color.module in Drupal 9
Same filename and directory in other branches
Allows users to change the color scheme of themes.
File
core/modules/color/color.moduleView source
<?php
/**
* @file
* Allows users to change the color scheme of themes.
*/
use Drupal\Core\Url;
use Drupal\Component\Utility\Bytes;
use Drupal\Component\Utility\Color;
use Drupal\Component\Utility\Environment;
use Drupal\Core\Asset\CssOptimizer;
use Drupal\Core\Block\BlockPluginInterface;
use Drupal\Core\File\Exception\FileException;
use Drupal\Core\File\FileSystemInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Render\Element\Textfield;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\color\ColorSystemBrandingBlockAlter;
/**
* Implements hook_help().
*/
function color_help($route_name, RouteMatchInterface $route_match) {
switch ($route_name) {
case 'help.page.color':
$output = '<h3>' . t('About') . '</h3>';
$output .= '<p>' . t('The Color module allows users with the <em>Administer site configuration</em> permission to change the color scheme (color of links, backgrounds, text, and other theme elements) of compatible themes. For more information, see the <a href=":color_do">online documentation for the Color module</a>.', [
':color_do' => 'https://www.drupal.org/documentation/modules/color',
]) . '</p>';
$output .= '<h3>' . t('Uses') . '</h3>';
$output .= '<dl>';
$output .= '<dt>' . t('Changing colors') . '</dt>';
$output .= '<dd><p>' . t('To change the color settings, select the <em>Settings</em> link for your theme on the <a href=":appearance">Appearance</a> page. If the color picker does not appear then the theme is not compatible with the Color module.', [
':appearance' => Url::fromRoute('system.themes_page')
->toString(),
]) . '</p>';
$output .= '<p>' . t("The Color module saves a modified copy of the theme's specified stylesheets in the files directory. If you make any manual changes to your theme's stylesheet, <em>you must save your color settings again, even if you haven't changed the colors</em>. This step is required because the module stylesheets in the files directory need to be recreated to reflect your changes.") . '</p></dd>';
$output .= '</dl>';
return $output;
}
}
/**
* Implements hook_theme().
*/
function color_theme() {
return [
'color_scheme_form' => [
'render element' => 'form',
],
];
}
/**
* Implements hook_form_FORM_ID_alter().
*/
function color_form_system_theme_settings_alter(&$form, FormStateInterface $form_state) {
$build_info = $form_state
->getBuildInfo();
if (isset($build_info['args'][0]) && ($theme = $build_info['args'][0]) && color_get_info($theme) && function_exists('gd_info')) {
$form['color'] = [
'#type' => 'details',
'#title' => t('Color scheme'),
'#open' => TRUE,
'#weight' => -1,
'#attributes' => [
'id' => 'color_scheme_form',
],
'#theme' => 'color_scheme_form',
];
$form['color'] += color_scheme_form($form, $form_state, $theme);
$form['#validate'][] = 'color_scheme_form_validate';
// Ensure color submission happens first so we can unset extra values.
array_unshift($form['#submit'], 'color_scheme_form_submit');
}
}
/**
* Implements hook_library_info_alter().
*
* Replaces style sheets declared in libraries with color-altered style sheets.
*/
function color_library_info_alter(&$libraries, $extension) {
$themes = array_keys(\Drupal::service('theme_handler')
->listInfo());
if (in_array($extension, $themes)) {
$color_paths = \Drupal::config('color.theme.' . $extension)
->get('stylesheets');
if (!empty($color_paths)) {
foreach (array_keys($libraries) as $name) {
if (isset($libraries[$name]['css'])) {
// Override stylesheets.
foreach ($libraries[$name]['css'] as $category => $css_assets) {
foreach ($css_assets as $path => $metadata) {
// Loop over the path array with recolored CSS files to find matching
// paths which could replace the non-recolored paths.
foreach ($color_paths as $color_path) {
// Color module currently requires unique file names to be used,
// which allows us to compare different file paths.
