grabber api and feature unification (#462)

* move setvideomode to common place

* implement more croping and 3d support

* more api unification

* more refactoring

* osx fix

* next step

* add a mock for osx grabber. Now it is possible to test compile on none osx platforms.

* more unifications ...

* remove obsolete includes and grabbers are not dyn allocated. dispmanx needs rework an probaly not work atm

* first version of dispmanx mock. it compiles, but outputs a black image

* now dispmanx mock works!

* activate mocks in travis linux build
prepare dispmanx to rgb image out

* dispmanx now with image rgb output
fix deadlock with w/h -1 in grabber v4l
cleanups

* fix json

* fix some runtime stuff

* Update FramebufferWrapper.cpp

fix missing code

* unify grabframe

* 3d and croping for amlogic

* fix setimage not working

* make use of templates
save some codelines

* save more code lines

src/hyperion-aml/AmlogicWrapper.cpp

@@ -16,7 +16,7 @@ AmlogicWrapper::AmlogicWrapper(const unsigned grabWidth, const unsigned grabHeig
 const Image<ColorRgb> & AmlogicWrapper::getScreenshot()
 {
 	capture();
-	return _screenshot_rgb;
+	return _screenshot;
 }
 
 void AmlogicWrapper::start()
@@ -32,7 +32,5 @@ void AmlogicWrapper::stop()
 void AmlogicWrapper::capture()
 {
 	_grabber.grabFrame(_screenshot);
-	_screenshot.toRgb(_screenshot_rgb);
-
-	emit sig_screenshot(_screenshot_rgb);
+	emit sig_screenshot(_screenshot);
 }

src/hyperion-aml/AmlogicWrapper.h

@@ -37,7 +37,6 @@ private:
 	AmlogicGrabber   _grabber;
 
 	// image buffers
-	Image<ColorRgb>  _screenshot_rgb;
-	Image<ColorBgr>  _screenshot;
+	Image<ColorRgb>  _screenshot;
 
 };