The sample file provided in bug #823274 renders vertically flipped with your patch (r10627) but not in r10626 and stable 0.48.x. Other PDF viewers render the logo vertically flipped too.
It seems that your patch possibly negatively affects how Inkscape renders PDF files round-trip edited in Inkscape (i.e. PDF files, e.g. saved with Firefox from the web (uses cairo as well afaik), and later edited & resaved in Inkscape)?
Related: /bugs.launchpad .net/inkscape/ +bug/823274>
Bug #823274 “Embedded raster image mirrored on PDF export”
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The sample file provided in bug #823274 renders vertically flipped with your patch (r10627) but not in r10626 and stable 0.48.x. Other PDF viewers render the logo vertically flipped too.
It seems that your patch possibly negatively affects how Inkscape renders PDF files round-trip edited in Inkscape (i.e. PDF files, e.g. saved with Firefox from the web (uses cairo as well afaik), and later edited & resaved in Inkscape)?