image handler2 SEO optimisation

[dajiaoyazi]

if (($pref_width !== '') && ($pref_height != '')) {
// different factors for width and height
$hscale = intval($pref_width) / 100;
$vscale = intval($pref_height) / 100;
} else {
// one of the the preferred values has the scaling factor
$hscale = intval($pref_width . $pref_height) / 100;
$vscale = $hscale;
}
$newwidth = floor($width * $hscale);
$newheight = floor($height * $vscale);
} else {
$this->force_canvas = (strrpos($pref_width . $pref_height, '!') !== false);
// failsafe for old zen-cart configuration one image dimension set to 0
$pref_width = ($pref_width == '' || intval($pref_width) == 0) ? 0 : intval($pref_width);
$pref_height = ($pref_height == '' || intval($pref_height) == 0) ? 0 : intval($pref_height);
if ((!$this->force_canvas) && ($pref_width != 0) && ($pref_height != 0)) {
// if no '!' is appended to dimensions we don't force the canvas size to
// match the preferred size. the image will not have the exact specified size.
// (we're in fact forcing the old 0-dimension zen-magic trick)
$oldratio = $width / $height;
$pref_ratio = $pref_width / $pref_height;
if ($pref_ratio > $oldratio) {
$pref_width = 0;
} else {
$pref_height = 0;
}
}

// now deal with the calculated preferred sizes
if (($pref_width == 0) && ($pref_height > 0)) {
// image dimensions are calculated to fit the preferred height
$pref_width = floor($width * ($pref_height / $height));
} elseif (($pref_width > 0) && ($pref_height == 0)) {
// image dimensions are calculated to fit the preferred width
$pref_height = floor($height * ($pref_width / $width));
}
if ((($pref_width > 0) && ($pref_height > 0))
&& (($pref_width < $width ) || ($pref_height < $height))) {
// only calculate new dimensions if we have sane values
$newwidth = $pref_width;
$newheight = $pref_height;
}
}
}
$resize = (($newwidth != $width) || ($newheight != $height));
return array($newwidth, $newheight, $resize);
}

function resize_imageIM($file_ext, $dest_name, $bg, $quality = 85) {
global $ihConf;
global $messageStack;
//echo 'im_convert: ' . $ihConf['im_convert'] . '<br />';
// check if convert is configured
if(!$ihConf['im_convert']) return false;
//echo 'Trying to use ImageMagick.<br />';
$size = $this->canvas['width'] . 'x' . $this->canvas['height'];
//echo $size . '<br />';
$bg = trim($bg);
$bg = ($bg == '') ? $ihConf['default']['bg'] : $bg;
$transparent = (strpos($bg, 'transparent') !== false);
$transparent &= preg_match('/(\.gif)|(\.png)/i', $file_ext);
$color = $this->get_background_rgb($bg);
if ($color) {
$bg = 'rgb(' . $color['r'] . ',' . $color['g'] . ',' . $color['b'] . ')';
$bg .= $transparent ? ' transparent' : '';
}
$gif_treatment = false;
if ($transparent && ($file_ext == ".gif")) {
// Special treatment for gif files
$bg = trim(ereg_replace('transparent', '', $bg));
$bg = ($bg != '') ? $bg : 'rgb(255,255,255)';
$temp_name = substr($dest_name, 0, strrpos($dest_name, '.')) . '-gif_treatment.png';
$gif_treatment = true;
} else {
$bg = (strpos($bg, 'transparent') === false) ? $bg : 'transparent';
}

