Merge 104782 - Repaint all graphics layers when their renderer offset changes

Source/WebCore/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #include "config.h"
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "GraphicsLayer.h"
 
 #include "FloatPoint.h"
+#include "GraphicsContext.h"
+#include "LayoutTypes.h"
 #include "RotateTransformOperation.h"
 #include "TextStream.h"
 #include <wtf/text/CString.h>
 #include <wtf/text/WTFString.h>
 
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
 
 namespace WebCore {
@@ skipping 210 matching lines @@
 }
 
 void GraphicsLayer::setReplicatedByLayer(GraphicsLayer* layer)
 {
     if (layer)
         layer->setReplicatedLayer(this);
 
     m_replicaLayer = layer;
 }
 
+void GraphicsLayer::setOffsetFromRenderer(const IntSize& offset)
+{
+    if (offset == m_offsetFromRenderer)
+        return;
+
+    m_offsetFromRenderer = offset;
+
+    // If the compositing layer offset changes, we need to repaint.
+    setNeedsDisplay();
+}
+
 void GraphicsLayer::setBackgroundColor(const Color& color)
 {
     m_backgroundColor = color;
     m_backgroundColorSet = true;
 }
 
 void GraphicsLayer::clearBackgroundColor()
 {
     m_backgroundColor = Color();
     m_backgroundColorSet = false;
 }
 
 void GraphicsLayer::paintGraphicsLayerContents(GraphicsContext& context, const IntRect& clip)
 {
 #ifndef NDEBUG
     s_inPaintContents = true;
 #endif
-    if (m_client)
-        m_client->paintContents(this, context, m_paintingPhase, clip);
+    if (m_client) {
+        LayoutSize offset = offsetFromRenderer();
+        context.translate(-offset);
+
+        LayoutRect clipRect(clip);
+        clipRect.move(offset);
+
+        m_client->paintContents(this, context, m_paintingPhase, clipRect);
+    }
 #ifndef NDEBUG
     s_inPaintContents = false;
 #endif
 }
 
 String GraphicsLayer::animationNameForTransition(AnimatedPropertyID property)
 {
     // | is not a valid identifier character in CSS, so this can never conflict with a keyframe identifier.
     String id = "-|transition";
     id.append(static_cast<char>(property));
@@ skipping 296 matching lines @@
 {
     if (!layer)
         return;
 
     WTF::String output = layer->layerTreeAsText(LayerTreeAsTextDebug);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif
 
 #endif // USE(ACCELERATED_COMPOSITING)