Matthias Hochsteger c55ad18a73 Fix build/image export with USE_JPEG=ON
- fixes broken build with USE_JPEG
 - cleanes up the screenshot code itself (there were problems with memory
   alignment, now enforce alignment of 1 byte)
 - proper error message if 'convert' is not working
 - append '.ppm' to file for temporary filename instead of replacing last
   three characters
2017-09-22 11:26:10 +02:00
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