// still no background? default to transparent
$bg = ($bg != '') ? $bg : 'transparent';
$command = $ihConf['im_convert'] . " -size $size ";
$command .= "xc:none -fill " . ($gif_treatment ? "transparent" : "\"$bg\"") . " -draw 'color 0,0 reset'";
$size .= $this->force_canvas ? '' : '!';
$command .= ' "' . $this->filename . '" -compose Over -gravity Center -geometry ' . $size . ' -composite';
$command .= ($this->watermark['file'] != '') ? ' "' . $this->watermark['file'] . '" -compose Over -gravity ' . $ihConf['watermark']['gravity'] . " -composite" : '';
$command .= ($this->zoom['file'] != '') ? ' "' . $this->zoom['file'] . '" -compose Over -gravity ' . $ihConf['zoom']['gravity'] . " -composite " : ' ';
$command .= $gif_treatment ? $temp_name : (preg_match("/\.jp(e)?g/i", $file_ext) ? "-quality $quality " : '') . "\"$dest_name\"";
@exec($command . ' 2>&1', $message, $retval);
if ($gif_treatment) {
if ($retval != 0) return false;
$command = $ihConf['im_convert'] . " -size $size ";
$command .= "xc:none -fill \"$bg\" -draw 'color 0,0 reset'";
$command .= " \"$temp_name\" -compose Over -gravity Center -geometry $size -composite";
$command .= " \"$temp_name\" -channel Alpha -threshold " . $ihConf['trans_threshold'] . " -compose CopyOpacity -gravity Center -geometry $size -composite";
$command .= " \"$dest_name\"";
@exec($command . ' 2>&1', $message, $retval);
}
if ($retval == 0) return true;

return false;
}

function alphablend($background, $overlay, $threshold = -1) {
/* -------------------------------------------------------------------- */
/* Simple cases we want to handle fast. */
/* -------------------------------------------------------------------- */
if ($overlay['alpha'] == 0) return $overlay;
if ($overlay['alpha'] == 127) return $background;
if (($background['alpha'] == 127) && ($threshold == -1)) return $overlay;

/* -------------------------------------------------------------------- */
/* What will the overlay and background alphas be? Note that */
/* the background weighting is substantially reduced as the */
/* overlay becomes quite opaque. */
/* -------------------------------------------------------------------- */
$alpha = $overlay['alpha'] * $background['alpha'] / 127;
if (($threshold > -1) && ($alpha <= $threshold)) {
$background['alpha'] = 0;
$alpha = 0;
}

$overlay_weight = 127 - $overlay['alpha'];
$background_weight = (127 - $background['alpha']) * $overlay['alpha'] / 127;
$total_weight = $overlay_weight + $background_weight;

$red = (($overlay['red'] * $overlay_weight) + ($background['red'] * $background_weight)) / $total_weight;
$green = (($overlay['green'] * $overlay_weight) + ($background['green'] * $background_weight)) / $total_weight;
$blue = (($overlay['blue'] * $overlay_weight) + ($background['blue'] * $background_weight)) / $total_weight;

return array('alpha'=>$alpha, 'red'=>$red, 'green'=>$green, 'blue'=>$blue);
}

function imagemergealpha($background, $overlay, $startwidth, $startheight, $newwidth, $newheight, $threshold = '', $background_override = '', $debug = false) {
global $ihConf;

//restore the transparency
if ($ihConf['gdlib']>1){
imagealphablending($background, false);
}

$threshold = ($threshold != '') ? intval(127 * intval($threshold) / 100) : -1;

for($x=0; $x<$newwidth; $x++) {
for($y=0; $y<$newheight; $y++) {
$c = imagecolorat($background, $x + $startwidth, $y + $startheight);
$background_color = imagecolorsforindex($background, $c);
//if ($debug) echo "($x/$y): " . $background_color['alpha'] . ':' . $background_color['red'] . ':' . $background_color['green'] . ':' . $background_color['blue'] . ' ++ ';
$c = imagecolorat($overlay, $x, $y);
$overlay_color = imagecolorsforindex($overlay, $c);
//if ($debug) echo $overlay_color['alpha'] . ':' . $overlay_color['red'] . ':' . $overlay_color['green'] . ':' . $overlay_color['blue'] . ' ==&gt; ';
$color = $this->alphablend($background_color, $overlay_color, $threshold);
//if ($debug) echo $color['alpha'] . ':' . $color['red'] . ':' . $color['green'] . ':' . $color['blue'] . '<br />';
//if ($threshold > -1) $color['alpha'] = ($color['alpha'] > $threshold) ? 127 : 0;


