third_party/WebKit/Source/core/html/ImageData.cpp

   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/V8Uint8ClampedArray.h"
  34 #include "core/dom/ExceptionCode.h"
  35 #include "platform/RuntimeEnabledFeatures.h"
  36
  37 namespace blink {
  38
  39 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 new ImageData(size);
  48 }
  49
  50 ImageData* ImageData::create(const IntSize& size, PassRefPtr<DOMUint8ClampedArray> 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 new ImageData(size, byteArray);
  63 }
  64
  65 ImageData* ImageData::create(unsigned width, unsigned height, ExceptionState& exceptionState)
  66 {
  67     if (!width || !height) {
  68         exceptionState.throwDOMException(IndexSizeError, String::format("The source %s is zero or not a number.", width ? "height" : "width"));
  69         return nullptr;
  70     }
  71
  72     Checked<unsigned, RecordOverflow> dataSize = 4;
  73     dataSize *= width;
  74     dataSize *= height;
  75     if (dataSize.hasOverflowed()) {
  76         exceptionState.throwDOMException(IndexSizeError, "The requested image size exceeds the supported range.");
  77         return nullptr;
  78     }
  79
  80     return new ImageData(IntSize(width, height));
  81 }
  82
  83 bool ImageData::validateConstructorArguments(DOMUint8ClampedArray* data, unsigned width, unsigned& lengthInPixels, ExceptionState& exceptionState)
  84 {
  85     if (!width) {
  86         exceptionState.throwDOMException(IndexSizeError, "The source width is zero or not a number.");
  87         return false;
  88     }
  89     ASSERT(data);
  90     unsigned length = data->length();
  91     if (!length) {
  92         exceptionState.throwDOMException(IndexSizeError, "The input data has a zero byte length.");
  93         return false;
  94     }
  95     if (length % 4) {
  96         exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of 4.");
  97         return false;
  98     }
  99     length /= 4;
 100     if (length % width) {
 101         exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of (4 * width).");
 102         return false;
 103     }
 104     lengthInPixels = length;
 105     return true;
 106 }
 107
 108 ImageData* ImageData::create(DOMUint8ClampedArray* data, unsigned width, ExceptionState& exceptionState)
 109 {
 110     unsigned lengthInPixels = 0;
 111     if (!validateConstructorArguments(data, width, lengthInPixels, exceptionState)) {
 112         ASSERT(exceptionState.hadException());
 113         return nullptr;
 114     }
 115     ASSERT(lengthInPixels && width);
 116     unsigned height = lengthInPixels / width;
 117     return new ImageData(IntSize(width, height), data);
 118 }
 119
 120 ImageData* ImageData::create(DOMUint8ClampedArray* data, unsigned width, unsigned height, ExceptionState& exceptionState)
 121 {
 122     unsigned lengthInPixels = 0;
 123     if (!validateConstructorArguments(data, width, lengthInPixels, exceptionState)) {
 124         ASSERT(exceptionState.hadException());
 125         return nullptr;
 126     }
 127     ASSERT(lengthInPixels && width);
 128     if (height != lengthInPixels / width) {
 129         exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not equal to (4 * width * height).");
 130         return nullptr;
 131     }
 132     return new ImageData(IntSize(width, height), data);
 133 }
 134
 135 v8::Local<v8::Object> ImageData::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperType, v8::Local<v8::Object> wrapper)
 136 {
 137     wrapper = ScriptWrappable::associateWithWrapper(isolate, wrapperType, wrapper);
 138
 139     if (!wrapper.IsEmpty() && m_data.get()) {
 140         // Create a V8 Uint8ClampedArray object and set the "data" property
 141         // of the ImageData object to the created v8 object, eliminating the
 142         // C++ callback when accessing the "data" property.
 143         v8::Local<v8::Value> pixelArray = toV8(m_data.get(), wrapper, isolate);
 144         if (pixelArray.IsEmpty() || !v8CallBoolean(wrapper->DefineOwnProperty(isolate->GetCurrentContext(), v8AtomicString(isolate, "data"), pixelArray, v8::ReadOnly)))
 145             return v8::Local<v8::Object>();
 146     }
 147     return wrapper;
 148 }
 149
 150 ImageData::ImageData(const IntSize& size)
 151     : m_size(size)
 152     , m_data(DOMUint8ClampedArray::create(size.width() * size.height() * 4))
 153 {
 154 }
 155
 156 ImageData::ImageData(const IntSize& size, PassRefPtr<DOMUint8ClampedArray> byteArray)
 157     : m_size(size)
 158     , m_data(byteArray)
 159 {
 160     ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
 161 }
 162
 163 void ImageData::dispose()
 164 {
 165     m_data.clear();
 166 }
 167
 168 } // namespace blink