<?
/**
 * @package com.jpexs.image.bmp
 *
 * JPEXS BMP Image functions
 * @version 1.1
 * @author JPEXS
 * @copyright (c) JPEXS 2004-2009
 *
 * Webpage: http://www.jpexs.com
 * Email: jpexs@jpexs.com
 *
 * If you like my script, you can donate... visit my webpages or email me for more info.
 *
 *        Version changes:
 *                v1.1 - redesigned sourcecode, phpdoc included, all internal functions and global variables have prefix "jpexs_"
 *
 * TODO list:
 *      - better error handling
 *      - class encapsulation
 * License:
 *      - you can freely use it
 *      - you can freely distribute sourcecode
 *      - you can freely modify it as long as you leave my copyright/author info in source code
 *      - if you developing closesource application, you should add my name at least to "about" page of your web application
 *      - if you create an amazing modification, please contact me... I can publish link to your webpage if you're interested...
 *      - if you want to use my script in commercial application for earning money, you should make a donation to me first
 */



/**
 * Creates new BMP file from image resource
 * @param resource $img Image resource to convert
 * @param string $file File to save image to. If ommited or "", file is written to standard output
 * @param boolean $useRLE When true, file will be saved with RLE compression (EXPERIMENTAL)
 * @return boolean True when successfully writen to specified file
 */
function imagebmp($img,$file="",$useRLE=false)
{


$ColorCount=imagecolorstotal($img);

$Transparent=imagecolortransparent($img);
$IsTransparent=$Transparent!=-1;


if($IsTransparent) $ColorCount--;

if($ColorCount==0) {$ColorCount=0; $BitCount=24;};
if(($ColorCount>0)and($ColorCount<=2)) {$ColorCount=2; $BitCount=1;};
if(($ColorCount>2)and($ColorCount<=16)) { $ColorCount=16; $BitCount=4;};
if(($ColorCount>16)and($ColorCount<=256)) { $ColorCount=0; $BitCount=8;};


                $Width=imagesx($img);
                $Height=imagesy($img);

                $Zbytek=(4-($Width/(8/$BitCount))%4)%4;

                if($BitCount<24) $palsize=pow(2,$BitCount)*4;

                $size=(floor($Width/(8/$BitCount))+$Zbytek)*$Height+54;
                $size+=$palsize;
                $offset=54+$palsize;

                // Bitmap File Header
                $ret = 'BM';                        // header (2b)
                $ret .= jpexs_int_to_dword($size);        // size of file (4b)
                $ret .= jpexs_int_to_dword(0);        // reserved (4b)
                $ret .= jpexs_int_to_dword($offset);        // byte location in the file which is first byte of IMAGE (4b)
                // Bitmap Info Header
                $ret .= jpexs_int_to_dword(40);        // Size of BITMAPINFOHEADER (4b)
                $ret .= jpexs_int_to_dword($Width);        // width of bitmap (4b)
                $ret .= jpexs_int_to_dword($Height);        // height of bitmap (4b)
                $ret .= jpexs_int_to_word(1);        // biPlanes = 1 (2b)
                $ret .= jpexs_int_to_word($BitCount);        // biBitCount = {1 (mono) or 4 (16 clr ) or 8 (256 clr) or 24 (16 Mil)} (2b)
                $ret .= jpexs_int_to_dword($useRLE);        // RLE COMPRESSION (4b)
                $ret .= jpexs_int_to_dword(0);        // width x height (4b)
                $ret .= jpexs_int_to_dword(0);        // biXPelsPerMeter (4b)
                $ret .= jpexs_int_to_dword(0);        // biYPelsPerMeter (4b)
                $ret .= jpexs_int_to_dword(0);        // Number of palettes used (4b)
                $ret .= jpexs_int_to_dword(0);        // Number of important colour (4b)
                // image data