/** @var \Drupal\Core\File\FileSystemInterface $file_system */
$file_system = \Drupal::service('file_system');
if ($file_system
->basename($path) == $file_system
->basename($color_path)) {
// Replace the path to the new css file.
// This keeps the order of the stylesheets intact.
$index = array_search($path, array_keys($libraries[$name]['css'][$category]));
$preceding_css_assets = array_slice($libraries[$name]['css'][$category], 0, $index);
$succeeding_css_assets = array_slice($libraries[$name]['css'][$category], $index + 1);
$libraries[$name]['css'][$category] = array_merge($preceding_css_assets, [
$color_path => $metadata,
], $succeeding_css_assets);
}
}
}
}
}
}
}
}
}
/**
* Implements hook_block_view_BASE_BLOCK_ID_alter().
*/
function color_block_view_system_branding_block_alter(array &$build, BlockPluginInterface $block) {
$build['#pre_render'][] = [
ColorSystemBrandingBlockAlter::class,
'preRender',
];
}
/**
* Retrieves the Color module information for a particular theme.
*/
function color_get_info($theme) {
static $theme_info = [];
if (isset($theme_info[$theme])) {
return $theme_info[$theme];
}
$path = \Drupal::service('extension.list.theme')
->getPath($theme);
$file = \Drupal::root() . '/' . $path . '/color/color.inc';
if ($path && file_exists($file)) {
include $file;
// Add in default values.
$info += [
// CSS files (excluding @import) to rewrite with new color scheme.
'css' => [],
// Files to copy.
'copy' => [],
// Gradient definitions.
'gradients' => [],
// Color areas to fill (x, y, width, height).
'fill' => [],
// Coordinates of all the theme slices (x, y, width, height) with their
// filename as used in the stylesheet.
'slices' => [],
// Reference color used for blending.
'blend_target' => '#ffffff',
];
$theme_info[$theme] = $info;
return $info;
}
}
/**
* Retrieves the color palette for a particular theme.
*/
function color_get_palette($theme, $default = FALSE) {
// Fetch and expand default palette.
$info = color_get_info($theme);
$palette = $info['schemes']['default']['colors'];
if ($default) {
return $palette;
}
// Load variable.
// @todo Default color config should be moved to yaml in the theme.
// Getting a mutable override-free object because this function is only used
// in forms. Color configuration is used to write CSS to the file system
// making configuration overrides pointless.
return \Drupal::configFactory()
->getEditable('color.theme.' . $theme)
->get('palette') ?: $palette;
}
/**
* Form constructor for the color configuration form for a particular theme.
*
* @param $theme
* The machine name of the theme whose color settings are being configured.
*
* @see color_scheme_form_validate()
* @see color_scheme_form_submit()
*/
function color_scheme_form($complete_form, FormStateInterface $form_state, $theme) {
$info = color_get_info($theme);
$info['schemes'][''] = [
'title' => t('Custom'),
'colors' => [],
];
$color_sets = [];
$schemes = [];
foreach ($info['schemes'] as $key => $scheme) {
$color_sets[$key] = $scheme['title'];
$schemes[$key] = $scheme['colors'];
$schemes[$key] += $info['schemes']['default']['colors'];
}
// See if we're using a predefined scheme.
// Note: we use the original theme when the default scheme is chosen.
// Note: we use configuration without overrides since this information is used
// in a form and therefore without doing this would bleed overrides into
// active configuration. Furthermore, color configuration is used to write
// CSS to the file system making configuration overrides pointless.
$current_scheme = \Drupal::configFactory()
->getEditable('color.theme.' . $theme)
->get('palette');
foreach ($schemes as $key => $scheme) {
if ($current_scheme == $scheme) {
$scheme_name = $key;
break;
}
}
if (empty($scheme_name)) {
if (empty($current_scheme)) {
$scheme_name = 'default';
}
else {
$scheme_name = '';
}
}
// Add scheme selector.
