Composition of multiple feature type styles might lead to unexpected color
blends
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Key: GEOT-2319
URL: http://jira.codehaus.org/browse/GEOT-2319
Project: GeoTools
Issue Type: Bug
Components: core render
Affects Versions: 2.5.3
Reporter: Andrea Aime
Assignee: Andrea Aime
Fix For: 2.5.4
Say you have two layers, a background one with a single big blue polygon, and a
second layer that uses two feature type styles, both filling polygons with a
yellow color (say we're using fts to make sure a certain kind of polygon gets
drawn on top). Now, the first fts will drawn fine and end up being yellow on
the map, the second one might get out green.
This is due to the usage of back buffers to draw the two fts in parallel
without having to access the data source one time for each fts, and the
graphics object composite not being reset to SRC_OVER before merging in the
back buffers into the main graphic. So it just takes any symbolizer using an
opacity less than one to have the back buffer be renderer with the wrong
composite and thus result in color blending where there was not supposed to be
any.
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