                $CC=$ColorCount;
                $sl1=strlen($ret);
                if($CC==0) $CC=256;
                if($BitCount<24)
                   {
                    $ColorTotal=imagecolorstotal($img);
                     if($IsTransparent) $ColorTotal--;

                     for($p=0;$p<$ColorTotal;$p++)
                     {
                      $color=imagecolorsforindex($img,$p);
                       $ret.=jpexs_inttobyte($color["blue"]);
                       $ret.=jpexs_inttobyte($color["green"]);
                       $ret.=jpexs_inttobyte($color["red"]);
                       $ret.=jpexs_inttobyte(0); //RESERVED
                     };

                    $CT=$ColorTotal;
                  for($p=$ColorTotal;$p<$CC;$p++)
                       {
                      $ret.=jpexs_inttobyte(0);
                      $ret.=jpexs_inttobyte(0);
                      $ret.=jpexs_inttobyte(0);
                      $ret.=jpexs_inttobyte(0); //RESERVED
                     };
                   };


if($BitCount<=8)
{

 for($y=$Height-1;$y>=0;$y--)
 {
  $bWrite="";
  for($x=0;$x<$Width;$x++)
   {
   $color=imagecolorat($img,$x,$y);
   $bWrite.=jpexs_decbinx($color,$BitCount);
   if(strlen($bWrite)==8)
    {
     $retd.=jpexs_inttobyte(bindec($bWrite));
     $bWrite="";
    };
   };

  if((strlen($bWrite)<8)and(strlen($bWrite)!=0))
    {
     $sl=strlen($bWrite);
     for($t=0;$t<8-$sl;$t++)
      $sl.="0";
     $retd.=jpexs_inttobyte(bindec($bWrite));
    };
 for($z=0;$z<$Zbytek;$z++)
   $retd.=jpexs_inttobyte(0);
 };
};

if(($useRLE)and($BitCount==8))
{
 for($t=0;$t<strlen($retd);$t+=4)
  {
   if($t!=0)
   if(($t)%$Width==0)
    $ret.=chr(0).chr(0);

   if(($t+5)%$Width==0)
   {
     $ret.=chr(0).chr(5).substr($retd,$t,5).chr(0);
     $t+=1;
   }
   if(($t+6)%$Width==0)
    {
     $ret.=chr(0).chr(6).substr($retd,$t,6);
     $t+=2;
    }
    else
    {
     $ret.=chr(0).chr(4).substr($retd,$t,4);
    };
  };
  $ret.=chr(0).chr(1);
}
else
{
$ret.=$retd;
};


                if($BitCount==24)
                {
                for($z=0;$z<$Zbytek;$z++)
                 $Dopl.=chr(0);

                for($y=$Height-1;$y>=0;$y--)
                 {
                 for($x=0;$x<$Width;$x++)
                        {
                           $color=imagecolorsforindex($img,ImageColorAt($img,$x,$y));
                           $ret.=chr($color["blue"]).chr($color["green"]).chr($color["red"]);
                        }
                 $ret.=$Dopl;
                 };

                 };

  if($file!="")
   {
    $r=($f=fopen($file,"w"));
    $r=$r and fwrite($f,$ret);
    $r=$r and fclose($f);
    return $r;
   }
  else
  {
   echo $ret;
  };
};


/**
 * Reads image from a BMP file and converts it to image resource
 * @global int $jpexs_CurrentBit Internal variable
 * @param string $file File to read BMP image from
 * @return resource Image resource or false on error
 *
 * Note:
 *  Reading RLE compressed bitmaps is EXPERIMENTAL
 *  Reading palette based bitmaps with less than 8bit palette is EXPERIMENTAL
 */
function imagecreatefrombmp($file)
{
global  $jpexs_CurrentBit;

$f=fopen($file,"r");
$Header=fread($f,2);

if($Header=="BM")
{
 $Size=jpexs_freaddword($f);
 $Reserved1=jpexs_freadword($f);
 $Reserved2=jpexs_freadword($f);
 $FirstByteOfImage=jpexs_freaddword($f);

