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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;
}
}