$default_palette = color_get_palette($theme, TRUE);
$form['scheme'] = [
'#type' => 'select',
'#title' => t('Color set'),
'#options' => $color_sets,
'#default_value' => $scheme_name,
'#attached' => [
'library' => [
'color/drupal.color',
'color/admin',
],
// Add custom JavaScript.
'drupalSettings' => [
'color' => [
'reference' => $default_palette,
'schemes' => $schemes,
],
'gradients' => $info['gradients'],
],
],
];
// Add palette fields. Use the configuration if available.
$palette = $current_scheme ?: $default_palette;
$names = $info['fields'];
$form['palette']['#tree'] = TRUE;
foreach ($palette as $name => $value) {
if (isset($names[$name])) {
$form['palette'][$name] = [
'#type' => 'textfield',
'#title' => $names[$name],
'#value_callback' => 'color_palette_color_value',
'#default_value' => $value,
'#size' => 8,
'#attributes' => [
'dir' => LanguageInterface::DIRECTION_LTR,
],
];
}
}
$form['theme'] = [
'#type' => 'value',
'#value' => $theme,
];
if (isset($info['#attached'])) {
$form['#attached'] = $info['#attached'];
unset($info['#attached']);
}
$form['info'] = [
'#type' => 'value',
'#value' => $info,
];
return $form;
}
/**
* Prepares variables for color scheme form templates.
*
* Default template: color-scheme-form.html.twig.
*
* @param array $variables
* An associative array containing:
* - form: A render element representing the form.
*/
function template_preprocess_color_scheme_form(&$variables) {
$form =& $variables['form'];
$theme = $form['theme']['#value'];
$info = $form['info']['#value'];
if (isset($info['preview_library'])) {
$form['scheme']['#attached']['library'][] = $info['preview_library'];
}
// Attempt to load preview HTML if the theme provides it.
$preview_html_path = \Drupal::root() . '/';
if (isset($info['preview_html'])) {
$preview_html_path .= \Drupal::service('extension.list.theme')
->getPath($theme) . '/' . $info['preview_html'];
}
else {
$preview_html_path .= \Drupal::service('extension.list.module')
->getPath('color') . '/preview.html';
}
$variables['html_preview']['#markup'] = file_get_contents($preview_html_path);
}
/**
* Determines the value for a palette color field.
*
* @param array $element
* The form element whose value is being populated.
* @param string|bool $input
* The incoming input to populate the form element. If this is FALSE,
* the element's default value should be returned.
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
*
* @return string
* The data that will appear in the $form_state->getValues() collection for this
* element. Return nothing to use the default.
*/
function color_palette_color_value($element, $input, FormStateInterface $form_state) {
// If we suspect a possible cross-site request forgery attack, only accept
// hexadecimal CSS color strings from user input, to avoid problems when this
// value is used in the JavaScript preview.
if ($input !== FALSE) {
// Start with the provided value for this textfield, and validate that if
// necessary, falling back on the default value.
$value = Textfield::valueCallback($element, $input, $form_state);
$complete_form = $form_state
->getCompleteForm();
if (!$value || !isset($complete_form['#token']) || color_valid_hexadecimal_string($value) || \Drupal::csrfToken()
->validate($form_state
->getValue('form_token'), $complete_form['#token'])) {
return $value;
}
else {
return $element['#default_value'];
}
}
}
/**
* Determines if a hexadecimal CSS color string is valid.
*
* @param string $color
* The string to check.
*
* @return bool
* TRUE if the string is a valid hexadecimal CSS color string, or FALSE if it
* isn't.
*/
function color_valid_hexadecimal_string($color) {
return (bool) preg_match('/^#([a-f0-9]{3}){1,2}$/iD', $color);
}
/**
* Form validation handler for color_scheme_form().