 $SizeBITMAPINFOHEADER=jpexs_freaddword($f);
 $Width=jpexs_freaddword($f);
 $Height=jpexs_freaddword($f);
 $biPlanes=jpexs_freadword($f);
 $biBitCount=jpexs_freadword($f);
 $RLECompression=jpexs_freaddword($f);
 $WidthxHeight=jpexs_freaddword($f);
 $biXPelsPerMeter=jpexs_freaddword($f);
 $biYPelsPerMeter=jpexs_freaddword($f);
 $NumberOfPalettesUsed=jpexs_freaddword($f);
 $NumberOfImportantColors=jpexs_freaddword($f);

if($biBitCount<24)
 {
  $img=imagecreate($Width,$Height);
  $Colors=pow(2,$biBitCount);
  for($p=0;$p<$Colors;$p++)
   {
    $B=jpexs_freadbyte($f);
    $G=jpexs_freadbyte($f);
    $R=jpexs_freadbyte($f);
    $Reserved=jpexs_freadbyte($f);
    $Palette[]=imagecolorallocate($img,$R,$G,$B);
   };




if($RLECompression==0)
{
   $Zbytek=(4-ceil(($Width/(8/$biBitCount)))%4)%4;

for($y=$Height-1;$y>=0;$y--)
    {
     $jpexs_CurrentBit=0;
     for($x=0;$x<$Width;$x++)
      {
         $C=jpexs_freadbits($f,$biBitCount);
       imagesetpixel($img,$x,$y,$Palette[$C]);
      };
    if($jpexs_CurrentBit!=0) {jpexs_freadbyte($f);};
    for($g=0;$g<$Zbytek;$g++)
     jpexs_freadbyte($f);
     };

 };
};


if($RLECompression==1) //$BI_RLE8
{
$y=$Height;

$pocetb=0;

while(true)
{
$y--;
$prefix=jpexs_freadbyte($f);
$suffix=jpexs_freadbyte($f);
$pocetb+=2;

$echoit=false;

if($echoit)echo "Prefix: $prefix Suffix: $suffix<BR>";
if(($prefix==0)and($suffix==1)) break;
if(feof($f)) break;

while(!(($prefix==0)and($suffix==0)))
{
 if($prefix==0)
  {
   $pocet=$suffix;
   $Data.=fread($f,$pocet);
   $pocetb+=$pocet;
   if($pocetb%2==1) {jpexs_freadbyte($f); $pocetb++;};
  };
 if($prefix>0)
  {
   $pocet=$prefix;
   for($r=0;$r<$pocet;$r++)
    $Data.=chr($suffix);
  };
 $prefix=jpexs_freadbyte($f);
 $suffix=jpexs_freadbyte($f);
 $pocetb+=2;
 if($echoit) echo "Prefix: $prefix Suffix: $suffix<BR>";
};

for($x=0;$x<strlen($Data);$x++)
 {
  imagesetpixel($img,$x,$y,$Palette[ord($Data[$x])]);
 };
$Data="";

};

};


if($RLECompression==2) //$BI_RLE4
{
$y=$Height;
$pocetb=0;

/*while(!feof($f))
 echo freadbyte($f)."_".freadbyte($f)."<BR>";*/
while(true)
{
//break;
$y--;
$prefix=jpexs_freadbyte($f);
$suffix=jpexs_freadbyte($f);
$pocetb+=2;

$echoit=false;

if($echoit)echo "Prefix: $prefix Suffix: $suffix<BR>";
if(($prefix==0)and($suffix==1)) break;
if(feof($f)) break;

while(!(($prefix==0)and($suffix==0)))
{
 if($prefix==0)
  {
   $pocet=$suffix;

