ImageData.cpp   [plain text]

/*
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 * Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
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#include "config.h"
#include "ImageData.h"

#include <JavaScriptCore/JSCInlines.h>
#include <JavaScriptCore/TypedArrayInlines.h>

namespace WebCore {

ExceptionOr<Ref<ImageData>> ImageData::create(unsigned sw, unsigned sh)
{
    if (!sw || !sh)
        return Exception { IndexSizeError };

    Checked<int, RecordOverflow> dataSize = 4;
    dataSize *= sw;
    dataSize *= sh;
    if (dataSize.hasOverflowed())
        return Exception { RangeError, "Cannot allocate a buffer of this size"_s };

    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)));
}

ExceptionOr<RefPtr<ImageData>> ImageData::create(Ref<Uint8ClampedArray>&& byteArray, unsigned sw, std::optional<unsigned> sh)
{
    unsigned length = byteArray->length();
    if (!length || length % 4)
        return Exception { InvalidStateError, "Length is not a non-zero multiple of 4"_s };

    ASSERT(length > 0);
    length /= 4;
    if (!sw || length % sw)
        return Exception { IndexSizeError, "Length is not a multiple of sw"_s };

    unsigned height = length / sw;
    if (sh && sh.value() != height)
        return Exception { IndexSizeError, "sh value is not equal to height"_s };

    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());
}

}