*
* @see color_scheme_form_submit()
*/
function color_scheme_form_validate($form, FormStateInterface $form_state) {
// Only accept hexadecimal CSS color strings to avoid XSS upon use.
foreach ($form_state
->getValue('palette') as $key => $color) {
if (!color_valid_hexadecimal_string($color)) {
$form_state
->setErrorByName('palette][' . $key, t('You must enter a valid hexadecimal color value for %name.', [
'%name' => $form['color']['palette'][$key]['#title'],
]));
}
}
}
/**
* Form submission handler for color_scheme_form().
*
* @see color_scheme_form_validate()
*/
function color_scheme_form_submit($form, FormStateInterface $form_state) {
// Avoid color settings spilling over to theme settings.
$color_settings = [
'theme',
'palette',
'scheme',
];
if ($form_state
->hasValue('info')) {
$color_settings[] = 'info';
}
foreach ($color_settings as $setting_name) {
${$setting_name} = $form_state
->getValue($setting_name);
$form_state
->unsetValue($setting_name);
}
if (!isset($info)) {
return;
}
$config = \Drupal::configFactory()
->getEditable('color.theme.' . $theme);
// Resolve palette.
if ($scheme != '') {
foreach ($palette as $key => $color) {
if (isset($info['schemes'][$scheme]['colors'][$key])) {
$palette[$key] = $info['schemes'][$scheme]['colors'][$key];
}
}
$palette += $info['schemes']['default']['colors'];
}
// Make sure enough memory is available.
if (isset($info['base_image'])) {
// Fetch source image dimensions.
$source = \Drupal::service('extension.list.theme')
->getPath($theme) . '/' . $info['base_image'];
list($width, $height) = getimagesize($source);
// We need at least a copy of the source and a target buffer of the same
// size (both at 32bpp).
$required = $width * $height * 8;
// We intend to prevent color scheme changes if there isn't enough memory
// available. memory_get_usage(TRUE) returns a more accurate number than
// memory_get_usage(), therefore we won't inadvertently reject a color
// scheme change based on a faulty memory calculation.
$usage = memory_get_usage(TRUE);
$memory_limit = ini_get('memory_limit');
$size = Bytes::toNumber($memory_limit);
if (!Environment::checkMemoryLimit($usage + $required, $memory_limit)) {
\Drupal::messenger()
->addError(t('There is not enough memory available to PHP to change this theme\'s color scheme. You need at least %size more. Check the <a href="http://php.net/manual/ini.core.php#ini.sect.resource-limits">PHP documentation</a> for more information.', [
'%size' => format_size($usage + $required - $size),
]));
return;
}
}
$file_system = \Drupal::service('file_system');
// Delete old files.
$files = $config
->get('files');
if (isset($files)) {
foreach ($files as $file) {
@$file_system
->unlink($file);
}
}
if (isset($file) && ($file = dirname($file))) {
@\Drupal::service('file_system')
->rmdir($file);
}
// No change in color config, use the standard theme from color.inc.
if (implode(',', color_get_palette($theme, TRUE)) == implode(',', $palette)) {
$config
->delete();
return;
}
// Prepare target locations for generated files.
$id = $theme . '-' . substr(hash('sha256', serialize($palette) . microtime()), 0, 8);
$paths['color'] = 'public://color';
$paths['target'] = $paths['color'] . '/' . $id;
/** @var \Drupal\Core\File\FileSystemInterface $file_system */
$file_system = \Drupal::service('file_system');
foreach ($paths as $path) {
$file_system
->prepareDirectory($path, FileSystemInterface::CREATE_DIRECTORY);
}
$paths['target'] = $paths['target'] . '/';
$paths['id'] = $id;
$paths['source'] = \Drupal::service('extension.list.theme')
->getPath($theme) . '/';
$paths['files'] = $paths['map'] = [];
// Save palette and logo location.
