• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3  * Copyright (C) 2008 Google Inc.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include "config.h"
28 
29 #include "Document.h"
30 #include "FloatRect.h"
31 #include "GraphicsContext.h"
32 #include "ImageBuffer.h"
33 #include "RenderView.h"
34 #include "Settings.h"
35 
36 namespace WebCore {
37 
38 namespace {
39 
40 struct ScopedState {
ScopedStateWebCore::__anoncacc36e10111::ScopedState41     ScopedState(Frame* theFrame, RenderObject* theRenderer)
42         : frame(theFrame)
43         , renderer(theRenderer)
44         , paintBehavior(frame->view()->paintBehavior())
45         , backgroundColor(frame->view()->baseBackgroundColor())
46     {
47     }
48 
~ScopedStateWebCore::__anoncacc36e10111::ScopedState49     ~ScopedState()
50     {
51         if (renderer)
52             renderer->updateDragState(false);
53         frame->view()->setPaintBehavior(paintBehavior);
54         frame->view()->setBaseBackgroundColor(backgroundColor);
55         frame->view()->setNodeToDraw(0);
56     }
57 
58     Frame* frame;
59     RenderObject* renderer;
60     PaintBehavior paintBehavior;
61     Color backgroundColor;
62 };
63 
64 } // namespace
65 
nodeImage(Node * node)66 DragImageRef Frame::nodeImage(Node* node)
67 {
68     RenderObject* renderer = node->renderer();
69     if (!renderer)
70         return 0;
71 
72     const ScopedState state(this, renderer);
73 
74     renderer->updateDragState(true);
75     m_view->setPaintBehavior(state.paintBehavior | PaintBehaviorFlattenCompositingLayers);
76     // When generating the drag image for an element, ignore the document background.
77     m_view->setBaseBackgroundColor(colorWithOverrideAlpha(Color::white, 1.0));
78     m_doc->updateLayout();
79     m_view->setNodeToDraw(node); // Enable special sub-tree drawing mode.
80 
81     IntRect topLevelRect;
82     IntRect paintingRect = renderer->paintingRootRect(topLevelRect);
83 
84     OwnPtr<ImageBuffer> buffer(ImageBuffer::create(paintingRect.size()));
85     if (!buffer)
86         return 0;
87     buffer->context()->translate(-paintingRect.x(), -paintingRect.y());
88     buffer->context()->clip(FloatRect(0, 0, paintingRect.maxX(), paintingRect.maxY()));
89 
90     m_view->paintContents(buffer->context(), paintingRect);
91 
92     RefPtr<Image> image = buffer->copyImage();
93     return createDragImageFromImage(image.get());
94 }
95 
dragImageForSelection()96 DragImageRef Frame::dragImageForSelection()
97 {
98     if (!selection()->isRange())
99         return 0;
100 
101     const ScopedState state(this, 0);
102     m_view->setPaintBehavior(PaintBehaviorSelectionOnly);
103     m_doc->updateLayout();
104 
105     IntRect paintingRect = enclosingIntRect(selection()->bounds());
106 
107     OwnPtr<ImageBuffer> buffer(ImageBuffer::create(paintingRect.size()));
108     if (!buffer)
109         return 0;
110     buffer->context()->translate(-paintingRect.x(), -paintingRect.y());
111     buffer->context()->clip(FloatRect(0, 0, paintingRect.maxX(), paintingRect.maxY()));
112 
113     m_view->paintContents(buffer->context(), paintingRect);
114 
115     RefPtr<Image> image = buffer->copyImage();
116     return createDragImageFromImage(image.get());
117 }
118 
119 } // namespace WebCore
120