flutter_flutter/engine/core/html/ImageData.cpp

/*
 * 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/custom/V8Uint8ClampedArrayCustom.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, 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(Uint8ClampedArray* 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::wrap(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
{
    v8::Handle<v8::Object> wrapper = ScriptWrappable::wrap(creationContext, isolate);
    if (!wrapper.IsEmpty()) {
        // Create a V8 Uint8ClampedArray object.
        v8::Handle<v8::Value> pixelArray = toV8(data(), creationContext, 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(Uint8ClampedArray::create(size.width() * size.height() * 4))
{
    ScriptWrappable::init(this);
}

ImageData::ImageData(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
    : m_size(size)
    , m_data(byteArray)
{
    ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
    ScriptWrappable::init(this);
}

}