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Bug 1246346 - patch 2 - Correct the origin of the DOM screen coordinates (screen.left, screen.top) for secondary display on a mixed-DPI configuration. r=emk

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This commit is contained in:
Jonathan Kew 2016-02-12 11:08:58 +00:00
parent e0e2bd09f7
commit ef2b8b8c1a
1 changed files with 21 additions and 4 deletions
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25
dom/base/nsScreen.cpp
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@ -133,9 +133,15 @@ nsScreen::GetRect(nsRect& aRect)
}
context->GetRect(aRect);
LayoutDevicePoint screenTopLeftDev =
LayoutDevicePixel::FromAppUnits(aRect.TopLeft(),
context->AppUnitsPerDevPixel());
DesktopPoint screenTopLeftDesk =
screenTopLeftDev / context->GetDesktopToDeviceScale();
aRect.x = NSToIntRound(screenTopLeftDesk.x);
aRect.y = NSToIntRound(screenTopLeftDesk.y);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);
@ -156,10 +162,21 @@ nsScreen::GetAvailRect(nsRect& aRect)
return NS_ERROR_FAILURE;
}
nsRect r;
context->GetRect(r);
LayoutDevicePoint screenTopLeftDev =
LayoutDevicePixel::FromAppUnits(r.TopLeft(),
context->AppUnitsPerDevPixel());
DesktopPoint screenTopLeftDesk =
screenTopLeftDev / context->GetDesktopToDeviceScale();
context->GetClientRect(aRect);
aRect.x = nsPresContext::AppUnitsToIntCSSPixels(aRect.x);
aRect.y = nsPresContext::AppUnitsToIntCSSPixels(aRect.y);
aRect.x = NSToIntRound(screenTopLeftDesk.x) +
nsPresContext::AppUnitsToIntCSSPixels(aRect.x - r.x);
aRect.y = NSToIntRound(screenTopLeftDesk.y) +
nsPresContext::AppUnitsToIntCSSPixels(aRect.y - r.y);
aRect.height = nsPresContext::AppUnitsToIntCSSPixels(aRect.height);
aRect.width = nsPresContext::AppUnitsToIntCSSPixels(aRect.width);