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| author | Chris Liddell <chris.liddell@artifex.com> | 2018-05-17 07:35:02 +0100 |
|---|---|---|
| committer | Chris Liddell <chris.liddell@artifex.com> | 2018-05-18 13:17:15 +0100 |
| commit | 891ea7d2813edaa3c7c874a4053afdda128e8a10 (patch) | |
| tree | 43a405ea0e6a3a9ab64e245c61cd30fef7ea2f2b /freetype | |
| parent | 9cb169b6b260f650aac2c3c7ed7af0f345ee0707 (diff) | |
| download | ghostpdl-891ea7d2813edaa3c7c874a4053afdda128e8a10.tar.gz | |
Fix for small glyph distortion
Glyphs with very few pixels (i.e. lower case "i" in 9pt text rendered at 72dpi)
we being distorted due to the specific rules applied by Freetype's dropout
compensation. This isn't a full solution but resolves the change in behaviour
between 2.7.x and 2.9.x (the change was due to different rounding being
applied).
This fix is from upstream:
http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=f1458d2e44d8
So should be in future Freetype releases, and not need re-applied here.
Diffstat (limited to 'freetype')
| -rw-r--r-- | freetype/src/base/ftobjs.c | 32 |
1 files changed, 13 insertions, 19 deletions
diff --git a/freetype/src/base/ftobjs.c b/freetype/src/base/ftobjs.c index 8d07e35ae..926943b2f 100644 --- a/freetype/src/base/ftobjs.c +++ b/freetype/src/base/ftobjs.c @@ -374,32 +374,26 @@ /* unless the rounded box can collapse for a narrow glyph */ if ( cbox.xMax - cbox.xMin < 64 ) { - cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); - cbox.xMax = FT_PIX_CEIL_LONG( cbox.xMax ); - } - else - { - cbox.xMin = FT_PIX_ROUND_LONG( cbox.xMin ); - cbox.xMax = FT_PIX_ROUND_LONG( cbox.xMax ); + cbox.xMin = ( cbox.xMin + cbox.xMax ) / 2 - 32; + cbox.xMax = cbox.xMin + 64; } + cbox.xMin = FT_PIX_ROUND_LONG( cbox.xMin ); + cbox.xMax = FT_PIX_ROUND_LONG( cbox.xMax ); + if ( cbox.yMax - cbox.yMin < 64 ) { - cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); - cbox.yMax = FT_PIX_CEIL_LONG( cbox.yMax ); - } - else - { - cbox.yMin = FT_PIX_ROUND_LONG( cbox.yMin ); - cbox.yMax = FT_PIX_ROUND_LONG( cbox.yMax ); + cbox.yMin = ( cbox.yMin + cbox.yMax ) / 2 - 32; + cbox.yMax = cbox.yMin + 64; } + + cbox.yMin = FT_PIX_ROUND_LONG( cbox.yMin ); + cbox.yMax = FT_PIX_ROUND_LONG( cbox.yMax ); + + break; #else - cbox.xMin = FT_PIX_FLOOR( cbox.xMin ); - cbox.yMin = FT_PIX_FLOOR( cbox.yMin ); - cbox.xMax = FT_PIX_CEIL_LONG( cbox.xMax ); - cbox.yMax = FT_PIX_CEIL_LONG( cbox.yMax ); + goto Round; #endif - break; case FT_RENDER_MODE_LCD: pixel_mode = FT_PIXEL_MODE_LCD; |