[PATCH 3/3] windowscodecs: Use source palette if it wasn't specified earlier for PNG frame

[Dmitry Timoshkov]

Nikolay Sivov <nsivov at codeweavers.com> wrote:

> @@ -1765,6 +1765,18 @@ static HRESULT WINAPI PngFrameEncode_WriteSource(IWICBitmapFrameEncode *iface,
>  
>      if (SUCCEEDED(hr))
>      {
> +        if (This->colors == 0)
> +        {
> +            IWICPalette *palette;
> +
> +            if (SUCCEEDED(PaletteImpl_Create(&palette)))
> +            {
> +                if (SUCCEEDED(IWICBitmapSource_CopyPalette(pIBitmapSource, palette)))
> +                    IWICBitmapFrameEncode_SetPalette(iface, palette);
> +                IWICPalette_Release(palette);
> +            }
> +        }
> +
>          hr = write_source(iface, pIBitmapSource, prc,
>              This->format->guid, This->format->bpp, This->width, This->height);
>      }

What is this for? It looks like a workaround for a WIC converter bug.
I'd like to see a test case for this behaviour.

-- 
Dmitry.