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

pointer usage.

CHANGES

@@ -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.
 
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libpng-manual.txt

@@ -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
+row_pointers[i] to point into the proper places in your block.  If
-extra memory after the last row to leave working room for reading the
+you do this, be sure to call png_read_update_info() described below,
-entire row if you are doing reductions such as 16-to-8 or rgb-to-gray.
+to update the "rowbytes" value to account for any transformations that
-In the worst case, reducing 16-bit RGBA to 8-bit gray, you'd need to
+change the number of bytes per row before you use it to allocate your block.
-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).
 
 If you use png_set_rows(), the application is responsible for freeing
 row_pointers (and row_pointers[i], if they were separately allocated).

libpng.3

@@ -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
+row_pointers[i] to point into the proper places in your block.  If
-extra memory after the last row to leave working room for reading the
+you do this, be sure to call png_read_update_info() described below,
-entire row if you are doing reductions such as 16-to-8 or rgb-to-gray.
+to update the "rowbytes" value to account for any transformations that
-In the worst case, reducing 16-bit RGBA to 8-bit gray, you'd need to
+change the number of bytes per row before you use it to allocate your block.
-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).
 
 If you use png_set_rows(), the application is responsible for freeing
 row_pointers (and row_pointers[i], if they were separately allocated).

libpngpf.3

@@ -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)