From cc6556c62c2e06f6d0b15383165772d06aa26066 Mon Sep 17 00:00:00 2001
From: Charles Yin <charles.yin@nokia.com>
Date: Wed, 7 Mar 2012 09:34:18 +1000
Subject: [PATCH] Repaint the canvas item properly when canvas resized

Task-number:QTBUG-23594
Change-Id: I703a5190b5b306666ffd61001ff94f296399465f
Reviewed-by: Michael Brasser <michael.brasser@nokia.com>
---
 src/quick/items/context2d/qquickcanvasitem.cpp     |   25 +++++++++----------
 .../items/context2d/qquickcontext2dtexture.cpp     |    1 +
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/src/quick/items/context2d/qquickcanvasitem.cpp b/src/quick/items/context2d/qquickcanvasitem.cpp
index e2f57fe..ed16ea0 100644
--- a/src/quick/items/context2d/qquickcanvasitem.cpp
+++ b/src/quick/items/context2d/qquickcanvasitem.cpp
@@ -463,30 +463,29 @@ void QQuickCanvasItem::sceneGraphInitialized()
 void QQuickCanvasItem::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
 {
     Q_D(QQuickCanvasItem);
-    QQuickItem::geometryChanged(newGeometry, oldGeometry);
 
-    const qreal w = newGeometry.width();
-    const qreal h = newGeometry.height();
+    QQuickItem::geometryChanged(newGeometry, oldGeometry);
 
-    if (!d->hasCanvasSize) {
-        d->canvasSize = QSizeF(w, h);
+    QSizeF newSize = newGeometry.size();
+    if (!d->hasCanvasSize && d->canvasSize != newSize) {
+        d->canvasSize = newSize;
         emit canvasSizeChanged();
     }
 
-    if (!d->hasTileSize) {
-        d->tileSize = d->canvasSize.toSize();
+    if (!d->hasTileSize && d->tileSize != newSize) {
+        d->tileSize = newSize.toSize();
         emit tileSizeChanged();
     }
 
-    if (!d->hasCanvasWindow) {
-        d->canvasWindow = QRectF(0, 0, w, h);
+    const QRectF rect = QRectF(QPointF(0, 0), newSize);
+
+    if (!d->hasCanvasWindow && d->canvasWindow != rect) {
+        d->canvasWindow = rect;
         emit canvasWindowChanged();
     }
 
-    if (d->available) {
-        polish();
-        update();
-    }
+    if (d->available)
+        requestPaint();
 }
 
 void QQuickCanvasItem::componentComplete()
diff --git a/src/quick/items/context2d/qquickcontext2dtexture.cpp b/src/quick/items/context2d/qquickcontext2dtexture.cpp
index 60f5854..bdf1471 100644
--- a/src/quick/items/context2d/qquickcontext2dtexture.cpp
+++ b/src/quick/items/context2d/qquickcontext2dtexture.cpp
@@ -177,6 +177,7 @@ void QQuickContext2DTexture::canvasChanged(const QSize& canvasSize, const QSize&
 
     setCanvasSize(canvasSize);
     setTileSize(ts);
+    setCanvasWindow(canvasWindow);
 
     if (canvasSize == canvasWindow.size()) {
         m_tiledCanvas = false;
-- 
1.7.2.5