John Bowler e46cd2e6bc Simplified API: use system appropriate types ...

This is an API change for 1.7, albeit a quiet one; it may produce compiler
warnings but should not result in errors, unless warnings are treated as errors.

On 64-bit systems it widens the results of the various PNG_IMAGE_ macros that
return size values (component counts, byte sizes) to 64 bits.  It also changes
the row_stride parameter, which is the pointer difference between adjacent rows
of the image buffer, to ptrdiff_t which is the ANSI-C90 defined type of the
difference of two pointers.  The existing (1.6.22) checks for overflow are
preserved but now accomdate images that require more than 32 bits of address
space when size_t/ptrdiff_t are 64 bit types.

Signed-off-by: John Bowler <jbowler@acm.org>

2016-01-18 20:44:26 -08:00

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