shithub: freetype+ttf2subf

Download patch

ref: f1458d2e44d89e8bc7c0db068f1cbc54b74b9d98
parent: 49c5e24a149a960b5f2736d7b1d98a4d56d7e2f0
author: Alexei Podtelezhnikov <apodtele@gmail.com>
date: Tue May 15 17:47:18 EDT 2018 

[base] Fix mono bitmap presetting (#53896).

It is rather fundamental to set monochrome bitmap based on rounded
CBox because the b/w rasterizer turns on pixels when their centers are
inside the glyph outline. The dropout control is unpredictable and can
distort narrow glyphs if the bitmap is too wide.

Reported by Chris Liddell.

* src/base/ftobjs.c (ft_glyphslot_preset_bitmap): If BBox boundaries
are too close, adjust them before rounding.

git/fs: mount .git/fs: mount/attach disallowed 
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2018-05-15  Alexei Podtelezhnikov  <apodtele@gmail.com>
+
+	[base] Fix mono bitmap presetting (#53896).
+
+	It is rather fundamental to set monochrome bitmap based on rounded
+	CBox because the b/w rasterizer turns on pixels when their centers are
+	inside the glyph outline. The dropout control is unpredictable and can
+	distort narrow glyphs if the bitmap is too wide.
+
+	Reported by Chris Liddell.
+
+	* src/base/ftobjs.c (ft_glyphslot_preset_bitmap): If BBox boundaries
+	are too close, adjust them before rounding.
+
 2018-05-15  Werner Lemberg  <wl@gnu.org>
 
 	[psaux] Fix compiler warning (#53915).
--- a/src/base/ftobjs.c
+++ b/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 );
+        cbox.xMin = ( cbox.xMin + cbox.xMax ) / 2 - 32;
+        cbox.xMax = cbox.xMin + 64;
       }
-      else
-      {
-        cbox.xMin = FT_PIX_ROUND_LONG( cbox.xMin );
-        cbox.xMax = FT_PIX_ROUND_LONG( cbox.xMax );
-      }
 
+      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 );
+        cbox.yMin = ( cbox.yMin + cbox.yMax ) / 2 - 32;
+        cbox.yMax = cbox.yMin + 64;
       }
-      else
-      {
-        cbox.yMin = FT_PIX_ROUND_LONG( cbox.yMin );
-        cbox.yMax = FT_PIX_ROUND_LONG( cbox.yMax );
-      }
+
+      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;
-- 
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