RFC XRender add support for dibsections in more color depths

[Roderick Colenbrander]

I just forgot to mention that next to adding proper Alpha support this
patch can dramatically improve performance in some programs.
Especially in some 2D games which suffer from DIB depth conversion
this patch helps a lot. E.g. C&C Tiberian Sun is a lot faster using
this patch WITHOUT any opengl (for Tiberian Sun xrender is better than
opengl). This is on Nvidia drivers which accelerate XRender well.
Geforce6/7 users make sure InitialPixmapPlacement is set to 2 for
optimal performance (this is the default value for Geforce8+ cards).

Roderick

On Thu, Jul 23, 2009 at 10:51 PM, Roderick
Colenbrander<thunderbird2k at gmail.com> wrote:
> Hi,
>
> For some weeks I have been working on moving more 2D rendering to
> XRender. XRender has three advantages for Wine. First of all it allows
> us to perform more rendering operations using X which we previously
> did using a combination of software rendering and back-forth copying
> between the Xserver. Second XRender offers depth conversion (this
> gives us proper alpha support in Wine and allows us to bypass DIB
> color conversion in some cases!). Third XRender brings us more
> hardware acceleration and that way more performance.
>
> The patch attached to this thread adds support for dibsections in
> additional color depths. On Xservers running at 24-bit this patch
> offers us dibsections in 1-bit/15-bit/16-bit/24-bit/32-bit. (32-bit is
> for proper alpha support) Big parts of the Wine X11 Driver make
> assumptions about having only two color depths around (1-bit and
> screen_depth e.g. 24-bit). I would like to request that people apply
> the current patch to latest git (in combination with the Office2007
> patch which I posted to wine-patches). Please report any 2D rendering
> issues you see and also mention possible Wine crashes due to X errors
> like BadMatch. Try as much programs as possible.
>
> Thanks in advance,
> Roderick Colenbrander
>