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[libpng17] Combined sub_row, up_row, avg_row, and paeth_row buffers into a

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single try_row buffer.
This commit is contained in:
Glenn Randers-Pehrson
2015-02-10 17:02:09 -06:00
parent ba22b208ed
commit 8bc832389a
6 changed files with 177 additions and 144 deletions
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14
pngwrite.c
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@@ -942,15 +942,9 @@ png_write_destroy(png_structrp png_ptr)
png_ptr->row_buf = NULL;
#ifdef PNG_WRITE_FILTER_SUPPORTED
png_free(png_ptr, png_ptr->prev_row);
png_free(png_ptr, png_ptr->sub_row);
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
png_free(png_ptr, png_ptr->try_row);
png_ptr->prev_row = NULL;
png_ptr->sub_row = NULL;
png_ptr->up_row = NULL;
png_ptr->avg_row = NULL;
png_ptr->paeth_row = NULL;
png_ptr->try_row = NULL;
#endif
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
@@ -1065,8 +1059,8 @@ png_set_filter(png_structrp png_ptr, int method, int filters)
* it is too late to start using the filters that need it, since we
* will be missing the data in the previous row. If an application
* wants to start and stop using particular filters during compression,
* it should start out with all of the filters, and then add and
* remove them after the start of compression.
* it should start out with all of the filters, and then remove them
* or add them back after the start of compression.
*
* NOTE: this is a nasty constraint on the code, because it means that the
* prev_row buffer must be maintained even if there are currently no