[html5] a question about high-definition

caoyipeng caoyp at cn.fujitsu.com
Sun Apr 19 22:21:37 PDT 2009

there is a description at canvas in html5 :"On high-definition displays, for
instance, the user agent may internally use a bitmap with two device pixels
per unit in the coordinate space, so that the rendering remains at high
quality throughout." 


Why a bitmap with two device pixels per unit is high-definition displays? I
think it is a low-definition displays.for example:there is a picture on the
screen and the resolution is 1600*1200,and then we change the resolution as
800*600,we will find that the picture will be larger,because when the
resolution is 1600*1200,we supposed the picture is a device pixel per
unit;when change the resolution as 800*600,the picture is two device pixels
per unit,so the picture will be larger,but the picture is in a low
resolution,so i think a bitmap with two device pixels per unit is
low-definition displays..



Liu Ting 
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