1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/src/ImageData.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,116 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 et tw=78: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.8 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "mozilla/dom/ImageData.h"
1.11 +
1.12 +#include "mozilla/CheckedInt.h"
1.13 +#include "mozilla/HoldDropJSObjects.h"
1.14 +#include "mozilla/dom/ImageDataBinding.h"
1.15 +
1.16 +#include "jsapi.h"
1.17 +
1.18 +namespace mozilla {
1.19 +namespace dom {
1.20 +
1.21 +NS_IMPL_CYCLE_COLLECTING_ADDREF(ImageData)
1.22 +NS_IMPL_CYCLE_COLLECTING_RELEASE(ImageData)
1.23 +
1.24 +NS_IMPL_CYCLE_COLLECTION_CLASS(ImageData)
1.25 +
1.26 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ImageData)
1.27 + NS_INTERFACE_MAP_ENTRY(nsISupports)
1.28 +NS_INTERFACE_MAP_END
1.29 +
1.30 +NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ImageData)
1.31 + NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mData)
1.32 +NS_IMPL_CYCLE_COLLECTION_TRACE_END
1.33 +
1.34 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ImageData)
1.35 + NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
1.36 +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
1.37 +
1.38 +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ImageData)
1.39 + tmp->DropData();
1.40 +NS_IMPL_CYCLE_COLLECTION_UNLINK_END
1.41 +
1.42 +//static
1.43 +ImageData*
1.44 +ImageData::Constructor(const GlobalObject& aGlobal,
1.45 + const uint32_t aWidth,
1.46 + const uint32_t aHeight,
1.47 + ErrorResult& aRv)
1.48 +{
1.49 + if (aWidth == 0 || aHeight == 0) {
1.50 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.51 + return nullptr;
1.52 + }
1.53 + CheckedInt<uint32_t> length = CheckedInt<uint32_t>(aWidth) * aHeight * 4;
1.54 + if (!length.isValid()) {
1.55 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.56 + return nullptr;
1.57 + }
1.58 + js::AssertSameCompartment(aGlobal.GetContext(), aGlobal.Get());
1.59 + JSObject* data = Uint8ClampedArray::Create(aGlobal.GetContext(),
1.60 + length.value());
1.61 + if (!data) {
1.62 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.63 + return nullptr;
1.64 + }
1.65 + return new ImageData(aWidth, aHeight, *data);
1.66 +}
1.67 +
1.68 +//static
1.69 +ImageData*
1.70 +ImageData::Constructor(const GlobalObject& aGlobal,
1.71 + const Uint8ClampedArray& aData,
1.72 + const uint32_t aWidth,
1.73 + const Optional<uint32_t>& aHeight,
1.74 + ErrorResult& aRv)
1.75 +{
1.76 + aData.ComputeLengthAndData();
1.77 +
1.78 + uint32_t length = aData.Length();
1.79 + if (length == 0 || length % 4) {
1.80 + aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
1.81 + return nullptr;
1.82 + }
1.83 + length /= 4;
1.84 + if (aWidth == 0) {
1.85 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.86 + return nullptr;
1.87 + }
1.88 + uint32_t height = length / aWidth;
1.89 + if (length != aWidth * height ||
1.90 + (aHeight.WasPassed() && aHeight.Value() != height)) {
1.91 + aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
1.92 + return nullptr;
1.93 + }
1.94 + return new ImageData(aWidth, height, *aData.Obj());
1.95 +}
1.96 +
1.97 +void
1.98 +ImageData::HoldData()
1.99 +{
1.100 + mozilla::HoldJSObjects(this);
1.101 +}
1.102 +
1.103 +void
1.104 +ImageData::DropData()
1.105 +{
1.106 + if (mData) {
1.107 + mData = nullptr;
1.108 + mozilla::DropJSObjects(this);
1.109 + }
1.110 +}
1.111 +
1.112 +JSObject*
1.113 +ImageData::WrapObject(JSContext* cx)
1.114 +{
1.115 + return ImageDataBinding::Wrap(cx, this);
1.116 +}
1.117 +
1.118 +} // namespace dom
1.119 +} // namespace mozilla
