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Import memory images
InformationsAuthor: Xavier Nicolay
License: Freeware
DescriptionThis script allows to display images that are loaded in memory without the need of
temporary files. There are 2 main usages:
- When an image is retrieved from a database
- When an image is created with GD
MemImage(string data, float x, float y [, float w [, float h, [array link]]])
$data holds the image in memory. It must be in PNG format.
GDImage(resource im, float x, float y [, float w [, float h, [array link]]])
$im is a GD identifier. If you use JpGraph, you can retrieve it via a call to
$graph->Stroke(_IMG_HANDLER) (from version 1.10.1).
Moreover, this script allows to call the standard Image() method with a URL of the form:
var://variable
where variable is a global variable holding an image (PNG or JPEG).
This feature requires PHP>=4.3.2 and FPDF>=1.52.
Source
<?php
require('fpdf.php');
class VariableStream
{
// Stream handler to read from global variables
var $varname;
var $position;
function stream_open($path, $mode, $options, &$opened_path)
{
$url = parse_url($path);
$this->varname = $url['host'];
if(!isset($GLOBALS[$this->varname]))
{
trigger_error('Global variable '.$this->varname.' does not exist', E_USER_WARNING);
return false;
}
$this->position = 0;
return true;
}
function stream_read($count)
{
$ret = substr($GLOBALS[$this->varname], $this->position, $count);
$this->position += strlen($ret);
return $ret;
}
function stream_eof()
{
return $this->position >= strlen($GLOBALS[$this->varname]);
}
}
class MEM_IMAGE extends FPDF
{
// (c) Xavier Nicolay
// V1.0 : 2004-01-17
//
// CONSTRUCTOR
//
function MEM_IMAGE($orientation='P', $unit='mm', $format='A4')
{
$this->FPDF($orientation, $unit, $format);
//Register var stream protocol (requires PHP>=4.3.2)
if(function_exists('stream_wrapper_register'))
stream_wrapper_register('var', 'VariableStream');
}
//
// PRIVATE FUNCTIONS
//
function _readstr($var, &$pos, $n)
{
//Read some bytes from string
$string = substr($var, $pos, $n);
$pos += $n;
return $string;
}
function _readstr_int($var, &$pos)
{
//Read a 4-byte integer from string
$i =ord($this->_readstr($var, $pos, 1))<<24;
$i+=ord($this->_readstr($var, $pos, 1))<<16;
$i+=ord($this->_readstr($var, $pos, 1))<<8;
$i+=ord($this->_readstr($var, $pos, 1));
return $i;
}
function _parsemempng($var)
{
$pos=0;
//Check signature
$sig = $this->_readstr($var, $pos, 8);
if($sig != chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10))
$this->Error('Not a PNG image');
//Read header chunk
$this->_readstr($var, $pos, 4);
$ihdr = $this->_readstr($var, $pos, 4);
if( $ihdr != 'IHDR')
$this->Error('Incorrect PNG Image');
$w=$this->_readstr_int($var, $pos);
$h=$this->_readstr_int($var, $pos);
$bpc=ord($this->_readstr($var, $pos, 1));
if($bpc>8)
$this->Error('16-bit depth not supported: '.$file);
$ct=ord($this->_readstr($var, $pos, 1));
if($ct==0)
$colspace='DeviceGray';
elseif($ct==2)
$colspace='DeviceRGB';
elseif($ct==3)
$colspace='Indexed';
else
$this->Error('Alpha channel not supported: '.$file);
if(ord($this->_readstr($var, $pos, 1))!=0)
$this->Error('Unknown compression method: '.$file);
if(ord($this->_readstr($var, $pos, 1))!=0)
$this->Error('Unknown filter method: '.$file);
if(ord($this->_readstr($var, $pos, 1))!=0)
