Name: dk106046 Date: 08/18/2003

OPERATING SYSTEM(S):
--------------------
Turbo Linux 8


FULL JDK VERSION(S):
-------------------
This test fails with Sunjdk1.4.1 (build 1.4.1_01-b01),



------------

java -jar Font2DTest.jar

modify something (such as the font size), then
use "save as JPEG" from the menu.

There is a classcast exception:

java.lang.ClassCastException: sun.awt.image.DataBufferNative
        at sun.awt.image.codec.JPEGImageEncoderImpl.encode(JPEGImageEncoderImpl.java:436)
        at sun.awt.image.codec.JPEGImageEncoderImpl.encode(JPEGImageEncoderImpl.java:259)
        at FontPanel$FontCanvas.writeJPEG(FontPanel.java:1060)

This appears to be because the field db is a DataBufferNative, which inherits from DataBuffer,
as do DataBufferInt and DataBufferByte, so a class cast between them would fail.

Whilst I dont fully understand the problem (I.E why a DataBufferNative is being supplied in this
case), I have altered the code such that it goes down the alternative path if it is given a
DataBufferNative, and that "seems to work" - Here are the modifications:


>>>> import sun.awt.image.DataBufferNative;

              pack = false;
>>>> if (cmok && useGiven(ras) && !(db instanceof DataBufferNative) ) { /*ibm@63210*/
                     ComponentSampleModel csm =(ComponentSampleModel)sm;

                     start = (int)(db.getOffset()+
                            csm.getOffset(
                                ras.getMinX() - ras.getSampleModelTranslateX(),
                                ras.getMinY() - ras.getSampleModelTranslateY()
                                ));
                     line = (int)csm.getScanlineStride();
                     data = ((DataBufferByte)db).getData();

>>>> } else if (cmok && canPack(ras) && !(db instanceof DataBufferNative) ) { /*ibm@63210*/
                     SinglePixelPackedSampleModel sppsm;
                     sppsm = (SinglePixelPackedSampleModel)sm;

                     start = (int)(db.getOffset()+
                            sppsm.getOffset(
                                ras.getMinX() - ras.getSampleModelTranslateX(),
                                ras.getMinY() - ras.getSampleModelTranslateY()
                                ));
                     line = (int)sppsm.getScanlineStride();
                     data = ((DataBufferInt)db).getData();
                     pack = true;
              } else {


[This bug is being submitted as a courtesy, in order to maintain uniformity between Sun & IBM JDKs. It has been fixed in IBM JDKs.
Please contact ###@###.### if you have questions.]
======================================================================
This is reproducible on WinXP with JPEGFlip program (which is part of Java2Demo) when executed with OpenGL flag. This is not reproducible with JPEGFlip on DDRAW, NODDRAW. I have attached the code to this bug report.

###@###.### 2004-07-27