[PATCH] windowscodecs: Implement WICCreateBitmapFromSectionEx.

[Vincent Povirk]

>  HRESULT BitmapImpl_Create(UINT uiWidth, UINT uiHeight,
> -    UINT stride, UINT datasize, BYTE *bits,
> +    UINT stride, UINT datasize, BYTE *data, void *view, UINT offset,
>      REFWICPixelFormatGUID pixelFormat, WICBitmapCreateCacheOption option,
>      IWICBitmap **ppIBitmap)
>  {
>      HRESULT hr;
>      BitmapImpl *This;
> -    BYTE *data;
>      UINT bpp;
>
>      hr = get_pixelformat_bpp(pixelFormat, &bpp);

data is not being used as an argument. It'd make more sense to keep it
as a local and remove bits.

> +    if (!stride) stride = (((bpp * width) + 31) / 32) * 4;
> +    size = stride * height;
> +    if (size / height != stride || offset > size) return E_INVALIDARG;

Why is it an error if offset > size?