Implement "Copy image" for canvas (blink side).

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 50 matching lines @@
 #include "core/editing/markup.h"
 #include "core/events/ClipboardEvent.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/ScopedEventQueue.h"
 #include "core/events/TextEvent.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/html/HTMLCanvasElement.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/loader/EmptyClients.h"
 #include "core/page/EditorClient.h"
 #include "core/page/EventHandler.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
@@ skipping 338 matching lines @@
     String html = createMarkup(selectedRange, 0, AnnotateForInterchange, false, ResolveNonLocalURLs);
     KURL url = selectedRange->startContainer()->document().url();
     pasteboard->writeHTML(html, url, plainText, canSmartCopyOrDelete());
 }
 
 static void writeImageNodeToPasteboard(Pasteboard* pasteboard, Node* node, const String& title)
 {
     ASSERT(pasteboard);
     ASSERT(node);
 
-    if (!(node->renderer() && node->renderer()->isImage()))
+    RenderObject* renderer = node->renderer();
+    if (!renderer)
         return;
 
-    RenderImage* renderer = toRenderImage(node->renderer());
-    ImageResource* cachedImage = renderer->cachedImage();
-    if (!cachedImage || cachedImage->errorOccurred())
+    Image* image = 0;
+    if (renderer->isImage()) {
+        RenderImage* renderImage = toRenderImage(renderer);
+        ImageResource* cachedImage = renderImage->cachedImage();
+        if (!cachedImage || cachedImage->errorOccurred())
+            return;
+        image = cachedImage->imageForRenderer(renderImage);
+    } else if (renderer->isCanvas()) {
+        image = toHTMLCanvasElement(node)->copiedImage();
+    } else {
         return;
-    Image* image = cachedImage->imageForRenderer(renderer);
+    }
     ASSERT(image);
 
     // FIXME: This should probably be reconciled with HitTestResult::absoluteImageURL.
     AtomicString urlString;
     if (isHTMLImageElement(*node) || isHTMLInputElement(*node))
         urlString = toElement(node)->getAttribute(srcAttr);
     else if (isSVGImageElement(*node))
         urlString = toElement(node)->getAttribute(XLinkNames::hrefAttr);
     else if (isHTMLEmbedElement(*node) || isHTMLObjectElement(*node))
         urlString = toElement(node)->imageSourceURL();
+    else if (isHTMLCanvasElement(*node))
+        urlString = AtomicString("data:image/png");

[Justin Novosad, 2014/05/09 19:56:38]

This URL does not seem useful. Why not leave urlString empty?

     KURL url = urlString.isEmpty() ? KURL() : node->document().completeURL(stripLeadingAndTrailingHTMLSpaces(urlString));
 
     pasteboard->writeImage(image, url, title);
 }
 
 // Returns whether caller should continue with "the default processing", which is the same as
 // the event handler NOT setting the return value to false
 bool Editor::dispatchCPPEvent(const AtomicString &eventType, ClipboardAccessPolicy policy, PasteMode pasteMode)
 {
     Node* target = findEventTargetFromSelection();
@@ skipping 772 matching lines @@
     return m_frame.spellChecker();
 }
 
 void Editor::toggleOverwriteModeEnabled()
 {
     m_overwriteModeEnabled = !m_overwriteModeEnabled;
     frame().selection().setShouldShowBlockCursor(m_overwriteModeEnabled);
 }
 
 } // namespace WebCore