<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 3:42 PM, Prasanta Sadhukhan wrote:
>
>
> 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/
>
Modified webrev to only update html renderer when JLabel is added to 
frame by listening to property "ancestor" which implies component is 
added/made visible, at which point correct graphics configuration is set.
http://cr.openjdk.java.net/~psadhukhan/8178025/webrev.02/

Regards
Prasanta
> Regards
> Prasana
>