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<?php
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/**
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* Utility form, conversion and rendering functions for image processes
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*/
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/**
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* Prepare a subform for displaying RGB fields
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*
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* Helper function to render a common element.
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*/
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function imagecache_rgb_form($action) {
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if($action['HEX'] && $deduced = hex_to_rgb($action['HEX'])) {
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$action = array_merge($action, $deduced);
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}
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$form = array('#theme' => 'canvasactions_rgb_form');
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$form['red'] = array( '#type' => 'textfield', '#title' => t('Red'), '#default_value' => $action['red'], '#size' => 3);
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$form['green'] = array( '#type' => 'textfield', '#title' => t('Green'), '#default_value' => $action['green'], '#size' => 3);
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$form['blue'] = array( '#type' => 'textfield', '#title' => t('Blue'), '#default_value' => $action['blue'], '#size' => 3);
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$form['HEX'] = array( '#type' => 'textfield', '#title' => t('HEX'), '#default_value' => $action['HEX'], '#size' => 7);
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return $form;
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}
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/**
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* Prepare a subform for displaying positioning fields
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*
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* Helper function to render a common element.
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*/
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function canvasactions_pos_form($action) {
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$form = array(
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#'#theme' => 'canvasactions_pos_form',
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'xpos' => array(
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'#type' => 'textfield',
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'#title' => t('X offset'),
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'#default_value' => isset($action['xpos']) ? $action['xpos'] : 'center',
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'#size' => 6,
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'#description' => t('Enter an offset in pixels or use a keyword: <em>left</em>, <em>center</em>, or <em>right</em>.'),
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),
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'ypos' => array(
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'#type' => 'textfield',
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'#title' => t('Y offset'),
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'#default_value' => isset($action['ypos']) ? $action['ypos'] : 'center',
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'#size' => 6,
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'#description' => t('Enter an offset in pixels or use a keyword: <em>top</em>, <em>center</em>, or <em>bottom</em>.'),
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),
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);
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return $form;
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}
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/**
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* Render the subform in a table
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*/
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function theme_canvasactions_rgb_form(&$form) {
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$header = array();
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$table = array();
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foreach (element_children($form) as $key) {
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$header[$key] = $form[$key]['#title'];
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unset($form[$key]['#title']);
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$table['field'][$key] = drupal_render($form[$key]);
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}
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$output .= theme('table', $header, $table);
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$output .= t('Enter colors in decimal, 0-255, or in HEX. If HEX is set, it will take priority.');
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$output .= drupal_render($form);
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return $output;
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}
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function theme_canvasactions_rgb($rgb) {
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if($rgb['HEX'] && $deduced = hex_to_rgb($rgb['HEX'])) {
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$rgb = array_merge($rgb, $deduced);
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}
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if ($rgb['red'] || $rgb['green'] || $rgb['blue']) {
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$output .= ' RGB:['. $rgb['red'] .', '. $rgb['green'] .', '. $rgb['blue'] .'] #'. $rgb['HEX'];
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}
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else {
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$output .= ' ' .t('Transparent');
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}
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return $output;
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}
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/**
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* Decode an HTML hex-code into an array of R, G, and B values.
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* accepts these formats: (case insensitive) #ffffff, ffffff, #fff, fff
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*/
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function hex_to_rgb($hex) {
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$hex = trim($hex);
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// remove '#'
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if (substr($hex, 0, 1) == '#')
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$hex = substr($hex, 1) ;
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// expand short form ('fff') color
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if (strlen($hex) == 3) {
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$hex = substr($hex, 0, 1) . substr($hex, 0, 1) .
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substr($hex, 1, 1) . substr($hex, 1, 1) .
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substr($hex, 2, 1) . substr($hex, 2, 1) ;
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}
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if (strlen($hex) != 6)
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trigger_error('Error: Invalid color "'. $hex .'"') ;
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// convert
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$rgb['red'] = hexdec(substr($hex, 0, 2)) ;
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$rgb['green'] = hexdec(substr($hex, 2, 2)) ;
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$rgb['blue'] = hexdec(substr($hex, 4, 2)) ;
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return $rgb ;
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}
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