On 7/26/05, Przemysław Więckowski <[EMAIL PROTECTED]> wrote: > Could you please tell me. What would be faster: directly putting > prepared pixmap using gdk_draw_drawable(..) as rectangle or drawing > rectangle using gdk_draw_rectangle(..)?? ( i heve't tested it so i ask...)
Your choices are: 1) draw to a pixmap, then send the pixmap to the screen 2) draw to the screen Either way you have to do the drawing, so 1) will (almost) always be slower. In fact when you do 2), gtk does 1) for you because it does automatic double-buffering. When an expose event comes in from the window system, gtk adds the exposed area to the queue of drawing events to do for that window. When gtk delivers "expose_event" to your code, it calculates the bounding box of all the repaints in the queue, allocates an off-screen pixmap large enough, and calls "expose_event" with drawing pointing at the off-screen pixmap. After your expose handler finishes, gtk copies the offscreen pixmap to the display. This way you don't get any flashing of the display during repaint. You can ask gtk not to double-buffer your drawing area, but it will make your code more complicated and the speed-up you get by turning double-buffering off may not be significant. John
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