gfx/2d/NativeFontResource.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   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 "2D.h"
   8 #include "nsIMemoryReporter.h"
   9
  10 namespace mozilla {
  11 namespace gfx {
  12
  13 static Atomic<size_t> gTotalNativeFontResourceData;
  14
  15 NativeFontResource::NativeFontResource(size_t aDataLength)
  16     : mDataLength(aDataLength) {
  17   gTotalNativeFontResourceData += mDataLength;
  18 }
  19
  20 NativeFontResource::~NativeFontResource() {
  21   gTotalNativeFontResourceData -= mDataLength;
  22 }
  23
  24 // Memory reporter that estimates the amount of memory that is currently being
  25 // allocated internally by various native font APIs for native font resources.
  26 // The sanest way to do this, given that NativeFontResources can be created and
  27 // used in many different threads or processes and given that such memory is
  28 // implicitly allocated by the native APIs, is just to maintain a global atomic
  29 // counter and report this value as such.
  30 class NativeFontResourceDataMemoryReporter final : public nsIMemoryReporter {
  31   ~NativeFontResourceDataMemoryReporter() = default;
  32
  33  public:
  34   NS_DECL_ISUPPORTS
  35
  36   NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
  37                             nsISupports* aData, bool aAnonymize) override {
  38     MOZ_COLLECT_REPORT("explicit/gfx/native-font-resource-data", KIND_HEAP,
  39                        UNITS_BYTES, gTotalNativeFontResourceData,
  40                        "Total memory used by native font API resource data.");
  41     return NS_OK;
  42   }
  43 };
  44
  45 NS_IMPL_ISUPPORTS(NativeFontResourceDataMemoryReporter, nsIMemoryReporter)
  46
  47 void NativeFontResource::RegisterMemoryReporter() {
  48   RegisterStrongMemoryReporter(new NativeFontResourceDataMemoryReporter);
  49 }
  50
  51 }  // namespace gfx
  52 }  // namespace mozilla