Slow emulation of StretchBlt

[Roderick Colenbrander]

Depending on source, destination format and some other things it may
get accelerated e.g. by winex11.drv to xrender. Assuming xrender is
picked, it could be that your drivers are not accelerating this
situation.

On Mon, Apr 17, 2017 at 8:29 AM, andrea <mariofutire at googlemail.com> wrote:
> Hi,
>
> I am looking at the performance of AppleWin (a 32 bit app) in Wine and have
> come across this function StretchBlt which seems to be much slower in Wine
> that in Windows 10.
>
> The call looks like this
>
>                         StretchBlt(
>                                 hFrameDC,
>                                 xdest, ydest,
>                                 wdest, hdest,
>                                 g_hDeviceDC,
>                                 xSrc, ySrc,
>                                 FRAMEBUFFER_BORDERLESS_W,
> FRAMEBUFFER_BORDERLESS_H,
>                                 SRCCOPY);
>
> With typical values
>
>                 xdest   0       int
>                 ydest   0       int
>                 wdest   1120    int
>                 hdest   768     int
>                 xSrc    22      int
>                 ySrc    17      int
>
>         #define  FRAMEBUFFER_BORDERLESS_W 560
>         #define  FRAMEBUFFER_BORDERLESS_H 384
>
> In Wine they take 20x the time in Windows 10 (running inside a VirtualBox).
> The consequence is CPU utilisation 20x higher in Wine than Windows.
>
> I am running wine 2.5 in a 64 bit Fedora 25 machine.
>
> Does this ring any bell?
>
> Andrea
>
>
>