A super easy PHP Framework for web development!
https://github.com/exacti/phacil-framework
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
322 lines
12 KiB
322 lines
12 KiB
<?php
|
|
/* PROJECT INFO --------------------------------------------------------------------------------------------------------
|
|
Version: 1.5.2
|
|
Changelog: http://adaptive-images.com/changelog.txt
|
|
|
|
Homepage: http://adaptive-images.com
|
|
GitHub: https://github.com/MattWilcox/Adaptive-Images
|
|
Twitter: @responsiveimg
|
|
|
|
LEGAL:
|
|
Adaptive Images by Matt Wilcox is licensed under a Creative Commons Attribution 3.0 Unported License.
|
|
|
|
/* CONFIG ----------------------------------------------------------------------------------------------------------- */
|
|
|
|
$resolutions = array(1382, 992, 768, 480); // the resolution break-points to use (screen widths, in pixels)
|
|
$cache_path = "ai-cache"; // where to store the generated re-sized images. Specify from your document root!
|
|
$jpg_quality = 85; // the quality of any generated JPGs on a scale of 0 to 100
|
|
$sharpen = TRUE; // Shrinking images can blur details, perform a sharpen on re-scaled images?
|
|
$watch_cache = TRUE; // check that the adapted image isn't stale (ensures updated source images are re-cached)
|
|
$browser_cache = 60*60*24*7; // How long the BROWSER cache should last (seconds, minutes, hours, days. 7days by default)
|
|
|
|
/* END CONFIG ----------------------------------------------------------------------------------------------------------
|
|
------------------------ Don't edit anything after this line unless you know what you're doing -------------------------
|
|
--------------------------------------------------------------------------------------------------------------------- */
|
|
|
|
/* get all of the required data from the HTTP request */
|
|
$document_root = $_SERVER['DOCUMENT_ROOT'];
|
|
$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
|
|
$requested_file = basename($requested_uri);
|
|
$source_file = $document_root.$requested_uri;
|
|
$resolution = TRUE;
|
|
|
|
/* Mobile detection
|
|
NOTE: only used in the event a cookie isn't available. */
|
|
function is_mobile() {
|
|
$userAgent = strtolower($_SERVER['HTTP_USER_AGENT']);
|
|
return strpos($userAgent, 'mobile');
|
|
}
|
|
|
|
/* Does the UA string indicate this is a mobile? */
|
|
if(!is_mobile()){
|
|
$is_mobile = FALSE;
|
|
} else {
|
|
$is_mobile = TRUE;
|
|
}
|
|
|
|
// does the $cache_path directory exist already?
|
|
if (!is_dir("$document_root/$cache_path")) { // no
|
|
if (!mkdir("$document_root/$cache_path", 0755, true)) { // so make it
|
|
if (!is_dir("$document_root/$cache_path")) { // check again to protect against race conditions
|
|
// uh-oh, failed to make that directory
|
|
sendErrorImage("Failed to create cache directory at: $document_root/$cache_path");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* helper function: Send headers and returns an image. */
|
|
function sendImage($filename, $browser_cache) {
|
|
$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
|
|
if (in_array($extension, array('png', 'gif', 'jpeg'))) {
|
|
header("Content-Type: image/".$extension);
|
|
} else {
|
|
header("Content-Type: image/jpeg");
|
|
}
|
|
header("Cache-Control: private, max-age=".$browser_cache);
|
|
header('Expires: '.gmdate('D, d M Y H:i:s', time()+$browser_cache).' GMT');
|
|
header('Content-Length: '.filesize($filename));
|
|
readfile($filename);
|
|
exit();
|
|
}
|
|
|
|
/* helper function: Create and send an image with an error message. */
|
|
function sendErrorImage($message) {
|
|
/* get all of the required data from the HTTP request */
|
|
$document_root = $_SERVER['DOCUMENT_ROOT'];
|
|
$requested_uri = parse_url(urldecode($_SERVER['REQUEST_URI']), PHP_URL_PATH);
|
|
$requested_file = basename($requested_uri);
|
|
$source_file = $document_root.$requested_uri;
|
|
|
|
if(!is_mobile()){
|
|
$is_mobile = "FALSE";
|
|
} else {
|
|
$is_mobile = "TRUE";
