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Bug 998821. Only use XShm for drawing if XShm allocation actually succeeded. r=karlt
--HG-- extra : rebase_source : 9d0fc1b9c7b02c53674b4593eaf1cd703587a469
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@ -2220,7 +2220,7 @@ nsWindow::OnExposeEvent(cairo_t *cr)
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}
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}
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# ifdef MOZ_HAVE_SHMIMAGE
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if (nsShmImage::UseShm() && MOZ_LIKELY(!mIsDestroyed)) {
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if (mShmImage && MOZ_LIKELY(!mIsDestroyed)) {
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#if (MOZ_WIDGET_GTK == 2)
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mShmImage->Put(mGdkWindow, exposeRegion.mRects, exposeRegion.mRectsEnd);
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#else
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