Module: png

The png module provides a wrapper for the libpng image library. It imports and exports Portable Network Graphics (PNG) images to textures and allows the user to take screenshots.

Functions in this module:

Function	Short Description
(png-width fname)	Returns the width of a PNG file.
(png-height fname)	Returns the height of a PNG file.
(png-depth fname)	Returns the color depth (bits per pixel) of a PNG file.
(png-stride fname)	Returns the stride (bytes per pixel) of a PNG file.
(screenshot->png fname)	Saves a screenshot to file.
(png->img fname)	Returns a loaded PNG file as an image texture.
(img->png img fname)	Saves an image texture as a PNG file.
(png->u8vector fname . xargs)	Returns a loaded PNG file as an u8vector.
(u8vector->png data fname w h)	Saves an u8vector as a PNG file.