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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  de-
       fault,  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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