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<?php

/**

 * @file

 * Functions needed to execute image effects provided by Image module.

 */

/**

 * Implements hook_image_effect_info().

 */

function image_image_effect_info() {

  $effects = array(

    'image_resize' => array(

      'label' => t('Resize'),

      'help' => t('Resizing will make images an exact set of dimensions. This may cause images to be stretched or shrunk disproportionately.'),

      'effect callback' => 'image_resize_effect',

      'dimensions callback' => 'image_resize_dimensions',

      'form callback' => 'image_resize_form',

      'summary theme' => 'image_resize_summary',

    ),

    'image_scale' => array(

      'label' => t('Scale'),

      'help' => t('Scaling will maintain the aspect-ratio of the original image. If only a single dimension is specified, the other dimension will be calculated.'),

      'effect callback' => 'image_scale_effect',

      'dimensions callback' => 'image_scale_dimensions',

      'form callback' => 'image_scale_form',

      'summary theme' => 'image_scale_summary',

    ),

    'image_scale_and_crop' => array(

      'label' => t('Scale and crop'),

      'help' => t('Scale and crop will maintain the aspect-ratio of the original image, then crop the larger dimension. This is most useful for creating perfectly square thumbnails without stretching the image.'),

      'effect callback' => 'image_scale_and_crop_effect',

      'dimensions callback' => 'image_resize_dimensions',

      'form callback' => 'image_resize_form',

      'summary theme' => 'image_resize_summary',

    ),

    'image_crop' => array(

      'label' => t('Crop'),

      'help' => t('Cropping will remove portions of an image to make it the specified dimensions.'),

      'effect callback' => 'image_crop_effect',

      'dimensions callback' => 'image_resize_dimensions',

      'form callback' => 'image_crop_form',

      'summary theme' => 'image_crop_summary',

    ),

    'image_desaturate' => array(

      'label' => t('Desaturate'),

      'help' => t('Desaturate converts an image to grayscale.'),

      'effect callback' => 'image_desaturate_effect',

      'dimensions passthrough' => TRUE,

    ),

    'image_rotate' => array(

      'label' => t('Rotate'),

      'help' => t('Rotating an image may cause the dimensions of an image to increase to fit the diagonal.'),

      'effect callback' => 'image_rotate_effect',

      'dimensions callback' => 'image_rotate_dimensions',

      'form callback' => 'image_rotate_form',

      'summary theme' => 'image_rotate_summary',

    ),

  );

  return $effects;

}

/**

 * Image effect callback; Resize an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the resize effect with the

 *   following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 *

 * @return

 *   TRUE on success. FALSE on failure to resize image.

 *

 * @see image_resize()

 */

function image_resize_effect(&$image, $data) {

  if (!image_resize($image, $data['width'], $data['height'])) {

    watchdog('image', 'Image resize failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image dimensions callback; Resize.

 *

 * @param $dimensions

 *   Dimensions to be modified - an array with components width and height, in

 *   pixels.

 * @param $data

 *   An array of attributes to use when performing the resize effect with the

 *   following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 */

function image_resize_dimensions(array &$dimensions, array $data) {

  // The new image will have the exact dimensions defined for the effect.

  $dimensions['width'] = $data['width'];

  $dimensions['height'] = $data['height'];

}

/**

 * Image effect callback; Scale an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the scale effect with the

 *   following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 *   - "upscale": A boolean indicating that the image should be upscaled if the

 *     dimensions are larger than the original image.

 *

 * @return

 *   TRUE on success. FALSE on failure to scale image.

 *

 * @see image_scale()

 */

function image_scale_effect(&$image, $data) {

  // Set sane default values.

  $data += array(

    'width' => NULL,

    'height' => NULL,

    'upscale' => FALSE,

  );

  if (!image_scale($image, $data['width'], $data['height'], $data['upscale'])) {

    watchdog('image', 'Image scale failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image dimensions callback; Scale.

 *

 * @param $dimensions

 *   Dimensions to be modified - an array with components width and height, in

 *   pixels.

 * @param $data

 *   An array of attributes to use when performing the scale effect with the

 *   following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 *   - "upscale": A boolean indicating that the image should be upscaled if the

 *     dimensions are larger than the original image.

 */

function image_scale_dimensions(array &$dimensions, array $data) {

  if ($dimensions['width'] && $dimensions['height']) {

    image_dimensions_scale($dimensions, $data['width'], $data['height'], $data['upscale']);

  }

}

/**

 * Image effect callback; Crop an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the crop effect with the

 *   following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 *   - "anchor": A string describing where the crop should originate in the form

 *     of "XOFFSET-YOFFSET". XOFFSET is either a number of pixels or

 *     "left", "center", "right" and YOFFSET is either a number of pixels or

 *     "top", "center", "bottom".

