sinc function = sin(x*pi)/(x*pi)

This does some sanity checking on the rubber band rectangle before creating it. Rubber bands with width or height zero or extremely large appear to ca

This function calculates window function values based on cubic interpolation (Catmull-Rom spline).

Tries to find the real window that corresponds to a top-level window (the actual window without window manager decorations). Returns None if it can't

clears a rectangular area of an image (i.e. sets the memory to zero, which will most likely make the image black)

Draws the current cursor at the current position on the image. Requires XFixes. Note: In the original code from x11grab, the variables for red and blu

Converts a X11 image format to a format that libav/ffmpeg understands.

simple function to do 16-byte alignment