Source/WebCore/platform/graphics/ByteArrayPixelBuffer.cpp

/*
 * Copyright (C) 2022 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
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "config.h"
#include "ByteArrayPixelBuffer.h"

#include <JavaScriptCore/TypedArrayInlines.h>

namespace WebCore {

Ref<ByteArrayPixelBuffer> ByteArrayPixelBuffer::create(const PixelBufferFormat& format, const IntSize& size, JSC::Uint8ClampedArray& data)
{
    return adoptRef(*new ByteArrayPixelBuffer(format, size, { data }));
}

RefPtr<ByteArrayPixelBuffer> ByteArrayPixelBuffer::tryCreate(const PixelBufferFormat& format, const IntSize& size)
{
    ASSERT(supportedPixelFormat(format.pixelFormat));

    auto bufferSize = computeBufferSize(format, size);
    if (bufferSize.hasOverflowed())
        return nullptr;
    if (bufferSize > std::numeric_limits<int32_t>::max())
        return nullptr;

    auto data = Uint8ClampedArray::tryCreateUninitialized(bufferSize);
    if (!data)
        return nullptr;

    return create(format, size, data.releaseNonNull());
}

RefPtr<ByteArrayPixelBuffer> ByteArrayPixelBuffer::tryCreate(const PixelBufferFormat& format, const IntSize& size, Ref<JSC::ArrayBuffer>&& arrayBuffer)
{
    ASSERT(supportedPixelFormat(format.pixelFormat));

    auto bufferSize = computeBufferSize(format, size);
    if (bufferSize.hasOverflowed())
        return nullptr;
    if (bufferSize != arrayBuffer->byteLength())
        return nullptr;

    auto data = Uint8ClampedArray::tryCreate(WTFMove(arrayBuffer), 0, bufferSize);
    if (!data)
        return nullptr;

    return create(format, size, data.releaseNonNull());
}

RefPtr<ByteArrayPixelBuffer> ByteArrayPixelBuffer::tryCreate(const PixelBufferFormat& format, const IntSize& size, unsigned dataByteLength)
{
    ASSERT(supportedPixelFormat(format.pixelFormat));
    ASSERT(computeBufferSize(format, size) == dataByteLength);

    auto data = Uint8ClampedArray::tryCreateUninitialized(dataByteLength);
    if (!data)
        return nullptr;

    return create(format, size, data.releaseNonNull());
}

ByteArrayPixelBuffer::ByteArrayPixelBuffer(const PixelBufferFormat& format, const IntSize& size, Ref<JSC::Uint8ClampedArray>&& data)
    : PixelBuffer(format, size, data->data(), data->byteLength())
    , m_data(WTFMove(data))
{
}

RefPtr<PixelBuffer> ByteArrayPixelBuffer::createScratchPixelBuffer(const IntSize& size) const
{
    return ByteArrayPixelBuffer::tryCreate(m_format, size);
}

} // namespace WebCore