al_iphone_override_screen_scale man page on DragonFly

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al_iphone_override_screen_scale(3)	    al_iphone_override_screen_scale(3)

       al_iphone_override_screen_scale - Allegro 5 API

	      #include <allegro5/allegro_iphone.h>

	      void al_iphone_override_screen_scale(float scale)

       Original	 iPhones  and  iPod Touches had a screen resolution of 320x480
       (in Portrait mode).  When the iPhone 4 and iPod	Touch  4th  generation
       devices	came  out,  they were backwards compatible with all old iPhone
       apps.  This means that they  assume  a  320x480	screen	resolution  by
       default, while they actually have a 640x960 pixel screen (exactly 2x on
       each dimension).	 An API was added to allow access to the full  (or  in
       fact any fraction of the) resolution of the new devices.	 This function
       is normally not needed, as in the case when you want a scale of 2.0 for
       "retina	display"  resolution  (640x960).   In that case you would just
       call al_create_display with the larger width and height parameters.  It
       is  not limited to 2.0 scaling factors however.	You can use 1.5 or 0.5
       or other values in between, however if it's not an  exact  multiple  of
       the original iPhone resolution, linear filtering will be applied to the
       final image.

       This function should be called BEFORE calling al_create_display.

Allegro reference manual		    al_iphone_override_screen_scale(3)

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