Le samedi 21 juin 2014 à 11:05 -0400, Paul Davis a écrit : > > > > On Sat, Jun 21, 2014 at 10:35 AM, Jean Brefort > <jean.bref...@normalesup.org> wrote: > In gnumeric this arised when we draw an animated rectangle > around the > selected rectangle. When using the draw event, we need to > repaint > everything inside the rectangle and this made gnumeric quite > unresponsive when there were many cells displayed at once. > > > i don't believe that this is true, but thanks for the explanation. > > > A draw/expose event contains a list of rectangles which need not be > contiguous. It is only a matter of convenience to use the GdkRectangle > that is also supplied. You can invalidate the "border" around the > cell. We do this in ardour, especially in our new canvas, where we > frequently queue discontiguous areas of the screen for drawing - when > we render we do not draw the union of all these areas, just each > rectangle in the list of regions. > I know that an expose event contains a region, but this does not help, we use the draw event, and I don't know how to reliably access the region. More, it is not really easy to determine what needs to be redrawn from inside a draw event.
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