public Pixbuf (Colorspace colorspace, bool has_alpha, int bits_per_sample, int width, int height)
Creates a new `GdkPixbuf` structure and allocates a buffer for it.
If the allocation of the buffer failed, this function will return `NULL`.
The buffer has an optimal rowstride. Note that the buffer is not cleared; you will have to fill it completely yourself.
Color space for image
Whether the image should have transparency information
Number of bits per color sample
Width of image in pixels, must be > 0
Height of image in pixels, must be > 0
A newly-created pixel buffer