widget/nsDragServiceProxy.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsDragServiceProxy.h"
   8 #include "mozilla/dom/Document.h"
   9 #include "mozilla/dom/BrowserChild.h"
  10 #include "mozilla/gfx/2D.h"
  11 #include "mozilla/net/CookieJarSettings.h"
  12 #include "mozilla/UniquePtr.h"
  13 #include "mozilla/Unused.h"
  14 #include "nsContentUtils.h"
  15
  16 using mozilla::CSSIntRegion;
  17 using mozilla::LayoutDeviceIntRect;
  18 using mozilla::Maybe;
  19 using mozilla::Nothing;
  20 using mozilla::Some;
  21 using mozilla::dom::BrowserChild;
  22 using mozilla::gfx::DataSourceSurface;
  23 using mozilla::gfx::SourceSurface;
  24 using mozilla::gfx::SurfaceFormat;
  25 using mozilla::ipc::Shmem;
  26
  27 nsDragServiceProxy::nsDragServiceProxy() = default;
  28
  29 nsDragServiceProxy::~nsDragServiceProxy() = default;
  30
  31 nsresult nsDragServiceProxy::InvokeDragSessionImpl(
  32     nsIArray* aArrayTransferables, const Maybe<CSSIntRegion>& aRegion,
  33     uint32_t aActionType) {
  34   NS_ENSURE_STATE(mSourceDocument->GetDocShell());
  35   BrowserChild* child = BrowserChild::GetFrom(mSourceDocument->GetDocShell());
  36   NS_ENSURE_STATE(child);
  37   nsTArray<mozilla::dom::IPCTransferableData> transferables;
  38   nsContentUtils::TransferablesToIPCTransferableDatas(
  39       aArrayTransferables, transferables, false, nullptr);
  40
  41   nsCOMPtr<nsIPrincipal> principal;
  42   if (mSourceNode) {
  43     principal = mSourceNode->NodePrincipal();
  44   }
  45
  46   nsCOMPtr<nsIContentSecurityPolicy> csp;
  47   if (mSourceDocument) {
  48     csp = mSourceDocument->GetCsp();
  49     // XXX why do we need this here? Shouldn't they be set properly in
  50     // nsBaseDragService already?
  51     mSourceWindowContext = mSourceDocument->GetWindowContext();
  52     mSourceTopWindowContext = mSourceWindowContext
  53                                   ? mSourceWindowContext->TopWindowContext()
  54                                   : nullptr;
  55   }
  56
  57   nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
  58   cookieJarSettings = mSourceDocument->CookieJarSettings();
  59   mozilla::net::CookieJarSettingsArgs csArgs;
  60   mozilla::net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(csArgs);
  61
  62   LayoutDeviceIntRect dragRect;
  63   if (mHasImage || mSelection) {
  64     nsPresContext* pc;
  65     RefPtr<SourceSurface> surface;
  66     DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);
  67
  68     if (surface) {
  69       RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
  70       if (dataSurface) {
  71         size_t length;
  72         int32_t stride;
  73         auto surfaceData =
  74             nsContentUtils::GetSurfaceData(*dataSurface, &length, &stride);
  75         if (surfaceData.isNothing()) {
  76           NS_WARNING("Failed to create shared memory for drag session.");
  77           return NS_ERROR_FAILURE;
  78         }
  79
  80         mozilla::Unused << child->SendInvokeDragSession(
  81             std::move(transferables), aActionType, std::move(surfaceData),
  82             stride, dataSurface->GetFormat(), dragRect, principal, csp, csArgs,
  83             mSourceWindowContext, mSourceTopWindowContext);
  84         StartDragSession();
  85         return NS_OK;
  86       }
  87     }
  88   }
  89
  90   mozilla::Unused << child->SendInvokeDragSession(
  91       std::move(transferables), aActionType, Nothing(), 0,
  92       static_cast<SurfaceFormat>(0), dragRect, principal, csp, csArgs,
  93       mSourceWindowContext, mSourceTopWindowContext);
  94   StartDragSession();
  95   return NS_OK;
  96 }