Source/WebKit/WebProcess/WebCoreSupport/gtk/WebDragClientGtk.cpp

/*
 * Copyright (C) 2011 Igalia S.L.
 *
 * 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. AND ITS 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 APPLE INC. OR ITS 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 "WebDragClient.h"

#if ENABLE(DRAG_SUPPORT)

#include "ArgumentCodersGtk.h"
#include "ShareableBitmap.h"
#include "WebPage.h"
#include "WebPageProxyMessages.h"
#include "WebSelectionData.h"
#include <WebCore/CairoOperations.h>
#include <WebCore/DataTransfer.h>
#include <WebCore/DragData.h>
#include <WebCore/GraphicsContext.h>
#include <WebCore/Pasteboard.h>
#include <WebCore/PlatformContextCairo.h>
#include <cairo.h>

namespace WebKit {
using namespace WebCore;

static RefPtr<ShareableBitmap> convertCairoSurfaceToShareableBitmap(cairo_surface_t* surface)
{
    if (!surface)
        return nullptr;

    IntSize imageSize(cairo_image_surface_get_width(surface), cairo_image_surface_get_height(surface));
    auto bitmap = ShareableBitmap::createShareable(imageSize, { });
    auto graphicsContext = bitmap->createGraphicsContext();

    ASSERT(graphicsContext->hasPlatformContext());
    auto& state = graphicsContext->state();
    Cairo::drawSurface(*graphicsContext->platformContext(), surface, IntRect(IntPoint(), imageSize), IntRect(IntPoint(), imageSize), state.imageInterpolationQuality, state.alpha, Cairo::ShadowState(state));
    return bitmap;
}

void WebDragClient::didConcludeEditDrag()
{
}

void WebDragClient::startDrag(DragItem item, DataTransfer& dataTransfer, Frame&)
{
    auto& dragImage = item.image;
    RefPtr<ShareableBitmap> bitmap = convertCairoSurfaceToShareableBitmap(dragImage.get().get());
    ShareableBitmap::Handle handle;

    // If we have a bitmap, but cannot create a handle to it, we fail early.
    if (bitmap && !bitmap->createHandle(handle))
        return;

    m_page->willStartDrag();

    WebSelectionData selection(dataTransfer.pasteboard().selectionData());
    m_page->send(Messages::WebPageProxy::StartDrag(selection, dataTransfer.sourceOperation(), handle));
}

}; // namespace WebKit.

#endif // ENABLE(DRAG_SUPPORT)