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[devel] Corrected const_png_ in png.h to png_const_ to avoid polluting

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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.)
This commit is contained in:
John Bowler
2011-01-22 17:36:34 -06:00
committed by Glenn Randers-Pehrson
parent 155ce40218
commit 0a5c9c02fa
14 changed files with 386 additions and 231 deletions
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4
scripts/pnglibconf.dfa
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@@ -380,8 +380,10 @@ option WRITE_WEIGHTED_FILTER requires WRITE
option WRITE_FLUSH requires WRITE
# Note: this can be turned off explicitly, is this correct?
# Note: these can be turned off explicitly if not required by the
# apps implementing the user transforms
option USER_TRANSFORM_PTR if READ_USER_TRANSFORM WRITE_USER_TRANSFORM
option USER_TRANSFORM_INFO if READ_USER_TRANSFORM WRITE_USER_TRANSFORM
# Any chunks you are not interested in, you can undef here. The
# ones that allocate memory may be expecially important (hIST,