On Tue, Sep 20, 2016 at 10:21:40PM +0100, Mark Thompson wrote:
> On 20/09/16 22:07, Diego Biurrun wrote:
> > On Tue, Sep 20, 2016 at 09:22:06PM +0100, Mark Thompson wrote:
> >> On 20/09/16 19:36, Diego Biurrun wrote:
> >>> ptrdiff_t is the correct type for array strides and similar.
> >>> --- a/libavcodec/svq3.c
> >>> +++ b/libavcodec/svq3.c
> >>> @@ -118,8 +118,8 @@ typedef struct SVQ3Context {
> >>> int mb_x, mb_y;
> >>> int mb_xy;
> >>> int mb_width, mb_height;
> >>> - int mb_stride, mb_num;
> >>> - int b_stride;
> >>> + int mb_num;
> >>> + ptrdiff_t mb_stride, b_stride;
> >>
> >> mb_stride should stay an int.
> >
> > Why?
>
> It's used as:
>
> (a) an offset against the current macroblock for prediction modes.
>
> (b) a multiplier for y offsets to macroblock lines.
>
> (c) a size for macroblock lines.
>
> All of the other things there are ints (well, last one could be size_t), and
> have nothing to do with pointers.
All of the above sounds stride-ish to me and we seem to use ptrdiff_t
for such variables elsewhere. Ame I wrong?
Diego
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