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Added image type specific loading and displaying.

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Added method 'valid()' to tell if image contains a valid resource.
Renamed imageResource() to resource().
This commit is contained in:
Thomas Tanghus 2012-01-01 23:26:24 +01:00
parent 853d1730c7
commit 312e7993bb
1 changed files with 128 additions and 11 deletions
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139
lib/image.php
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@ -21,6 +21,18 @@
*
*/
/** From user comments at http://dk2.php.net/manual/en/function.exif-imagetype.php
* Don't know if it can come in handy?
if ( ! function_exists( 'exif_imagetype' ) ) {
function exif_imagetype ( $filename ) {
if ( ( list($width, $height, $type, $attr) = getimagesize( $filename ) ) !== false ) {
return $type;
}
return false;
}
}
*/
/**
* Class for image manipulation
* Ideas: imagerotate, chunk_split(base64_encode())
@ -29,6 +41,7 @@
class OC_Image {
static private $resource = false; // tmp resource.
static private $destroy = false; // if the resource is created withing the object.
static private $imagetype = IMAGETYPE_PNG; // Default to png if file type isn't evident.
/**
* @brief Constructor.
* @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function.
@ -50,26 +63,69 @@ class OC_Image {
* @brief Destructor.
*/
function __destruct() {
if(self::$resource && self::$destroy) {
if(is_resource(self::$resource) && self::$destroy) {
imagedestroy(self::$resource); // Why does this issue a warning.
}
}
/**
* @brief Determine whether the object contains an image resource.
* returns bool
* @returns bool
*/
function empty() {
if(self::$resource && self::$destroy) {
}
public function valid() { // apparently you can't name a method 'empty'...
$ret = is_resource(self::$resource);
return $ret;
}
/**
* @brief Returns the MIME type of the image or an empty string if no image is loaded.
* @returns int
*/
public function mimeType() {
return is_resource(self::$resource) ? image_type_to_mime_type(self::$imagetype) : '';
}
/**
* @brief Returns the width of the image or -1 if no image is loaded.
* @returns int
*/
public function width() {
return is_resource(self::$resource) ? imagesx(self::$resource) : -1;
}
/**
* @brief Returns the height of the image or -1 if no image is loaded.
* @returns int
*/
public function height() {
return is_resource(self::$resource) ? imagesy(self::$resource) : -1;
}
/**
* @brief Prints the image.
*/
public function show() {
header('Content-Type: image/png');
imagepng(self::$resource);
header('Content-Type: '.self::mimeType());
switch(self::$imagetype) {
case IMAGETYPE_GIF:
imagegif(self::$resource);
break;
case IMAGETYPE_JPEG:
imagepng(self::$resource);
break;
case IMAGETYPE_PNG:
imagejpeg(self::$resource);
break;
case IMAGETYPE_XBM:
imagexbm(self::$resource);
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
imagewbmp(self::$resource);
break;
default:
imagepng(self::$resource);
}
}
/**
@ -82,7 +138,7 @@ class OC_Image {
/**
* @returns Returns the image resource in any.
*/
public function imageResource() {
public function resource() {
return self::$resource;
}
@ -126,11 +182,72 @@ class OC_Image {
*/
static public function loadFromFile($imagepath=false) {
if(!is_file($imagepath) || !file_exists($imagepath) || !is_readable($imagepath)) {
OC_Log::write('core','OC_Image::loadFromFile, couldn\'t load'.$imagepath, OC_Log::DEBUG);
OC_Log::write('core','OC_Image::loadFromFile, couldn\'t load', OC_Log::DEBUG);
return false;
}
self::$resource = imagecreatefromstring(file_get_contents($imagepath));
self::$destroy = true;
$itype = exif_imagetype($imagepath);
switch($itype) {
case IMAGETYPE_GIF:
if (imagetypes() & IMG_GIF) {
self::$resource = imagecreatefromgif($imagepath);
}
break;
case IMAGETYPE_JPEG:
if (imagetypes() & IMG_JPG) {
self::$resource = imagecreatefromjpeg($imagepath);
}
break;
case IMAGETYPE_PNG:
if (imagetypes() & IMG_PNG) {
self::$resource = imagecreatefrompng($imagepath);
}
break;
case IMAGETYPE_XBM:
if (imagetypes() & IMG_XPM) {
self::$resource = imagecreatefromxbm($imagepath);
}
break;
case IMAGETYPE_WBMP:
case IMAGETYPE_BMP:
if (imagetypes() & IMG_WBMP) {
self::$resource = imagecreatefromwbmp($imagepath);
}
break;
/*
case IMAGETYPE_TIFF_II: // (intel byte order)
break;
case IMAGETYPE_TIFF_MM: // (motorola byte order)
break;
case IMAGETYPE_JPC:
break;
case IMAGETYPE_JP2:
break;
case IMAGETYPE_JPX:
break;
case IMAGETYPE_JB2:
break;
case IMAGETYPE_SWC:
break;
case IMAGETYPE_IFF:
break;
case IMAGETYPE_ICO:
break;
case IMAGETYPE_SWF:
break;
case IMAGETYPE_PSD:
break;
*/
default:
self::$resource = imagecreatefromstring(file_get_contents($imagepath));
$itype = IMAGETYPE_PNG;
OC_Log::write('core','OC_Image::loadFromFile, Default', OC_Log::DEBUG);
break;
}
// if($this->valid()) { // FIXME: I get an error: "PHP Fatal error: Using $this when not in object context..." WTF?
if(self::valid()) { // And here I get a warning: "PHP Strict Standards: Non-static method OC_Image::valid() should not be called statically..." valid() shouldn't be a static member as it would fail on a non-instantiated class.
self::$imagetype = $itype;
self::$destroy = true;
}
return self::$resource;
}