gfx/layers/ipc/ShadowLayerParent.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=8 et :
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "ShadowLayerParent.h"
   9 #include "Layers.h"                     // for Layer, ContainerLayer
  10 #include "nsDebug.h"                    // for NS_RUNTIMEABORT
  11 #include "nsISupportsImpl.h"            // for Layer::AddRef, etc
  12
  13 #include "mozilla/layers/ThebesLayerComposite.h"
  14 #include "mozilla/layers/CanvasLayerComposite.h"
  15 #include "mozilla/layers/ColorLayerComposite.h"
  16 #include "mozilla/layers/ImageLayerComposite.h"
  17 #include "mozilla/layers/ContainerLayerComposite.h"
  18
  19 namespace mozilla {
  20 namespace layers {
  21
  22 ShadowLayerParent::ShadowLayerParent() : mLayer(nullptr)
  23 {
  24 }
  25
  26 ShadowLayerParent::~ShadowLayerParent()
  27 {
  28 }
  29
  30 void
  31 ShadowLayerParent::Bind(Layer* layer)
  32 {
  33   mLayer = layer;
  34 }
  35
  36 void
  37 ShadowLayerParent::Destroy()
  38 {
  39   // It's possible for Destroy() to come in just after this has been
  40   // created, but just before the transaction in which Bind() would
  41   // have been called.  In that case, we'll ignore shadow-layers
  42   // transactions from there on and never get a layer here.
  43   if (mLayer) {
  44     mLayer->Disconnect();
  45   }
  46 }
  47
  48 ContainerLayerComposite*
  49 ShadowLayerParent::AsContainerLayerComposite() const
  50 {
  51   return mLayer && mLayer->GetType() == Layer::TYPE_CONTAINER
  52          ? static_cast<ContainerLayerComposite*>(mLayer.get())
  53          : nullptr;
  54 }
  55
  56 CanvasLayerComposite*
  57 ShadowLayerParent::AsCanvasLayerComposite() const
  58 {
  59   return mLayer && mLayer->GetType() == Layer::TYPE_CANVAS
  60          ? static_cast<CanvasLayerComposite*>(mLayer.get())
  61          : nullptr;
  62 }
  63
  64 ColorLayerComposite*
  65 ShadowLayerParent::AsColorLayerComposite() const
  66 {
  67   return mLayer && mLayer->GetType() == Layer::TYPE_COLOR
  68          ? static_cast<ColorLayerComposite*>(mLayer.get())
  69          : nullptr;
  70 }
  71
  72 ImageLayerComposite*
  73 ShadowLayerParent::AsImageLayerComposite() const
  74 {
  75   return mLayer && mLayer->GetType() == Layer::TYPE_IMAGE
  76          ? static_cast<ImageLayerComposite*>(mLayer.get())
  77          : nullptr;
  78 }
  79
  80 RefLayerComposite*
  81 ShadowLayerParent::AsRefLayerComposite() const
  82 {
  83   return mLayer && mLayer->GetType() == Layer::TYPE_REF
  84          ? static_cast<RefLayerComposite*>(mLayer.get())
  85          : nullptr;
  86 }
  87
  88 ThebesLayerComposite*
  89 ShadowLayerParent::AsThebesLayerComposite() const
  90 {
  91   return mLayer && mLayer->GetType() == Layer::TYPE_THEBES
  92          ? static_cast<ThebesLayerComposite*>(mLayer.get())
  93          : nullptr;
  94 }
  95
  96 void
  97 ShadowLayerParent::ActorDestroy(ActorDestroyReason why)
  98 {
  99   switch (why) {
 100   case AncestorDeletion:
 101     NS_RUNTIMEABORT("shadow layer deleted out of order!");
 102     return;                     // unreached
 103
 104   case Deletion:
 105     // See comment near Destroy() above.
 106     if (mLayer) {
 107       mLayer->Disconnect();
 108     }
 109     break;
 110
 111   case AbnormalShutdown:
 112     if (mLayer) {
 113       mLayer->Disconnect();
 114     }
 115     break;
 116
 117   case NormalShutdown:
 118     // let IPDL-generated code automatically clean up Shmems and so
 119     // forth; our channel is disconnected anyway
 120     break;
 121
 122   case FailedConstructor:
 123     NS_RUNTIMEABORT("FailedConstructor isn't possible in PLayerTransaction");
 124     return;                     // unreached
 125   }
 126
 127   mLayer = nullptr;
 128 }
 129
 130 } // namespace layers
 131 } // namespace mozilla