widget/nsDragServiceProxy.cpp
author Botond Ballo <botond@mozilla.com>
Thu, 25 Apr 2019 14:33:17 +0000
changeset 530341 4f70b98aa8705b6906b6bd2a3de66d374addb177
parent 529755 9813ce146bc725dd83e8ff6f41bfc36dd17d935b
child 548937 a7ac9f64f6ea3fd6faf7263c18f20c7dae9d20ec
permissions -rw-r--r--
Bug 1546139 - Restore the call to AdjustFixedOrStickyLayer() for layers fixed to the RCD-RSF. r=kats This call served two purposes: (1) scroll the fixed layer by the eVisual transform, and (2) adjust it by the fixed margins. The first purpose is now served by applying the eVisual transform to the async zoom container, but we still need the call for the second purpose. Differential Revision: https://phabricator.services.mozilla.com/D28735

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsDragServiceProxy.h"
#include "mozilla/dom/Document.h"
#include "nsISupportsPrimitives.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "nsContentUtils.h"

using mozilla::CSSIntRegion;
using mozilla::LayoutDeviceIntRect;
using mozilla::Maybe;
using mozilla::dom::BrowserChild;
using mozilla::gfx::DataSourceSurface;
using mozilla::gfx::SourceSurface;
using mozilla::gfx::SurfaceFormat;
using mozilla::ipc::Shmem;

nsDragServiceProxy::nsDragServiceProxy() {}

nsDragServiceProxy::~nsDragServiceProxy() {}

nsresult nsDragServiceProxy::InvokeDragSessionImpl(
    nsIArray* aArrayTransferables, const Maybe<CSSIntRegion>& aRegion,
    uint32_t aActionType) {
  NS_ENSURE_STATE(mSourceDocument->GetDocShell());
  BrowserChild* child = BrowserChild::GetFrom(mSourceDocument->GetDocShell());
  NS_ENSURE_STATE(child);
  nsTArray<mozilla::dom::IPCDataTransfer> dataTransfers;
  nsContentUtils::TransferablesToIPCTransferables(
      aArrayTransferables, dataTransfers, false, child->Manager(), nullptr);

  nsCOMPtr<nsIPrincipal> principal;
  if (mSourceNode) {
    principal = mSourceNode->NodePrincipal();
  }

  LayoutDeviceIntRect dragRect;
  if (mHasImage || mSelection) {
    nsPresContext* pc;
    RefPtr<SourceSurface> surface;
    DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);

    if (surface) {
      RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
      if (dataSurface) {
        size_t length;
        int32_t stride;
        Maybe<Shmem> maybeShm = nsContentUtils::GetSurfaceData(
            dataSurface, &length, &stride, child);
        if (maybeShm.isNothing()) {
          return NS_ERROR_FAILURE;
        }

        auto surfaceData = maybeShm.value();

        // Save the surface data to shared memory.
        if (!surfaceData.IsReadable() || !surfaceData.get<char>()) {
          NS_WARNING("Failed to create shared memory for drag session.");
          return NS_ERROR_FAILURE;
        }

        mozilla::Unused << child->SendInvokeDragSession(
            dataTransfers, aActionType, Some(std::move(surfaceData)), stride,
            dataSurface->GetFormat(), dragRect, IPC::Principal(principal));
        StartDragSession();
        return NS_OK;
      }
    }
  }

  mozilla::Unused << child->SendInvokeDragSession(
      dataTransfers, aActionType, Nothing(), 0, static_cast<SurfaceFormat>(0),
      dragRect, IPC::Principal(principal));
  StartDragSession();
  return NS_OK;
}