411 lines
11 KiB
PHP
411 lines
11 KiB
PHP
<?php
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/**
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* A wrapper class for GD-based images, with lots of manipulation functions.
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* @package sapphire
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* @subpackage filesystem
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*/
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class GD extends Object {
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protected $gd, $width, $height;
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protected $quality;
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protected static $default_quality = 75;
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/**
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* Set the default image quality.
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* @param quality int A number from 0 to 100, 100 being the best quality.
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*/
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static function set_default_quality($quality) {
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if(is_numeric($quality) && (int) $quality >= 0 && (int) $quality <= 100) {
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self::$default_quality = (int) $quality;
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}
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}
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function __construct($filename = null) {
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// If we're working with image resampling, things could take a while. Bump up the time-limit
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increase_time_limit_to(300);
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if($filename) {
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// We use getimagesize instead of extension checking, because sometimes extensions are wrong.
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list($width, $height, $type, $attr) = getimagesize($filename);
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switch($type) {
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case 1: if(function_exists('imagecreatefromgif')) $this->setGD(imagecreatefromgif($filename)); break;
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case 2: if(function_exists('imagecreatefromjpeg')) $this->setGD(imagecreatefromjpeg($filename)); break;
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case 3: if(function_exists('imagecreatefrompng')) $this->setGD(imagecreatefrompng($filename)); break;
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}
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}
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$this->quality = self::$default_quality;
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parent::__construct();
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}
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public function setGD($gd) {
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$this->gd = $gd;
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$this->width = imagesx($gd);
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$this->height = imagesy($gd);
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}
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public function getGD() {
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return $this->gd;
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}
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/**
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* Set the image quality, used when saving JPEGs.
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*/
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function setQuality($quality) {
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$this->quality = $quality;
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}
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/**
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* Resize an image to cover the given width/height completely, and crop off any overhanging edges.
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*/
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function croppedResize($width, $height) {
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if(!$this->gd) return;
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$width = round($width);
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$height = round($height);
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$newGD = imagecreatetruecolor($width, $height);
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// Preserves transparency between images
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imagealphablending($newGD, false);
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imagesavealpha($newGD, true);
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$destAR = $width / $height;
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if ($this->width > 0 && $this->height > 0 ){
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// We can't divide by zero theres something wrong.
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$srcAR = $this->width / $this->height;
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// Destination narrower than the source
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if($destAR < $srcAR) {
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$srcY = 0;
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$srcHeight = $this->height;
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$srcWidth = round( $this->height * $destAR );
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$srcX = round( ($this->width - $srcWidth) / 2 );
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// Destination shorter than the source
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} else {
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$srcX = 0;
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$srcWidth = $this->width;
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$srcHeight = round( $this->width / $destAR );
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$srcY = round( ($this->height - $srcHeight) / 2 );
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}
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imagecopyresampled($newGD, $this->gd, 0,0, $srcX, $srcY, $width, $height, $srcWidth, $srcHeight);
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}
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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/**
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* Resizes the image to fit within the given region.
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* Behaves similarly to paddedResize but without the padding.
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* @todo This method isn't very efficent
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*/
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function fittedResize($width, $height) {
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$gd = $this->resizeByHeight($height);
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if($gd->width > $width) $gd = $gd->resizeByWidth($width);
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return $gd;
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}
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function hasGD() {
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return $this->gd ? true : false;
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}
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/**
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* Resize an image, skewing it as necessary.
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*/
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function resize($width, $height) {
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if(!$this->gd) return;
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$width = round($width);
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$height = round($height);
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if(!$width && !$height) user_error("No dimensions given", E_USER_ERROR);
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if(!$width) user_error("Width not given", E_USER_ERROR);
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if(!$height) user_error("Height not given", E_USER_ERROR);
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$newGD = imagecreatetruecolor($width, $height);
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// Preserves transparency between images
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imagealphablending($newGD, false);
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imagesavealpha($newGD, true);
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imagecopyresampled($newGD, $this->gd, 0,0, 0, 0, $width, $height, $this->width, $this->height);
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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/**
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* Rotates image by given angle.
