content/canvas/src/ImageData.cpp@deefc01c0e14
content/canvas/src/ImageData.cpp
Thu, 15 Jan 2015 21:03:48 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 21:03:48 +0100
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
- permissions
- -rw-r--r--
Integrate friendly tips from Tor colleagues to make (or not) 4.5 alpha 3;
This includes removal of overloaded (but unused) methods, and addition of
a overlooked call to DataStruct::SetData(nsISupports, uint32_t, bool.)
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
