function ImageToolkitGdTestCase::testManipulations in Drupal 7

Since PHP can't visually check that our images have been manipulated properly, build a list of expected color values for each of the corners and the expected height and widths for the final images.

File

modules/simpletest/tests/image.test, line 264

Tests for core image handling API.

Class

ImageToolkitGdTestCase

Test the core GD image manipulation functions.

Code

function testManipulations() {

  // If GD isn't available don't bother testing this.
  module_load_include('inc', 'system', 'image.gd');
  if (!function_exists('image_gd_check_settings') || !image_gd_check_settings()) {
    $this
      ->pass(t('Image manipulations for the GD toolkit were skipped because the GD toolkit is not available.'));
    return;
  }

  // Typically the corner colors will be unchanged. These colors are in the
  // order of top-left, top-right, bottom-right, bottom-left.
  $default_corners = array(
    $this->red,
    $this->green,
    $this->blue,
    $this->transparent,
  );

  // A list of files that will be tested.
  $files = array(
    'image-test.png',
    'image-test.gif',
    'image-test-no-transparency.gif',
    'image-test.jpg',
  );

  // Setup a list of tests to perform on each type.
  $operations = array(
    'resize' => array(
      'function' => 'resize',
      'arguments' => array(
        20,
        10,
      ),
      'width' => 20,
      'height' => 10,
      'corners' => $default_corners,
    ),
    'scale_x' => array(
      'function' => 'scale',
      'arguments' => array(
        20,
        NULL,
      ),
      'width' => 20,
      'height' => 10,
      'corners' => $default_corners,
    ),
    'scale_y' => array(
      'function' => 'scale',
      'arguments' => array(
        NULL,
        10,
      ),
      'width' => 20,
      'height' => 10,
      'corners' => $default_corners,
    ),
    'upscale_x' => array(
      'function' => 'scale',
      'arguments' => array(
        80,
        NULL,
        TRUE,
      ),
      'width' => 80,
      'height' => 40,
      'corners' => $default_corners,
    ),
    'upscale_y' => array(
      'function' => 'scale',
      'arguments' => array(
        NULL,
        40,
        TRUE,
      ),
      'width' => 80,
      'height' => 40,
      'corners' => $default_corners,
    ),
    'crop' => array(
      'function' => 'crop',
      'arguments' => array(
        12,
        4,
        16,
        12,
      ),
      'width' => 16,
      'height' => 12,
      'corners' => array_fill(0, 4, $this->white),
    ),
    'scale_and_crop' => array(
      'function' => 'scale_and_crop',
      'arguments' => array(
        10,
        8,
      ),
      'width' => 10,
      'height' => 8,
      'corners' => array_fill(0, 4, $this->black),
    ),
  );

  // Systems using non-bundled GD2 don't have imagerotate. Test if available.
  // @todo Remove the version check once https://www.drupal.org/node/2918570
  //   is resolved.
  if (function_exists('imagerotate') && (version_compare(PHP_VERSION, '7.0.26', '<') || version_compare(PHP_VERSION, '7.1', '>=') && version_compare(PHP_VERSION, '7.1.12', '<'))) {
    $operations += array(
      'rotate_90' => array(
        'function' => 'rotate',
        'arguments' => array(
          90,
          0xff00ff,
        ),
        // Fuchsia background.
        'width' => 20,
        'height' => 40,
        'corners' => array(
          $this->fuchsia,
          $this->red,
          $this->green,
          $this->blue,
        ),
      ),
      'rotate_transparent_90' => array(
        'function' => 'rotate',
        'arguments' => array(
          90,
        ),
        'width' => 20,
        'height' => 40,
        'corners' => array(
          $this->transparent,
          $this->red,
          $this->green,
          $this->blue,
        ),
      ),
    );

    // As of PHP version 5.5, GD uses a different algorithm to rotate images
    // than version 5.4 and below, resulting in different dimensions.
    // See https://bugs.php.net/bug.php?id=65148.
    // For the 40x20 test images, the dimensions resulting from rotation will
    // be 1 pixel smaller in both width and height in PHP 5.5 and above.
    // @todo: The PHP bug was fixed in PHP 7.0.26 and 7.1.12. Change the code
    //   below to reflect that in https://www.drupal.org/node/2918570.
    if (version_compare(PHP_VERSION, '5.5', '>=')) {
      $operations += array(
        'rotate_5' => array(
          'function' => 'rotate',
          'arguments' => array(
            5,
            0xff00ff,
          ),
          // Fuchsia background.
          'width' => 41,
          'height' => 23,
          'corners' => array_fill(0, 4, $this->fuchsia),
        ),
        'rotate_transparent_5' => array(
          'function' => 'rotate',
          'arguments' => array(
            5,
          ),
          'width' => 41,
          'height' => 23,
          'corners' => array_fill(0, 4, $this->rotate_transparent),
        ),
      );
    }
    else {
      $operations += array(
        'rotate_5' => array(
          'function' => 'rotate',
          'arguments' => array(
            5,
            0xff00ff,
          ),
          // Fuchsia background.
          'width' => 42,
          'height' => 24,
          'corners' => array_fill(0, 4, $this->fuchsia),
        ),
        'rotate_transparent_5' => array(
          'function' => 'rotate',
          'arguments' => array(
            5,
          ),
          'width' => 42,
          'height' => 24,
          'corners' => array_fill(0, 4, $this->rotate_transparent),
        ),
      );
    }
  }

