Resolves: tdf#105416 blank windows under HiDPI RTL

Change-Id: I819f06babd448c37ce2d58297562b640aba1c8c6
(cherry picked from commit 4e9cfc178c47893229f8030bfe73e2b7c5de92c3)
Reviewed-on: https://gerrit.libreoffice.org/33302
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>
diff --git a/vcl/headless/svpgdi.cxx b/vcl/headless/svpgdi.cxx
index 3f4a042..c832893 100644
--- a/vcl/headless/svpgdi.cxx
+++ b/vcl/headless/svpgdi.cxx
@@ -409,7 +409,7 @@ sal_uInt16 SvpSalGraphics::GetBitCount() const

long SvpSalGraphics::GetGraphicsWidth() const
{
    return m_pSurface ? cairo_image_surface_get_width(m_pSurface) : 0;
    return m_pSurface ? cairo_image_surface_get_width(m_pSurface) / m_fScale : 0;
}

void SvpSalGraphics::ResetClipRegion()