John Bowler 0a5c9c02fa [devel] Corrected const_png_ in png.h to png_const_ to avoid polluting ...

the namespace.  Added png_get_current_row_number and
 png_get_current_pass_number for the
 benefit of the user transform callback.
 Added png_process_data_pause and png_process_data_skip for the benefit of
 progressive readers that need to stop data processing or want to optimize
 skipping of unread data (e.g. if the reader marks a chunk to be skipped.)

2011-01-22 17:36:34 -06:00

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