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*
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* @param angle
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*
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* @return GD
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*/
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function rotate($angle) {
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if(!$this->gd) return;
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if(function_exists("imagerotate")) {
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$newGD = imagerotate($this->gd, $angle,0);
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} else {
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//imagerotate is not included in PHP included in Ubuntu
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$newGD = $this->rotatePixelByPixel($angle);
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}
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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/**
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* Rotates image by given angle. It's slow because makes it pixel by pixel rather than
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* using built-in function. Used when imagerotate function is not available(i.e. Ubuntu)
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*
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* @param angle
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*
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* @return GD
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*/
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function rotatePixelByPixel($angle) {
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$sourceWidth = imagesx($this->gd);
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$sourceHeight = imagesy($this->gd);
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if ($angle == 180) {
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$destWidth = $sourceWidth;
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$destHeight = $sourceHeight;
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} else {
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$destWidth = $sourceHeight;
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$destHeight = $sourceWidth;
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}
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$rotate=imagecreatetruecolor($destWidth,$destHeight);
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imagealphablending($rotate, false);
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for ($x = 0; $x < ($sourceWidth); $x++) {
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for ($y = 0; $y < ($sourceHeight); $y++) {
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$color = imagecolorat($this->gd, $x, $y);
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switch ($angle) {
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case 90:
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imagesetpixel($rotate, $y, $destHeight - $x - 1, $color);
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break;
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case 180:
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imagesetpixel($rotate, $destWidth - $x - 1, $destHeight - $y - 1, $color);
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break;
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case 270:
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imagesetpixel($rotate, $destWidth - $y - 1, $x, $color);
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break;
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default: $rotate = $this->gd;
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};
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}
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}
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return $rotate;
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}
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/**
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* Crop's part of image.
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*
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* @param top y position of left upper corner of crop rectangle
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* @param left x position of left upper corner of crop rectangle
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* @param width rectangle width
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* @param height rectangle height
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*
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* @return GD
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*/
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function crop($top, $left, $width, $height) {
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$newGD = imagecreatetruecolor($width, $height);
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imagecopyresampled($newGD, $this->gd, 0, 0, $left, $top, $width, $height, $width, $height);
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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/**
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* Method return width of image.
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*
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* @return integer width.
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*/
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function getWidth() {
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return $this->width;
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}
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/**
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* Method return height of image.
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*
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* @return integer height
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*/
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function getHeight() {
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return $this->height;
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}
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/**
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* Resize an image by width. Preserves aspect ratio.
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*/
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function resizeByWidth( $width ) {
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$heightScale = $width / $this->width;
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return $this->resize( $width, $heightScale * $this->height );
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}
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/**
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* Resize an image by height. Preserves aspect ratio
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*/
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function resizeByHeight( $height ) {
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$scale = $height / $this->height;
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return $this->resize( $scale * $this->width, $height );
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}
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/**
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* Resize the image by preserving aspect ratio. By default, it will keep the image inside the maxWidth and maxHeight
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* Passing useAsMinimum will make the smaller dimension equal to the maximum corresponding dimension
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*/
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function resizeRatio( $maxWidth, $maxHeight, $useAsMinimum = false ) {
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$widthRatio = $maxWidth / $this->width;
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$heightRatio = $maxHeight / $this->height;
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if( $widthRatio < $heightRatio )
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return $useAsMinimum ? $this->resizeByHeight( $maxHeight ) : $this->resizeByWidth( $maxWidth );
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else
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return $useAsMinimum ? $this->resizeByWidth( $maxWidth ) : $this->resizeByHeight( $maxHeight );
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}
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static function color_web2gd($image, $webColor) {
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if(substr($webColor,0,1) == "#") $webColor = substr($webColor,1);
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$r = hexdec(substr($webColor,0,2));
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$g = hexdec(substr($webColor,2,2));
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$b = hexdec(substr($webColor,4,2));
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return imagecolorallocate($image, $r, $g, $b);
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}
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/**
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* Resize to fit fully within the given box, without resizing. Extra space left around
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* the image will be padded with the background color.
