[Libreoffice-bugs] [Bug 141269] FILESAVE: PNG: Incorrect transparency after roundtrip

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=141269

--- Comment #9 from Xisco Faulí <xiscofauli at libreoffice.org> ---
it seems this change fixes the issue

--- a/vcl/source/filter/png/pngwrite.cxx
+++ b/vcl/source/filter/png/pngwrite.cxx
@@ -563,7 +563,7 @@ sal_uLong PNGWriterImpl::ImplGetFilter(sal_uLong nY,
sal_uLong nXStart, sal_uLon
                         *pDest++ = rColor.GetRed();
                         *pDest++ = rColor.GetGreen();
                         *pDest++ = rColor.GetBlue();
-                        *pDest++ = 255 -
mpMaskAccess->GetIndexFromData(pScanlineMask, nX);
+                        *pDest++ =
mpMaskAccess->GetIndexFromData(pScanlineMask, nX);
                     }
                 }
                 else


however, it breaks the transparency of the icons in the sidebar

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