Use getRGBXLine, faster

7 jobs for qpainter_rgbx in 4 minutes and 53 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #6150059
build

00:04:53

passed #6150064
build_android

00:00:50

passed #6150060
build_clang_libcpp

00:04:29

passed #6150063
build_clazy

00:04:37

passed #6150062
build_mingw64_fedora

00:02:54

passed #6150061
build_ubuntu_16_04

00:02:27

passed #6150058
clang_format

00:01:15