Source/WebCore/html/ImageData.cpp

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#include "config.h"
#include "ImageData.h"

#include "ExceptionOr.h"
#include <JavaScriptCore/GenericTypedArrayViewInlines.h>
#include <JavaScriptCore/JSCInlines.h>
#include <wtf/text/TextStream.h>

namespace WebCore {

static CheckedUint32 computeDataSize(const IntSize& size, ImageDataStorageFormat storageFormat)
{
    return PixelBuffer::computePixelComponentCount(toPixelFormat(storageFormat), size);
}

PredefinedColorSpace ImageData::computeColorSpace(std::optional<ImageDataSettings> settings, PredefinedColorSpace defaultColorSpace)
{
    if (settings && settings->colorSpace)
        return *settings->colorSpace;
    return defaultColorSpace;
}

static ImageDataStorageFormat computeStorageFormat(std::optional<ImageDataSettings> settings, ImageDataStorageFormat defaultStorageFormat = ImageDataStorageFormat::Uint8)
{
    return settings ? settings->storageFormat : defaultStorageFormat;
}

Ref<ImageData> ImageData::create(Ref<ByteArrayPixelBuffer>&& pixelBuffer, std::optional<ImageDataStorageFormat> overridingStorageFormat)
{
    auto colorSpace = toPredefinedColorSpace(pixelBuffer->format().colorSpace);
    return adoptRef(*new ImageData(pixelBuffer->size(), pixelBuffer->takeData(), *colorSpace, overridingStorageFormat));
}

RefPtr<ImageData> ImageData::create(RefPtr<ByteArrayPixelBuffer>&& pixelBuffer, std::optional<ImageDataStorageFormat> overridingStorageFormat)
{
    if (!pixelBuffer)
        return nullptr;
    return create(pixelBuffer.releaseNonNull(), overridingStorageFormat);
}

RefPtr<ImageData> ImageData::create(const IntSize& size, PredefinedColorSpace colorSpace, ImageDataStorageFormat imageDataStorageFormat)
{
    auto dataSize = computeDataSize(size, ImageDataStorageFormat::Uint8);
    if (dataSize.hasOverflowed())
        return nullptr;
    auto array = ImageDataArray::tryCreate(dataSize, ImageDataStorageFormat::Uint8);
    if (!array)
        return nullptr;
    return adoptRef(*new ImageData(size, WTFMove(*array), colorSpace, imageDataStorageFormat));
}

RefPtr<ImageData> ImageData::create(const IntSize& size, ImageDataArray&& array, PredefinedColorSpace colorSpace)
{
    auto dataSize = computeDataSize(size, array.storageFormat());
    if (dataSize.hasOverflowed() || dataSize != array.length())
        return nullptr;
    return adoptRef(*new ImageData(size, WTFMove(array), colorSpace));
}


ExceptionOr<Ref<ImageData>> ImageData::create(unsigned sw, unsigned sh, PredefinedColorSpace defaultColorSpace, std::optional<ImageDataSettings> settings, std::span<const uint8_t> optionalBytes)
{
    if (!sw || !sh)
        return Exception { ExceptionCode::IndexSizeError };

    IntSize size(sw, sh);
    auto storageFormat = computeStorageFormat(settings);
    auto dataSize = computeDataSize(size, storageFormat);
    if (dataSize.hasOverflowed())
        return Exception { ExceptionCode::RangeError, "Cannot allocate a buffer of this size"_s };

    auto array = ImageDataArray::tryCreate(dataSize, storageFormat, optionalBytes);
    if (!array) {
        // FIXME: Does this need to be a "real" out of memory error with setOutOfMemoryError called on it?
        return Exception { ExceptionCode::RangeError, "Out of memory"_s };
    }

    auto colorSpace = ImageData::computeColorSpace(settings, defaultColorSpace);
    return adoptRef(*new ImageData(size, WTFMove(*array), colorSpace));
}

ExceptionOr<Ref<ImageData>> ImageData::create(unsigned sw, unsigned sh, std::optional<ImageDataSettings> settings)
{
    return create(sw, sh, PredefinedColorSpace::SRGB, settings);
}

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

    auto pixels = length / 4;
    if (!sw || pixels % sw)
        return Exception { ExceptionCode::IndexSizeError, "Length is not a multiple of sw"_s };

    Checked<int, RecordOverflow> height = pixels / sw;
    if (height.hasOverflowed())
        return Exception { ExceptionCode::IndexSizeError, "Computed height is too big"_s };

    if (sh && sh.value() != height)
        return Exception { ExceptionCode::IndexSizeError, "sh value is not equal to height"_s };

    IntSize size(sw, height.value());
    auto dataSize = computeDataSize(size, computeStorageFormat(settings));
    if (dataSize.hasOverflowed() || dataSize != length)
        return Exception { ExceptionCode::RangeError };

    auto colorSpace = computeColorSpace(settings);
    return adoptRef(*new ImageData(size, WTFMove(array), colorSpace));
}

ImageData::ImageData(const IntSize& size, ImageDataArray&& data, PredefinedColorSpace colorSpace)
    : m_size(size)
    , m_data(WTFMove(data))
    , m_colorSpace(colorSpace)
{
}

ImageData::ImageData(const IntSize& size, ImageDataArray&& data, PredefinedColorSpace colorSpace, std::optional<ImageDataStorageFormat> overridingStorageFormat)
    : m_size(size)
    , m_data(WTFMove(data), overridingStorageFormat)
    , m_colorSpace(colorSpace)
{
}

ImageData::~ImageData() = default;

Ref<ByteArrayPixelBuffer> ImageData::byteArrayPixelBuffer() const
{
    Ref uint8Data = m_data.asUint8ClampedArray();
    PixelBufferFormat format { AlphaPremultiplication::Unpremultiplied, PixelFormat::RGBA8, toDestinationColorSpace(m_colorSpace) };
    return ByteArrayPixelBuffer::create(format, m_size, uint8Data.get());
}

TextStream& operator<<(TextStream& ts, const ImageData& imageData)
{
    // Print out the address of the pixel data array
    return ts << &imageData.data();
}

}