[vlc-devel] [PATCH] Direct2D video output module

David Kaplan david at 2of1.org
Sun Jul 25 14:28:53 CEST 2010

On 25 July 2010 14:19, Laurent Aimar <fenrir at elivagar.org> wrote:

>  It seems that it is not needed to store d2_dpi_x/d2_dpi_y  into the
> private
> context.

You're correct.

> +#   define WS_NONAVDONEBUTTON 0
> +#endif

>  Is it needed ?


> I wonder what its priority should be. If it is better/faster than gdi (and
> it should be when d2d support is present), I think it should have a
> priority
> a bit higher.

Yes it's better than GDI. I'll increase the priority.

> +    if (sys->d2_render_target && sys->d2_bitmap)
> +    {

>  Bad { placement.

Good spot.

>   Have you tested with crop(yes), zoom, auto-scale, aspect ratio, and
> various
> combination of them? (All in the Video menu).

I tested a WHOLE bunch but it was quite random so no sure if i missed stuff
out. Will test more.

  About our previous discussion, it seems that pitch != width * 4 is fine.
>  From msdn:
>  "pitch
>  UINT32
>  The stride, or pitch, of the source bitmap stored in srcData. The stride
>  is the byte count of a scanline (one row of pixels in memory). The stride
>  can be computed from the following formula:
>  pixel width * bytes per pixel + memory padding."

Yes it seems that way (I'm already using i_pitch) :)

 From msdn I see
> "Your application should create render targets once and hold onto them for
> the
>  life of the application or until the render target's EndDraw method
> returns the
>  D2DERR_RECREATE_TARGET error. When you receive this error, you need to
> recreate
>  the render target (and any resources it created)."
>  So it seems that you need to check for EndDraw error code and recreate the
> resources when needed. You can see how d3d does it.

I'm not sure what would cause D2DERR_RECREATE_TARGET but I suppose we should
handle it.

> +    D2D1_PIXEL_FORMAT pf = {
> > +        DXGI_FORMAT_B8G8R8A8_UNORM,
> > +        D2D1_ALPHA_MODE_IGNORE
> > +    };
>  As you now only require RGB32, is it possible to set a correct RGB mask
> in Open() ?

What do you mean? Have I set it incorrectly?
(An aside: I also hope to add some YUV->RGB DirectCompute support which
should speed things up nicely. At least until Microsoft sort out native YUV
support for D2D).

Thanks as always!
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