Source/WebCore/html/ImageData.cpp

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

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

namespace WebCore {

static CheckedUint32 computeDataSize(const IntSize& size)
{
    CheckedUint32 checkedDataSize = 4;
    checkedDataSize *= static_cast<unsigned>(size.width());
    checkedDataSize *= static_cast<unsigned>(size.height());
    return checkedDataSize;
}

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

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

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

RefPtr<ImageData> ImageData::create(const IntSize& size)
{
    auto dataSize = computeDataSize(size);
    if (dataSize.hasOverflowed())
        return nullptr;
    auto byteArray = Uint8ClampedArray::tryCreateUninitialized(dataSize);
    if (!byteArray)
        return nullptr;
    return adoptRef(*new ImageData(size, byteArray.releaseNonNull(), PredefinedColorSpace::SRGB));
}

RefPtr<ImageData> ImageData::create(const IntSize& size, Ref<Uint8ClampedArray>&& byteArray, PredefinedColorSpace colorSpace)
{
    auto dataSize = computeDataSize(size);
    if (dataSize.hasOverflowed() || dataSize != byteArray->length())
        return nullptr;

    return adoptRef(*new ImageData(size, WTFMove(byteArray), colorSpace));
}

ExceptionOr<Ref<ImageData>> ImageData::createUninitialized(unsigned rows, unsigned pixelsPerRow, PredefinedColorSpace defaultColorSpace, std::optional<ImageDataSettings> settings)
{
    IntSize size(rows, pixelsPerRow);
    auto dataSize = computeDataSize(size);
    if (dataSize.hasOverflowed())
        return Exception { RangeError, "Cannot allocate a buffer of this size"_s };

    auto byteArray = Uint8ClampedArray::tryCreateUninitialized(dataSize);
    if (!byteArray) {
        // FIXME: Does this need to be a "real" out of memory error with setOutOfMemoryError called on it?
        return Exception { RangeError, "Out of memory"_s };
    }

    auto colorSpace = computeColorSpace(settings, defaultColorSpace);
    return adoptRef(*new ImageData(size, byteArray.releaseNonNull(), colorSpace));
}

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

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

    auto byteArray = Uint8ClampedArray::tryCreateUninitialized(dataSize);
    if (!byteArray) {
        // FIXME: Does this need to be a "real" out of memory error with setOutOfMemoryError called on it?
        return Exception { RangeError, "Out of memory"_s };
    }
    byteArray->zeroFill();

    auto colorSpace = computeColorSpace(settings);
    return adoptRef(*new ImageData(size, byteArray.releaseNonNull(), colorSpace));
}

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

    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 };

    IntSize size(sw, height);
    auto dataSize = computeDataSize(size);
    if (dataSize.hasOverflowed() || dataSize != byteArray->length())
        return Exception { RangeError };

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

ImageData::ImageData(const IntSize& size, Ref<JSC::Uint8ClampedArray>&& data, PredefinedColorSpace colorSpace)
    : m_size(size)
    , m_data(WTFMove(data))
    , m_colorSpace(colorSpace)
{
}

ImageData::~ImageData() = default;

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

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

}