<Swing Dev> [10] RFR JDK-8178025:HiDPI with non-integer scale factor - SPANs in HTML are rendered overlapping each other

[Prasanta Sadhukhan]

On 10/19/2017 3:49 AM, Sergey Bylokhov wrote:
> On 17/10/2017 03:48, Prasanta Sadhukhan wrote:
>> It seems for JLabel, Component.updateGraphicsData() with proper 
>> GraphicsConfiguraiton is never called which it does for 
>> JTextComponent or JDialog. Do you know why? Because of this, correct 
>> FRC is not created.
>> I am not sure what else I can do to create correct FRC.
>
> But at some point we will get a correct GraphicsConfiguraiton for a 
> component, right? It should be called for the window and child when we 
> show the window on the screen, when we move the window to another 
> screen, etc.
>
>
Yes, it seems to be called when JLabel is added to JFrame but not before.
Span is calculated in GlyphPainter1.getSpan() which is called when 
JLabel is created and
as it seems, not when JLabel is added to JFrame (which is when we get 
the correct graphics configuration and therefore correct transform).

So, we need to make sure spans are recalculated when the JLabel is added 
to frame, which is what modified webrev does by calling JLabel.updateUI()
http://cr.openjdk.java.net/~psadhukhan/8178025/webrev.01/

Regards
Prasana