ImageData.cpp   [plain text]

/*
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 * Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
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 *     notice, this list of conditions and the following disclaimer.
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
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#include "config.h"
#include "ImageData.h"

#include "ExceptionCode.h"
#include <runtime/JSCInlines.h>
#include <runtime/TypedArrayInlines.h>

namespace WebCore {

RefPtr<ImageData> ImageData::create(unsigned sw, unsigned sh, ExceptionCode& ec)
{
    if (!sw || !sh) {
        ec = INDEX_SIZE_ERR;
        return nullptr;
    }

    Checked<int, RecordOverflow> dataSize = 4;
    dataSize *= sw;
    dataSize *= sh;
    if (dataSize.hasOverflowed()) {
        ec = TypeError;
        return nullptr;
    }

    IntSize size(sw, sh);
    auto data = adoptRef(*new ImageData(size));
    data->data()->zeroFill();
    return WTFMove(data);
}

RefPtr<ImageData> ImageData::create(const IntSize& size)
{
    Checked<int, RecordOverflow> dataSize = 4;
    dataSize *= size.width();
    dataSize *= size.height();
    if (dataSize.hasOverflowed())
        return nullptr;

    return adoptRef(*new ImageData(size));
}

RefPtr<ImageData> ImageData::create(const IntSize& size, Ref<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 adoptRef(*new ImageData(size, WTFMove(byteArray)));
}

RefPtr<ImageData> ImageData::create(Ref<Uint8ClampedArray>&& byteArray, unsigned sw, unsigned sh, ExceptionCode& ec)
{
    unsigned length = byteArray->length();
    if (!length || length % 4 != 0) {
        ec = INVALID_STATE_ERR;
        return nullptr;
    }

    if (!sw) {
        ec = INDEX_SIZE_ERR;
        return nullptr;
    }

    length /= 4;
    if (length % sw != 0) {
        ec = INVALID_STATE_ERR;
        return nullptr;
    }

    unsigned height = length / sw;
    if (sh && sh != height) {
        ec = INDEX_SIZE_ERR;
        return nullptr;
    }

    return create(IntSize(sw, height), WTFMove(byteArray));
}

ImageData::ImageData(const IntSize& size)
    : m_size(size)
    , m_data(Uint8ClampedArray::createUninitialized((size.area() * 4).unsafeGet()))
{
    ASSERT(m_data);
}

ImageData::ImageData(const IntSize& size, Ref<Uint8ClampedArray>&& byteArray)
    : m_size(size)
    , m_data(WTFMove(byteArray))
{
    ASSERT(m_data);
    ASSERT_WITH_SECURITY_IMPLICATION(!m_data || (size.area() * 4).unsafeGet() <= m_data->length());
}

}