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/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2013 University of Washington.
*
* 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
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FrameSnapshotting.h"
#include "Document.h"
#include "Frame.h"
#include "FrameSelection.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "Page.h"
#include "RenderObject.h"
#include "Settings.h"
namespace WebCore {
struct ScopedFramePaintingState {
ScopedFramePaintingState(Frame& frame, Node* node)
: frame(frame)
, node(node)
, paintBehavior(frame.view()->paintBehavior())
, backgroundColor(frame.view()->baseBackgroundColor())
{
ASSERT(!node || node->renderer());
}
~ScopedFramePaintingState()
{
frame.view()->setPaintBehavior(paintBehavior);
frame.view()->setBaseBackgroundColor(backgroundColor);
frame.view()->setNodeToDraw(nullptr);
}
const Frame& frame;
const Node* node;
const PaintBehavior paintBehavior;
const Color backgroundColor;
};
std::unique_ptr<ImageBuffer> snapshotFrameRect(Frame& frame, const IntRect& imageRect, SnapshotOptions options)
{
if (!frame.page())
return nullptr;
frame.document()->updateLayout();
FrameView::SelectionInSnapshot shouldIncludeSelection = FrameView::IncludeSelection;
if (options & SnapshotOptionsExcludeSelectionHighlighting)
shouldIncludeSelection = FrameView::ExcludeSelection;
FrameView::CoordinateSpaceForSnapshot coordinateSpace = FrameView::DocumentCoordinates;
if (options & SnapshotOptionsInViewCoordinates)
coordinateSpace = FrameView::ViewCoordinates;
ScopedFramePaintingState state(frame, nullptr);
PaintBehavior paintBehavior = state.paintBehavior;
if (options & SnapshotOptionsForceBlackText)
paintBehavior |= PaintBehaviorForceBlackText;
if (options & SnapshotOptionsPaintSelectionOnly)
paintBehavior |= PaintBehaviorSelectionOnly;
if (options & SnapshotOptionsPaintSelectionAndBackgroundsOnly)
paintBehavior |= PaintBehaviorSelectionAndBackgroundsOnly;
// Other paint behaviors are set by paintContentsForSnapshot.
frame.view()->setPaintBehavior(paintBehavior);
float scaleFactor = frame.page()->deviceScaleFactor();
if (frame.settings().delegatesPageScaling())
scaleFactor *= frame.page()->pageScaleFactor();
std::unique_ptr<ImageBuffer> buffer = ImageBuffer::create(imageRect.size(), Unaccelerated, scaleFactor);
if (!buffer)
return nullptr;
buffer->context().translate(-imageRect.x(), -imageRect.y());
frame.view()->paintContentsForSnapshot(buffer->context(), imageRect, shouldIncludeSelection, coordinateSpace);
return buffer;
}
std::unique_ptr<ImageBuffer> snapshotSelection(Frame& frame, SnapshotOptions options)
{
auto& selection = frame.selection();
if (!selection.isRange())
return nullptr;
FloatRect selectionBounds = selection.selectionBounds();
// It is possible for the selection bounds to be empty; see https://bugs.webkit.org/show_bug.cgi?id=56645.
if (selectionBounds.isEmpty())
return nullptr;
options |= SnapshotOptionsPaintSelectionOnly;
return snapshotFrameRect(frame, enclosingIntRect(selectionBounds), options);
}
std::unique_ptr<ImageBuffer> snapshotNode(Frame& frame, Node& node)
{
if (!node.renderer())
return nullptr;
ScopedFramePaintingState state(frame, &node);
frame.view()->setBaseBackgroundColor(Color::transparent);
frame.view()->setNodeToDraw(&node);
LayoutRect topLevelRect;
return snapshotFrameRect(frame, snappedIntRect(node.renderer()->paintingRootRect(topLevelRect)));
}
} // namespace WebCore
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