layout/base/MaskLayerImageCache.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "MaskLayerImageCache.h"
   7 #include "ImageContainer.h"
   8
   9 using namespace mozilla::layers;
  10
  11 namespace mozilla {
  12
  13 MaskLayerImageCache::MaskLayerImageCache()
  14 {
  15   MOZ_COUNT_CTOR(MaskLayerImageCache);
  16 }
  17 MaskLayerImageCache::~MaskLayerImageCache()
  18 {
  19   MOZ_COUNT_DTOR(MaskLayerImageCache);
  20 }
  21
  22
  23 /* static */ PLDHashOperator
  24 MaskLayerImageCache::SweepFunc(MaskLayerImageEntry* aEntry,
  25                                void* aUserArg)
  26 {
  27   const MaskLayerImageCache::MaskLayerImageKey* key = aEntry->mKey;
  28
  29   if (key->mLayerCount == 0) {
  30     return PL_DHASH_REMOVE;
  31   }
  32
  33   return PL_DHASH_NEXT;
  34 }
  35
  36 void
  37 MaskLayerImageCache::Sweep()
  38 {
  39   mMaskImageContainers.EnumerateEntries(SweepFunc, nullptr);
  40 }
  41
  42 ImageContainer*
  43 MaskLayerImageCache::FindImageFor(const MaskLayerImageKey** aKey)
  44 {
  45   if (MaskLayerImageEntry* entry = mMaskImageContainers.GetEntry(**aKey)) {
  46     *aKey = entry->mKey.get();
  47     return entry->mContainer;
  48   }
  49
  50   return nullptr;
  51 }
  52
  53 void
  54 MaskLayerImageCache::PutImage(const MaskLayerImageKey* aKey, ImageContainer* aContainer)
  55 {
  56   MaskLayerImageEntry* entry = mMaskImageContainers.PutEntry(*aKey);
  57   entry->mContainer = aContainer;
  58 }
  59
  60 // This case is particularly 'clever' because it uses AddRef/Release to track the use
  61 // not to release the object.
  62 template<>
  63 struct HasDangerousPublicDestructor<MaskLayerImageCache::MaskLayerImageKey>
  64 {
  65   static const bool value = true;
  66 };
  67
  68 MaskLayerImageCache::MaskLayerImageKey::MaskLayerImageKey()
  69   : mLayerCount(0)
  70   , mRoundedClipRects()
  71 {
  72   MOZ_COUNT_CTOR(MaskLayerImageKey);
  73 }
  74
  75 MaskLayerImageCache::MaskLayerImageKey::MaskLayerImageKey(const MaskLayerImageKey& aKey)
  76   : mLayerCount(aKey.mLayerCount)
  77   , mRoundedClipRects(aKey.mRoundedClipRects)
  78 {
  79   MOZ_COUNT_CTOR(MaskLayerImageKey);
  80 }
  81
  82 MaskLayerImageCache::MaskLayerImageKey::~MaskLayerImageKey()
  83 {
  84   MOZ_COUNT_DTOR(MaskLayerImageKey);
  85 }
  86
  87 }