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/*
* Copyright (C) 2007 Apple Inc. All rights reserved.
*
* 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 APPLE INC. ``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 APPLE INC. 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 "DragImage.h"
#include "Frame.h"
#include "FrameSnapshotting.h"
#include "FrameView.h"
#include "ImageBuffer.h"
#include "Range.h"
#include "RenderObject.h"
#include "RenderView.h"
namespace WebCore {
DragImageRef fitDragImageToMaxSize(DragImageRef image, const IntSize& layoutSize, const IntSize& maxSize)
{
float heightResizeRatio = 0.0f;
float widthResizeRatio = 0.0f;
float resizeRatio = -1.0f;
IntSize originalSize = dragImageSize(image);
if (layoutSize.width() > maxSize.width()) {
widthResizeRatio = maxSize.width() / (float)layoutSize.width();
resizeRatio = widthResizeRatio;
}
if (layoutSize.height() > maxSize.height()) {
heightResizeRatio = maxSize.height() / (float)layoutSize.height();
if ((resizeRatio < 0.0f) || (resizeRatio > heightResizeRatio))
resizeRatio = heightResizeRatio;
}
if (layoutSize == originalSize)
return resizeRatio > 0.0f ? scaleDragImage(image, FloatSize(resizeRatio, resizeRatio)) : image;
// The image was scaled in the webpage so at minimum we must account for that scaling.
float scaleX = layoutSize.width() / (float)originalSize.width();
float scaleY = layoutSize.height() / (float)originalSize.height();
if (resizeRatio > 0.0f) {
scaleX *= resizeRatio;
scaleY *= resizeRatio;
}
return scaleDragImage(image, FloatSize(scaleX, scaleY));
}
struct ScopedNodeDragEnabler {
ScopedNodeDragEnabler(Frame& frame, Node& node)
: frame(frame)
, node(node)
{
if (node.renderer())
node.renderer()->updateDragState(true);
frame.document()->updateLayout();
}
~ScopedNodeDragEnabler()
{
if (node.renderer())
node.renderer()->updateDragState(false);
}
const Frame& frame;
const Node& node;
};
static DragImageRef createDragImageFromSnapshot(std::unique_ptr<ImageBuffer> snapshot, Node* node)
{
if (!snapshot)
return nullptr;
ImageOrientationDescription orientation;
#if ENABLE(CSS_IMAGE_ORIENTATION)
if (node) {
RenderObject* renderer = node->renderer();
if (!renderer)
return nullptr;
orientation.setRespectImageOrientation(renderer->shouldRespectImageOrientation());
orientation.setImageOrientationEnum(renderer->style().imageOrientation());
}
#else
UNUSED_PARAM(node);
#endif
RefPtr<Image> image = ImageBuffer::sinkIntoImage(WTFMove(snapshot), Unscaled);
if (!image)
return nullptr;
return createDragImageFromImage(image.get(), orientation);
}
DragImageRef createDragImageForNode(Frame& frame, Node& node)
{
ScopedNodeDragEnabler enableDrag(frame, node);
return createDragImageFromSnapshot(snapshotNode(frame, node), &node);
}
DragImageRef createDragImageForSelection(Frame& frame, bool forceBlackText)
{
SnapshotOptions options = forceBlackText ? SnapshotOptionsForceBlackText : SnapshotOptionsNone;
return createDragImageFromSnapshot(snapshotSelection(frame, options), nullptr);
}
struct ScopedFrameSelectionState {
ScopedFrameSelectionState(Frame& frame)
: frame(frame)
{
if (RenderView* root = frame.contentRenderer())
root->getSelection(startRenderer, startOffset, endRenderer, endOffset);
}
~ScopedFrameSelectionState()
{
if (RenderView* root = frame.contentRenderer())
root->setSelection(startRenderer, startOffset, endRenderer, endOffset, RenderView::RepaintNothing);
}
const Frame& frame;
RenderObject* startRenderer;
RenderObject* endRenderer;
int startOffset;
int endOffset;
};
DragImageRef createDragImageForRange(Frame& frame, Range& range, bool forceBlackText)
{
frame.document()->updateLayout();
RenderView* view = frame.contentRenderer();
if (!view)
return nullptr;
// To snapshot the range, temporarily select it and take selection snapshot.
Position start = range.startPosition();
Position candidate = start.downstream();
if (candidate.deprecatedNode() && candidate.deprecatedNode()->renderer())
start = candidate;
Position end = range.endPosition();
candidate = end.upstream();
if (candidate.deprecatedNode() && candidate.deprecatedNode()->renderer())
end = candidate;
if (start.isNull() || end.isNull() || start == end)
return nullptr;
const ScopedFrameSelectionState selectionState(frame);
RenderObject* startRenderer = start.deprecatedNode()->renderer();
RenderObject* endRenderer = end.deprecatedNode()->renderer();
if (!startRenderer || !endRenderer)
return nullptr;
SnapshotOptions options = SnapshotOptionsPaintSelectionOnly | (forceBlackText ? SnapshotOptionsForceBlackText : SnapshotOptionsNone);
view->setSelection(startRenderer, start.deprecatedEditingOffset(), endRenderer, end.deprecatedEditingOffset(), RenderView::RepaintNothing);
// We capture using snapshotFrameRect() because we fake up the selection using
// FrameView but snapshotSelection() uses the selection from the Frame itself.
return createDragImageFromSnapshot(snapshotFrameRect(frame, view->selectionBounds(), options), nullptr);
}
DragImageRef createDragImageForImage(Frame& frame, Node& node, IntRect& imageRect, IntRect& elementRect)
{
ScopedNodeDragEnabler enableDrag(frame, node);
RenderObject* renderer = node.renderer();
if (!renderer)
return nullptr;
// Calculate image and element metrics for the client, then create drag image.
LayoutRect topLevelRect;
IntRect paintingRect = snappedIntRect(renderer->paintingRootRect(topLevelRect));
if (paintingRect.isEmpty())
return nullptr;
elementRect = snappedIntRect(topLevelRect);
imageRect = paintingRect;
return createDragImageFromSnapshot(snapshotNode(frame, node), &node);
}
#if !PLATFORM(COCOA) && !PLATFORM(WIN)
DragImageRef createDragImageForLink(URL&, const String&, FontRenderingMode)
{
return nullptr;
}
#endif
} // namespace WebCore
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