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Bug 548935: If we're on a higher DPI invalidate a mysterious row of pixels which might scroll into view when on D2D. r=jimm

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This commit is contained in:
Bas Schouten 2010-03-20 18:25:38 +01:00
parent abf137066f
commit db83aa722f
1 changed files with 14 additions and 0 deletions
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14
widget/src/windows/nsWindow.cpp
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@ -2391,6 +2391,20 @@ nsWindow::Scroll(const nsIntPoint& aDelta,
::GetUpdateRgn(mWnd, updateRgn, FALSE);
::OffsetRgn(updateRgn, aDelta.x, aDelta.y);
if (gfxPlatform::GetDPI() != 96 &&
aDelta.y < 0 &&
clip.bottom == (mBounds.y + mBounds.height)) {
// XXX - bug 548935 - we can at high DPI settings scroll an undrawn
// row of pixels into view. This row should be invalidated to make
// sure it contains the correct content.
HRGN scrollRgn = ::CreateRectRgn(clip.left,
clip.bottom + aDelta.y - 1,
clip.right,
clip.bottom + aDelta.y);
::CombineRgn(updateRgn, updateRgn, scrollRgn, RGN_OR);
::DeleteObject((HGDIOBJ)scrollRgn);
}
} else {
#endif
::ScrollWindowEx(mWnd, aDelta.x, aDelta.y, &clip, &clip, updateRgn, NULL, flags);