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/*
* Copyright (C) 2024 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 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 "ImageDataArray.h"
#include <JavaScriptCore/Float16Array.h>
#include <JavaScriptCore/GenericTypedArrayViewInlines.h>
#include <JavaScriptCore/Uint8ClampedArray.h>
#include <wtf/StdLibExtras.h>
// Needed for `downcast` below.
SPECIALIZE_TYPE_TRAITS_BEGIN(JSC::Uint8ClampedArray)
static bool isType(const JSC::ArrayBufferView& arrayBufferView) { return arrayBufferView.getType() == JSC::TypeUint8Clamped; }
SPECIALIZE_TYPE_TRAITS_END()
SPECIALIZE_TYPE_TRAITS_BEGIN(JSC::Float16Array)
static bool isType(const JSC::ArrayBufferView& arrayBufferView) { return arrayBufferView.getType() == JSC::TypeFloat16; }
SPECIALIZE_TYPE_TRAITS_END()
namespace WebCore {
template <typename F>
static auto visitArrayBufferView(JSC::ArrayBufferView& bufferView, F&& f)
{
// Always try Uint8ClampedArray first, as it should be the most frequent.
if (auto* array = dynamicDowncast<JSC::Uint8ClampedArray>(bufferView))
return std::forward<F>(f)(*array);
if (auto* array = dynamicDowncast<JSC::Float16Array>(bufferView))
return std::forward<F>(f)(*array);
RELEASE_ASSERT_NOT_REACHED("Unexpected ArrayBufferView type");
}
ImageDataArray::ImageDataArray(Ref<JSC::ArrayBufferView>&& arrayBufferView)
: m_arrayBufferView(WTFMove(arrayBufferView))
{
ASSERT(isSupported(m_arrayBufferView.get()));
}
ImageDataArray::ImageDataArray(Ref<JSC::Uint8ClampedArray>&& data)
: ImageDataArray(Ref<JSC::ArrayBufferView>(WTFMove(data)))
{ }
ImageDataArray::ImageDataArray(Ref<JSC::Float16Array>&& data)
: ImageDataArray(Ref<JSC::ArrayBufferView>(WTFMove(data)))
{ }
ImageDataArray::ImageDataArray(ImageDataArray&& original, std::optional<ImageDataStorageFormat> overridingStorageFormat)
: m_arrayBufferView(WTFMove(original).extractBufferViewWithStorageFormat(overridingStorageFormat))
{ }
template <typename TypedArray>
static void fillTypedArray(TypedArray& typedArray, std::span<const uint8_t> optionalBytes)
{
if (optionalBytes.empty())
return typedArray.zeroFill();
auto bufferViewSpan = typedArray.mutableSpan();
RELEASE_ASSERT(bufferViewSpan.size_bytes() == optionalBytes.size_bytes(), "Caller should provide correctly-sized buffer to copy");
memcpySpan(bufferViewSpan, optionalBytes);
}
std::optional<ImageDataArray> ImageDataArray::tryCreate(size_t length, ImageDataStorageFormat storageFormat, std::span<const uint8_t> optionalBytes)
{
std::optional<ImageDataArray> array;
switch (storageFormat) {
case ImageDataStorageFormat::Uint8:
if (RefPtr typedArray = JSC::Uint8ClampedArray::tryCreateUninitialized(length)) {
fillTypedArray(*typedArray, optionalBytes);
array.emplace(typedArray.releaseNonNull());
}
break;
case ImageDataStorageFormat::Float16:
if (RefPtr typedArray = JSC::Float16Array::tryCreateUninitialized(length)) {
fillTypedArray(*typedArray, optionalBytes);
array.emplace(typedArray.releaseNonNull());
}
}
return array;
}
bool ImageDataArray::isSupported(const JSC::ArrayBufferView& arrayBufferView)
{
return isSupported(arrayBufferView.getType());
}
ImageDataStorageFormat ImageDataArray::storageFormat() const
{
auto imageDataStorageFormat = toImageDataStorageFormat(m_arrayBufferView->getType());
RELEASE_ASSERT(!!imageDataStorageFormat);
return *imageDataStorageFormat;
}
template <typename From, typename To>
struct TypedArrayItemConverter;
template <>
struct TypedArrayItemConverter<JSC::Uint8ClampedArray, JSC::Float16Array> {
static constexpr JSC::Float16Adaptor::Type convert(JSC::Uint8ClampedAdaptor::Type value)
{
return double(value) / 255.0;
}
};
template <>
struct TypedArrayItemConverter<JSC::Float16Array, JSC::Uint8ClampedArray> {
static constexpr JSC::Uint8ClampedAdaptor::Type convert(JSC::Float16Adaptor::Type value)
{
auto d = double(value);
if (d <= 0)
return 0;
if (d >= 1)
return 255;
return d * 255.0 + 0.5;
}
};
template <typename ToTypeArray>
static Ref<ToTypeArray> convertToTypedArray(const ImageDataArray& fromImageDataArray)
{
Ref arrayBufferView = fromImageDataArray.arrayBufferView();
return visitArrayBufferView(arrayBufferView, []<typename FromTypedArray>(FromTypedArray& fromTypedArray) {
if constexpr (std::is_same_v<FromTypedArray, ToTypeArray>)
return Ref(fromTypedArray);
else {
using Converter = TypedArrayItemConverter<FromTypedArray, ToTypeArray>;
auto length = fromTypedArray.length();
Ref<ToTypeArray> toArray = ToTypeArray::create(length);
for (size_t i = 0; i < length; ++i)
toArray->set(i, Converter::convert(fromTypedArray.item(i)));
return toArray;
}
});
}
Ref<JSC::Uint8ClampedArray> ImageDataArray::asUint8ClampedArray() const
{
return convertToTypedArray<JSC::Uint8ClampedArray>(*this);
}
Ref<JSC::Float16Array> ImageDataArray::asFloat16Array() const
{
return convertToTypedArray<JSC::Float16Array>(*this);
}
size_t ImageDataArray::length() const
{
return visitArrayBufferView(
m_arrayBufferView.get(),
[](const auto& array) {
return array.length();
});
}
Ref<JSON::Value> ImageDataArray::copyToJSONArray() const
{
return visitArrayBufferView(m_arrayBufferView.get(), []<typename T>(const T& array) -> Ref<JSON::Value> {
static_assert(std::is_same_v<T, JSC::Uint8ClampedArray> || std::is_same_v<T, JSC::Float16Array>);
using CType = std::conditional_t<std::is_same_v<T, JSC::Uint8ClampedArray>, int, double>;
Ref jsArray = JSON::ArrayOf<CType>::create();
for (const auto& item : array.typedSpan())
jsArray->addItem(CType(item));
return jsArray;
});
}
Ref<ArrayBufferView> ImageDataArray::extractBufferViewWithStorageFormat(std::optional<ImageDataStorageFormat> overridingStorageFormat) &&
{
if (!overridingStorageFormat)
return WTFMove(m_arrayBufferView);
switch (*overridingStorageFormat) {
case ImageDataStorageFormat::Uint8: return asUint8ClampedArray();
case ImageDataStorageFormat::Float16: return asFloat16Array();
}
RELEASE_ASSERT_NOT_REACHED("Unexpected ImageDataStorageFormat value");
}
ImageDataArray::operator Variant() const
{
return visitArrayBufferView(m_arrayBufferView.get(), [](auto& a) {
return Variant(RefPtr(&a));
});
}
} // namespace WebCore
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