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Bug 878029 - Update GetDefaultScaleInternal() in Gonk to match AOSP spec. r=mwu

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This commit is contained in:
Tim Chien 2013-06-03 08:30:28 -04:00
parent 688c2390b7
commit 2536217acc
1 changed files with 11 additions and 6 deletions
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17
widget/gonk/nsWindow.cpp
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@ -547,12 +547,17 @@ nsWindow::GetDPI()
double
nsWindow::GetDefaultScaleInternal()
{
double rawscale = GetDPI() / 192.0;
if (rawscale < 1.25)
return 1;
else if (rawscale < 1.75)
return 1.5;
return 2;
float dpi = GetDPI();
// The mean pixel density for mdpi devices is 160dpi, 240dpi for hdpi,
// and 320dpi for xhdpi, respectively.
// We'll take the mid-value between these three numbers as the boundary.
if (dpi < 200.0) {
return 1.0; // mdpi devices.
}
if (dpi < 280.0) {
return 1.5; // hdpi devices.
}
return 2.0; // xhdpi devices.
}
LayerManager *