al_iphone_override_screen_scale(3)

1al_iphone_override_screen_scLailber(a3r)y FunctionsaMla_niupahlone_override_screen_scale(3)
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NAME

6       al_iphone_override_screen_scale
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SYNOPSIS

9              #include <allegro5/allegro_iphone.h>
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11              void al_iphone_override_screen_scale(float scale)
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DESCRIPTION

14       Original  iPhones  and  iPod Touches had a screen resolution of 320x480
15       (in Portrait mode).  When the iPhone 4 and iPod  Touch  4th  generation
16       devices  came  out,  they were backwards compatible with all old iPhone
17       apps.  This means that they  assume  a  320x480  screen  resolution  by
18       default, while they actually have a 640x960 pixel screen (exactly 2x on
19       each dimension).  An API was added to allow access to the full  (or  in
20       fact any fraction of the) resolution of the new devices.  This function
21       is normally not needed, as in the case when you want a scale of 2.0 for
22       “retina  display”  resolution  (640x960).   In that case you would just
23       call al_create_display with the larger width and height parameters.  It
24       is  not limited to 2.0 scaling factors however.  You can use 1.5 or 0.5
25       or other values in between, however if it's not an  exact  multiple  of
26       the original iPhone resolution, linear filtering will be applied to the
27       final image.
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29       This function should be called BEFORE calling al_create_display.
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33Allegro reference manual                    al_iphone_override_screen_scale(3)