if (($threshold > -1) && ($color['alpha'] > $threshold)) {
$color = $background_override;
} else {
$color = imagecolorallocatealpha($background, $color['red'], $color['green'], $color['blue'], $color['alpha']);
}
imagesetpixel($background, $x + $startwidth, $y + $startheight, $color);
}
}
return $background;
}


function resize_imageGD($file_ext, $dest_name, $bg, $quality = 85) {
global $ihConf;
global $messageStack;

if($ihConf['gdlib'] < 1) return false; //no GDlib available or wanted
$srcimage = $this->load_imageGD($this->filename);
if (!$srcimage) return false; // couldn't load image
$src_ext = substr($this->filename, strrpos($this->filename, '.'));
$srcwidth = imagesx($srcimage);
$srcheight = imagesy($srcimage);
if ($this->force_canvas) {
if (($srcwidth / $this->canvas['width']) > ($srcheight / $this->canvas['height'])) {
$newwidth = $this->canvas['width'];
$newheight = floor(($newwidth / $srcwidth) * $srcheight);
} else {
$newheight = $this->canvas['height'];
$newwidth = floor(($newheight / $srcheight) * $srcwidth);
}
} else {
$newwidth = $this->canvas['width'];
$newheight = $this->canvas['height'];
}
$startwidth = (($this->canvas['width'] - $newwidth)/2);
$startheight = (($this->canvas['height'] - $newheight)/2);

if(($ihConf['gdlib']>1) && function_exists("imagecreatetruecolor")){
$tmpimg = @imagecreatetruecolor ($newwidth, $newheight);
}
if(!$tmpimg) $tmpimg = @imagecreate($newwidth, $newheight);
if(!$tmpimg) return false;

//keep alpha channel if possible
if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagealphablending($tmpimg, false);
}
//try resampling first
if(function_exists("imagecopyresampled")){
if(!@imagecopyresampled($tmpimg, $srcimage, 0, 0, 0, 0, $newwidth, $newheight, $srcwidth, $srcheight)) {
imagecopyresized($tmpimg, $srcimage, 0, 0, 0, 0, $newheight, $newwidth, $srcwidth, $srcheight);
}
} else {
imagecopyresized($tmpimg, $srcimage, 0, 0, 0, 0, $newwidth, $newheight, $srcwidth, $srcheight);
}

imagedestroy($srcimage);

// initialize FIRST background image (transparent canvas)
if(($ihConf['gdlib']>1) && function_exists("imagecreatetruecolor")){
$newimg = @imagecreatetruecolor ($this->canvas['width'], $this->canvas['height']);
}
if(!$newimg) $newimg = @imagecreate($this->canvas['width'], $this->canvas['height']);
if(!$newimg) return false;

if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagealphablending($newimg, false);
}
$background_color = imagecolorallocatealpha($newimg, 255, 255, 255, 127);
imagefilledrectangle($newimg, 0, 0, $this->canvas['width'] - 1, $this->canvas['height'] - 1, $background_color);

//$newimg = $this->imagemergealpha($newimg, $tmpimg, $startwidth, $startheight, $newwidth, $newheight);
imagecopy($newimg, $tmpimg, $startwidth, $startheight, 0, 0, $newwidth, $newheight);
imagedestroy($tmpimg);
$tmpimg = $newimg;


if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagealphablending($tmpimg, true);
}
// we need to watermark our images
if ($this->watermark['file'] != '') {
$this->watermark['image'] = $this->load_imageGD($this->watermark['file']);
imagecopy($tmpimg, $this->watermark['image'], $this->watermark['startx'], $this->watermark['starty'], 0, 0, $this->watermark['width'], $this->watermark['height']);
//$tmpimg = $this->imagemergealpha($tmpimg, $this->watermark['image'], $this->watermark['startx'], $this->watermark['starty'], $this->watermark['width'], $this->watermark['height']);
imagedestroy($this->watermark['image']);
}

