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Force non-AA text when using a bitmap strike with only scaling transform.

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When the current font size matches one of the available fixed sizes, and
the overall transform has only scaling components, FreeType will use the
fixed size bitmaps by default. For glyphs which do not have bitmaps,
force them to be rendered in monochrome instead of anti-aliased so
that they all match nicely.
(cherry picked from commit 06af5c2891)
This commit is contained in:
Keith Packard 2007-10-30 22:00:59 -07:00 • committed by Carl Worth
parent 19e29dfb80
commit e9de14eb4d
1 changed files with 24 additions and 0 deletions
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24
src/cairo-ft-font.c
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@ -1512,6 +1512,30 @@ _cairo_ft_scaled_font_create (cairo_ft_unscaled_font_t *unscaled,
return NULL;
}
/*
* Force non-AA drawing when using a bitmap strike that
* won't be resampled due to non-scaling transform
*/
if (!unscaled->have_shape &&
(scaled_font->ft_options.load_flags & FT_LOAD_NO_BITMAP) == 0 &&
scaled_font->ft_options.base.antialias != CAIRO_ANTIALIAS_NONE &&
(face->face_flags & FT_FACE_FLAG_FIXED_SIZES))
{
int i;
FT_Size_Metrics *size_metrics = &face->size->metrics;
for (i = 0; i < face->num_fixed_sizes; i++)
{
FT_Bitmap_Size *bitmap_size = &face->available_sizes[i];
if (bitmap_size->x_ppem == size_metrics->x_ppem * 64 &&
bitmap_size->y_ppem == size_metrics->y_ppem * 64)
{
scaled_font->ft_options.base.antialias = CAIRO_ANTIALIAS_NONE;
break;
}
}
}
metrics = &face->size->metrics;