The Tor Browser: content/canvas/src/ImageData.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 et tw=78: */

     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 file,

     5  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "mozilla/dom/ImageData.h"

     9 #include "mozilla/CheckedInt.h"

    10 #include "mozilla/HoldDropJSObjects.h"

    11 #include "mozilla/dom/ImageDataBinding.h"

    13 #include "jsapi.h"

    15 namespace mozilla {

    16 namespace dom {

    18 NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageData)

    19 NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageData)

    21 NS_IMPL_CYCLE_COLLECTION_CLASS(ImageData)

    23 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageData)

    24   NS_INTERFACE_MAP_ENTRY(nsISupports)

    25 NS_INTERFACE_MAP_END

    27 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)

    28   NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)

    29 NS_IMPL_CYCLE_COLLECTION_TRACE_END

    31 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)

    32   NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS

    33 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

    35 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)

    36   tmp->DropData();

    37 NS_IMPL_CYCLE_COLLECTION_UNLINK_END

    39 //static

    40 ImageData*

    41 ImageData::Constructor(const GlobalObject& aGlobal,

    42                        const uint32_t aWidth,

    43                        const uint32_t aHeight,

    44                        ErrorResult& aRv)

    45 {

    46   if (aWidth == 0 || aHeight == 0) {

    47     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);

    48     return nullptr;

    49   }

    50   CheckedInt<uint32_t> length = CheckedInt<uint32_t>(aWidth) * aHeight * 4;

    51   if (!length.isValid()) {

    52     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);

    53     return nullptr;

    54   }

    55   js::AssertSameCompartment(aGlobal.GetContext(), aGlobal.Get());

    56   JSObject* data = Uint8ClampedArray::Create(aGlobal.GetContext(),

    57                                              length.value());

    58   if (!data) {

    59     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);

    60     return nullptr;

    61   }

    62   return new ImageData(aWidth, aHeight, *data);

    63 }

    65 //static

    66 ImageData*

    67 ImageData::Constructor(const GlobalObject& aGlobal,

    68                        const Uint8ClampedArray& aData,

    69                        const uint32_t aWidth,

    70                        const Optional<uint32_t>& aHeight,

    71                        ErrorResult& aRv)

    72 {

    73   aData.ComputeLengthAndData();

    75   uint32_t length = aData.Length();

    76   if (length == 0 || length % 4) {

    77     aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);

    78     return nullptr;

    79   }

    80   length /= 4;

    81   if (aWidth == 0) {

    82     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);

    83     return nullptr;

    84   }

    85   uint32_t height = length / aWidth;

    86   if (length != aWidth * height ||

    87       (aHeight.WasPassed() && aHeight.Value() != height)) {

    88     aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);

    89     return nullptr;

    90   }

    91   return new ImageData(aWidth, height, *aData.Obj());

    92 }

    94 void

    95 ImageData::HoldData()

    96 {

    97   mozilla::HoldJSObjects(this);

    98 }

   100 void

   101 ImageData::DropData()

   102 {

   103   if (mData) {

   104     mData = nullptr;

   105     mozilla::DropJSObjects(this);

   106   }

   107 }

   109 JSObject*

   110 ImageData::WrapObject(JSContext* cx)

   111 {

   112   return ImageDataBinding::Wrap(cx, this);

   113 }

   115 } // namespace dom

   116 } // namespace mozilla

The Tor Browser / file revision