// we need to zoom our images
if ($this->zoom['file'] != '') {
$this->zoom['image'] = $this->load_imageGD($this->zoom['file']);
//imagecopy($tmpimg, $this->zoom['image'], $this->zoom['startx'], $this->zoom['starty'], 0, 0, $this->zoom['width'], $this->zoom['height']);
$tmpimg = $this->imagemergealpha($tmpimg, $this->zoom['image'], $this->zoom['startx'], $this->zoom['starty'], $this->zoom['width'], $this->zoom['height']);
imagedestroy($this->zoom['image']);
}

// initialize REAL background image (filled canvas)
if(($ihConf['gdlib']>1) && function_exists("imagecreatetruecolor")){
$newimg = @imagecreatetruecolor ($this->canvas['width'], $this->canvas['height']);
}
if(!$newimg) $newimg = @imagecreate($this->canvas['width'], $this->canvas['height']);
if(!$newimg) return false;

if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagealphablending($newimg, false);
}

// determine background
// default to white as "background" -> better rendering on bright pages
// when downsampling to gif with just boolean transparency
$color = $this->get_background_rgb($bg);
if (!$color) {
$color = $this->get_background_rgb($ihConf['default']['bg']);
$transparent = (strpos($ihConf['default']['bg'], 'transparent') !== false);
} else {
$transparent = (strpos($bg, 'transparent') !== false);
}
$transparent &= preg_match('/(\.gif)|(\.png)/i', $file_ext);

$alpha = $transparent ? 127 : 0;
if ($color) {
$background_color = imagecolorallocatealpha($newimg, intval($color['r']), intval($color['g']), intval($color['b']), $alpha);
} else {
$background_color = imagecolorallocatealpha($newimg, 255, 255, 255, $alpha);
}
imagefilledrectangle($newimg, 0, 0, $this->canvas['width'] - 1, $this->canvas['height'] - 1, $background_color);

if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagealphablending($newimg, true);
}

if (preg_match('/\.gif/i', $file_ext)) {
if ($transparent) {
$newimg = $this->imagemergealpha($newimg, $tmpimg, 0, 0, $this->canvas['width'], $this->canvas['height'], $ihConf['trans_threshold'], $background_color);
imagecolortransparent($newimg, $background_color);
} else {
imagecopy($newimg, $tmpimg, 0, 0, 0, 0, $this->canvas['width'], $this->canvas['height']);
}
} else {
if ($transparent) {
$newimg = $this->imagemergealpha($newimg, $tmpimg, 0, 0, $this->canvas['width'], $this->canvas['height']);
} else {
imagecopy($newimg, $tmpimg, 0, 0, 0, 0, $this->canvas['width'], $this->canvas['height']);
}
}
imagedestroy($tmpimg);

if ($ihConf['gdlib']>1 && function_exists('imagesavealpha')){
imagesavealpha($newimg, true);
}

if (preg_match('/\.gif/i', $file_ext)) {
if ($ihConf['gdlib']>1 && function_exists('imagetruecolortopalette')) {
imagetruecolortopalette($newimg, true, 256);
}
}

return $this->save_imageGD($file_ext, $newimg, $dest_name, $quality);
}

function calculate_gravity($canvaswidth, $canvasheight, $overlaywidth, $overlayheight, $gravity) {
// Calculate overlay position from gravity setting. Center as default.
$startheight = (($canvasheight - $overlayheight)/2);
$startwidth = (($canvaswidth - $overlaywidth)/2);
if (strpos($gravity, 'North') !== false) {
$startheight = 0;
} elseif (strpos($gravity, 'South') !== false) {
$startheight = $canvasheight - $overlayheight;
}
if (strpos($gravity, 'West') !== false) {
$startwidth = 0;
} elseif (strpos($gravity, 'East') !== false) {
$startwidth = $canvaswidth - $overlaywidth;
}
return array($startwidth, $startheight);
}

