New Functions List

This section has the list of all of all the public functions added to libpng to support reading and writing animated images.



void png_read_frame_head(png_structp png_ptr, png_infop info_ptr);

This function must be called before reading the image data of every frame in a PNG image with an acTl chunk. After calling it, the next frame fcTl will have data for the next frame.


void png_set_progressive_frame_fn(png_structp png_ptr, png_progressive_frame_ptr frame_info_fn, png_progressive_frame_ptr frame_end_fn);

Sets up the function to be called when the info about a frame has been read (just before the frame's pixel data starts).

The callbacks must match this signature:

void frame_fn(png_structp png_ptr, png_uint_32 frame_num);

Eiter of the frame_info_fn and the frame_end_fn paremeters can be NULL.