Support turning antialiasing of fonts off

Task-number: QTCREATORBUG-12177
Change-Id: Ibac20a6170d42237f1d7409c3ec18ae9af50811c
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

5 files changed, 24 insertions, 0 deletions

diff --git a/src/container_qpainter.cpp b/src/container_qpainter.cpp
index f175bce..a3e9350 100644
--- a/src/container_qpainter.cpp
+++ b/src/container_qpainter.cpp
@@ -462,6 +462,7 @@ litehtml::uint_ptr DocumentContainerPrivate::create_font(const litehtml::tchar_t
     font->setPixelSize(size);
     font->setWeight(cssWeightToQtWeight(weight));
     font->setStyle(toQFontStyle(italic));
+    font->setStyleStrategy(m_antialias ? QFont::PreferAntialias : QFont::NoAntialias);
     if (decoration == litehtml::font_decoration_underline)
         font->setUnderline(true);
     if (decoration == litehtml::font_decoration_overline)
@@ -1235,6 +1236,16 @@ QFont DocumentContainer::defaultFont() const
     return d->m_defaultFont;
 }
 
+void DocumentContainer::setAntialias(bool on)
+{
+    d->m_antialias = on;
+}
+
+bool DocumentContainer::antialias() const
+{
+    return d->m_antialias;
+}
+
 void DocumentContainer::setDataCallback(const DocumentContainer::DataCallback &callback)
 {
     d->m_dataCallback = callback;
diff --git a/src/container_qpainter.h b/src/container_qpainter.h
index f2a41d8..5921275 100644
--- a/src/container_qpainter.h
+++ b/src/container_qpainter.h
@@ -82,6 +82,8 @@ public: // outside API
 
     void setDefaultFont(const QFont &font);
     QFont defaultFont() const;
+    void setAntialias(bool on);
+    bool antialias() const;
 
     using DataCallback = std::function<QByteArray(QUrl)>;
     void setDataCallback(const DataCallback &callback);
diff --git a/src/container_qpainter_p.h b/src/container_qpainter_p.h
index 8fb1e0b..e74705f 100644
--- a/src/container_qpainter_p.h
+++ b/src/container_qpainter_p.h
@@ -127,6 +127,7 @@ public: // document_container API
     QString m_caption;
     QFont m_defaultFont = QFont(sansSerifFont(), 16);
     QByteArray m_defaultFontFamilyName = m_defaultFont.family().toUtf8();
+    bool m_antialias = true;
     QHash<QUrl, QPixmap> m_pixmaps;
     Selection m_selection;
     DocumentContainer::DataCallback m_dataCallback;
diff --git a/src/qlitehtmlwidget.cpp b/src/qlitehtmlwidget.cpp
index 3449fe5..0354c8e 100644
--- a/src/qlitehtmlwidget.cpp
+++ b/src/qlitehtmlwidget.cpp
@@ -479,6 +479,15 @@ QFont QLiteHtmlWidget::defaultFont() const
     return d->documentContainer.defaultFont();
 }
 
+void QLiteHtmlWidget::setAntialias(bool on)
+{
+    withFixedTextPosition([this, on] {
+        d->documentContainer.setAntialias(on);
+        // force litehtml to recreate fonts
+        setHtml(d->html);
+    });
+}
+
 void QLiteHtmlWidget::scrollToAnchor(const QString &name)
 {
     if (!d->documentContainer.hasDocument())
diff --git a/src/qlitehtmlwidget.h b/src/qlitehtmlwidget.h
index a86384c..965dfd2 100644
--- a/src/qlitehtmlwidget.h
+++ b/src/qlitehtmlwidget.h
@@ -36,6 +36,7 @@ public:
 
     void setDefaultFont(const QFont &font);
     QFont defaultFont() const;
+    void setAntialias(bool on);
 
     void scrollToAnchor(const QString &name);