6 files changed, 45 insertions, 2 deletions

diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp
index b83dbc0..eab02e1 100644
--- a/src/gui/painting/qtextureglyphcache.cpp
+++ b/src/gui/painting/qtextureglyphcache.cpp
@@ -238,6 +238,11 @@ bool QTextureGlyphCache::populate(QFontEngine *fontEngine, int numGlyphs, const
             }
         }
 
+        if (maxTextureHeight() > 0 && m_cy + c.h > maxTextureHeight()) {
+            // We can't make a cache of the required size, so we bail out
+            return false;
+        }
+
         c.x = m_cx;
         c.y = m_cy;
 
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index a134078..1fa02e1 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -1581,8 +1581,13 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyp
     // cache so this text is performed before we test if the cache size has changed.
     if (recreateVertexArrays) {
         cache->setPaintEnginePrivate(this);
-        cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
-                        staticTextItem->glyphs, staticTextItem->glyphPositions);
+        if (!cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
+                             staticTextItem->glyphs, staticTextItem->glyphPositions)) {
+            // No space for glyphs in cache. We need to reset it and try again.
+            cache->clear();
+            cache->populate(staticTextItem->fontEngine(), staticTextItem->numGlyphs,
+                            staticTextItem->glyphs, staticTextItem->glyphPositions);
+        }
         cache->fillInPendingGlyphs();
     }
 
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
index 9e8e828..c867d60 100644
--- a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp
@@ -378,4 +378,19 @@ int QGLTextureGlyphCache::maxTextureHeight() const
     else
         return ctx->d_ptr->maxTextureSize();
 }
+
+void QGLTextureGlyphCache::clear()
+{
+    if (ctx != 0) {
+        m_textureResource.cleanup(ctx);
+
+        m_w = 0;
+        m_h = 0;
+        m_cx = 0;
+        m_cy = 0;
+        m_currentRowHeight = 0;
+        coords.clear();
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
index cc6de28..133289e 100644
--- a/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl_p.h
@@ -142,6 +142,8 @@ public:
     FilterMode filterMode() const { return m_filterMode; }
     void setFilterMode(FilterMode m) { m_filterMode = m; }
 
+    void clear();
+
     void freeResource(void *) { ctx = 0; }
 
 private:
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 19858e7..4698a5c 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -5606,6 +5606,21 @@ void *QGLContextGroupResourceBase::value(const QGLContext *context)
     return group->m_resources.value(this, 0);
 }
 
+void QGLContextGroupResourceBase::cleanup(const QGLContext *ctx)
+{
+    void *resource = value(ctx);
+
+    if (resource != 0) {
+        QGLShareContextScope scope(ctx);
+        freeResource(resource);
+
+        QGLContextGroup *group = QGLContextPrivate::contextGroup(ctx);
+        group->m_resources.remove(this);
+        m_groups.removeOne(group);
+        active.deref();
+    }
+}
+
 void QGLContextGroupResourceBase::cleanup(const QGLContext *ctx, void *value)
 {
 #ifdef QT_GL_CONTEXT_RESOURCE_DEBUG
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index 5a5e5cc..b2261a2 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -687,6 +687,7 @@ public:
     virtual ~QGLContextGroupResourceBase();
     void insert(const QGLContext *context, void *value);
     void *value(const QGLContext *context);
+    void cleanup(const QGLContext *context);
     void cleanup(const QGLContext *context, void *value);
     virtual void freeResource(void *value) = 0;