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* @param width
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* @param height
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* @param backgroundColour
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*/
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function paddedResize($width, $height, $backgroundColor = "FFFFFF") {
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if(!$this->gd) return;
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$width = round($width);
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$height = round($height);
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$newGD = imagecreatetruecolor($width, $height);
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// Preserves transparency between images
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imagealphablending($newGD, false);
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imagesavealpha($newGD, true);
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$bg = GD::color_web2gd($newGD, $backgroundColor);
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imagefilledrectangle($newGD, 0, 0, $width, $height, $bg);
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$destAR = $width / $height;
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if ($this->width > 0 && $this->height > 0) {
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// We can't divide by zero theres something wrong.
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$srcAR = $this->width / $this->height;
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// Destination narrower than the source
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if($destAR > $srcAR) {
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$destY = 0;
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$destHeight = $height;
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$destWidth = round( $height * $srcAR );
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$destX = round( ($width - $destWidth) / 2 );
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// Destination shorter than the source
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} else {
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$destX = 0;
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$destWidth = $width;
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$destHeight = round( $width / $srcAR );
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$destY = round( ($height - $destHeight) / 2 );
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}
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imagecopyresampled($newGD, $this->gd, $destX, $destY, 0, 0, $destWidth, $destHeight, $this->width, $this->height);
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}
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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/**
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* Make the image greyscale
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* $rv = red value, defaults to 38
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* $gv = green value, defaults to 36
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* $bv = blue value, defaults to 26
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* Based (more or less entirely, with changes for readability) on code from http://www.teckis.com/scriptix/thumbnails/teck.html
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*/
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function greyscale($rv=38, $gv=36, $bv=26) {
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$width = $this->width;
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$height = $this->height;
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$newGD = imagecreatetruecolor($this->width, $this->height);
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$rt = $rv + $bv + $gv;
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$rr = ($rv == 0) ? 0 : 1/($rt/$rv);
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$br = ($bv == 0) ? 0 : 1/($rt/$bv);
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$gr = ($gv == 0) ? 0 : 1/($rt/$gv);
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for($dy = 0; $dy < $height; $dy++) {
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for($dx = 0; $dx < $width; $dx++) {
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$pxrgb = imagecolorat($this->gd, $dx, $dy);
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$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
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$newcol = ($rr*$heightgb['red']) + ($br*$heightgb['blue']) + ($gr*$heightgb['green']);
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$setcol = ImageColorAllocate($newGD, $newcol, $newcol, $newcol);
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imagesetpixel($newGD, $dx, $dy, $setcol);
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}
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}
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$output = clone $this;
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$output->setGD($newGD);
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return $output;
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}
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function makeDir($dirname) {
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if(!file_exists(dirname($dirname))) $this->makeDir(dirname($dirname));
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if(!file_exists($dirname)) mkdir($dirname, Filesystem::$folder_create_mask);
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}
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function writeTo($filename) {
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$this->makeDir(dirname($filename));
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if($filename) {
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if(file_exists($filename)) list($width, $height, $type, $attr) = getimagesize($filename);
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if(file_exists($filename)) unlink($filename);
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$ext = strtolower(substr($filename, strrpos($filename,'.')+1));
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if(!isset($type)) switch($ext) {
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case "gif": $type = 1; break;
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case "jpeg": case "jpg": case "jpe": $type = 2; break;
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default: $type = 3; break;
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}
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// if the extension does not exist, the file will not be created!
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switch($type) {
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case 1: imagegif($this->gd, $filename); break;
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case 2: imagejpeg($this->gd, $filename, $this->quality); break;
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// case 3, and everything else
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default:
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// Save them as 8-bit images
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// imagetruecolortopalette($this->gd, false, 256);
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imagepng($this->gd, $filename); break;
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}
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if(file_exists($filename)) @chmod($filename,0664);
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}
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}
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}
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?>
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