
special case that handles the full-screen rectangle and shrinks it 1 pixel
gives ~40 fps. (a special case that signals to do an SDL_Flip when it sees
that rectangle is just as bad as sending the rectangle)
I have no idea why this is.
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