From fd8028514550da7594736a10f1d20bab1576bcfd Mon Sep 17 00:00:00 2001
From: Yoann Lopes <yoann.lopes@nokia.com>
Date: Tue, 20 Mar 2012 14:09:13 +0100
Subject: Don't register sub distance field glyph nodes with the glyph cache.

The original distance field glyph node takes care of the glyphs
reference counting. The potential sub glyph nodes created when the
glyphs are in another texture are note registered anymore with the cache
and don't reference count their glyphs.
Also got rid of unnecessary data members.

Change-Id: I1544792d5d896c6de26e0838e4f80397759ea012
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>
---
 src/quick/scenegraph/qsgdistancefieldglyphnode.cpp | 61 +++++++++++-----------
 1 file changed, 31 insertions(+), 30 deletions(-)

(limited to 'src/quick/scenegraph/qsgdistancefieldglyphnode.cpp')

diff --git a/src/quick/scenegraph/qsgdistancefieldglyphnode.cpp b/src/quick/scenegraph/qsgdistancefieldglyphnode.cpp
index 16a8ce2d79..d6fe6f938c 100644
--- a/src/quick/scenegraph/qsgdistancefieldglyphnode.cpp
+++ b/src/quick/scenegraph/qsgdistancefieldglyphnode.cpp
@@ -47,7 +47,8 @@
 QT_BEGIN_NAMESPACE
 
 QSGDistanceFieldGlyphNode::QSGDistanceFieldGlyphNode(QSGContext *context)
-    : m_context(context)
+    : m_glyphNodeType(RootGlyphNode)
+    , m_context(context)
     , m_material(0)
     , m_glyph_cache(0)
     , m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 0)
@@ -69,15 +70,17 @@ QSGDistanceFieldGlyphNode::~QSGDistanceFieldGlyphNode()
 {
     delete m_material;
 
+    if (m_glyphNodeType == SubGlyphNode)
+        return;
+
     if (m_glyph_cache) {
         m_glyph_cache->release(m_glyphs.glyphIndexes());
         m_glyph_cache->unregisterGlyphNode(this);
         m_glyph_cache->unregisterOwnerElement(ownerElement());
     }
 
-    for (int i = 0; i < m_nodesToDelete.count(); ++i)
-        delete m_nodesToDelete.at(i);
-    m_nodesToDelete.clear();
+    while (m_nodesToDelete.count())
+        delete m_nodesToDelete.takeLast();
 }
 
 void QSGDistanceFieldGlyphNode::setColor(const QColor &color)
@@ -106,8 +109,15 @@ void QSGDistanceFieldGlyphNode::setGlyphs(const QPointF &position, const QGlyphR
     m_position = QPointF(position.x(), position.y() - font.ascent());
     m_glyphs = glyphs;
 
+    m_dirtyGeometry = true;
+    m_dirtyMaterial = true;
+
     QSGDistanceFieldGlyphCache *oldCache = m_glyph_cache;
     m_glyph_cache = m_context->distanceFieldGlyphCache(m_glyphs.rawFont());
+
+    if (m_glyphNodeType == SubGlyphNode)
+        return;
+
     if (m_glyph_cache != oldCache) {
         Q_ASSERT(ownerElement() != 0);
         if (oldCache) {
@@ -122,9 +132,6 @@ void QSGDistanceFieldGlyphNode::setGlyphs(const QPointF &position, const QGlyphR
     const QVector<quint32> glyphIndexes = m_glyphs.glyphIndexes();
     for (int i = 0; i < glyphIndexes.count(); ++i)
         m_allGlyphIndexesLookup.insert(glyphIndexes.at(i));
-
-    m_dirtyGeometry = true;
-    m_dirtyMaterial = true;
 }
 
 void QSGDistanceFieldGlyphNode::setStyle(QQuickText::TextStyle style)
@@ -153,9 +160,8 @@ void QSGDistanceFieldGlyphNode::preprocess()
 {
     Q_ASSERT(m_glyph_cache);
 
-    for (int i = 0; i < m_nodesToDelete.count(); ++i)
-        delete m_nodesToDelete.at(i);
-    m_nodesToDelete.clear();
+    while (m_nodesToDelete.count())
+        delete m_nodesToDelete.takeLast();
 
     m_glyph_cache->processPendingGlyphs();
     m_glyph_cache->update();
@@ -182,14 +188,15 @@ void QSGDistanceFieldGlyphNode::updateGeometry()
     Q_ASSERT(m_glyph_cache);
 
     // Remove previously created sub glyph nodes
-    QHash<const QSGDistanceFieldGlyphCache::Texture *, QSGDistanceFieldGlyphNode *>::iterator it = m_subNodes.begin();
-    while (it != m_subNodes.end()) {
-        removeChildNode(it.value());
+    // We assume all the children are sub glyph nodes
+    QSGNode *subnode = firstChild();
+    while (subnode) {
         // We can't delete the node now as it might be in the preprocess list
         // It will be deleted in the next preprocess
-        m_nodesToDelete.append(it.value());
-        it = m_subNodes.erase(it);
+        m_nodesToDelete.append(subnode);
+        subnode = subnode->nextSibling();
     }
+    removeAllChildNodes();
 
     QSGGeometry *g = geometry();
 
@@ -287,25 +294,19 @@ void QSGDistanceFieldGlyphNode::updateGeometry()
 
     QHash<const QSGDistanceFieldGlyphCache::Texture *, GlyphInfo>::const_iterator ite = glyphsInOtherTextures.constBegin();
     while (ite != glyphsInOtherTextures.constEnd()) {
-        QHash<const QSGDistanceFieldGlyphCache::Texture *, QSGDistanceFieldGlyphNode *>::iterator subIt = m_subNodes.find(ite.key());
-        if (subIt == m_subNodes.end()) {
-            QSGDistanceFieldGlyphNode *subNode = new QSGDistanceFieldGlyphNode(m_context);
-            subNode->setOwnerElement(m_ownerElement);
-            subNode->setColor(m_color);
-            subNode->setStyle(m_style);
-            subNode->setStyleColor(m_styleColor);
-            subNode->update();
-            appendChildNode(subNode);
-            subIt = m_subNodes.insert(ite.key(), subNode);
-        }
-
         QGlyphRun subNodeGlyphRun(m_glyphs);
         subNodeGlyphRun.setGlyphIndexes(ite->indexes);
         subNodeGlyphRun.setPositions(ite->positions);
 
-        subIt.value()->setGlyphs(m_originalPosition, subNodeGlyphRun);
-        subIt.value()->update();
-        subIt.value()->updateGeometry(); // we have to explicity call this now as preprocess won't be called before it's rendered
+        QSGDistanceFieldGlyphNode *subNode = new QSGDistanceFieldGlyphNode(m_context);
+        subNode->setGlyphNodeType(SubGlyphNode);
+        subNode->setColor(m_color);
+        subNode->setStyle(m_style);
+        subNode->setStyleColor(m_styleColor);
+        subNode->setGlyphs(m_originalPosition, subNodeGlyphRun);
+        subNode->update();
+        subNode->updateGeometry(); // we have to explicity call this now as preprocess won't be called before it's rendered
+        appendChildNode(subNode);
 
         ++ite;
     }
-- 
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