Add renderTypeQuality property to Text element

For large scale text, the default distance field size gives
artifacts on certain font features. We already have an environment
variable which overrides this on an application level, but this
will cause all distance fields to be rendered at the high resolution,
whereas you may just want it for one particular text field.

Since this becomes an especially important use case now that we can
embed the text fields in a 3D scene, we add a property which can
be used to tweak the base font size used for generating the
distance fields.

[ChangeLog][QtQuick][Text] Added "renderTypeQuality" property, which
can be used in cases of very large fonts, where Qt's font rasterization
may show some rendering artifacts when using the default quality.

Fixes: QTBUG-84696
Change-Id: Ie4205e82cf441562dcc65a8e432a941a3baeddf3
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/quick/items/qquicktextnode.cpp b/src/quick/items/qquicktextnode.cpp
index 1bdc80c9a5..2ee8d08fff 100644
--- a/src/quick/items/qquicktextnode.cpp
+++ b/src/quick/items/qquicktextnode.cpp
@@ -78,7 +78,7 @@ namespace {
   Creates an empty QQuickTextNode
 */
 QQuickTextNode::QQuickTextNode(QQuickItem *ownerElement)
-    : m_cursorNode(nullptr), m_ownerElement(ownerElement), m_useNativeRenderer(false)
+    : m_cursorNode(nullptr), m_ownerElement(ownerElement), m_useNativeRenderer(false), m_renderTypeQuality(-1)
 {
 #ifdef QSG_RUNTIME_DESCRIPTION
     qsgnode_set_description(this, QLatin1String("text"));
@@ -107,7 +107,7 @@ QSGGlyphNode *QQuickTextNode::addGlyphs(const QPointF &position, const QGlyphRun
         }
     }
 
-    QSGGlyphNode *node = sg->sceneGraphContext()->createGlyphNode(sg, preferNativeGlyphNode);
+    QSGGlyphNode *node = sg->sceneGraphContext()->createGlyphNode(sg, preferNativeGlyphNode, m_renderTypeQuality);
 
     node->setOwnerElement(m_ownerElement);
     node->setGlyphs(position + QPointF(0, glyphs.rawFont().ascent()), glyphs);
@@ -130,7 +130,7 @@ QSGGlyphNode *QQuickTextNode::addGlyphs(const QPointF &position, const QGlyphRun
     parentNode->appendChildNode(node);
 
     if (style == QQuickText::Outline && color.alpha() > 0 && styleColor != color) {
-        QSGGlyphNode *fillNode = sg->sceneGraphContext()->createGlyphNode(sg, preferNativeGlyphNode);
+        QSGGlyphNode *fillNode = sg->sceneGraphContext()->createGlyphNode(sg, preferNativeGlyphNode, m_renderTypeQuality);
         fillNode->setOwnerElement(m_ownerElement);
         fillNode->setGlyphs(position + QPointF(0, glyphs.rawFont().ascent()), glyphs);
         fillNode->setStyle(QQuickText::Normal);