1/*
2 * Copyright (C) 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "core/html/ImageData.h"
31
32#include "bindings/core/v8/ExceptionState.h"
33#include "bindings/core/v8/custom/V8Uint8ClampedArrayCustom.h"
34#include "core/dom/ExceptionCode.h"
35#include "platform/RuntimeEnabledFeatures.h"
36
37namespace blink {
38
39PassRefPtrWillBeRawPtr<ImageData> ImageData::create(const IntSize& size)
40{
41    Checked<int, RecordOverflow> dataSize = 4;
42    dataSize *= size.width();
43    dataSize *= size.height();
44    if (dataSize.hasOverflowed())
45        return nullptr;
46
47    return adoptRefWillBeNoop(new ImageData(size));
48}
49
50PassRefPtrWillBeRawPtr<ImageData> ImageData::create(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
51{
52    Checked<int, RecordOverflow> dataSize = 4;
53    dataSize *= size.width();
54    dataSize *= size.height();
55    if (dataSize.hasOverflowed())
56        return nullptr;
57
58    if (dataSize.unsafeGet() < 0
59        || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
60        return nullptr;
61
62    return adoptRefWillBeNoop(new ImageData(size, byteArray));
63}
64
65PassRefPtrWillBeRawPtr<ImageData> ImageData::create(unsigned width, unsigned height, ExceptionState& exceptionState)
66{
67    if (!RuntimeEnabledFeatures::imageDataConstructorEnabled()) {
68        exceptionState.throwTypeError("Illegal constructor");
69        return nullptr;
70    }
71    if (!width || !height) {
72        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s is zero or not a number.", width ? "height" : "width"));
73        return nullptr;
74    }
75
76    Checked<unsigned, RecordOverflow> dataSize = 4;
77    dataSize *= width;
78    dataSize *= height;
79    if (dataSize.hasOverflowed()) {
80        exceptionState.throwDOMException(IndexSizeError, "The requested image size exceeds the supported range.");
81        return nullptr;
82    }
83
84    RefPtrWillBeRawPtr<ImageData> imageData = adoptRefWillBeNoop(new ImageData(IntSize(width, height)));
85    imageData->data()->zeroFill();
86    return imageData.release();
87}
88
89PassRefPtrWillBeRawPtr<ImageData> ImageData::create(Uint8ClampedArray* data, unsigned width, unsigned height, ExceptionState& exceptionState)
90{
91    if (!RuntimeEnabledFeatures::imageDataConstructorEnabled()) {
92        exceptionState.throwTypeError("Illegal constructor");
93        return nullptr;
94    }
95    if (!data) {
96        exceptionState.throwTypeError("Expected a Uint8ClampedArray as first argument.");
97        return nullptr;
98    }
99    if (!width) {
100        exceptionState.throwDOMException(IndexSizeError, "The source width is zero or not a number.");
101        return nullptr;
102    }
103
104    unsigned length = data->length();
105    if (!length) {
106        exceptionState.throwDOMException(IndexSizeError, "The input data has a zero byte length.");
107        return nullptr;
108    }
109    if (length % 4) {
110        exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of 4.");
111        return nullptr;
112    }
113    length /= 4;
114    if (length % width) {
115        exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of (4 * width).");
116        return nullptr;
117    }
118    if (!height) {
119        height = length / width;
120    } else if (height != length / width) {
121        exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not equal to (4 * width * height).");
122        return nullptr;
123    }
124
125    return adoptRefWillBeNoop(new ImageData(IntSize(width, height), data));
126}
127
128v8::Handle<v8::Object> ImageData::associateWithWrapper(const WrapperTypeInfo* wrapperType, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate)
129{
130    ScriptWrappable::associateWithWrapper(wrapperType, wrapper, isolate);
131
132    if (!wrapper.IsEmpty()) {
133        // Create a V8 Uint8ClampedArray object.
134        v8::Handle<v8::Value> pixelArray = toV8(data(), wrapper, isolate);
135        // Set the "data" property of the ImageData object to
136        // the created v8 object, eliminating the C++ callback
137        // when accessing the "data" property.
138        if (!pixelArray.IsEmpty())
139            wrapper->ForceSet(v8AtomicString(isolate, "data"), pixelArray, v8::ReadOnly);
140    }
141    return wrapper;
142}
143
144ImageData::ImageData(const IntSize& size)
145    : m_size(size)
146    , m_data(Uint8ClampedArray::create(size.width() * size.height() * 4))
147{
148}
149
150ImageData::ImageData(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
151    : m_size(size)
152    , m_data(byteArray)
153{
154    ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
155}
156
157} // namespace blink
158