Fix pixel alignment of glyphs when using raster engine on Mac Cocoa

The left bearing of the glyph has to be rounded before truncated,
otherwise the subpixel positioning of the glyph will be lost. The
visible consequence of this was on Mac Cocoa where certain pairs of
glyphs would get an extra pixel of space between them when running with
graphics system raster. With small fonts it would look pretty bad.

Task-number: QTBUG-5430
Reviewed-by: Trond

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp
index a192e87..46fbaa9 100644
--- a/src/gui/painting/qtextureglyphcache.cpp
+++ b/src/gui/painting/qtextureglyphcache.cpp
@@ -101,7 +101,7 @@ void QTextureGlyphCache::populate(const QTextItemInt &ti,
         Coord c = { 0, 0, // will be filled in later
                     glyph_width,
                     glyph_height, // texture coords
-                    metrics.x.truncate(),
+                    metrics.x.round().truncate(),
                     -metrics.y.truncate() }; // baseline for horizontal scripts
 
         listItemCoordinates.insert(glyph, c);