[OpenJDK 2D-Dev] Review Request for JDK-8139183 : drawImage misses background's alpha channel

[Jayathirth D V]

Hi,

 

I have updated the changes to select proper Buffer Image type based on source transparency and not just using ARGB directly.

 

Please find the updated webrev for review:

http://cr.openjdk.java.net/~jdv/8139183/webrev.01/ 

 

Thanks,

Jay

 

From: Jayathirth D V 
Sent: Wednesday, March 02, 2016 5:02 PM
To: 2d-dev at openjdk.java.net; Philip Race; Prasanta Sadhukhan
Subject: Review Request for JDK-8139183 : drawImage misses background's alpha channel

 

Hi,

 

Please review the following fix in JDK9:

 

Bug : https://bugs.openjdk.java.net/browse/JDK-8139183 

 

Webrev : http://cr.openjdk.java.net/~jdv/8139183/webrev.00/ 

 

Issue : When we scale any buffered image using drawImage() API which takes scale coordinates we are losing alpha channel in background color.

 

Root cause : We are creating opaque temporary image when we have background color and scale is happening in renderImageXform() API of DrawImage.java. By making it opaque we are losing translucency.

 

Solution : Instead of creating opaque RGB temporary image use ARGB temporary image to maintain translucency of image.

 

Thanks,

Jay
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