$config
->set('palette', $palette)
->set('logo', $paths['target'] . 'logo.svg')
->save();
// Copy over neutral images.
/** @var \Drupal\Core\File\FileSystemInterface $file_system */
$file_system = \Drupal::service('file_system');
foreach ($info['copy'] as $file) {
$base = $file_system
->basename($file);
$source = $paths['source'] . $file;
try {
$filepath = $file_system
->copy($source, $paths['target'] . $base);
} catch (FileException $e) {
$filepath = FALSE;
}
$paths['map'][$file] = $base;
$paths['files'][] = $filepath;
}
// Render new images, if image has been provided.
if (isset($info['base_image'])) {
_color_render_images($theme, $info, $paths, $palette);
}
// Rewrite theme stylesheets.
$css = [];
foreach ($info['css'] as $stylesheet) {
// Build a temporary array with CSS files.
$files = [];
if (file_exists($paths['source'] . $stylesheet)) {
$files[] = $stylesheet;
}
foreach ($files as $file) {
$css_optimizer = new CssOptimizer(\Drupal::service('file_url_generator'));
// Aggregate @imports recursively for each configured top level CSS file
// without optimization. Aggregation and optimization will be
// handled by drupal_build_css_cache() only.
$style = $css_optimizer
->loadFile($paths['source'] . $file, FALSE);
// Return the path to where this CSS file originated from, stripping
// off the name of the file at the end of the path.
$css_optimizer->rewriteFileURIBasePath = base_path() . dirname($paths['source'] . $file) . '/';
// Prefix all paths within this CSS file, ignoring absolute paths.
$style = preg_replace_callback('/url\\([\'"]?(?![a-z]+:|\\/+)([^\'")]+)[\'"]?\\)/i', [
$css_optimizer,
'rewriteFileURI',
], $style);
// Rewrite stylesheet with new colors.
$style = _color_rewrite_stylesheet($theme, $info, $paths, $palette, $style);
$base_file = $file_system
->basename($file);
$css[] = $paths['target'] . $base_file;
_color_save_stylesheet($paths['target'] . $base_file, $style, $paths);
}
}
// Maintain list of files.
$config
->set('stylesheets', $css)
->set('files', $paths['files'])
->save();
}
/**
* Rewrites the stylesheet to match the colors in the palette.
*/
function _color_rewrite_stylesheet($theme, &$info, &$paths, $palette, $style) {
// Prepare color conversion table.
$conversion = $palette;
foreach ($conversion as $k => $v) {
$v = mb_strtolower($v);
$conversion[$k] = Color::normalizeHexLength($v);
}
$default = color_get_palette($theme, TRUE);
// Split off the "Don't touch" section of the stylesheet.
$split = "Color Module: Don't touch";
if (strpos($style, $split) !== FALSE) {
list($style, $fixed) = explode($split, $style);
}
// Find all colors in the stylesheet and the chunks in between.
$style = preg_split('/(#[0-9a-f]{6}|#[0-9a-f]{3})/i', $style, -1, PREG_SPLIT_DELIM_CAPTURE);
$is_color = FALSE;
$output = '';
$base = 'base';
// Iterate over all the parts.
foreach ($style as $chunk) {
if ($is_color) {
$chunk = mb_strtolower($chunk);
$chunk = Color::normalizeHexLength($chunk);
// Check if this is one of the colors in the default palette.
if ($key = array_search($chunk, $default)) {
$chunk = $conversion[$key];
}
else {
$chunk = _color_shift($palette[$base], $default[$base], $chunk, $info['blend_target']);
}
}
else {
// Determine the most suitable base color for the next color.
