path: root/src/gui/text/qfontengine_ft.cpp
diff options
authorEirik Aavitsland <>2016-07-22 10:43:01 +0200
committerEirik Aavitsland <>2016-07-27 09:01:15 +0000
commit5b64b64717caca231d399a138e747bdded9c116c (patch)
tree84e38d5604122aab8645894f99f9ad4ed5c00993 /src/gui/text/qfontengine_ft.cpp
parenta2157df28b8aaa0c6fc02a35a2b24fa82cb77230 (diff)
Fontengine: Avoid invalid alpha maps when antialiasing is off
When font antialising is disabled, the created alpha maps will be Mono format. Make sure that the created QImage is valid by ensuring that it has a color table of the right size. Issue was earlier handled by a4e2f2e687ca7aec88ecf82f72d42ac61e17a5b9, but that will be partially reverted because of compatibility break. Task-number: QTBUG-50745 Change-Id: I7c521288469ae94805a3326644771270d97ab979 Reviewed-by: Konstantin Ritt <> Reviewed-by: Eskil Abrahamsen Blomfeldt <>
Diffstat (limited to 'src/gui/text/qfontengine_ft.cpp')
1 files changed, 4 insertions, 1 deletions
diff --git a/src/gui/text/qfontengine_ft.cpp b/src/gui/text/qfontengine_ft.cpp
index 361702681f..4de41dfa99 100644
--- a/src/gui/text/qfontengine_ft.cpp
+++ b/src/gui/text/qfontengine_ft.cpp
@@ -1738,7 +1738,10 @@ static inline QImage alphaMapFromGlyphData(QFontEngineFT::Glyph *glyph, QFontEng
- return QImage(static_cast<const uchar *>(glyph->data), glyph->width, glyph->height, bytesPerLine, format);
+ QImage img(static_cast<const uchar *>(glyph->data), glyph->width, glyph->height, bytesPerLine, format);
+ if (format == QImage::Format_Mono)
+ img.setColor(1, QColor(Qt::white).rgba()); // Expands color table to 2 items; item 0 set to transparent.
+ return img;
QImage *QFontEngineFT::lockedAlphaMapForGlyph(glyph_t glyphIndex, QFixed subPixelPosition,