|
|
}
|
|
|
|
$im = ImageCreateTrueColor(800, 300);
|
|
$text_color = ImageColorAllocate($im, 233, 14, 91);
|
|
$message_color = ImageColorAllocate($im, 91, 112, 233);
|
|
|
|
ImageString($im, 5, 5, 5, "Adaptive Images encountered a problem:", $text_color);
|
|
ImageString($im, 3, 5, 25, $message, $message_color);
|
|
|
|
ImageString($im, 5, 5, 85, "Potentially useful information:", $text_color);
|
|
ImageString($im, 3, 5, 105, "DOCUMENT ROOT IS: $document_root", $text_color);
|
|
ImageString($im, 3, 5, 125, "REQUESTED URI WAS: $requested_uri", $text_color);
|
|
ImageString($im, 3, 5, 145, "REQUESTED FILE WAS: $requested_file", $text_color);
|
|
ImageString($im, 3, 5, 165, "SOURCE FILE IS: $source_file", $text_color);
|
|
ImageString($im, 3, 5, 185, "DEVICE IS MOBILE? $is_mobile", $text_color);
|
|
|
|
header("Cache-Control: no-store");
|
|
header('Expires: '.gmdate('D, d M Y H:i:s', time()-1000).' GMT');
|
|
header('Content-Type: image/jpeg');
|
|
ImageJpeg($im);
|
|
ImageDestroy($im);
|
|
exit();
|
|
}
|
|
|
|
/* sharpen images function */
|
|
function findSharp($intOrig, $intFinal) {
|
|
$intFinal = $intFinal * (750.0 / $intOrig);
|
|
$intA = 52;
|
|
$intB = -0.27810650887573124;
|
|
$intC = .00047337278106508946;
|
|
$intRes = $intA + $intB * $intFinal + $intC * $intFinal * $intFinal;
|
|
return max(round($intRes), 0);
|
|
}
|
|
|
|
/* refreshes the cached image if it's outdated */
|
|
function refreshCache($source_file, $cache_file, $resolution) {
|
|
if (file_exists($cache_file)) {
|
|
// not modified
|
|
if (filemtime($cache_file) >= filemtime($source_file)) {
|
|
return $cache_file;
|
|
}
|
|
|
|
// modified, clear it
|
|
unlink($cache_file);
|
|
}
|
|
return generateImage($source_file, $cache_file, $resolution);
|
|
}
|
|
|
|
/* generates the given cache file for the given source file with the given resolution */
|
|
function generateImage($source_file, $cache_file, $resolution) {
|
|
global $sharpen, $jpg_quality;
|
|
|
|
$extension = strtolower(pathinfo($source_file, PATHINFO_EXTENSION));
|
|
|
|
// Check the image dimensions
|
|
$dimensions = GetImageSize($source_file);
|
|
$width = $dimensions[0];
|
|
$height = $dimensions[1];
|
|
|
|
// Do we need to downscale the image?
|
|
if ($width <= $resolution) { // no, because the width of the source image is already less than the client width
|
|
return $source_file;
|
|
}
|
|
|
|
// We need to resize the source image to the width of the resolution breakpoint we're working with
|
|
$ratio = $height/$width;
|
|
$new_width = $resolution;
|
|
$new_height = ceil($new_width * $ratio);
|
|
$dst = ImageCreateTrueColor($new_width, $new_height); // re-sized image
|
|
|
|
switch ($extension) {
|
|
case 'png':
|
|
$src = @ImageCreateFromPng($source_file); // original image
|
|
break;
|
|
case 'gif':
|
|
$src = @ImageCreateFromGif($source_file); // original image
|
|
break;
|
|
default:
|
|
$src = @ImageCreateFromJpeg($source_file); // original image
|
|
ImageInterlace($dst, true); // Enable interlancing (progressive JPG, smaller size file)
|
|
break;
|
|
}
|
|
|
|
if($extension=='png'){
|
|
imagealphablending($dst, false);
|
|
imagesavealpha($dst,true);
|
|
$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
|
|
imagefilledrectangle($dst, 0, 0, $new_width, $new_height, $transparent);
|
|
}
|
|
|
|
ImageCopyResampled($dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height); // do the resize in memory
|
|
ImageDestroy($src);
|
|
|
|
// sharpen the image?
|
|
// NOTE: requires PHP compiled with the bundled version of GD (see http://php.net/manual/en/function.imageconvolution.php)
|
|
if($sharpen == TRUE && function_exists('imageconvolution')) {
|
|
$intSharpness = findSharp($width, $new_width);
|
|
$arrMatrix = array(
|
|
array(-1, -2, -1),
|
|
array(-2, $intSharpness + 12, -2),
|
|
array(-1, -2, -1)
|
|
);
|
|
imageconvolution($dst, $arrMatrix, $intSharpness, 0);
|
|
}
|
|
|
|
$cache_dir = dirname($cache_file);
|
|
|
|
// does the directory exist already?