// 'a' declarations. Use link.
if (preg_match('@[^a-z0-9_-](a)[^a-z0-9_-][^/{]*{[^{]+$@i', $chunk)) {
$base = 'link';
}
elseif (preg_match('/(?<!-)color[^{:]*:[^{#]*$/i', $chunk)) {
$base = 'text';
}
else {
$base = 'base';
}
}
$output .= $chunk;
$is_color = !$is_color;
}
// Append fixed colors segment.
if (isset($fixed)) {
$output .= $fixed;
}
// Replace paths to images.
foreach ($paths['map'] as $before => $after) {
$before = base_path() . $paths['source'] . $before;
$before = preg_replace('`(^|/)(?!../)([^/]+)/../`', '$1', $before);
$output = str_replace($before, $after, $output);
}
return $output;
}
/**
* Saves the rewritten stylesheet to disk.
*/
function _color_save_stylesheet($file, $style, &$paths) {
$filepath = \Drupal::service('file_system')
->saveData($style, $file, FileSystemInterface::EXISTS_REPLACE);
$paths['files'][] = $filepath;
// Set standard file permissions for webserver-generated files.
\Drupal::service('file_system')
->chmod($file);
}
/**
* Renders images that match a given palette.
*/
function _color_render_images($theme, &$info, &$paths, $palette) {
// Prepare template image.
$source = $paths['source'] . '/' . $info['base_image'];
$source = imagecreatefrompng($source);
$width = imagesx($source);
$height = imagesy($source);
// Prepare target buffer.
$target = imagecreatetruecolor($width, $height);
imagealphablending($target, TRUE);
// Fill regions of solid color.
foreach ($info['fill'] as $color => $fill) {
imagefilledrectangle($target, $fill[0], $fill[1], $fill[0] + $fill[2], $fill[1] + $fill[3], _color_gd($target, $palette[$color]));
}
// Render gradients.
foreach ($info['gradients'] as $gradient) {
// Get direction of the gradient.
if (isset($gradient['direction']) && $gradient['direction'] == 'horizontal') {
// Horizontal gradient.
for ($x = 0; $x < $gradient['dimension'][2]; $x++) {
$color = _color_blend($target, $palette[$gradient['colors'][0]], $palette[$gradient['colors'][1]], $x / ($gradient['dimension'][2] - 1));
imagefilledrectangle($target, $gradient['dimension'][0] + $x, $gradient['dimension'][1], $gradient['dimension'][0] + $x + 1, $gradient['dimension'][1] + $gradient['dimension'][3], $color);
}
}
else {
// Vertical gradient.
for ($y = 0; $y < $gradient['dimension'][3]; $y++) {
$color = _color_blend($target, $palette[$gradient['colors'][0]], $palette[$gradient['colors'][1]], $y / ($gradient['dimension'][3] - 1));
imagefilledrectangle($target, $gradient['dimension'][0], $gradient['dimension'][1] + $y, $gradient['dimension'][0] + $gradient['dimension'][2], $gradient['dimension'][1] + $y + 1, $color);
}
}
}
// Blend over template.
imagecopy($target, $source, 0, 0, 0, 0, $width, $height);
// Clean up template image.
imagedestroy($source);
// Cut out slices.
foreach ($info['slices'] as $file => $coord) {
list($x, $y, $width, $height) = $coord;
/** @var \Drupal\Core\File\FileSystemInterface $file_system */
$file_system = \Drupal::service('file_system');
$base = $file_system
->basename($file);
$image = $file_system
->realpath($paths['target'] . $base);
// Cut out slice.
if ($file == 'screenshot.png') {
$slice = imagecreatetruecolor(150, 90);
imagecopyresampled($slice, $target, 0, 0, $x, $y, 150, 90, $width, $height);
\Drupal::configFactory()
->getEditable('color.theme.' . $theme)
->set('screenshot', $image)
->save();
}
else {
$slice = imagecreatetruecolor($width, $height);
imagecopy($slice, $target, 0, 0, $x, $y, $width, $height);
}
// Save image.
imagepng($slice, $image);
imagedestroy($slice);
$paths['files'][] = $image;
// Set standard file permissions for webserver-generated files.
