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::IPCDataTransfer> dataTransfers;
  38   nsContentUtils::TransferablesToIPCTransferables(
  39       aArrayTransferables, dataTransfers, false, child->Manager(), 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     mSourceWindowContext = mSourceDocument->GetWindowContext();
  50   }
  51
  52   nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
  53   cookieJarSettings = mSourceDocument->CookieJarSettings();
  54   mozilla::net::CookieJarSettingsArgs csArgs;
  55   mozilla::net::CookieJarSettings::Cast(cookieJarSettings)->Serialize(csArgs);
  56
  57   LayoutDeviceIntRect dragRect;
  58   if (mHasImage || mSelection) {
  59     nsPresContext* pc;
  60     RefPtr<SourceSurface> surface;
  61     DrawDrag(mSourceNode, aRegion, mScreenPosition, &dragRect, &surface, &pc);
  62
  63     if (surface) {
  64       RefPtr<DataSourceSurface> dataSurface = surface->GetDataSurface();
  65       if (dataSurface) {
  66         size_t length;
  67         int32_t stride;
  68         Maybe<Shmem> maybeShm = nsContentUtils::GetSurfaceData(
  69             *dataSurface, &length, &stride, child);
  70         if (maybeShm.isNothing()) {
  71           return NS_ERROR_FAILURE;
  72         }
  73
  74         auto surfaceData = maybeShm.value();
  75
  76         // Save the surface data to shared memory.
  77         if (!surfaceData.IsReadable() || !surfaceData.get<char>()) {
  78           NS_WARNING("Failed to create shared memory for drag session.");
  79           return NS_ERROR_FAILURE;
  80         }
  81
  82         mozilla::Unused << child->SendInvokeDragSession(
  83             dataTransfers, aActionType, Some(std::move(surfaceData)), stride,
  84             dataSurface->GetFormat(), dragRect, principal, csp, csArgs,
  85             mSourceWindowContext);
  86         StartDragSession();
  87         return NS_OK;
  88       }
  89     }
  90   }
  91
  92   mozilla::Unused << child->SendInvokeDragSession(
  93       dataTransfers, aActionType, Nothing(), 0, static_cast<SurfaceFormat>(0),
  94       dragRect, principal, csp, csArgs, mSourceWindowContext);
  95   StartDragSession();
  96   return NS_OK;
  97 }