package cairo2
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The PNG functions allow reading PNG images into image surfaces, and writing any surface to a PNG file.
To create a new PNG file, start by creating an image surface, providing its format (see Image.format) and dimensions w×h with let surface = Cairo.Image.create format w h. From this you can create a Cairo context to do your drawing: let cr =
Cairo.create surface. Then, when you are done, call Cairo.PNG.write surface fname to write the surface to the PNG file fname.
val create : string -> Surface.tcreate filename creates a new image surface and initializes the contents to the given PNG file.
val create_from_stream : input:(string -> int -> unit) -> Surface.tCreates a new image surface from PNG data read incrementally via the input function. The input s l function receives a string s whose first l bytes must be filled with PNG data. Any exception raised by input is considered as a read error.
val write : Surface.t -> string -> unitwrite surface filename writes the contents of surface to a new file filename as a PNG image.
val write_to_stream : Surface.t -> output:(string -> unit) -> unitWrites the image surface using the output function.