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After all of the windows have already been drawn, the only pieces of information we have available are the size and position of the video window's canvas.
A third piece of information is required to indicate which parts of the video window's canvas are obscured by other windows and which are not.
In order for this to work, three things have to come together: Most modern video controllers provide the functions required for XVideo; this feature is known as hardware scaling and YUV acceleration or sometimes as 2D hardware acceleration.
Welcome to USA X TUBE dot Com - Big collection of 101% free porn tube videos Bookmark our site right now (Ctrl D) and return back again for more hot porn videos! When the video stream is added to the output, the graphics card can simply scan the co-ordinates of the canvas.When it encounters green, it knows it has found a visible portion of the video window, and only draws those portions of the video.Other compositing window managers such as Compiz also use compositing.However, on a system with limited Open GL acceleration function, specifically the lack of an Open GL Framebuffer Object or pbuffer, the use of an Open GL environment like Xgl makes xv hardware accelerations impossible.