=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">On 11/12/2020 17:50, Bob Friesenhahn wrote:

>

> No.=C2=A0 There is only one version of PNG files.=C2=A0 The PNG format=
was not

> updated for 64-bit apps. :-)

>

> The PNG format is designed to only deal with a small bit of data at a =


> time.

>

> The main thing to be aware of under Windows when porting from 32 to r>
> 64-bits is that the size of a 'long' type remains the same, bu=
t the

> size of 'size_t' (the size of memory that malloc may allocate)=
and the

> size of pointers become 64 bits.=C2=A0 This means that additional work=
must

> be done under Windows in order for a ported 32-bit app to fully

> benefit from 64-bits, and care must be taken to avoid passing 64-bit <=
br>
> values into 32-bit storage.

>



Many thanks for that, Bob.=C2=A0 I've started a thread over on the Gnom=
e

Discourse site - though I must admit, it's all a bit baffling at the r>
moment:-



g-msvc/5013" rel=3D"noreferrer" target=3D"_blank">https://discourse.gnome.o=
rg/t/building-gdk-pixbuf-as-64-bit-using-msvc/5013



Regards, John





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