png_set_progressive_read_fn
Name
png_set_progressive_read_fn -- set progressive read callback functions
Synopsis
void
png_set_progressive_read_fn
(png_structp
png_ptr, png_voidp
user_ptr, png_progressive_info_ptr
info_callback, png_progressive_row_ptr
row_callback, png_progressive_end_ptr
end_callback);
Description
png_set_progressive_read_fn() shall provide function callbacks for which shall
be called for processing image data by png_process_data(). "info_callback" shall
be called to process header information, "row_callback" shall be called when
each row is completed and "end_callback" shall be called to process end of image
information. png_set_progressive_read_fn() must be called even if all callback
functions are NULL. The user-defined structure pointed to by "user_ptr" may be
retrieved from inside the callbacks using function get_progressive_ptr().