$file_system
->chmod($image);
// Build before/after map of image paths.
$paths['map'][$file] = $base;
}
// Clean up target buffer.
imagedestroy($target);
}
/**
* Shifts a given color, using a reference pair and a target blend color.
*
* Note: this function is significantly different from the JS version, as it
* is written to match the blended images perfectly.
*
* Constraint: if (ref2 == target + (ref1 - target) * delta) for some fraction
* delta then (return == target + (given - target) * delta).
*
* Loose constraint: Preserve relative positions in saturation and luminance
* space.
*/
function _color_shift($given, $ref1, $ref2, $target) {
// We assume that ref2 is a blend of ref1 and target and find
// delta based on the length of the difference vectors.
// delta = 1 - |ref2 - ref1| / |white - ref1|
$target = _color_unpack($target, TRUE);
$ref1 = _color_unpack($ref1, TRUE);
$ref2 = _color_unpack($ref2, TRUE);
$numerator = 0;
$denominator = 0;
for ($i = 0; $i < 3; ++$i) {
$numerator += ($ref2[$i] - $ref1[$i]) * ($ref2[$i] - $ref1[$i]);
$denominator += ($target[$i] - $ref1[$i]) * ($target[$i] - $ref1[$i]);
}
$delta = $denominator > 0 ? 1 - sqrt($numerator / $denominator) : 0;
// Calculate the color that ref2 would be if the assumption was true.
for ($i = 0; $i < 3; ++$i) {
$ref3[$i] = $target[$i] + ($ref1[$i] - $target[$i]) * $delta;
}
// If the assumption is not true, there is a difference between ref2 and ref3.
// We measure this in HSL space. Notation: x' = hsl(x).
$ref2 = _color_rgb2hsl($ref2);
$ref3 = _color_rgb2hsl($ref3);
for ($i = 0; $i < 3; ++$i) {
$shift[$i] = $ref2[$i] - $ref3[$i];
}
// Take the given color, and blend it towards the target.
$given = _color_unpack($given, TRUE);
for ($i = 0; $i < 3; ++$i) {
$result[$i] = $target[$i] + ($given[$i] - $target[$i]) * $delta;
}
// Finally, we apply the extra shift in HSL space.
// Note: if ref2 is a pure blend of ref1 and target, then |shift| = 0.
$result = _color_rgb2hsl($result);
for ($i = 0; $i < 3; ++$i) {
$result[$i] = min(1, max(0, $result[$i] + $shift[$i]));
}
$result = _color_hsl2rgb($result);
// Return hex color.
return _color_pack($result, TRUE);
}
/**
* Converts a hex triplet into a GD color.
*/
function _color_gd($img, $hex) {
$c = array_merge([
$img,
], _color_unpack($hex));
return call_user_func_array('imagecolorallocate', $c);
}
/**
* Blends two hex colors and returns the GD color.
*/
function _color_blend($img, $hex1, $hex2, $alpha) {
$in1 = _color_unpack($hex1);
$in2 = _color_unpack($hex2);
$out = [
$img,
];
for ($i = 0; $i < 3; ++$i) {
$out[] = $in1[$i] + ($in2[$i] - $in1[$i]) * $alpha;
}
return call_user_func_array('imagecolorallocate', $out);
}
/**
* Converts a hex color into an RGB triplet.
*/
function _color_unpack($hex, $normalize = FALSE) {
$hex = substr($hex, 1);
if (strlen($hex) == 3) {
$hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
}
$c = hexdec($hex);
for ($i = 16; $i >= 0; $i -= 8) {
$out[] = ($c >> $i & 0xff) / ($normalize ? 255 : 1);
}
return $out;
}
/**
* Converts an RGB triplet to a hex color.
