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JDK-4884878 : IndexColorModel.getTransparentPixel() not returning -1 for ICMs w/o trans pixel

Details
Type:
Bug
Submit Date:
2003-06-27
Status:
Closed
Updated Date:
2017-05-16
Project Name:
JDK
Resolved Date:
2003-08-27
Component:
client-libs
OS:
solaris_8
Sub-Component:
2d
CPU:
sparc
Priority:
P2
Resolution:
Fixed
Affected Versions:
5.0
Fixed Versions:
5.0 (tiger)

Related Reports

Sub Tasks

Description
IndexColorModel.getTransparentPixel() is returning 0 instead of -1 for certain IndexColorModels that do not have a transparent pixel but have alpha.  
This is happening for ICMs created with the following constructors:
IndexColorModel(int, int, byte[], byte[], byte[], byte[]) ,
IndexColorModel(int, int, byte[], int, true), and
IndexColorModel(int, int, byte[], int, true, int trans) when trans is an invalid index (such as -1).

A test is attached that illustrates this problem.

Comments
CONVERTED DATA

BugTraq+ Release Management Values

COMMIT TO FIX:
tiger

FIXED IN:
tiger

INTEGRATED IN:
tiger
tiger-b15

VERIFIED IN:
tiger
2004-06-14 
EVALUATION

Not clear if this is a bug.  ICM is returning a transparent pixel.
###@###.### 2003-06-27
 
So the cases the jck tests are running into are:
  - if no tr.pixel is supplied, but the CM has transparency, we
    set a valid tr.pixel, if there's one
    (they assume it should always be -1, because they didn't set it)
 
  - if an invalid tr. pixel is supplied and CM has transparent
    pixels, we set a valid transparent pixel
    (they assume it should always be -1)
 
Solution
Clarify on what we understand under transparent pixel, and how we handle
it in different situations.
No changes to functionality is required.
 
getTransparentPixel already implies that it might search out a
transparent pixel since it doesn't define the term "the transparent
pixel".  That could mean "the pixel that we were told to force
to be transparent in the constructor" or it could mean "the
pixel which represents a transparent color".

See CCC request:
  http://ccc.sfbay/4884878

The appropriate jck tests need to be updated to satisfy the new
spec.


###@###.### 2003-07-24

============================================
JCK tests have been updated and will be in b04 of the Tiger JCK.  Fix verifies in b16 of Tiger JDK.
###@###.### 2003-08-27
========================================
2003-08-27 
SUGGESTED FIX

http://javaweb.sfbay/jcg/1.5.0-tiger/2D/4884878

###@###.### 2003-07-24
2003-07-24


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