On 11/27/2017 10:25 AM, Dmitry wrote:
> On Monday, 27 November 2017 at 17:21:05 UTC, Dmitry wrote:
>> It fixed a delay (you can see it on video I posted before), but result
>> is same.
>
> It seems I found the problem.
>
> C++ version (line 93):
> if (image[index + 3] != 0)
>
> I changed to
> if (image[index] != 0)
>
> and it works.
>
> I don't understand why there was used "+ 3" (and why it works in C++
> version).
So, it looks like the original code was accessing out of bounds and
probably that's why you inserted the ((index + 3) < N) check in the D
version because D was catching that error at runtime.
// C++
if (image[index + 3] != 0)
// D
if (((index + 3) < N) && (data[index + 3] != 0))
Which of course would skip the body of the if block, causing a
difference from the original result.
Ali
