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nothings 2014-12-06 23:19:25 -08:00
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@ -20,9 +20,9 @@ However, if you simply cache a single version of the bitmap and
draw it at different subpixel positions with a GPU, you will get draw it at different subpixel positions with a GPU, you will get
either the exact same result (if you use point-sampling on the either the exact same result (if you use point-sampling on the
texture) or linear filtering. Linear filtering will cause a sub-pixel texture) or linear filtering. Linear filtering will cause a sub-pixel
positioned bitmap to blur further, causing a visible desharpening positioned bitmap to blur further, causing a visible de-sharpening
of the character. (And, since the character wasn't hinted, it was of the character. (And, since the character wasn't hinted, it was
already blurrier than a hinted one would be, and not it gets even already blurrier than a hinted one would be, and now it gets even
more blurry.) more blurry.)
You can avoid this by caching multiple variants of a character which You can avoid this by caching multiple variants of a character which
@ -32,7 +32,7 @@ horizontal offset, and always require characters to fall on integer
positions vertically. positions vertically.
When creating a texture atlas for use on GPUs, which support bilinear When creating a texture atlas for use on GPUs, which support bilinear
filtering, there is a better approach than caching several indepdent filtering, there is a better approach than caching several independent
positions, which is to allow lerping between the versions to allow positions, which is to allow lerping between the versions to allow
finer subpixel positioning. You can achieve these by interleaving finer subpixel positioning. You can achieve these by interleaving
each of the cached bitmaps, but this turns out to be mathematically each of the cached bitmaps, but this turns out to be mathematically