Subversion-Projekte lars-tiefland.php_share

Revision

Details | Letzte Änderung | Log anzeigen | RSS feed

Revision Autor Zeilennr. Zeile
1 lars 1 
<?php
2 
 
3 
/**
4 
*   Checks if two images contain the same image, pixel by pixel
5 
*
6 
*   @param mixed $file1    Filename for picture 1 OR gd image resource
7 
*   @param mixed $file1    Filename for picture 2 OR gd iamge resource
8 
*   @return boolean true if they are the same, false if not
9 
*/
10 
function imageisthesame($file1, $file2)
11 
{
12 
    //echo $file1 . ' - ' . $file2 . "\n";
13 
    if (is_string($file1)) {
14 
        if (!file_exists($file1)) {
15 
            throw new Exception('File 1 does not exist' . $file1);
16 
        }
17 
 
18 
        $i1 = imagecreatefromstring(file_get_contents($file1));
19 
        if ($i1 === false) {
20 
            throw new Exception('Image 1 could no be opened' . $file1);
21 
        }
22 
    } else {
23 
        $i1 = $file1;
24 
    }
25 
 
26 
    if (is_string($file2)) {
27 
        if (!file_exists($file2)) {
28 
            throw new Exception('File 2 does not exist' . $file2);
29 
        }
30 
 
31 
        $i2 = imagecreatefromstring(file_get_contents($file2));
32 
        if ($i2 === false) {
33 
            throw new Exception('Image 2 could no be opened' . $file2);
34 
        }
35 
    } else {
36 
        $i2 = $file2;
37 
    }
38 
 
39 
    $sx1 = imagesx($i1);
40 
    $sy1 = imagesy($i1);
41 
    if ($sx1 != imagesx($i2) || $sy1 != imagesy($i2)) {
42 
        //image size does not match
43 
        return false;
44 
    }
45 
 
46 
 
47 
    for ($x = 0; $x < $sx1; $x++) {
48 
    for ($y = 0; $y < $sy1; $y++) {
49 
 
50 
        $rgb1 = imagecolorat($i1, $x, $y);
51 
        $pix1 = array(
52 
            'r' => ($rgb1 >> 16) & 0xFF,
53 
            'g' => ($rgb1 >> 8) & 0xFF,
54 
            'b' =>  $rgb1 & 0xFF
55 
        );
56 
        $pix1 = imagecolorsforindex($i1, $rgb1);
57 
 
58 
        $rgb2 = imagecolorat($i2, $x, $y);
59 
        $pix2 = array(
60 
            'r' => ($rgb2 >> 16) & 0xFF,
61 
            'g' => ($rgb2 >> 8) & 0xFF,
62 
            'b' =>  $rgb2 & 0xFF
63 
        );
64 
        $pix2 = imagecolorsforindex($i2, $rgb2);
65 
 
66 
//echo implode(',',$pix1) . ' - ' . implode(',',$pix2) . "\n";
67 
        if ($pix1 != $pix2) {
68 
            return false;
69 
        }
70 
 
71 
    }
72 
    }
73 
 
74 
    return true;
75 
}//function imageisthesame($file1, $file2)
76 
 
77 
?>