File 0001-Add-QFont-strategy-to-disable-subpixel-ant... of Package libqt5-qtbase

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File 0001-Add-QFont-strategy-to-disable-subpixel-antialiasing.patch of Package libqt5-qtbase (Revision 279b5b59dbe2ce83553094c0c4a865aa)

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From 820b20e593b7b0d92e6a78e7b23457f321aa0bc1 Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@digia.com>
Date: Thu, 24 Jul 2014 14:33:00 +0200
Subject: [PATCH 1/4] Add QFont strategy to disable subpixel antialiasing

This patch adds the option to disable subpixel antialiasing on QFont
basis. This can be useful when painting to offscreen surfaces. On OS X
this option disables the aggressive LCD font smoothing, which can be
necessary for certain fonts it may otherwise ruin.

Task-number: QTBUG-40396
Change-Id: I1664b636520ae63ee1503b5df7436748106b9f5c
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
(cherry picked from commit 7ff4621100b3df7ba9b336ac60204da4b548e642)
---
 src/gui/text/qfont.cpp                                             | 1 +
 src/gui/text/qfont.h                                               | 1 +
 .../fontdatabases/fontconfig/qfontconfigdatabase.cpp               | 4 +++-
 src/plugins/platforms/cocoa/qpaintengine_mac.mm                    | 7 +++++++
 src/plugins/platforms/windows/qwindowsfontdatabase.cpp             | 4 +++-
 5 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/gui/text/qfont.cpp b/src/gui/text/qfont.cpp
index cf40dd0..82676d7 100644
--- a/src/gui/text/qfont.cpp
+++ b/src/gui/text/qfont.cpp
@@ -1376,6 +1376,7 @@ QFont::StyleHint QFont::styleHint() const
     \value PreferOutline prefers outline fonts (as opposed to bitmap fonts).
     \value ForceOutline forces the use of outline fonts.
     \value NoAntialias don't antialias the fonts.
+    \value NoSubpixelAntialias avoid subpixel antialiasing on the fonts if possible.
     \value PreferAntialias antialias if possible.
     \value OpenGLCompatible forces the use of OpenGL compatible
            fonts.
diff --git a/src/gui/text/qfont.h b/src/gui/text/qfont.h
index 7fbaf24..f48f4cf 100644
--- a/src/gui/text/qfont.h
+++ b/src/gui/text/qfont.h
@@ -83,6 +83,7 @@ public:
         NoAntialias         = 0x0100,
         OpenGLCompatible    = 0x0200,
         ForceIntegerMetrics = 0x0400,
+        NoSubpixelAntialias = 0x0800,
         NoFontMerging       = 0x8000
     };
 
diff --git a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
index b8da972..e10e10b 100644
--- a/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
+++ b/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp
@@ -634,7 +634,9 @@ QFontEngine *QFontconfigDatabase::fontEngine(const QFontDef &f, void *usrPtr)
         }
 
         if (antialias) {
-            QFontEngineFT::SubpixelAntialiasingType subpixelType = subpixelTypeFromMatch(match);
+            QFontEngineFT::SubpixelAntialiasingType subpixelType = QFontEngineFT::Subpixel_None;
+            if (!(f.styleStrategy & QFont::NoSubpixelAntialias))
+                subpixelType = subpixelTypeFromMatch(match);
             engine->subpixelType = subpixelType;
 
             format = (subpixelType == QFontEngineFT::Subpixel_None)
diff --git a/src/plugins/platforms/cocoa/qpaintengine_mac.mm b/src/plugins/platforms/cocoa/qpaintengine_mac.mm
index f4cd071..d48cbdf 100644
--- a/src/plugins/platforms/cocoa/qpaintengine_mac.mm
+++ b/src/plugins/platforms/cocoa/qpaintengine_mac.mm
@@ -1084,6 +1084,10 @@ void QCoreGraphicsPaintEngine::drawTextItem(const QPointF &pos, const QTextItem
     if (textAA != lineAA)
         CGContextSetShouldAntialias(d->hd, textAA);
 
+    const bool smoothing = textAA && !(fe->fontDef.styleStrategy & QFont::NoSubpixelAntialias);
+    if (d->disabledSmoothFonts == smoothing)
+        CGContextSetShouldSmoothFonts(d->hd, smoothing);
+
     if (ti.glyphs.numGlyphs) {
         switch (fe->type()) {
         case QFontEngine::Mac:
@@ -1100,6 +1104,9 @@ void QCoreGraphicsPaintEngine::drawTextItem(const QPointF &pos, const QTextItem
     if (textAA != lineAA)
         CGContextSetShouldAntialias(d->hd, !textAA);
 
+    if (smoothing == d->disabledSmoothFonts)
+        CGContextSetShouldSmoothFonts(d->hd, !d->disabledSmoothFonts);
+
     updatePen(oldPen);
     updateBrush(oldBrush, oldBrushOrigin);
 }
diff --git a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
index f30dcba..27262ec 100644
--- a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
@@ -1521,13 +1521,15 @@ LOGFONT QWindowsFontDatabase::fontDefToLOGFONT(const QFontDef &request)
 #endif
 
     if (request.styleStrategy & QFont::PreferAntialias) {
-        if (QSysInfo::WindowsVersion >= QSysInfo::WV_XP) {
+        if (QSysInfo::WindowsVersion >= QSysInfo::WV_XP && !(request.styleStrategy & QFont::NoSubpixelAntialias)) {
             qual = CLEARTYPE_QUALITY;
         } else {
             qual = ANTIALIASED_QUALITY;
         }
     } else if (request.styleStrategy & QFont::NoAntialias) {
         qual = NONANTIALIASED_QUALITY;
+    } else if ((request.styleStrategy & QFont::NoSubpixelAntialias) && sharedFontData()->clearTypeEnabled) {
+        qual = ANTIALIASED_QUALITY;
     }
 
     lf.lfQuality        = qual;
-- 
2.1.1

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File 0001-Add-QFont-strategy-to-disable-subpixel-antialiasing.patch of Package libqt5-qtbase (Revision 279b5b59dbe2ce83553094c0c4a865aa)

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