Quartz can not draw a line at y == height (for non-flipped view) and y == 0 (for flipped), that's why I had  a 1 pixel translation to make the line visible. Unfortunately, on retina one pixel is already 2 and this translation is quite visible. But as soon as Quartz operates with points, not pixels, the translation can be 0.5 and it's still OK (and 1 pixel on retina is still OK). line at width - 1 still has to be fixed somehow though (hehe, one more translation??)
Quartz can not draw a line at y == height (for non-flipped view) and y == 0 (for flipped), that's why I had 
a 1 pixel translation to make the line visible. Unfortunately, on retina one pixel is already 2 and this translation is quite visible. But as soon as Quartz operates with points, not pixels, the translation can be 0.5 and it's still OK (and 1 pixel on retina is still OK). line at width - 1 still has to be fixed somehow though (hehe, one more translation??)


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@47493 27541ba8-7e3a-0410-8455-c3a389f83636

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