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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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6
CHANGES
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@ -5011,7 +5011,11 @@ Version 1.7.0beta51 [February 17, 2015]
with a method that prevents overflow and does not increase cpu usage
significantly.
Version 1.7.0beta52 [February 17, 2015]
Version 1.7.0beta52 [February 18, 2015]
Added information about setjmp/simplified API interaction in the
manual page and INSTALL file. Added information about using
row_pointers with a single height*width*bpp allocated block
to the manual page.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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11
libpng-manual.txt
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@ -1185,13 +1185,10 @@ 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).

11
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).

2
libpngpf.3
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@ -1,4 +1,4 @@
.TH LIBPNGPF 3 "February 17, 2015"
.TH LIBPNGPF 3 "February 18, 2015"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta52
(private functions)