[OpenJDK 2D-Dev] [11] RFR JDK-6574555: PNGImageWriter incorrectly sets bKGD chunk

[Jayathirth D V]

Hello All,

 

Please review the following fix in JDK11 :

 

Bug : https://bugs.openjdk.java.net/browse/JDK-6574555 

Webrev : http://cr.openjdk.java.net/~jdv/6574555/webrev.00/ 

 

Issue: PNGImageWriter. write_bKGD() function sets incorrect R, G, B value when 
IHDR colortype and bKGD colortype is PNG_COLOR_RGB(A).

 

Solution: Assign values to all channels of RGB as they are present in Metadata 
instead of using only bKGD red value.

 

Note : Our default metadata doesn't set any bKGD chunk but if user specifies 
bKGD chunk and uses mergeTree() then we check bKGD  R, G, B values and if r == 
g == b then we store bKGD chunk as of type PNG_COLOR_GRAY.

 

Thanks,

Jay