Imported WebKit commit fce473cb4d55aa9fe9d0b0322a2fffecb731b961 (http://svn.webkit.org/repository/webkit/trunk@106560)

1 files changed, 18 insertions, 1 deletions

diff --git a/Source/WebCore/html/HTMLCanvasElement.cpp b/Source/WebCore/html/HTMLCanvasElement.cpp
index 681fb93ca..143d33475 100644
--- a/Source/WebCore/html/HTMLCanvasElement.cpp
+++ b/Source/WebCore/html/HTMLCanvasElement.cpp
@@ -443,6 +443,22 @@ bool HTMLCanvasElement::shouldAccelerate(const IntSize& size) const
 #endif
 }
 
+bool HTMLCanvasElement::shouldDefer() const
+{
+#if USE(SKIA)
+    if (m_context && !m_context->is2d())
+        return false;
+
+    Settings* settings = document()->settings();
+    if (!settings || !settings->deferred2dCanvasEnabled())
+        return false;
+
+    return true;
+#else
+    return false;
+#endif
+}
+
 void HTMLCanvasElement::createImageBuffer() const
 {
     ASSERT(!m_imageBuffer);
@@ -471,7 +487,8 @@ void HTMLCanvasElement::createImageBuffer() const
 #else
         Unaccelerated;
 #endif
-    m_imageBuffer = ImageBuffer::create(bufferSize, ColorSpaceDeviceRGB, renderingMode);
+    DeferralMode deferralMode = shouldDefer() ? Deferred : NonDeferred;
+    m_imageBuffer = ImageBuffer::create(bufferSize, ColorSpaceDeviceRGB, renderingMode, deferralMode);
     if (!m_imageBuffer)
         return;
     m_imageBuffer->context()->scale(FloatSize(bufferSize.width() / logicalSize.width(), bufferSize.height() / logicalSize.height()));