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| author | Po Lu <luangruo@yahoo.com> | 2023-12-25 15:38:15 +0800 |
|---|---|---|
| committer | Po Lu <luangruo@yahoo.com> | 2023-12-25 15:38:15 +0800 |
| commit | 1be132731d31c3752b275735e5dbe1f60d1988c3 (patch) | |
| tree | 4b06f212052a83f8d079545aee2edaf56056d395 /src/sfnt.c | |
| parent | 995dd36da1df70c55ef2e72d4ff5b2641cc83292 (diff) | |
| download | emacs-1be132731d31c3752b275735e5dbe1f60d1988c3.tar.gz | |
Apply TTF advance width rounding to uninstructed glyphs
* src/sfnt.c (sfnt_scale_metrics):
* src/sfntfont.c (sfntfont_get_glyph_outline): Round advance and
floor lbearing scaling glyph metrics.
(sfntfont_measure_pcm): Don't round or truncate metrics which
have already been.
Diffstat (limited to 'src/sfnt.c')
| -rw-r--r-- | src/sfnt.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/src/sfnt.c b/src/sfnt.c index d945342c264..b67377ad064 100644 --- a/src/sfnt.c +++ b/src/sfnt.c @@ -5656,18 +5656,21 @@ sfnt_lookup_glyph_metrics (sfnt_glyph glyph, int pixel_size, return 0; } -/* Scale the specified glyph metrics by FACTOR. - Set METRICS->lbearing and METRICS->advance to their current - values times factor. */ +/* Scale the specified glyph metrics by FACTOR. Set METRICS->lbearing + and METRICS->advance to their current values times factor; take the + floor of the left bearing and round the advance width. */ MAYBE_UNUSED TEST_STATIC void sfnt_scale_metrics (struct sfnt_glyph_metrics *metrics, sfnt_fixed factor) { - metrics->lbearing - = sfnt_mul_fixed (metrics->lbearing * 65536, factor); - metrics->advance - = sfnt_mul_fixed (metrics->advance * 65536, factor); + sfnt_fixed lbearing, advance; + + lbearing = sfnt_mul_fixed (metrics->lbearing * 65536, factor); + advance = sfnt_mul_fixed (metrics->advance * 65536, factor); + + metrics->lbearing = sfnt_floor_fixed (lbearing); + metrics->advance = sfnt_round_fixed (advance); } /* Calculate the factor used to convert em space to device space for a |