GridCoverageRenderer workaround for JAI exception
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Key: GEOT-3413
URL: http://jira.codehaus.org/browse/GEOT-3413
Project: GeoTools
Issue Type: Improvement
Components: core render
Affects Versions: 2.7-RC1
Reporter: Simone Giannecchini
Assignee: Simone Giannecchini
Priority: Minor
Fix For: 2.7.0, 2.8-M1
The GridCoverageRenderer internally makes use of JAI scale and or affine
transformations to cope with the raster pipleine of operations.
It may happen then when we are trying to subsample heavily an image we get out
an image with 0 width and/or height, this causes a strange exception, in the
rendering process.
We need to try and catch this error before it it leaves the render and return a
null image, which means, fill the request with background color ro anyway, the
request generated a degenerate image. As an instance GeoServer will responde by
filling the requeste area with the BKG color.
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