Fixed an issue with text drawing to QImages on Mac/Cocoa.

We currently don't support subpixel hinting when drawing text to a
QImage on Mac. The alpha map that is returned by the font engine
is a plain 8 bit gray mask, which means we have to switch off subpixel
hinting when we draw the glyph for caching.

Task-number: 249178
Reviewed-by: Samuel

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/text/qfontengine_mac.mm b/src/gui/text/qfontengine_mac.mm
index 425cab2..d397e4a 100644
--- a/src/gui/text/qfontengine_mac.mm
+++ b/src/gui/text/qfontengine_mac.mm
@@ -553,7 +553,9 @@ QImage QCoreTextFontEngine::alphaMapForGlyph(glyph_t glyph)
                                              8, im.bytesPerLine(), colorspace,
                                              cgflags);
     CGContextSetFontSize(ctx, fontDef.pixelSize);
-    CGContextSetShouldAntialias(ctx, fontDef.pointSize > qt_antialiasing_threshold && !(fontDef.styleStrategy & QFont::NoAntialias));
+    CGContextSetShouldAntialias(ctx, fontDef.pointSize > qt_antialiasing_threshold
+				&& !(fontDef.styleStrategy & QFont::NoAntialias));
+    CGContextSetShouldSmoothFonts(ctx, false);
     CGAffineTransform oldTextMatrix = CGContextGetTextMatrix(ctx);
     CGAffineTransform cgMatrix = CGAffineTransformMake(1, 0, 0, 1, 0, 0);