function load_imageGD($src_name) {
// create an image of the given filetype
$file_ext = substr($src_name, strrpos($src_name, '.'));
switch (strtolower($file_ext)) {
case '.gif':
if(!function_exists("imagecreatefromgif")) return false;
$image = @imagecreatefromgif($src_name);
break;
case '.png':
if(!function_exists("imagecreatefrompng")) return false;
$image = @imagecreatefrompng($src_name);
break;
case '.jpg':
case '.jpeg':
if(!function_exists("imagecreatefromjpeg")) return false;
$image = @imagecreatefromjpeg($src_name);
break;
}
return $image;
}

function save_imageGD($file_ext, $image, $dest_name, $quality = 75) {
global $ihConf;
$dest_name=iconv("utf-8","gbk",$dest_name);
switch (strtolower($file_ext)) {
case '.gif':
if(!function_exists("imagegif")) return false;
$ok = imagegif($image, $dest_name);
break;
case '.png':
if(!function_exists("imagepng")) return false;
$quality = (int)$quality/100;
$ok = imagepng($image, $dest_name, $quality);
break;
case '.jpg':
case '.jpeg':
if(!function_exists("imagejpeg")) return false;
$ok = imagejpeg($image, $dest_name, $quality);
break;
default: $ok = false;
}
imagedestroy($image);

return $ok;
}

function get_background_rgb($bg) {
$bg = trim(ereg_replace('transparent', '', $bg));
list($red, $green, $blue)= split('[, :]', $bg);
if (preg_match('/[0-9]+/', $red.$green.$blue)) {
$red = min(intval($red), 255);
$green = min(intval($green), 255);
$blue = min(intval($blue), 255);
$color = array('r'=>$red, 'g'=>$green, 'b'=>$blue);
return $color;
} else {
return false;
}
}

function get_additional_parameters($alt, $width, $height, $parameters) {
global $ihConf;
if ($this->sizetype == 'small') {
if ($ihConf[$this->sizetype]['zoom']) {
if ($this->zoom['file'] == '' || !$ihConf[$this->sizetype]['hotzone']) {
// if no zoom image, the whole image triggers the popup
$this->zoom['startx'] = 0;
$this->zoom['starty'] = 0;
$this->zoom['width'] = $width;
$this->zoom['height'] = $height;
}
//escape possible quotes if they're not already escapped
$alt = preg_replace("/([^\\\\])'/", '$1\\\'', $alt);
$alt = str_replace('"', '&quot;', $alt);
// strip potential suffixes just to be sure
$src = $this->strip_sizetype_suffix($this->src);
// define zoom sizetype
$zoom_sizetype = ($this->sizetype=='small')?'medium':'large';
// additional zoom functionality
$products_image_directory = substr($src, strlen($ihConf['dir']['images']), strrpos($src, '/') - strlen($ihConf['dir']['images']) + 1);
$products_image_filename = substr($src, strrpos($src, '/'), strlen ($src) - strrpos ($src, '/') - strlen ($this->extension));
$products_image_zoom = $ihConf['dir']['images'] . $zoom_sizetype . '/' . $products_image_directory . $products_image_filename . $ihConf[$zoom_sizetype]['suffix'] . $this->extension;
$ih_zoom_image = new ih_image($products_image_zoom, $ihConf[$zoom_sizetype]['width'], $ihConf[$zoom_sizetype]['height']);
$products_image_zoom = $ih_zoom_image->get_local();
list($zoomwidth, $zoomheight) = @getimagesize($ihConf['dir']['docroot'] . $products_image_zoom);
// we should parse old parameters here and possibly merge some inc case they're duplicate
$parameters .= ($parameters != '') ? ' ' : '';
return $parameters . 'style="position:relative" onmouseover="showtrail(' . "'$products_image_zoom','$alt',$width,$height,$zoomwidth,$zoomheight,this," . $this->zoom['startx'].','.$this->zoom['starty'].','.$this->zoom['width'].','.$this->zoom['height'].');" onmouseout="hidetrail();" ';
}
}
}


}[/PHP]

[paddy_uk2007]

what is this all about ???