Codice PHP:
class Resize_Image {
var $image_to_resize;
var $new_width;
var $new_height;
var $ratio;
var $new_image_name;
var $save_folder;
function resize()
{
if(!file_exists($this->image_to_resize))
{
exit("File ".$this->image_to_resize." does not exist.");
}
$info = GetImageSize($this->image_to_resize);
if(empty($info))
{
exit("The file ".$this->image_to_resize." doesn't seem to be an image.");
}
$width = $info[0];
$height = $info[1];
$mime = $info['mime'];
/* Keep Aspect Ratio? */
if($this->ratio)
{
if($width > $this->new_width || $height > $this->new_height){
if($width > $height){
$factor = (float)$this->new_width / (float)$width;
$this->new_height = $factor * $height;
}
else
{
$factor = (float)$this->new_height / (float)$height;
$this->new_width = $factor * $width;
}
}
else
{
$this->new_width = $width ;
$this->new_height = $height;
}
}
// What sort of image?
$type = substr(strrchr($mime, '/'), 1);
function ConvertBMP2GD($src, $dest = false) {
if(!($src_f = fopen($src, "rb"))) {
return false;
}
if(!($dest_f = fopen($dest, "wb"))) {
return false;
}
$header = unpack("vtype/Vsize/v2reserved/Voffset", fread($src_f,14));
$info = unpack("Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant",fread($src_f, 40));
extract($info);
extract($header);
if($type != 0x4D42) { // signature "BM"
return false;
}
$palette_size = $offset - 54;
$ncolor = $palette_size / 4;
$gd_header = "";
// true-color vs. palette
$gd_header .= ($palette_size == 0) ? "\xFF\xFE" : "\xFF\xFF";
$gd_header .= pack("n2", $width, $height);
$gd_header .= ($palette_size == 0) ? "\x01" : "\x00";
if($palette_size) {
$gd_header .= pack("n", $ncolor);
}
// no transparency
$gd_header .= "\xFF\xFF\xFF\xFF";
fwrite($dest_f, $gd_header);
if($palette_size) {
$palette = fread($src_f, $palette_size);
$gd_palette = "";
$j = 0;
while($j < $palette_size) {
$b = $palette{$j++};
$g = $palette{$j++};
$r = $palette{$j++};
$a = $palette{$j++};
$gd_palette .= "$r$g$b$a";
}
$gd_palette .= str_repeat("\x00\x00\x00\x00", 256 - $ncolor);
fwrite($dest_f, $gd_palette);
}
$scan_line_size = (($bits * $width) + 7) >> 3;
$scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size &
0x03) : 0;
for($i = 0, $l = $height - 1; $i < $height; $i++, $l--) {
// BMP stores scan lines starting from bottom
fseek($src_f, $offset + (($scan_line_size + $scan_line_align) *
$l));
$scan_line = fread($src_f, $scan_line_size);
if($bits == 24) {
$gd_scan_line = "";
$j = 0;
while($j < $scan_line_size) {
$b = $scan_line{$j++};
$g = $scan_line{$j++};
$r = $scan_line{$j++};
$gd_scan_line .= "\x00$r$g$b";
}
}
else if($bits == 8) {
$gd_scan_line = $scan_line;
}
else if($bits == 4) {
$gd_scan_line = "";
$j = 0;
while($j < $scan_line_size) {
$byte = ord($scan_line{$j++});
$p1 = chr($byte >> 4);
$p2 = chr($byte & 0x0F);
$gd_scan_line .= "$p1$p2";
}
$gd_scan_line = substr($gd_scan_line, 0, $width);
}
else if($bits == 1)
{
$gd_scan_line = "";
$j = 0;
while($j < $scan_line_size) {
$byte = ord($scan_line{$j++});
$p1 = chr((int) (($byte & 0x80) != 0));
$p2 = chr((int) (($byte & 0x40) != 0));
$p3 = chr((int) (($byte & 0x20) != 0));
$p4 = chr((int) (($byte & 0x10) != 0));
$p5 = chr((int) (($byte & 0x08) != 0));
$p6 = chr((int) (($byte & 0x04) != 0));
$p7 = chr((int) (($byte & 0x02) != 0));
$p8 = chr((int) (($byte & 0x01) != 0));
$gd_scan_line .= "$p1$p2$p3$p4$p5$p6$p7$p8";
}
$gd_scan_line = substr($gd_scan_line, 0, $width);
}
fwrite($dest_f, $gd_scan_line);
}
fclose($src_f);
fclose($dest_f);
return true;
}
function imagecreatefrombmp($filename) {
$tmp_name = tempnam("/tmp", "GD");
if(ConvertBMP2GD($filename, $tmp_name))
{
$img = imagecreatefromgd($tmp_name);
unlink($tmp_name);
return $img;
}
return false;
}
switch ($type)
{
case 'jpeg':
case 'jpg' :
case 'JPG' :
$image_create_func = 'ImageCreateFromJPEG';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
case 'png':
$image_create_func = 'ImageCreateFromPNG';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
case 'bmp':
//$image_create_func = 'imagecreatefrombmp';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
case 'gif':
$image_create_func = 'ImageCreateFromGIF';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
case 'vnd.wap.wbmp':
$image_create_func = 'ImageCreateFromWBMP';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
case 'xbm':
$image_create_func = 'ImageCreateFromXBM';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
break;
default:
$image_create_func = 'ImageCreateFromJPEG';
$image_save_func = 'ImageJPEG';
$new_image_ext = 'jpg';
}
// New Image
$image_c = ImageCreateTrueColor($this->new_width, $this->new_height);
if($type != "bmp"){
$new_image = $image_create_func($this->image_to_resize);}
else{
$new_image = imagecreatefrombmp($this->image_to_resize);}
ImageCopyResampled($image_c, $new_image, 0, 0, 0, 0, $this->new_width, $this->new_height, $width, $height);
if($this->save_folder)
{
if($this->new_image_name)
{
$new_name = $this->new_image_name.'.'.$new_image_ext;
}
else
{
$new_name = $this->new_thumb_name(basename($this->image_to_resize)).'.'.$new_image_ext;
}
$save_path = $this->save_folder.$new_name;
}
else
{
/* Show the image without saving it to a folder */
header("Content-Type: ".$mime);
$image_save_func($image_c,60);
$save_path = '';
}
$process = $image_save_func($image_c, $save_path,60);
return array('result' => $process, 'new_file_path' => $save_path);
function new_thumb_name($filename)
{
$string = trim($filename);
$string = strtolower($string);
$string = trim(ereg_replace("[^ A-Za-z0-9_]", " ", $string));
$string = ereg_replace("[ tnr]+", "_", $string);
$string = str_replace(" ", '_', $string);
$string = ereg_replace("[ _]+", "_", $string);
return $string;
}
}
}
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