  // Systems using non-bundled GD2 don't have imagefilter. Test if available.
  if (function_exists('imagefilter')) {
    $operations += array(
      'desaturate' => array(
        'function' => 'desaturate',
        'arguments' => array(),
        'height' => 20,
        'width' => 40,
        // Grayscale corners are a bit funky. Each of the corners are a shade of
        // gray. The values of these were determined simply by looking at the
        // final image to see what desaturated colors end up being.
        'corners' => array(
          array_fill(0, 3, 76) + array(
            3 => 0,
          ),
          array_fill(0, 3, 149) + array(
            3 => 0,
          ),
          array_fill(0, 3, 29) + array(
            3 => 0,
          ),
          array_fill(0, 3, 225) + array(
            3 => 127,
          ),
        ),
      ),
    );
  }
  foreach ($files as $file) {
    foreach ($operations as $op => $values) {

      // Load up a fresh image.
      $image = image_load(drupal_get_path('module', 'simpletest') . '/files/' . $file, 'gd');
      if (!$image) {
        $this
          ->fail(t('Could not load image %file.', array(
          '%file' => $file,
        )));
        continue 2;
      }

      // All images should be converted to truecolor when loaded.
      $image_truecolor = imageistruecolor($image->resource);
      $this
        ->assertTrue($image_truecolor, format_string('Image %file after load is a truecolor image.', array(
        '%file' => $file,
      )));
      if ($image->info['extension'] == 'gif') {
        if ($op == 'desaturate') {

          // Transparent GIFs and the imagefilter function don't work together.
          $values['corners'][3][3] = 0;
        }
      }

      // Perform our operation.
      $function = 'image_' . $values['function'];
      $arguments = array();
      $arguments[] =& $image;
      $arguments = array_merge($arguments, $values['arguments']);
      call_user_func_array($function, $arguments);

      // To keep from flooding the test with assert values, make a general
      // value for whether each group of values fail.
      $correct_dimensions_real = TRUE;
      $correct_dimensions_object = TRUE;
      $correct_colors = TRUE;

      // Check the real dimensions of the image first.
      if (imagesy($image->resource) != $values['height'] || imagesx($image->resource) != $values['width']) {
        $correct_dimensions_real = FALSE;
      }

      // Check that the image object has an accurate record of the dimensions.
      if ($image->info['width'] != $values['width'] || $image->info['height'] != $values['height']) {
        $correct_dimensions_object = FALSE;
      }

      // Now check each of the corners to ensure color correctness.
      foreach ($values['corners'] as $key => $corner) {

        // The test gif that does not have transparency has yellow where the
        // others have transparent.
        if ($file === 'image-test-no-transparency.gif' && $corner === $this->transparent) {
          $corner = $this->yellow;
        }

        // Get the location of the corner.
        switch ($key) {
          case 0:
            $x = 0;
            $y = 0;
            break;
          case 1:
            $x = $values['width'] - 1;
            $y = 0;
            break;
          case 2:
            $x = $values['width'] - 1;
            $y = $values['height'] - 1;
            break;
          case 3:
            $x = 0;
            $y = $values['height'] - 1;
            break;
        }
        $color = $this
          ->getPixelColor($image, $x, $y);
        $correct_colors = $this
          ->colorsAreEqual($color, $corner);
      }
      $directory = file_default_scheme() . '://imagetests';
      file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
      $file_path = $directory . '/' . $op . '.' . $image->info['extension'];
      image_save($image, $file_path);
      $this
        ->assertTrue($correct_dimensions_real, format_string('Image %file after %action action has proper dimensions.', array(
        '%file' => $file,
        '%action' => $op,
      )));
      $this
        ->assertTrue($correct_dimensions_object, format_string('Image %file object after %action action is reporting the proper height and width values.', array(
        '%file' => $file,
        '%action' => $op,
      )));

      // JPEG colors will always be messed up due to compression.
      if ($image->info['extension'] != 'jpg') {
        $this
          ->assertTrue($correct_colors, format_string('Image %file object after %action action has the correct color placement.', array(
          '%file' => $file,
          '%action' => $op,
        )));
      }
    }

    // Check that saved image reloads without raising PHP errors.
    $image_reloaded = image_load($file_path);
  }
}