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() || dataSize.unsafeGet() < 0)
  45         return nullptr;
  46
  47     RefPtr<DOMUint8ClampedArray> byteArray =
  48         DOMUint8ClampedArray::createOrNull(dataSize.unsafeGet());
  49     if (!byteArray)
  50         return nullptr;
  51
  52     return new ImageData(size, byteArray.release());
  53 }
  54
  55 ImageData* ImageData::create(const IntSize& size, PassRefPtr<DOMUint8ClampedArray> byteArray)
  56 {
  57     Checked<int, RecordOverflow> dataSize = 4;
  58     dataSize *= size.width();
  59     dataSize *= size.height();
  60     if (dataSize.hasOverflowed())
  61         return nullptr;
  62
  63     if (dataSize.unsafeGet() < 0
  64         || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
  65         return nullptr;
  66
  67     return new ImageData(size, byteArray);
  68 }
  69
  70 ImageData* ImageData::create(unsigned width, unsigned height, ExceptionState& exceptionState)
  71 {
  72     if (!width || !height) {
  73         exceptionState.throwDOMException(IndexSizeError, String::format("The source %s is zero or not a number.", width ? "height" : "width"));
  74         return nullptr;
  75     }
  76
  77     Checked<unsigned, RecordOverflow> dataSize = 4;
  78     dataSize *= width;
  79     dataSize *= height;
  80     if (dataSize.hasOverflowed()
  81         || static_cast<int>(width) < 0
  82         || static_cast<int>(height) < 0) {
  83         exceptionState.throwDOMException(IndexSizeError, "The requested image size exceeds the supported range.");
  84         return nullptr;
  85     }
  86
  87     RefPtr<DOMUint8ClampedArray> byteArray =
  88         DOMUint8ClampedArray::createOrNull(dataSize.unsafeGet());
  89     if (!byteArray) {
  90         exceptionState.throwDOMException(V8GeneralError, "Out of memory at ImageData creation");
  91         return nullptr;
  92     }
  93
  94     return new ImageData(IntSize(width, height), byteArray.release());
  95 }
  96
  97 bool ImageData::validateConstructorArguments(DOMUint8ClampedArray* data, unsigned width, unsigned& lengthInPixels, ExceptionState& exceptionState)
  98 {
  99     if (!width) {
 100         exceptionState.throwDOMException(IndexSizeError, "The source width is zero or not a number.");
 101         return false;
 102     }
 103     ASSERT(data);
 104     unsigned length = data->length();
 105     if (!length) {
 106         exceptionState.throwDOMException(IndexSizeError, "The input data has a zero byte length.");
 107         return false;
 108     }
 109     if (length % 4) {
 110         exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of 4.");
 111         return false;
 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 false;
 117     }
 118     lengthInPixels = length;
 119     return true;
 120 }
 121
 122 ImageData* ImageData::create(DOMUint8ClampedArray* data, unsigned width, ExceptionState& exceptionState)
 123 {
 124     unsigned lengthInPixels = 0;
 125     if (!validateConstructorArguments(data, width, lengthInPixels, exceptionState)) {
 126         ASSERT(exceptionState.hadException());
 127         return nullptr;
 128     }
 129     ASSERT(lengthInPixels && width);
 130     unsigned height = lengthInPixels / width;
 131     return new ImageData(IntSize(width, height), data);
 132 }
 133
 134 ImageData* ImageData::create(DOMUint8ClampedArray* data, unsigned width, unsigned height, ExceptionState& exceptionState)
 135 {
 136     unsigned lengthInPixels = 0;
 137     if (!validateConstructorArguments(data, width, lengthInPixels, exceptionState)) {
 138         ASSERT(exceptionState.hadException());
 139         return nullptr;
 140     }
 141     ASSERT(lengthInPixels && width);
 142     if (height != lengthInPixels / width) {
 143         exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not equal to (4 * width * height).");
 144         return nullptr;
 145     }
 146     return new ImageData(IntSize(width, height), data);
 147 }
 148
 149 v8::Local<v8::Object> ImageData::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperType, v8::Local<v8::Object> wrapper)
 150 {
 151     wrapper = ScriptWrappable::associateWithWrapper(isolate, wrapperType, wrapper);
 152
 153     if (!wrapper.IsEmpty() && m_data.get()) {
 154         // Create a V8 Uint8ClampedArray object and set the "data" property
 155         // of the ImageData object to the created v8 object, eliminating the
 156         // C++ callback when accessing the "data" property.
 157         v8::Local<v8::Value> pixelArray = toV8(m_data.get(), wrapper, isolate);
 158         if (pixelArray.IsEmpty() || !v8CallBoolean(wrapper->DefineOwnProperty(isolate->GetCurrentContext(), v8AtomicString(isolate, "data"), pixelArray, v8::ReadOnly)))
 159             return v8::Local<v8::Object>();
 160     }
 161     return wrapper;
 162 }
 163
 164 ImageData::ImageData(const IntSize& size, PassRefPtr<DOMUint8ClampedArray> byteArray)
 165     : m_size(size)
 166     , m_data(byteArray)
 167 {
 168     ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
 169 }
 170
 171 void ImageData::dispose()
 172 {
 173     m_data.clear();
 174 }
 175
 176 } // namespace blink