Home | History | Annotate | Download | only in chromium 
      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 {
     41     ScopedState(Frame* theFrame, RenderObject* theRenderer)
     42         : frame(theFrame)
     43         , renderer(theRenderer)
     44         , paintBehavior(frame->view()->paintBehavior())
     45         , backgroundColor(frame->view()->baseBackgroundColor())
     46     {
     47     }
     48 
     49     ~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 
     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 
     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