|
|
if (!is_dir($cache_dir)) {
|
|
if (!mkdir($cache_dir, 0755, true)) {
|
|
// check again if it really doesn't exist to protect against race conditions
|
|
if (!is_dir($cache_dir)) {
|
|
// uh-oh, failed to make that directory
|
|
ImageDestroy($dst);
|
|
sendErrorImage("Failed to create cache directory: $cache_dir");
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!is_writable($cache_dir)) {
|
|
sendErrorImage("The cache directory is not writable: $cache_dir");
|
|
}
|
|
|
|
// save the new file in the appropriate path, and send a version to the browser
|
|
switch ($extension) {
|
|
case 'png':
|
|
$gotSaved = ImagePng($dst, $cache_file);
|
|
break;
|
|
case 'gif':
|
|
$gotSaved = ImageGif($dst, $cache_file);
|
|
break;
|
|
default:
|
|
$gotSaved = ImageJpeg($dst, $cache_file, $jpg_quality);
|
|
break;
|
|
}
|
|
ImageDestroy($dst);
|
|
|
|
if (!$gotSaved && !file_exists($cache_file)) {
|
|
sendErrorImage("Failed to create image: $cache_file");
|
|
}
|
|
|
|
return $cache_file;
|
|
}
|
|
|
|
// check if the file exists at all
|
|
if (!file_exists($source_file)) {
|
|
header("Status: 404 Not Found");
|
|
exit();
|
|
}
|
|
|
|
/* check that PHP has the GD library available to use for image re-sizing */
|
|
if (!extension_loaded('gd')) { // it's not loaded
|
|
if (!function_exists('dl') || !dl('gd.so')) { // and we can't load it either
|
|
// no GD available, so deliver the image straight up
|
|
trigger_error('You must enable the GD extension to make use of Adaptive Images', E_USER_WARNING);
|
|
sendImage($source_file, $browser_cache);
|
|
}
|
|
}
|
|
|
|
/* Check to see if a valid cookie exists */
|
|
if (isset($_COOKIE['resolution'])) {
|
|
$cookie_value = $_COOKIE['resolution'];
|
|
|
|
// does the cookie look valid? [whole number, comma, potential floating number]
|
|
if (! preg_match("/^[0-9]+[,]*[0-9\.]+$/", "$cookie_value")) { // no it doesn't look valid
|
|
setcookie("resolution", "$cookie_value", time()-100); // delete the mangled cookie
|
|
}
|
|
else { // the cookie is valid, do stuff with it
|
|
$cookie_data = explode(",", $_COOKIE['resolution']);
|
|
$client_width = (int) $cookie_data[0]; // the base resolution (CSS pixels)
|
|
$total_width = $client_width;
|
|
$pixel_density = 1; // set a default, used for non-retina style JS snippet
|
|
if (@$cookie_data[1]) { // the device's pixel density factor (physical pixels per CSS pixel)
|
|
$pixel_density = $cookie_data[1];
|
|
}
|
|
|
|
rsort($resolutions); // make sure the supplied break-points are in reverse size order
|
|
$resolution = $resolutions[0]; // by default use the largest supported break-point
|
|
|
|
// if pixel density is not 1, then we need to be smart about adapting and fitting into the defined breakpoints
|
|
if($pixel_density != 1) {
|
|
$total_width = $client_width * $pixel_density; // required physical pixel width of the image
|
|
|
|
// the required image width is bigger than any existing value in $resolutions
|
|
if($total_width > $resolutions[0]){
|
|
// firstly, fit the CSS size into a break point ignoring the multiplier
|
|
foreach ($resolutions as $break_point) { // filter down
|
|
if ($total_width <= $break_point) {
|
|
$resolution = $break_point;
|
|
}
|
|
}
|
|
// now apply the multiplier
|
|
$resolution = $resolution * $pixel_density;
|
|
}
|
|
// the required image fits into the existing breakpoints in $resolutions
|
|
else {
|
|
foreach ($resolutions as $break_point) { // filter down
|
|
if ($total_width <= $break_point) {
|
|
$resolution = $break_point;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else { // pixel density is 1, just fit it into one of the breakpoints
|
|
foreach ($resolutions as $break_point) { // filter down
|
|
if ($total_width <= $break_point) {
|
|
$resolution = $break_point;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No resolution was found (no cookie or invalid cookie) */
|
|
if (!$resolution) {
|
|
// We send the lowest resolution for mobile-first approach, and highest otherwise
|
|
$resolution = $is_mobile ? min($resolutions) : max($resolutions);
|
|
}
|
|
|
|
/* if the requested URL starts with a slash, remove the slash */
|
|
if(substr($requested_uri, 0,1) == "/") {
|
|
$requested_uri = substr($requested_uri, 1);
|
|
}
|
|
|
|
/* whew might the cache file be? */
|
|
$cache_file = $document_root."/$cache_path/$resolution/".$requested_uri;
|
|
|
|
/* Use the resolution value as a path variable and check to see if an image of the same name exists at that path */
|
|
if (file_exists($cache_file)) { // it exists cached at that size
|
|
if ($watch_cache) { // if cache watching is enabled, compare cache and source modified dates to ensure the cache isn't stale
|
|
$cache_file = refreshCache($source_file, $cache_file, $resolution);
|
|
}
|
|
|
|
sendImage($cache_file, $browser_cache);
|
|
}
|
|
|
|
/* It exists as a source file, and it doesn't exist cached - lets make one: */
|
|
$file = generateImage($source_file, $cache_file, $resolution);
|
|
sendImage($file, $browser_cache); |