setGD(imagecreatefromgif($filename)); break; case 2: $this->setGD(imagecreatefromjpeg($filename)); break; case 3: $this->setGD(imagecreatefrompng($filename)); break; } } parent::__construct(); } protected function setGD($gd) { $this->gd = $gd; $this->width = imagesx($gd); $this->height = imagesy($gd); } /** * Set the image quality, used when saving JPEGs. */ function setQuality($quality) { $this->quality = $quality; } /** * Resize an image to cover the given width/height completely, and crop off any overhanging edges. */ function croppedResize($width, $height) { if(!$this->gd) return; $width = round($width); $height = round($height); $newGD = imagecreatetruecolor($width, $height); // Preserves transparency between images imagealphablending($newGD, false); imagesavealpha($newGD, true); $destAR = $width / $height; if ($this->width > 0 && $this->height > 0 ){ // We can't divide by zero theres something wrong. $srcAR = $this->width / $this->height; // Destination narrower than the source if($destAR < $srcAR) { $srcY = 0; $srcHeight = $this->height; $srcWidth = $this->height * $destAR; $srcX = ($this->width - $srcWidth) / 2; // Destination shorter than the source } else { $srcX = 0; $srcWidth = $this->width; $srcHeight = $this->width / $destAR; $srcY = ($this->height - $srcHeight) / 2; } imagecopyresampled($newGD, $this->gd, 0,0, $srcX, $srcY, $width, $height, $srcWidth, $srcHeight); } $output = new GD(); $output->setGD($newGD); return $output; } /** * Resizes the image to fit within the given region. * Behaves similarly to paddedResize but without the padding. * @todo This method isn't very efficent */ function fittedResize($width, $height) { $gd = $this->resizeByHeight($height); if($gd->width > $width) $gd = $gd->resizeByWidth($width); return $gd; } function hasGD() { return $this->gd ? true : false; } /** * Resize an image, skewing it as necessary. */ function resize($width, $height) { if(!$this->gd) return; $width = round($width); $height = round($height); if(!$width && !$height) user_error("No dimensions given", E_USER_ERROR); if(!$width) user_error("Width not given", E_USER_ERROR); if(!$height) user_error("Height not given", E_USER_ERROR); $newGD = imagecreatetruecolor($width, $height); // Preserves transparency between images imagealphablending($newGD, false); imagesavealpha($newGD, true); imagecopyresampled($newGD, $this->gd, 0,0, 0, 0, $width, $height, $this->width, $this->height); $output = new GD(); $output->setGD($newGD); return $output; } /** * Resize an image by width. Preserves aspect ratio. */ function resizeByWidth( $width ) { $heightScale = $width / $this->width; return $this->resize( $width, $heightScale * $this->height ); } /** * Resize an image by height. Preserves aspect ratio */ function resizeByHeight( $height ) { $scale = $height / $this->height; return $this->resize( $scale * $this->width, $height ); } /** * Resize the image by preserving aspect ratio. By default, it will keep the image inside the maxWidth and maxHeight * Passing useAsMinimum will make the smaller dimension equal to the maximum corresponding dimension */ function resizeRatio( $maxWidth, $maxHeight, $useAsMinimum = false ) { $widthRatio = $maxWidth / $this->width; $heightRatio = $maxHeight / $this->height; if( $widthRatio < $heightRatio ) return $useAsMinimum ? $this->resizeByHeight( $maxHeight ) : $this->resizeByWidth( $maxWidth ); else return $useAsMinimum ? $this->resizeByWidth( $maxWidth ) : $this->resizeByHeight( $maxHeight ); } static function color_web2gd($image, $webColor) { if(substr($webColor,0,1) == "#") $webColor = substr($webColor,1); $r = hexdec(substr($webColor,0,2)); $g = hexdec(substr($webColor,2,2)); $b = hexdec(substr($webColor,4,2)); return imagecolorallocate($image, $r, $g, $b); } /** * Resize to fit fully within the given box, without resizing. Extra space left around * the image will be padded with the background color. * @param width * @param height * @param backgroundColour */ function paddedResize($width, $height, $backgroundColor = "FFFFFF") { if(!$this->gd) return; $width = round($width); $height = round($height); $newGD = imagecreatetruecolor($width, $height); // Preserves transparency between images imagealphablending($newGD, false); imagesavealpha($newGD, true); $bg = GD::color_web2gd($newGD, $backgroundColor); imagefilledrectangle($newGD, 0, 0, $width, $height, $bg); $destAR = $width / $height; if ($this->width > 0 && $this->height > 0) { // We can't divide by zero theres something wrong. $srcAR = $this->width / $this->height; // Destination narrower than the source if($destAR > $srcAR) { $destY = 0; $destHeight = $height; $destWidth = $height * $srcAR; $destX = ($width - $destWidth) / 2; // Destination shorter than the source } else { $destX = 0; $destWidth = $width; $destHeight = $width / $srcAR; $destY = ($height - $destHeight) / 2; } imagecopyresampled($newGD, $this->gd, $destX, $destY, 0, 0, $destWidth, $destHeight, $this->width, $this->height); } $output = new GD(); $output->setGD($newGD); return $output; } /** * Make the image greyscale * $rv = red value, defaults to 38 * $gv = green value, defaults to 36 * $bv = blue value, defaults to 26 * Based (more or less entirely, with changes for readability) on code from http://www.teckis.com/scriptix/thumbnails/teck.html */ function greyscale($rv=38, $gv=36, $bv=26) { $width = $this->width; $height = $this->height; $newGD = imagecreatetruecolor($this->width, $this->height); $rt = $rv + $bv + $gv; $rr = ($rv == 0) ? 0 : 1/($rt/$rv); $br = ($bv == 0) ? 0 : 1/($rt/$bv); $gr = ($gv == 0) ? 0 : 1/($rt/$gv); for($dy = 0; $dy <= $height; $dy++) { for($dx = 0; $dx <= $width; $dx++) { $pxrgb = imagecolorat($this->gd, $dx, $dy); $heightgb = ImageColorsforIndex($this->gd, $pxrgb); $newcol = ($rr*$heightgb['red']) + ($br*$heightgb['blue']) + ($gr*$heightgb['green']); $setcol = ImageColorAllocate($newGD, $newcol, $newcol, $newcol); imagesetpixel($newGD, $dx, $dy, $setcol); } } // imagecopyresampled($newGD, $this->gd, 0,0, $srcX, $srcY, $width, $height, $srcWidth, $srcHeight); $output = new GD(); $output->setGD($newGD); if($this->quality) $output->setQuality($this->quality); return $output; } function makeDir($dirname) { if(!file_exists(dirname($dirname))) $this->makeDir(dirname($dirname)); if(!file_exists($dirname)) mkdir($dirname, 02775); } function writeTo($filename) { $this->makeDir(dirname($filename)); if($filename) { if(file_exists($filename)) list($width, $height, $type, $attr) = getimagesize($filename); if(file_exists($filename)) unlink($filename); $ext = strtolower(substr($filename, strrpos($filename,'.')+1)); if(!isset($type)) switch($ext) { case "gif": $type = 1; break; case "jpeg": case "jpg": case "jpe": $type = 2; break; default: $type = 3; break; } // if the extension does not exist, the file will not be created! switch($type) { case 1: imagegif($this->gd, $filename); break; case 2: imagejpeg($this->gd, $filename, $this->quality); break; // case 3, and everything else default: // Save them as 8-bit images // imagetruecolortopalette($this->gd, false, 256); imagepng($this->gd, $filename); break; } if(file_exists($filename)) @chmod($filename,0664); } } } ?>