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/*
* Copyright (C) 2021-2022 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
* 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.
*
* 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
* 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.
*/
#pragma once
#include <WebCore/IntSize.h>
#include <WebCore/PixelBufferFormat.h>
#include <optional>
#include <span>
#include <wtf/RefCounted.h>
namespace WTF {
class TextStream;
}
namespace WebCore {
// Type for holding pixel buffers data.
// For functions that source pixel buffers, see PixelBufferSourceView.
class PixelBuffer : public RefCounted<PixelBuffer> {
WTF_MAKE_NONCOPYABLE(PixelBuffer);
public:
static constexpr uint32_t bytesPerPixelComponent(PixelFormat);
static constexpr uint32_t componentsPerPixel(PixelFormat);
static constexpr uint32_t bytesPerPixel(PixelFormat);
static CheckedUint32 computePixelCount(const IntSize&);
static CheckedUint32 computePixelComponentCount(PixelFormat, const IntSize&);
WEBCORE_EXPORT static CheckedUint32 computeBufferSize(PixelFormat, const IntSize&);
WEBCORE_EXPORT static bool supportedPixelFormat(PixelFormat);
WEBCORE_EXPORT virtual ~PixelBuffer();
const PixelBufferFormat& format() const { return m_format; }
const IntSize& size() const { return m_size; }
std::span<uint8_t> bytes() const { return m_bytes; }
enum class Type {
ByteArray,
#if ENABLE(PIXEL_FORMAT_RGBA16F)
Float16Array,
#endif
Other
};
virtual Type type() const { return Type::Other; }
virtual RefPtr<PixelBuffer> createScratchPixelBuffer(const IntSize&) const = 0;
bool setRange(std::span<const uint8_t> data, size_t byteOffset);
WEBCORE_EXPORT bool zeroRange(size_t byteOffset, size_t rangeByteLength);
void zeroFill() { zeroRange(0, bytes().size()); }
WEBCORE_EXPORT uint8_t item(size_t index) const;
void set(size_t index, double value);
protected:
WEBCORE_EXPORT PixelBuffer(const PixelBufferFormat&, const IntSize&, std::span<uint8_t> bytes);
PixelBufferFormat m_format;
IntSize m_size;
std::span<uint8_t> m_bytes;
};
// Type to use for functions that use the PixelBuffer data as source during the call, but do not store a reference to the object or modify the data.
class PixelBufferSourceView {
public:
PixelBufferSourceView() = delete;
PixelBufferSourceView(const PixelBuffer& pixelBuffer)
: PixelBufferSourceView(pixelBuffer.format(), pixelBuffer.size(), pixelBuffer.bytes())
{
}
static std::optional<PixelBufferSourceView> create(const PixelBufferFormat& format, const IntSize& size, std::span<const uint8_t> bytes)
{
if (!PixelBuffer::supportedPixelFormat(format.pixelFormat))
return std::nullopt;
auto bufferSize = PixelBuffer::computeBufferSize(format.pixelFormat, size);
if (bufferSize.hasOverflowed() || bytes.size() != bufferSize)
return std::nullopt;
return PixelBufferSourceView(format, size, bytes);
}
const PixelBufferFormat& format() const { return m_format; }
IntSize size() const { return m_size; }
std::span<const uint8_t> bytes() const LIFETIME_BOUND { return m_bytes; }
private:
PixelBufferSourceView(const PixelBufferFormat& format, const IntSize& size, std::span<const uint8_t> bytes)
: m_format(format)
, m_size(size)
, m_bytes(bytes)
{
}
PixelBufferFormat m_format;
IntSize m_size;
std::span<const uint8_t> m_bytes;
};
constexpr uint32_t PixelBuffer::bytesPerPixelComponent(PixelFormat pixelFormat)
{
#if ENABLE(PIXEL_FORMAT_RGBA16F)
return (pixelFormat == PixelFormat::RGBA16F) ? 2 : 1;
#else
UNUSED_PARAM(pixelFormat);
return 1;
#endif
}
constexpr uint32_t PixelBuffer::componentsPerPixel(PixelFormat)
{
return 4;
}
constexpr uint32_t PixelBuffer::bytesPerPixel(PixelFormat pixelFormat)
{
return bytesPerPixelComponent(pixelFormat) * componentsPerPixel(pixelFormat);
}
} // namespace WebCore
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