danwin1210/le-chat-php
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Use PNG format instead of GIF for captchas, to lessen artifacts.

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This commit is contained in:
Daniel Winzen
2025-08-31 17:42:46 +02:00
parent 480d7e2ba3
commit 2bd73a3785
1 changed files with 5 additions and 5 deletions
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10
chat.php
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@@ -683,7 +683,7 @@ function send_captcha(): void
$fg=imagecolorallocate($im, 255, 255, 255); $fg=imagecolorallocate($im, 255, 255, 255);
imagefill($im, 0, 0, $bg); imagefill($im, 0, 0, $bg);
imagestring($im, 5, 5, 5, $code, $fg); imagestring($im, 5, 5, 5, $code, $fg);
echo '<img alt="" width="55" height="24" src="data:image/gif;base64,'; echo '<img alt="" width="55" height="24" src="data:image/png;base64,';
}elseif($difficulty===2){ }elseif($difficulty===2){
$im=imagecreatetruecolor(55, 24); $im=imagecreatetruecolor(55, 24);
$bg=imagecolorallocate($im, 0, 0, 0); $bg=imagecolorallocate($im, 0, 0, 0);
@@ -698,7 +698,7 @@ function send_captcha(): void
for($i=0;$i<100;++$i){ for($i=0;$i<100;++$i){
imagesetpixel($im, mt_rand(0, 55), mt_rand(0, 24), $dots); imagesetpixel($im, mt_rand(0, 55), mt_rand(0, 24), $dots);
} }
echo '<img alt="" width="55" height="24" src="data:image/gif;base64,'; echo '<img alt="" width="55" height="24" src="data:image/png;base64,';
}elseif($difficulty===3){ // hard }elseif($difficulty===3){ // hard
$im=imagecreatetruecolor(55, 24); $im=imagecreatetruecolor(55, 24);
$bg=imagecolorallocatealpha($im, 0, 0, 0, 127); $bg=imagecolorallocatealpha($im, 0, 0, 0, 127);
@@ -812,7 +812,7 @@ function send_captcha(): void
$follow=imagecolorallocate($im, mt_rand(10, 255), mt_rand(10, 255), mt_rand(10, 255)); $follow=imagecolorallocate($im, mt_rand(10, 255), mt_rand(10, 255), mt_rand(10, 255));
imageline($im, $chars[$i]['x']+ $fontwidth / 2, $chars[$i]['y']+ $fontheight / 2, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, IMG_COLOR_STYLED); imageline($im, $chars[$i]['x']+ $fontwidth / 2, $chars[$i]['y']+ $fontheight / 2, $chars[$i+1]['x']+4, $chars[$i+1]['y']+8, IMG_COLOR_STYLED);
} }
echo '<img alt="CAPTCHA" width="' . $CAPTCHAWIDTH . '" height="' . $CAPTCHAHEIGHT . '" src="data:image/gif;base64,'; echo '<img alt="CAPTCHA" width="' . $CAPTCHAWIDTH . '" height="' . $CAPTCHAHEIGHT . '" src="data:image/png;base64,';
} elseif ($difficulty===5 || $difficulty===6 || $difficulty===7 || $difficulty===8){ // TrueType } elseif ($difficulty===5 || $difficulty===6 || $difficulty===7 || $difficulty===8){ // TrueType
$CAPTCHAWIDTH = 620; $CAPTCHAWIDTH = 620;
$CAPTCHAHEIGHT = 177; $CAPTCHAHEIGHT = 177;
@@ -925,10 +925,10 @@ function send_captcha(): void
} }
} }
} }
echo '<img alt="" width="' . $CAPTCHAWIDTH . '" height="' .$CAPTCHAHEIGHT . '" src="data:image/gif;base64,'; echo '<img alt="" width="' . $CAPTCHAWIDTH . '" height="' .$CAPTCHAHEIGHT . '" src="data:image/png;base64,';
} }
ob_start(); ob_start();
imagegif($im); imagepng($im);
imagedestroy($im); imagedestroy($im);
echo base64_encode(ob_get_clean()).'">'; echo base64_encode(ob_get_clean()).'">';
echo '</td></tr><tr><td>'.hidden('challenge', $randid).'<input type="text" name="captcha" size="15" autocomplete="off" required></td></tr>'; echo '</td></tr><tr><td>'.hidden('challenge', $randid).'<input type="text" name="captcha" size="15" autocomplete="off" required></td></tr>';