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[libpng17] Corrected information recently added to the man page about row

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pointer usage.
This commit is contained in:
Glenn Randers-Pehrson
2015-02-17 21:29:22 -06:00
parent ed3543679a
commit f0341bae80
4 changed files with 14 additions and 16 deletions
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libpng.3
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@@ -1679,13 +1679,10 @@ row_pointers prior to calling png_read_png() with
png_set_rows(png_ptr, info_ptr, &row_pointers);
Alternatively you could allocate your image in one big block and define
row_pointers[i] to point into the proper places in your block. Allocate
extra memory after the last row to leave working room for reading the
entire row if you are doing reductions such as 16-to-8 or rgb-to-gray.
In the worst case, reducing 16-bit RGBA to 8-bit gray, you'd need to
allocate seven extra rows worth of memory (you don't need extra memory
for any but the last row, because for other rows the working space just
overlaps the next row(s).
row_pointers[i] to point into the proper places in your block. If
you do this, be sure to call png_read_update_info() described below,
to update the "rowbytes" value to account for any transformations that
change the number of bytes per row before you use it to allocate your block.
If you use png_set_rows(), the application is responsible for freeing
row_pointers (and row_pointers[i], if they were separately allocated).