[jira] Updated: (HARMONY-4801) [classlib][awt] Performance improvement for java.awt.Color.ColorPaintContext

["Igor V. Stolyarov (JIRA)" <ji...@apache.org>]

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

Igor V. Stolyarov updated HARMONY-4801:
---------------------------------------

    Attachment: H-4801.patch

Fix attached.

> [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
>         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 because processing of Opaque Images more then 3 times faster then Transparen Images.

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