if no b/a area enabled some speed up when opening images

COMPILE.txt

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+
+Windows
+-------
+
+Requirements:
+- MinGW + MSYS
+- CMake
+- GTK and GTKMM development environments
+
+Compile:
+- Start MSYS
+- Enter the root directory of the RawTherapee source tree
+- Type: cmake -G "MSYS Makefiles" .
+- Type: make install
+- You find the compiled program in the release directory
+
+Linux
+-----
+
+Requirements:
+- CMake
+- GTK and GTKMM development packages
+- libtiff, libpng, libjpeg, lcms, libiptcdata development packages
+- ...did I forget something?
+
+On Ubuntu/Debian the requirements can be installed by running:
+sudo apt-get install build-essential cmake libgtk2.0-dev libgtkmm-2.4-dev libtiff-dev libpng-dev libjpeg-dev liblcms-dev libiptcdata-dev merciurial
+
+Compile:
+- Enter the root directory of the RawTherapee source tree
+- Type: cmake -DCMAKE_INSTALL_PREFIX=./release -DBINDIR=. -DDATADIR=. -DLIBDIR=.
+- Type: make install
+- You find the compiled program in the release directory (you can copy it 
+anywhere you want)
+
+(By changing the cmake flags, you can change where the release is.  By removing all flags it should go to the standard system install location).
+
+...If you have problems with the compilation, identified the reason and fixed 
+the bug, please send me the updated build scripts (CMakeLists.txt files) to:
+hgabor@rawtherapee.com
+
+OSX
+---
+
+Requirements:
+- XCode Development Tools (you only need a subset of these, but it is probably easier to just install all of them)
+- MacPorts
+  - Set /opt/local/etc/macports/variants.conf to include "+no_x11 +quartz"
+  - If you want to build for multiple architectures, add +universal to variants.conf.  Note that this will increase the size of the final application substantially.
+    - Set /opt/local/etc/macports/macports.conf key 'universal_archs' to the architectures you wish to build for.  Possible values
+      include "i386 x86_64 ppc ppc64"
+    - Edit beginning of CMakeLists.txt to enable the same architectures as you added to variants.conf
+  - Run "sudo port install cairomm pango-devel gtk2 cmake glibmm gtkmm lcms libiptcdata" to install all needed libraries and tools
+  - If you don't already have Mercurial installed, run "sudo port install mercurial"
+  - If you want to try OpenMP builds, run "sudo port install gcc45"
+
+Compile:
+- Enter root directory of RawTherapee source tree
+- Type: cmake -D CMAKE_C_COMPILER=gcc-mp-4.5 -D CMAKE_CXX_COMPILER=g++-mp-4.5 . (to enable OpenMP, assuming you have installed gcc45) OR:
+        cmake -D OPTION_OMP=false . (to disable OpenMP and use the default compiler)
+- Type: make install
+- Type: ./tools/osx/make-app-bundle
+- You will find a RawTherapee.dmg file in release/ folder; this is the distribution release and can be run on any machine which meets the 
+  architecture requirements you specified in variants.conf earlier.
+
+For any bugs or patches to the OSX build, please contact Wyatt <wyatt@digitalcave.ca>