cairo-format-stride-for-width (format width)

format -- a cairo-format-t value
width -- An integer with the desired width of an image surface to be created.

The appropriate stride to use given the desired format and width, or -1 if either the format is invalid or the width too large.

This function provides a stride value that will respect all alignment requirements of the accelerated image-rendering code within Cairo. Typical usage will be of the form:

(let* ((height 150)
       (width 200)
       (stride (cairo-format-stride-for-width :argb32 width))
       (data (g-malloc (* height stride)))
       (surface (cairo-image-surface-create-for-data data
                                                     :argb32
                                                     width height stride)))
  ... )