Re: [PATCH 1/7] gdi32: Use GetDIBits in emfdrv_stretchblt.

[Jacek Caban]

On 8/11/21 12:11 PM, Huw Davies wrote:
> On Wed, Aug 11, 2021 at 10:57:56AM +0200, Jacek Caban wrote:
> > /* Generate an EMRBITBLT, EMRSTRETCHBLT or EMRALPHABLEND record depending on the type parameter */
> > -static BOOL emfdrv_stretchblt( PHYSDEV dev_dst, struct bitblt_coords *dst, PHYSDEV dev_src,
> > +static BOOL emfdrv_stretchblt( PHYSDEV dev_dst, struct bitblt_coords *dst, HDC hdc_src,
> >                                  struct bitblt_coords *src, DWORD rop, DWORD type )
> >   {
> > - unsigned char src_buffer[FIELD_OFFSET(BITMAPINFO, bmiColors[256])];
> > - BITMAPINFO *src_info = (BITMAPINFO *)src_buffer;
> > - UINT bits_size, bmi_size, emr_size, size, bpp;
> > - EMRSTRETCHBLT *emr_stretchblt;
> > - struct gdi_image_bits bits;
> > - BITMAPINFO src_info = {{ sizeof( src_info.bmiHeader ) }};
> > - UINT bmi_size, emr_size, size, bpp;
> >  BITMAPINFO *bmi;
> >  EMRBITBLT *emr;
> > - DC *dc_src;
> > - DWORD err;
> > - BOOL ret = FALSE;
> > -
> > - dc_src = get_physdev_dc(dev_src);
> > - dev_src = GET_DC_PHYSDEV(dc_src, pGetImage);
> > - err = dev_src->funcs->pGetImage(dev_src, src_info, &bits, src);
> > - if (err)
> > - {
> > -
> >    SetLastError(err);
> > -
> >    return FALSE;
> > - }
> > - HBITMAP bitmap;
> > - BOOL ret;
> > - bpp = src_info->bmiHeader.biBitCount;
> > - if (!(bitmap = GetCurrentObject( hdc_src, OBJ_BITMAP ))) return FALSE;
> > - if (!GetDIBits( hdc_src, bitmap, 0, INT_MAX, NULL, &src_info, DIB_RGB_COLORS )) return FALSE;
>
> What about a blit from a screen dc to the metafile?

I just tested it and they indeed should be supported by EMFs (they are, 
however, not supported by old-style metafiles). I guess we will need an 
additional blit into a temporary DC for that.

Thanks,

Jacek