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<p class="MsoNormal"><span lang="EN-US">Hi Sven,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I encountered the same problem few weeks ago. The pattern does exist: If the width of the image is not evenly divisible by four, than the layer transparency fails.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I was just about to write a message like yours, but as I managed to reproduce the bug with a small testscript, I stumbled upon an error and then found out that it is already a known thing…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="http://osgeo-org.1560.x6.nabble.com/Layer-opacity-not-working-td5292269.html"><span lang="EN-US">http://osgeo-org.1560.x6.nabble.com/Layer-opacity-not-working-td5292269.html</span></a><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">As Jeff pointed out, if you built it on your own, then you can disable pixman, if you don’t actually need it… Cairo support was dependent of pixman I think.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If you are using a compiled package, maybe you can circumvent this issue by using the OPACITY at CLASS level. I know that OPACITY is already deprecated, but it might be useful until we are forced to use COMPOSITE blocks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">LAYER<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">__OPACITY 50 # doesn’t work<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">__CLASS<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">____STYLE<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">______OPACITY 50 # works<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">____END<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">__END<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">END<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">If the layer objects are disjoint, the result should be the same. If polygons of the same layer overlap their opacities will add up, which or might not be useful behaviour…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE">I am also interested in alternatives. For example: Is it possible to change pixman, so the bug doesn’t occur? Sadly, I didn’t manage to compile Mapserver with PHP7 myself yet. If it turns
out that nobody needs Pixman/Cairo and MS4W will be compiled without it, it would be fine for me as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Jens<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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