Do the recalculation of the content dimensions in switchSurface if the
current cdx is zero as well as if the new surface is a different size to
the current window. This catches the case where the first surface registered
happens to be 640x480 (our current window size), and fixes a bug where we
would always display a black screen until the first surface of a different
size was registered.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1403516125-14568-2-git-send-email-peter.maydell@linaro.org