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Reenable filter selection (dummy)

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This implements the code for row-by-row filter selection but does not provide an
actual implementation; the selection function just chooses the lowest set filter
bit.

Signed-off-by: John Bowler <jbowler@acm.org>
This commit is contained in:
John Bowler
2016-05-09 13:08:50 -07:00
parent ba356b4e4d
commit 4905ed4aae
5 changed files with 458 additions and 337 deletions
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6
png.h
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@@ -1692,9 +1692,9 @@ PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action,
* when there is no previous row.
*
* 2) PNG_SELECT_FILTER_SUPPORTED:
* libpng will buffer rows until enough data is available to perform a
* reasonable filter selection heuristic then select filters for at least the
* first buffered row.
* If the PNG rows are long enough (have enough bytes; at least 256) libpng
* will buffer each row and perform a filter selection heuristic to chose an
* appropriate filter.
*
* 3) !PNG_SELECT_FILTER_SUPPORTED:
* libpng selects the first filter in the list (there is no warning that this