const func PRIMITIVE_WINDOW: readPng (inout file: pngFile)

Reads a PNG file into a pixmap.

Parameters:

pngFile - File that contains a PNG image.

Returns:

A pixmap with the PNG image, or PRIMITIVE_WINDOW.value if the file does not contain a PNG magic number.

Raises:

RANGE_ERROR - The file is not in the PNG file format.

const func PRIMITIVE_WINDOW: readPng (in string: pngFileName)

Reads a PNG file with the given pngFileName into a pixmap.

Parameters:

pngFileName - Name of the PNG file.

Returns:

A pixmap with the PNG image, or PRIMITIVE_WINDOW.value if the file cannot be opened or does not contain a PNG magic number.

Raises:

RANGE_ERROR - The file is not in the PNG file format.

const func string: str (in PRIMITIVE_WINDOW: pixmap, PNG)

Converts a pixmap into a string in PNG format.

Parameters:

pixmap - Pixmap to be converted.

Returns:

a string with data in PNG format.