*/
function _color_pack($rgb, $normalize = FALSE) {
$out = 0;
foreach ($rgb as $k => $v) {
$out |= $v * ($normalize ? 255 : 1) << 16 - $k * 8;
}
return '#' . str_pad(dechex($out), 6, 0, STR_PAD_LEFT);
}
/**
* Converts an HSL triplet into RGB.
*/
function _color_hsl2rgb($hsl) {
$h = $hsl[0];
$s = $hsl[1];
$l = $hsl[2];
$m2 = $l <= 0.5 ? $l * ($s + 1) : $l + $s - $l * $s;
$m1 = $l * 2 - $m2;
return [
_color_hue2rgb($m1, $m2, $h + 0.33333),
_color_hue2rgb($m1, $m2, $h),
_color_hue2rgb($m1, $m2, $h - 0.33333),
];
}
/**
* Helper function for _color_hsl2rgb().
*/
function _color_hue2rgb($m1, $m2, $h) {
$h = $h < 0 ? $h + 1 : ($h > 1 ? $h - 1 : $h);
if ($h * 6 < 1) {
return $m1 + ($m2 - $m1) * $h * 6;
}
if ($h * 2 < 1) {
return $m2;
}
if ($h * 3 < 2) {
return $m1 + ($m2 - $m1) * (0.66666 - $h) * 6;
}
return $m1;
}
/**
* Converts an RGB triplet to HSL.
*/
function _color_rgb2hsl($rgb) {
$r = $rgb[0];
$g = $rgb[1];
$b = $rgb[2];
$min = min($r, min($g, $b));
$max = max($r, max($g, $b));
$delta = $max - $min;
$l = ($min + $max) / 2;
$s = 0;
if ($l > 0 && $l < 1) {
$s = $delta / ($l < 0.5 ? 2 * $l : 2 - 2 * $l);
}
$h = 0;
if ($delta > 0) {
if ($max == $r && $max != $g) {
$h += ($g - $b) / $delta;
}
if ($max == $g && $max != $b) {
$h += 2 + ($b - $r) / $delta;
}
if ($max == $b && $max != $r) {
$h += 4 + ($r - $g) / $delta;
}
$h /= 6;
}
return [
$h,
$s,
$l,
];
}Functions
Name |
Description |
|---|---|
| color_block_view_system_branding_block_alter | Implements hook_block_view_BASE_BLOCK_ID_alter(). |
| color_form_system_theme_settings_alter | Implements hook_form_FORM_ID_alter(). |
| color_get_info | Retrieves the Color module information for a particular theme. |
| color_get_palette | Retrieves the color palette for a particular theme. |
| color_help | Implements hook_help(). |
| color_library_info_alter | Implements hook_library_info_alter(). |
| color_palette_color_value | Determines the value for a palette color field. |
| color_scheme_form | Form constructor for the color configuration form for a particular theme. |
| color_scheme_form_submit | Form submission handler for color_scheme_form(). |
| color_scheme_form_validate | Form validation handler for color_scheme_form(). |
| color_theme | Implements hook_theme(). |
| color_valid_hexadecimal_string | Determines if a hexadecimal CSS color string is valid. |
| template_preprocess_color_scheme_form | Prepares variables for color scheme form templates. |
| _color_blend | Blends two hex colors and returns the GD color. |
| _color_gd | Converts a hex triplet into a GD color. |
| _color_hsl2rgb | Converts an HSL triplet into RGB. |
| _color_hue2rgb | Helper function for _color_hsl2rgb(). |
| _color_pack | Converts an RGB triplet to a hex color. |
| _color_render_images | Renders images that match a given palette. |
| _color_rewrite_stylesheet | Rewrites the stylesheet to match the colors in the palette. |
| _color_rgb2hsl | Converts an RGB triplet to HSL. |
| _color_save_stylesheet | Saves the rewritten stylesheet to disk. |
| _color_shift | Shifts a given color, using a reference pair and a target blend color. |
| _color_unpack | Converts a hex color into an RGB triplet. |