 * @return

 *   TRUE on success. FALSE on failure to crop image.

 * @see image_crop()

 */

function image_crop_effect(&$image, $data) {

  // Set sane default values.

  $data += array(

    'anchor' => 'center-center',

  );

  list($x, $y) = explode('-', $data['anchor']);

  $x = image_filter_keyword($x, $image->info['width'], $data['width']);

  $y = image_filter_keyword($y, $image->info['height'], $data['height']);

  if (!image_crop($image, $x, $y, $data['width'], $data['height'])) {

    watchdog('image', 'Image crop failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image effect callback; Scale and crop an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the scale and crop effect

 *   with the following items:

 *   - "width": An integer representing the desired width in pixels.

 *   - "height": An integer representing the desired height in pixels.

 * @return

 *   TRUE on success. FALSE on failure to scale and crop image.

 * @see image_scale_and_crop()

 */

function image_scale_and_crop_effect(&$image, $data) {

  if (!image_scale_and_crop($image, $data['width'], $data['height'])) {

    watchdog('image', 'Image scale and crop failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image effect callback; Desaturate (grayscale) an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the desaturate effect.

 * @return

 *   TRUE on success. FALSE on failure to desaturate image.

 * @see image_desaturate()

 */

function image_desaturate_effect(&$image, $data) {

  if (!image_desaturate($image)) {

    watchdog('image', 'Image desaturate failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image effect callback; Rotate an image resource.

 *

 * @param $image

 *   An image object returned by image_load().

 * @param $data

 *   An array of attributes to use when performing the rotate effect containing

 *   the following items:

 *   - "degrees": The number of (clockwise) degrees to rotate the image.

 *   - "random": A boolean indicating that a random rotation angle should be

 *     used for this image. The angle specified in "degrees" is used as a

 *     positive and negative maximum.

 *   - "bgcolor": The background color to use for exposed areas of the image.

 *     Use web-style hex colors (#FFFFFF for white, #000000 for black). Leave

 *     blank for transparency on image types that support it.

 * @return

 *   TRUE on success. FALSE on failure to rotate image.

 * @see image_rotate().

 */

function image_rotate_effect(&$image, $data) {

  // Set sane default values.

  $data += array(

    'degrees' => 0,

    'bgcolor' => NULL,

    'random' => FALSE,

  );

  // Convert short #FFF syntax to full #FFFFFF syntax.

  if (strlen($data['bgcolor']) == 4) {

    $c = $data['bgcolor'];

    $data['bgcolor'] = $c[0] . $c[1] . $c[1] . $c[2] . $c[2] . $c[3] . $c[3];

  }

  // Convert #FFFFFF syntax to hexadecimal colors.

  if ($data['bgcolor'] != '') {

    $data['bgcolor'] = hexdec(str_replace('#', '0x', $data['bgcolor']));

  }

  else {

    $data['bgcolor'] = NULL;

  }

  if (!empty($data['random'])) {

    $degrees = abs((float) $data['degrees']);

    $data['degrees'] = rand(-1 * $degrees, $degrees);

  }

  if (!image_rotate($image, $data['degrees'], $data['bgcolor'])) {

    watchdog('image', 'Image rotate failed using the %toolkit toolkit on %path (%mimetype, %dimensions)', array('%toolkit' => $image->toolkit, '%path' => $image->source, '%mimetype' => $image->info['mime_type'], '%dimensions' => $image->info['width'] . 'x' . $image->info['height']), WATCHDOG_ERROR);

    return FALSE;

  }

  return TRUE;

}

/**

 * Image dimensions callback; Rotate.

 *

 * @param $dimensions

 *   Dimensions to be modified - an array with components width and height, in

 *   pixels.

 * @param $data

 *   An array of attributes to use when performing the rotate effect containing

 *   the following items:

 *   - "degrees": The number of (clockwise) degrees to rotate the image.

 *   - "random": A boolean indicating that a random rotation angle should be

 *     used for this image. The angle specified in "degrees" is used as a

 *     positive and negative maximum.

 */

function image_rotate_dimensions(array &$dimensions, array $data) {

  // If the rotate is not random and the angle is a multiple of 90 degrees,

  // then the new dimensions can be determined.

  if (!$data['random'] && ((int) ($data['degrees']) == $data['degrees']) && ($data['degrees'] % 90 == 0)) {

    if ($data['degrees'] % 180 != 0) {

      $temp = $dimensions['width'];

      $dimensions['width'] = $dimensions['height'];

      $dimensions['height'] = $temp;

    }

  }

  else {

    $dimensions['width'] = $dimensions['height'] = NULL;

  }

}