   $jpexs_CurrentBit=0;
   for($h=0;$h<$pocet;$h++)
    $Data.=chr(jpexs_freadbits($f,4));
   if($jpexs_CurrentBit!=0) jpexs_freadbits($f,4);
   $pocetb+=ceil(($pocet/2));
   if($pocetb%2==1) {jpexs_freadbyte($f); $pocetb++;};
  };
 if($prefix>0)
  {
   $pocet=$prefix;
   $i=0;
   for($r=0;$r<$pocet;$r++)
    {
    if($i%2==0)
     {
      $Data.=chr($suffix%16);
     }
     else
     {
      $Data.=chr(floor($suffix/16));
     };
    $i++;
    };
  };
 $prefix=jpexs_freadbyte($f);
 $suffix=jpexs_freadbyte($f);
 $pocetb+=2;
 if($echoit) echo "Prefix: $prefix Suffix: $suffix<BR>";
};

for($x=0;$x<strlen($Data);$x++)
 {
  imagesetpixel($img,$x,$y,$Palette[ord($Data[$x])]);
 };
$Data="";

};

};


 if($biBitCount==24)
{
 $img=imagecreatetruecolor($Width,$Height);
 $Zbytek=$Width%4;

   for($y=$Height-1;$y>=0;$y--)
    {
     for($x=0;$x<$Width;$x++)
      {
       $B=jpexs_freadbyte($f);
       $G=jpexs_freadbyte($f);
       $R=jpexs_freadbyte($f);
       $color=imagecolorexact($img,$R,$G,$B);
       if($color==-1) $color=imagecolorallocate($img,$R,$G,$B);
       imagesetpixel($img,$x,$y,$color);
      }
    for($z=0;$z<$Zbytek;$z++)
     jpexs_freadbyte($f);
   };
};
return $img;

}
else{
    return false;
}


fclose($f);


};





/*
* Internal functions:
*-------------------------
*
* jpexs_freadbyte($file) - reads 1 byte from $file
* jpexs_freadword($file) - reads 2 bytes (1 word) from $file
* jpexs_freaddword($file) - reads 4 bytes (1 dword) from $file
* jpexs_freadlngint($file) - same as freaddword($file)
* jpexs_decbin8($d) - returns binary string of d zero filled to 8
* jpexs_retBits($byte,$start,$len) - returns bits $start->$start+$len from $byte
* jpexs_freadbits($file,$count) - reads next $count bits from $file
* jpexs_int_to_dword($n) - returns 4 byte representation of $n
* jpexs_int_to_word($n) - returns 2 byte representation of $n
*/

function jpexs_freadbyte($f)
{
 return ord(fread($f,1));
};

function jpexs_freadword($f)
{
 $b1=jpexs_freadbyte($f);
 $b2=jpexs_freadbyte($f);
 return $b2*256+$b1;
};


function jpexs_freadlngint($f)
{
return jpexs_freaddword($f);
};

function jpexs_freaddword($f)
{
 $b1=jpexs_freadword($f);
 $b2=jpexs_freadword($f);
 return $b2*65536+$b1;
};



function jpexs_retBits($byte,$start,$len)
{
$bin=jpexs_decbin8($byte);
$r=bindec(substr($bin,$start,$len));
return $r;

};



$jpexs_CurrentBit=0;
function jpexs_freadbits($f,$count)
{
 global $jpexs_CurrentBit,$SMode;
 $Byte=jpexs_freadbyte($f);
 $LastCBit=$jpexs_CurrentBit;
 $jpexs_CurrentBit+=$count;
 if($jpexs_CurrentBit==8)
  {
   $jpexs_CurrentBit=0;
  }
 else
  {
   fseek($f,ftell($f)-1);
  };
 return jpexs_retBits($Byte,$LastCBit,$count);
};



        function jpexs_int_to_dword($n)
        {
                return chr($n & 255).chr(($n >> 8) & 255).chr(($n >> 16) & 255).chr(($n >> 24) & 255);
        }
        function jpexs_int_to_word($n)
        {
                return chr($n & 255).chr(($n >> 8) & 255);
        }


function jpexs_decbin8($d)
{
return jpexs_decbinx($d,8);
};

function jpexs_decbinx($d,$n)
{
$bin=decbin($d);
$sbin=strlen($bin);
for($j=0;$j<$n-$sbin;$j++)
 $bin="0$bin";
return $bin;
};

function jpexs_inttobyte($n)
{
return chr($n);
};

?>