text: /*
   * Copyright (C) 2008 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1.  Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   * 2.  Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
   *     its contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "core/html/ImageData.h"
  
  #include "bindings/core/v8/ExceptionState.h"
  #include "bindings/core/v8/V8Uint8ClampedArray.h"
  #include "core/dom/ExceptionCode.h"
  #include "platform/RuntimeEnabledFeatures.h"
  
  namespace blink {
  
  PassRefPtrWillBeRawPtr<ImageData> ImageData::create(const IntSize& size)
  {
      Checked<int, RecordOverflow> dataSize = 4;
      dataSize *= size.width();
      dataSize *= size.height();
      if (dataSize.hasOverflowed())
          return nullptr;
  
      return adoptRefWillBeNoop(new ImageData(size));
  }
  
  PassRefPtrWillBeRawPtr<ImageData> ImageData::create(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
  {
      Checked<int, RecordOverflow> dataSize = 4;
      dataSize *= size.width();
      dataSize *= size.height();
      if (dataSize.hasOverflowed())
          return nullptr;
  
      if (dataSize.unsafeGet() < 0
          || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
          return nullptr;
  
      return adoptRefWillBeNoop(new ImageData(size, DOMUint8ClampedArray::create(byteArray)));
  }
  
  PassRefPtrWillBeRawPtr<ImageData> ImageData::create(unsigned width, unsigned height, ExceptionState& exceptionState)
  {
      if (!RuntimeEnabledFeatures::imageDataConstructorEnabled()) {
          exceptionState.throwTypeError("Illegal constructor");
          return nullptr;
      }
      if (!width || !height) {
          exceptionState.throwDOMException(IndexSizeError, String::format("The source %s is zero or not a number.", width ? "height" : "width"));
          return nullptr;
      }
  
      Checked<unsigned, RecordOverflow> dataSize = 4;
      dataSize *= width;
      dataSize *= height;
      if (dataSize.hasOverflowed()) {
          exceptionState.throwDOMException(IndexSizeError, "The requested image size exceeds the supported range.");
          return nullptr;
      }
  
      RefPtrWillBeRawPtr<ImageData> imageData = adoptRefWillBeNoop(new ImageData(IntSize(width, height)));
      imageData->data()->zeroFill();
      return imageData.release();
  }
  
  PassRefPtrWillBeRawPtr<ImageData> ImageData::create(DOMUint8ClampedArray* data, unsigned width, unsigned height, ExceptionState& exceptionState)
  {
      if (!RuntimeEnabledFeatures::imageDataConstructorEnabled()) {
          exceptionState.throwTypeError("Illegal constructor");
          return nullptr;
      }
      if (!data) {
          exceptionState.throwTypeError("Expected a Uint8ClampedArray as first argument.");
          return nullptr;
      }
      if (!width) {
          exceptionState.throwDOMException(IndexSizeError, "The source width is zero or not a number.");
          return nullptr;
      }
  
      unsigned length = data->length();
      if (!length) {
          exceptionState.throwDOMException(IndexSizeError, "The input data has a zero byte length.");
          return nullptr;
      }
      if (length % 4) {
          exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of 4.");
          return nullptr;
      }
      length /= 4;
      if (length % width) {
          exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not a multiple of (4 * width).");
          return nullptr;
      }
      if (!height) {
          height = length / width;
      } else if (height != length / width) {
          exceptionState.throwDOMException(IndexSizeError, "The input data byte length is not equal to (4 * width * height).");
          return nullptr;
      }
  
      return adoptRefWillBeNoop(new ImageData(IntSize(width, height), data));
  }
  
  v8::Handle<v8::Object> ImageData::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperType, v8::Handle<v8::Object> wrapper)
  {
      ScriptWrappable::associateWithWrapper(isolate, wrapperType, wrapper);
  
      if (!wrapper.IsEmpty()) {
          // Create a V8 Uint8ClampedArray object.
          v8::Handle<v8::Value> pixelArray = toV8(m_data.get(), wrapper, isolate);
          // Set the "data" property of the ImageData object to
          // the created v8 object, eliminating the C++ callback
          // when accessing the "data" property.
          if (!pixelArray.IsEmpty())
              wrapper->ForceSet(v8AtomicString(isolate, "data"), pixelArray, v8::ReadOnly);
      }
      return wrapper;
  }
  
  ImageData::ImageData(const IntSize& size)
      : m_size(size)
      , m_data(DOMUint8ClampedArray::create(size.width() * size.height() * 4))
  {
  }
  
  ImageData::ImageData(const IntSize& size, PassRefPtr<DOMUint8ClampedArray> byteArray)
      : m_size(size)
      , m_data(byteArray)
  {
      ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
  }
  
  } // namespace blink
  