Apply the QStaticText text-caching strategy for QML

QML cannot use QStaticText directly as it doesn't support caching a
QTextLayout.  QDeclarativeTextLayout is basically a copy of QStaticText
that adds this support.

Currently this feature is disabled by default (enable with
QML_DISABLE_IMAGE_CACHE=1) while we double check the perf consequences
of this change.

Task-number: QTBUG-14050

1 files changed, 23 insertions, 0 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativetextlayout_p.h b/src/declarative/graphicsitems/qdeclarativetextlayout_p.h
new file mode 100644
index 0000000..1a4473d
--- /dev/null
+++ b/src/declarative/graphicsitems/qdeclarativetextlayout_p.h
@@ -0,0 +1,23 @@
+#ifndef QDECLARATIVETEXTLAYOUT_P_H
+#define QDECLARATIVETEXTLAYOUT_P_H
+
+#include <QtGui/qtextlayout.h>
+
+class QDeclarativeTextLayoutPrivate;
+class QDeclarativeTextLayout : public QTextLayout
+{
+public:
+    QDeclarativeTextLayout();
+    QDeclarativeTextLayout(const QString &);
+    ~QDeclarativeTextLayout();
+
+    void beginLayout();
+
+    void prepare();
+    void draw(QPainter *, const QPointF & = QPointF());
+
+private:
+    QDeclarativeTextLayoutPrivate *d;
+};
+
+#endif // QDECLARATIVETEXTLAYOUT_P_H