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<?php

/**
 *
 * Gets the installed version of ImageMagick and compares the
 * appropriate version to the installed version. *
 *
 * @param $testIm6Version
 * @param $im7Version
 * @return int
 */
function version_compare_imagemagick($testIm6Version, $im7Version)
{
    $versionInfo = \Imagick::getVersion();

if (array_key_exists("versionString", $versionInfo) == false) {
        die("skip unable to determine ImageMagick version.");
    }

$versionInstalledStringComplete = $versionInfo["versionString"];

$firstSpace = strpos($versionInstalledStringComplete, ' ');
    if ($firstSpace === false) {
        die("Failed to understand version string [$versionInstalledStringComplete] - finding first space");
    }

$secondSpace = strpos($versionInstalledStringComplete, ' ', $firstSpace + 1);
    if ($secondSpace === false) {
        die("Failed to understand version string [$versionInstalledStringComplete] - finding second space");
    }

$versionInstalledString = substr($versionInstalledStringComplete, $firstSpace + 1, $secondSpace - $firstSpace - 1);
    // echo "versionInstalledString is $versionInstalledString \n";

$versionToCompare = $im7Version;
    if (substr($versionInstalledString, 0, 1) === '6') {
        $versionToCompare = $testIm6Version;
    }

return version_compare($versionInstalledString, $versionToCompare);
}

/**
 *
 * Compares the installed version of ImageMagick and returns true if the appropriate
 * version is greater
 *
 * @param $testIm6Version
 * @param $im7Version
 * @return bool
 */
function isVersionGreaterEqual($testIm6Version, $im7Version)
{
    $versionCompare = version_compare_imagemagick($testIm6Version, $im7Version);
    // echo "version compare for $testIm6Version, $im7Version is $versionCompare \n";

if ($versionCompare >= 0) {
        return true;
    }

return false;
}

/**
 * On some systems, where the standard fonts aren't available, trying
 * to draw any text fails as the ImageMagick default font is null.
 *
 * This function just find a 'sensible' font to use, either from the
 * preferred list, or just the first one from queryFonts(). That 'probably'
 * is the right thing to do, as it makes the tests more stable.
 */
function findDefaultFont()
{
    $knownFonts = [
        'Courier',
        'Helvetica',
        'Times-Roman',
        'Liberation-Mono',
        'Utopia',
    ];

$fontList = \Imagick::queryFonts();

foreach ($knownFonts as $knownFont) {

if (in_array($knownFont, $fontList, true) === true) {
            return $knownFont;
        }
    }

if (count($fontList) !== 0) {
        return $fontList[0];
    }

throw new \Exception("No fonts available on system, apparently.");
}

// Find and set a font for the Imagick object
function setFontForImagick(\Imagick $imagick)
{
    $font = findDefaultFont();

$imagick->setFont($font);
}

// Find and set a font for the ImagickDraw object
function setFontForImagickDraw(\ImagickDraw $imagickDraw)
{
    $font = findDefaultFont();

$imagickDraw->setFont($font);
}

/**
 * Checks that a named value exists in an array and it matches
 * an expected value.
 */
function check_value(array $values, $name, $expected_value)
{
	if (array_key_exists($name, $values) !== true) {

$message = "Expected key '$name' not set. Array contains:\n";
		$message .= var_export($values, true);

throw new \Exception($message);
	}

$value = $values[$name];

$epsilon = 0.01;

if (($value < $expected_value - $epsilon) || ($value > $expected_value + $epsilon)) {
		$message = "Value for $name doesn't match expected. Expected: $expected_value, actual: $value";
		throw new \Exception($message);
	}

echo "Value for '$name' is $value which is close enough to expected $expected_value\n";
}

/**
 * Checks that a named value exists in an array and it matches
 * one of a number of expected values.
 * This function exists because the expected values for Kurtosis can
 * change when the underlying maths changes: https://github.com/ImageMagick/ImageMagick/issues/6924
 */
function check_value_posibilities(array $values, $name, array $expected_values)
{
    if (array_key_exists($name, $values) !== true) {

$message = "Expected key '$name' not set. Array contains:\n";
        $message .= var_export($values, true);

throw new \Exception($message);
    }

$value = $values[$name];

$epsilon = 0.01;

foreach ($expected_values as $expected_value) {
        if (($value > $expected_value - $epsilon) && ($value < $expected_value + $epsilon)) {
            echo "Value for '$name' is $value which is close enough to expected $expected_value\n";
            return;
        }
    }

$expected_string = implode(", ", $expected_values);

$message = "Value for $name doesn't match expected possibilities. Expected one of: $expected_string, actual: $value";
    throw new \Exception($message);
}

function check_value_with_epsilon(array $values, $name, $expected_value, $epsilon)
{
	if (array_key_exists($name, $values) !== true) {

$message = "Expected key '$name' not set. Array contains:\n";
		$message .= var_export($values, true);

throw new \Exception($message);
	}

$value = $values[$name];

echo "Value for '$name' is $value which is close enough to expected $expected_value\n";
}

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✏️ functions.inc