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From "Alexei Zakharov (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-4801) [classlib][awt] Performance improvement for java.awt.Color.ColorPaintContext
Date Mon, 17 Sep 2007 07:26:32 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-4801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alexei Zakharov reassigned HARMONY-4801:
----------------------------------------

    Assignee: Alexei Zakharov

> [classlib][awt] Performance improvement for java.awt.Color.ColorPaintContext
> ----------------------------------------------------------------------------
>
>                 Key: HARMONY-4801
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4801
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: Igor V. Stolyarov
>            Assignee: Alexei Zakharov
>         Attachments: H-4801.patch
>
>
> I would like suggest performance improvement for java.awt.Color.ColorPaintContext. According
to Spec in method createPaintContext of Paint interface ColorModel parameter is used only
as hint. If the application does not prefer a specific ColorModel, the null ColorModel argument
will give the Paint implementation full leeway in using the most efficient ColorModel it prefers
for its raster processing. Now Harmony create defaultRGB ColorModel which is not convenient
in most cases. I suggest using defaultRGB ColorModel only for Colors which have tansparency
different from OPAQUE and DirectColorModel(24, 0xFF0000, 0xFF00, 0xFF) for OPAQUE colors.
It should give significant boost on BufferedImage fill opatations because processing of Opaque
Images more than 3 times faster than Transparen Images.

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