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nothings 2014-12-06 23:28:04 -08:00
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tests/oversample/README.md
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@ -5,7 +5,16 @@ benefits of oversampling. It will try to use arial.ttf from the
Windows font directory unless you type the name of a .ttf file as Windows font directory unless you type the name of a .ttf file as
a command-line argument. a command-line argument.
## About oversampling ## Benefits of oversampling
Improving subpixel has a few benefits:
* Text can remain sharper while still being sub-pixel positioned for better kerning
* Horizontally-oversampled text significantly reduces aliasing when text animates horizontally
* Vertically-oversampled text significantly reduces aliasing when text animates vertically
* Text oversampled in both directions significantly reduces aliasing when text rotates
## What text oversampling is
A common strategy for rendering text is to cache character bitmaps A common strategy for rendering text is to cache character bitmaps
and reuse them. For hinted characters, every instance of a given and reuse them. For hinted characters, every instance of a given
@ -43,9 +52,10 @@ So, setting oversampling of 2x2 in stb_truetype is equivalent to caching
each character in 4 different variations, 1 for each subpixel position each character in 4 different variations, 1 for each subpixel position
in a 2x2 set. in a 2x2 set.
The advantage of this formulation is that no changes are required to An advantage of this formulation is that no changes are required to
the rendering code; the exact same quad-rendering code works, it just the rendering code; the exact same quad-rendering code works, it just
uses different texture coordinates. (Note this does potentially increase uses different texture coordinates. (Note this does potentially increase
texture bandwidth for text rendering since we end up minifying the texture texture bandwidth for text rendering since we end up minifying the texture
without using mipmapping, but you probably are not going to be fill-bound without using mipmapping, but you probably are not going to be fill-bound
by your text rendering.) by your text rendering.)