$this->Error('Interlacing not supported: '.$file);
$this->_readstr($var, $pos, 4);
$parms='/DecodeParms <</Predictor 15 /Colors '.($ct==2 ? 3 : 1).' /BitsPerComponent '.$bpc.' /Columns '.$w.'>>';
//Scan chunks looking for palette, transparency and image data
$pal='';
$trns='';
$data='';
do
{
$n=$this->_readstr_int($var, $pos);
$type=$this->_readstr($var, $pos, 4);
if($type=='PLTE')
{
//Read palette
$pal=$this->_readstr($var, $pos, $n);
$this->_readstr($var, $pos, 4);
}
elseif($type=='tRNS')
{
//Read transparency info
$t=$this->_readstr($var, $pos, $n);
if($ct==0)
$trns=array(ord(substr($t, 1, 1)));
elseif($ct==2)
$trns=array(ord(substr($t, 1, 1)), ord(substr($t, 3, 1)), ord(substr($t, 5, 1)));
else
{
$pos=strpos($t, chr(0));
if(is_int($pos))
$trns=array($pos);
}
$this->_readstr($var, $pos, 4);
}
elseif($type=='IDAT')
{
//Read image data block
$data.=$this->_readstr($var, $pos, $n);
$this->_readstr($var, $pos, 4);
}
elseif($type=='IEND')
break;
else
$this->_readstr($var, $pos, $n+4);
}
while($n);
if($colspace=='Indexed' and empty($pal))
$this->Error('Missing palette in '.$file);
return array('w'=>$w,
'h'=>$h,
'cs'=>$colspace,
'bpc'=>$bpc,
'f'=>'FlateDecode',
'parms'=>$parms,
'pal'=>$pal,
'trns'=>$trns,
'data'=>$data);
}
/********************/
/* PUBLIC FUNCTIONS */
/********************/
function MemImage($data, $x, $y, $w=0, $h=0, $link='')
{
//Put the PNG image stored in $data
$id = md5($data);
if(!isset($this->images[$id]))
{
$info = $this->_parsemempng( $data );
$info['i'] = count($this->images)+1;
$this->images[$id]=$info;
}
else
$info=$this->images[$id];
//Automatic width and height calculation if needed
if($w==0 and $h==0)
{
//Put image at 72 dpi
$w=$info['w']/$this->k;
$h=$info['h']/$this->k;
}
if($w==0)
$w=$h*$info['w']/$info['h'];
if($h==0)
$h=$w*$info['h']/$info['w'];
$this->_out(sprintf('q %.2f 0 0 %.2f %.2f %.2f cm /I%d Do Q', $w*$this->k, $h*$this->k, $x*$this->k, ($this->h-($y+$h))*$this->k, $info['i']));
if($link)
$this->Link($x, $y, $w, $h, $link);
}
function GDImage($im, $x, $y, $w=0, $h=0, $link='')
{
//Put the GD image $im
ob_start();
imagepng($im);
$data = ob_get_contents();
ob_end_clean();
$this->MemImage($data, $x, $y, $w, $h, $link);
}
}
?>
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Example
<?php
require('mem_image.php');
$pdf=new MEM_IMAGE();
$pdf->AddPage();
//Create a GD graphic
$im=imagecreate(200, 150);
$bgcolor=imagecolorallocate($im, 255, 255, 255);
$bordercolor=imagecolorallocate($im, 0, 0, 0);
$color1=imagecolorallocate($im, 255, 0, 0);
$color2=imagecolorallocate($im, 0, 255, 0);
$color3=imagecolorallocate($im, 0, 0, 255);
imagefilledrectangle($im, 0, 0, 199, 149, $bgcolor);
imagerectangle($im, 0, 0, 199, 149, $bordercolor);
imagefilledrectangle($im, 30, 100, 60, 148, $color1);
imagefilledrectangle($im, 80, 80, 110, 148, $color2);
imagefilledrectangle($im, 130, 40, 160, 148, $color3);
//Output it
$pdf->GDImage($im, 50, 25, 40);
imagedestroy($im);
//Load an image in a global variable
$logo=file_get_contents('logo.jpg');
//Output it (requires PHP>=4.3.2 and FPDF>=1.52)
$pdf->Image('var://logo', 120, 28, 0, 0, 'JPEG');
$pdf->Output();
?>
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View the result here.
DownloadZIP | TGZ
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