<AWT Dev> [OpenJDK 2D-Dev]  Review request for 8076545 Text size is twice bigger under Windows L&F on Win 8.1 with HiDPI display
alexandr.scherbatiy at oracle.com
Mon Nov 16 14:07:14 UTC 2015
Could you review the updated fix:
- round is used instead of ceil
- inverted scales are used
On 10/30/2015 10:40 PM, Jim Graham wrote:
> In this case round may be better. ceil() is more for cases where you
> needed "at least X amount of room", but I don't think a font size is
> an "at least this much" kind of case.
> Also, I've been toying with the idea that use of ceil() and floor() in
> any DPI-adjustment equations should really be "ceil(val - epsilon)" or
> "floor(ceil + epsilon)" for some small value of epsilon chosen just
> large enough to prevent various round-off errors from affecting the
> outcome. One idea is for 1/256 as the value of epsilon since that
> could equate to the smallest measurable difference in terms of alpha
> or interpolation results (or 1/512 for "half the smallest quantum")...
> On 10/29/15 1:36 PM, Phil Race wrote:
>> size->cx = (int)ceil(size->cx / scale);
>> So if size->cx / scale works out to be 12.0001 you will round it up
>> to 13?
>> Can you check what pixel size windows gives you in such a case ?
>> I'd be a little surprised if they did that rather than round.
>> Is the SetFontProperty that does not accept a scale parameter still used
>> somewhere ?
>> On 10/29/2015 04:53 AM, Sergey Bylokhov wrote:
>>> On 17.07.15 16:27, Alexander Scherbatiy wrote:
>>>>> - Sergey's point about multi-mon should be checked out.
>>>> Windows 8.1 has option "Let me choose one scaling level for
>>>> all my
>>>> If I unset it I am able to change the size of all items. However,
>>>> the DPI which returns GetDPIForMonitor is still 2 on HiDPI displays.
>>> This version looks fine, but I am sure it can be double checked on
>>> windows 10 at some moment as well.
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