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#include <qtest.h>

#include <QImage>

Q_DECLARE_METATYPE(QImage)

class tst_QImageConversion : public QObject

{

    Q_OBJECT

private slots:

    void convertRgb888ToRGB32_data();

    void convertRgb888ToRGB32();

private:

    QImage generateImageRgb888(int width, int height);

};

void tst_QImageConversion::convertRgb888ToRGB32_data()

{

    QTest::addColumn<QImage>("inputImage");

    // height = 5000 to get interesting timing.

    // 3 pixels wide -> smaller than regular vector of 128bits

    QTest::newRow("width: 3px; height: 5000px;") << generateImageRgb888(3, 5000);

    // 8 pixels wide -> potential for 2 vectors

    QTest::newRow("width: 8px; height: 5000px;") << generateImageRgb888(3, 5000);

    // 16 pixels, minimum for the SSSE3 implementation

    QTest::newRow("width: 16px; height: 5000px;") << generateImageRgb888(16, 5000);

    // 50 pixels, more realistic use case

    QTest::newRow("width: 50px; height: 5000px;") << generateImageRgb888(50, 5000);

    // 2000 pixels -> typical values for pictures

    QTest::newRow("width: 2000px; height: 5000px;") << generateImageRgb888(2000, 5000);

}

void tst_QImageConversion::convertRgb888ToRGB32()

{

    QFETCH(QImage, inputImage);

    QBENCHMARK {

        volatile QImage output = inputImage.convertToFormat(QImage::Format_RGB32);

        // we need the volatile and the following to make sure the compiler does not do

        // anything stupid :)

        (void)output;

    }

}

/*

 Fill a RGB888 image with "random" pixel values.

 */

QImage tst_QImageConversion::generateImageRgb888(int width, int height)

{

    QImage image(width, height, QImage::Format_RGB888);

    const int byteWidth = width * 3;

    for (int y = 0; y < image.height(); ++y) {

        uchar *scanline = image.scanLine(y);

        for (int x = 0; x < byteWidth; ++x)

            scanline[x] = x ^ y;

    }

    return image;

}

QTEST_MAIN(tst_QImageConversion)

#include "tst_qimageconversion.moc"