On 2/5/2010 4:17 PM, Dave Calkins wrote:
You get less blurrier output if you don't do subpixel position of
glyphs.
How do I control whether or not subpixel positioning of the glyphs
occurs?
What is the translation component of the transform? If it is non-zero
then the
grid fitting won't help against blurriness (since the pixel-aligned
outline will then
be shifted to between pixels, making the rendering all blurry).
-Tor
In tracing into the call to FT_Render_Glyph, it eventually goes into
ft_smooth_render_generic.
When it gets here origin is NULL and so FT_Outline_Translate is not
called. So I think the answer to your question is that no translation
is occurring.
FreeTypeGL is rendering a single glyph using FT_Render_Glyph and then
using the resultant gray-scale bitmap to create a 2D GL texture.
I noticed while tracing through ft_smooth_render_generic that
FT_CONFIG_OPTION_SUBPIXEL_RENDERING is not defined.
maybe I spoke too soon. Tracing further shows the below. Here, x_shift
== 64 and y_shift == 0.
/* translate outline to render it into the bitmap */
FT_Outline_Translate( outline, -x_shift, -y_shift );
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