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Dir : ~/proc/self/root/usr/local/src/imagick/tests/

Edit File: 081_Imagick_getImageHistogram_basic.phpt

--TEST--
Test Imagick, getImageHistogram
--SKIPIF--
<?php 
require_once(dirname(__FILE__) . '/skipif.inc');
checkFormatPresent('png');
?>
--FILE--
<?php

function getColorStatistics($histogramElements, $colorChannel) {
    $colorStatistics = array();

foreach ($histogramElements as $histogramElement) {
        //So broken. Wow. Much surprise. Sad. Bad. Sad, bad, sad.
        //$color = $histogramElement->getColorValueQuantum($colorChannel);
        $color = $histogramElement->getColorValue($colorChannel);
        $color = intval($color * 255);
        $count = $histogramElement->getColorCount();

if (array_key_exists($color, $colorStatistics)) {
            $colorStatistics[$color] += $count;
        }
        else {
            $colorStatistics[$color] = $count;
        }
    }

ksort($colorStatistics);
    
    return $colorStatistics;
}

function getImageHistogram() {

$backgroundColor = 'black';

$draw = new \ImagickDraw();
    $draw->setStrokeWidth(0); //Lines have a wi

$imagick = new \Imagick();
    $imagick->newImage(500, 500, $backgroundColor);
    $imagick->setImageFormat("png");
    $imagick->drawImage($draw);

$histogramWidth = 256;
    $histogramHeight = 100; // the height for each RGB segment

$imagick = new \Imagick();
    $imagick->newPseudoImage(640, 480, "magick:logo");
    //Resize the image to be small, otherwise PHP tends to run out of memory
    //This might lead to bad results for images that are pathologically 'pixelly'
    $imagick->adaptiveResizeImage(200, 200, true);
    $histogramElements = $imagick->getImageHistogram();

$histogram = new \Imagick();
    $histogram->newpseudoimage($histogramWidth, $histogramHeight * 3, 'xc:black');
    $histogram->setImageFormat('png');

$getMax = function ($carry, $item)  {
        if ($item > $carry) {
            return $item;
        }
        return $carry;
    };

$colorValues = array(
        'red' => getColorStatistics($histogramElements, \Imagick::COLOR_RED),
        'lime' => getColorStatistics($histogramElements, \Imagick::COLOR_GREEN),
        'blue' => getColorStatistics($histogramElements, \Imagick::COLOR_BLUE),
    );

$max = array_reduce($colorValues['red'] , $getMax, 0);
    $max = array_reduce($colorValues['lime'] , $getMax, $max);
    $max = array_reduce($colorValues['blue'] , $getMax, $max);

$scale =  $histogramHeight / $max;

$count = 0;
    foreach ($colorValues as $color => $values) {
        $draw->setstrokecolor($color);

$offset = ($count + 1) * $histogramHeight;

foreach ($values as $index => $value) {
            $draw->line($index, $offset, $index, $offset - ($value * $scale));
        }
        $count++;
    }

$histogram->drawImage($draw);
    $bytes = $histogram->getImageBlob();
    if (strlen($bytes) <= 0) { echo "Failed to generate image.";} 
}

getImageHistogram();
echo "Ok";
?>
--EXPECTF--
Ok