RackTables git mirrors - racktables/blob - render_image.php

   1 <?php
   2
   3 // This page outputs PNG rack thumbnail.
   4
   5 require 'inc/init.php';
   6
   7 assertStringArg ('img', __FUNCTION__);
   8 switch ($_REQUEST['img'])
   9 {
  10         case 'minirack':
  11                 // Thumbnails are rendered in security context of rackspace.
  12                 $pageno = 'rackspace';
  13                 $tabno = 'default';
  14                 authorize();
  15                 assertUIntArg ('rack_id', __FUNCTION__);
  16                 renderRackThumb ($_REQUEST['rack_id']);
  17                 break;
  18         case 'progressbar':
  19                 assertUIntArg ('done', __FUNCTION__, TRUE);
  20                 renderProgressBarImage ($_REQUEST['done']);
  21                 break;
  22         default:
  23                 renderError();
  24 }
  25
  26 //------------------------------------------------------------------------
  27 function renderError ()
  28 {
  29         // A hardcoded value is worth of saving lots of code here.
  30         $img = imagecreatefrompng ('pix/error.png');
  31         header("Content-type: image/png");
  32         imagepng ($img);
  33         imagedestroy ($img);
  34 }
  35
  36 // Having a local caching array speeds things up. A little.
  37 function colorFromHex ($image, $hex)
  38 {
  39         static $colorcache = array ();
  40         if (isset ($colorcache[$hex]))
  41                 return $colorcache[$hex];
  42         $r = hexdec ('0x' . substr ($hex, 0, 2));
  43         $g = hexdec ('0x' . substr ($hex, 2, 2));
  44         $b = hexdec ('0x' . substr ($hex, 4, 2));
  45         $c = imagecolorallocate ($image, $r, $g, $b);
  46         $colorcache[$hex] = $c;
  47         return $c;
  48 }
  49
  50 function renderRackThumb ($rack_id = 0)
  51 {
  52         // Don't call DB extra times, hence we are most probably not the
  53         // only script wishing to acces the same data now.
  54         header("Content-type: image/png");
  55         $thumbcache = loadThumbCache ($rack_id);
  56         if ($thumbcache !== NULL)
  57                 echo $thumbcache;
  58         else
  59         {
  60                 ob_start();
  61                 generateMiniRack ($rack_id);
  62                 $capture = ob_get_contents();
  63                 ob_end_flush();
  64                 saveThumbCache ($rack_id, $capture);
  65         }
  66 }
  67
  68 // Output a binary string containing the PNG minirack.
  69 function generateMiniRack ($rack_id)
  70 {
  71         if (($rackData = getRackData ($rack_id, TRUE)) == NULL)
  72         {
  73                 renderError();
  74                 return;
  75         }
  76         markupObjectProblems ($rackData);
  77         // Cache in a local array, because we are going to use those values often.
  78         $rtwidth = array
  79         (
  80                 0 => getConfigVar ('rtwidth_0'),
  81                 1 => getConfigVar ('rtwidth_1'),
  82                 2 => getConfigVar ('rtwidth_2')
  83         );
  84         $offset[0] = 3;
  85         $offset[1] = 3 + $rtwidth[0];
  86         $offset[2] = 3 + $rtwidth[0] + $rtwidth[1];
  87         $totalheight = 3 + 3 + $rackData['height'] * 2;
  88         $totalwidth = $offset[2] + $rtwidth[2] + 3;
  89         $img = @imagecreatetruecolor ($totalwidth, $totalheight)
  90                 or die("Cannot Initialize new GD image stream");
  91         // cache our palette as well
  92         $color = array();
  93         foreach (array ('F', 'A', 'U', 'T', 'Th', 'Tw', 'Thw') as $statecode)
  94                 $color[$statecode] = colorFromHex ($img, getConfigVar ('color_' . $statecode));
  95         imagerectangle ($img, 0, 0, $totalwidth - 1, $totalheight - 1, colorFromHex ($img, '000000'));
  96         imagerectangle ($img, 1, 1, $totalwidth - 2, $totalheight - 2, colorFromHex ($img, 'c0c0c0'));
  97         imagerectangle ($img, 2, 2, $totalwidth - 3, $totalheight - 3, colorFromHex ($img, '000000'));
  98         for ($unit_no = $rackData['height']; $unit_no > 0; $unit_no--)
  99         {
 100                 for ($locidx = 0; $locidx < 3; $locidx++)
 101                 {
 102                         $colorcode = $rackData[$unit_no][$locidx]['state'];
 103                         if (isset ($rackData[$unit_no][$locidx]['hl']))
 104                                 $colorcode = $colorcode . $rackData[$unit_no][$locidx]['hl'];
 105                         imagerectangle
 106                         (
 107                                 $img,
 108                                 $offset[$locidx],
 109                                 3 + ($rackData['height'] - $unit_no) * 2,
 110                                 $offset[$locidx] + $rtwidth[$locidx] - 1,
 111                                 3 + ($rackData['height'] - $unit_no) * 2 + 1,
 112                                 $color[$colorcode]
 113                         );
 114                 }
 115         }
 116         imagepng ($img);
 117         imagedestroy ($img);
 118 }
 119
 120 function renderProgressBarImage ($done)
 121 {
 122         $img = @imagecreatetruecolor (100, 10);
 123         $color['T'] = colorFromHex ($img, getConfigVar ('color_T'));
 124         $color['F'] = colorFromHex ($img, getConfigVar ('color_F'));
 125         imagefilledrectangle ($img, 0, 0, $done, 10, $color['T']);
 126         imagefilledrectangle ($img, $done, 0, 100, 10, $color['F']);
 127         header("Content-type: image/png");
 128         imagepng ($img);
 129         imagedestroy ($img);
 130 }
 131
 132 ?>