TIP: Přetáhni ikonu na hlavní panel pro připnutí webu
Tak, muzu dat i zjednodusenou verzi a pro RGB (v komentu pokus pro imagemagic, uprava +-n na +n, upvrava pokus o prepsani funkci chr; ale on chce na prepis funkci a imagemagick instalovat cosi, coz se mi nechce).
1920x1200 rgb, zpracovano za 23s, komprese gzip 40/69 = 58%
<?php
ini_set('max_execution_time', 10000); //10000s
set_time_limit(10000);
ini_set('memory_limit', '256M');
function microtime_float() //pp 17.3.2014
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$time = array();
$time[] = microtime_float();
function timePrint($time)
{
$time[] = microtime_float();
$t = array();
$t[] = round($time[count($time)-1]-$time[0],3);
for ($i=1;$i<count($time);$i++)
{
$t[] = round($time[$i]-$time[$i-1],3);
}
$t = implode(" | ",$t);
echo '<hr>Cas zpracovani '.$t.' s';
}
function transf(&$img,$w,$h)//&$imagick
{
$out = array('','','');
$c = array(0,0,0);
$tmp = array(0,0,0);
$tbl = array();
$n = 256;
$nn = $n>>1;
$m = 0;
for ($i=0,$j=-$n;$i<$n;++$i,++$j)
{
$tbl[$j] = chr($i);
$tbl[$i] = chr($i);
/*
$m = $i<$nn ? $i : $n-1-$i;
$tbl[$j] = chr($m);
$tbl[$i] = chr($m);
*/
}
ksort($tbl);
//$a = 0;
//$iterator = $imagick->getPixelIterator();
$pixel = 0;
for ($j=0;$j<$h;++$j)
{
for ($i=0;$i<$w;++$i)
{
$pixel = imagecolorat($img, $i, $j);
//return '';
$c[2] = $pixel & 0xFF;
$c[1] = ($pixel >> 8) & 0xFF;
$c[0] = ($pixel >> 16) & 0xFF;
$out[0] .= $tbl[$c[0]-$tmp[0]];
$out[1] .= $tbl[$c[1]-$tmp[1]];
$out[2] .= $tbl[$c[2]-$tmp[2]];
$tmp[0] = $c[0];
$tmp[1] = $c[1];
$tmp[2] = $c[2];
}
}
/*
for ($j=0;$j<$h;++$j)
{
for ($i=0;$i<$w;++$i)
{
$pixel = imagecolorat($img, $i, $j);
foreach($iterator as $row => $pixels)
{
foreach ($pixels as $column => $pixel)
{
var_dump($pixel);
$iterator->syncIterator();
return '';
*/
return $out[0].$out[1].$out[2];
}
/*
<?php
$imagick = new Imagick("my_image.jpeg");
$iterator = $imagick->getPixelIterator();
foreach($iterator as $row => $pixels) {
foreach ($pixels as $column => $pixel) {
// Do something with $pixel
}
$iterator->syncIterator();
}
?>
*/
$name1 = "img/jp-bwgirl.jpeg"; //
$name1 = "img/tropical-island-hut.jpg"; //
//$name1 = "img/jp-bwgirl-2.jpeg"; //
$name2 = "tmp/xxx"; //
$bool = file_exists($name1);
echo 'Soubor '.$name1.' '. ($bool ? 'existuje' : 'chyba neexistuje').'<br>';
$b = filesize($name1);
$img = imagecreatefromjpeg($name1);
$w = imagesx($img);
$h = imagesy($img);
//$imagick = new Imagick($name1);
//$w = $imagick->getImageWidth();
//$h = $imagick->getImageHeight();
//var_dump($img);
//imagexbm($img, 'simpletext.xbm');
//header('Content-Type: image/vnd.wap.wbmp');
//imagewbmp($img,$name2);
////header('Content-Type: ' . image_type_to_mime_type(IMAGETYPE_WBMP));
////image2wbmp($img);
$b = $w*$h*3;
$out = '';
$out = transf($img,$w,$h);
imagedestroy($img);
$a = 0;
$out = gzcompress($out,9);
$file2 = fopen($name2, "wb");
fwrite($file2,$out);
fclose($file2);
$a = strlen($out); unset($out);
echo '<br>out / in = floor(10000*$a/$b)/100 % gzip';
echo '<br>'.$a. ' / '. $b .' = '.(floor(10000*$a/$b)/100).'% gzip';
echo '<br>'.$w. ' x '. $h .' = '.($w * $h);
timePrint($time);
/*
class charCode
{
private $a, $b;
function __construct()
{
$this->a = array();
$this->b = array();
for($i=0;$i<256;++$i)
{
$this->a[$i] = chr($i);
$this->b[chr($i)] = $i;
}
}
function chr($code)
{return $this->b[$code];}
function ord($char)
{return $this->a[$char];}
}
$charcode = new charCode();
//rename_function('strlen', 'new_strlen');
//override_function('chr', '$code', 'return $charcode->chr($code);');
//override_function('ord', '$char', 'return $charcode->ord($char);');
runkit_function_redefine('chr', '$code', 'return $charcode->chr($code);');
runkit_function_redefine('ord', '$char', 'return $charcode->ord($char);');
*/
?>
