PHP imagecreatefrombmp Create a new image from a BMP file or URL_PHP tutorial

Everyone knows that the php GD library can easily create a new image from a URL. GD has imagecreatefromjpeg(), imagecreatefromPNG()... and other functions that can sometimes read BMP images from the URL. The most annoying thing is GD2 There is no imageCreateFromBMP() in Zhongqie. Although there is imagecreatefromWBMP(), it is still far behind!
Using the following FUNCTION can be easily solved

Copy the code The code is as follows:

function imagecreatefrombmp($file)
{
global $CurrentBit, $echoMode;
$f=fopen($file,"r");
$Header=fread($f,2);
if($Header== "BM")
{
$Size=freaddword($f);
$Reserved1=freadword($f);
$Reserved2=freadword($f);
$FirstByteOfImage= freaddword($f);
$SizeBITMAPINFOHEADER=freaddword($f);
$Width=freaddword($f);
$Height=freaddword($f);
$biPlanes=freadword( $f);
$biBitCount=freadword($f);
$RLECompression=freaddword($f);
$WidthxHeight=freaddword($f);
$biXPelsPerMeter=freaddword($f );
$biYPelsPerMeter=freaddword($f);
$NumberOfPalettesUsed=freaddword($f);
$NumberOfImportantColors=freaddword($f);
if($biBitCount<24)
{
$img=imagecreate($Width,$Height);
$Colors=pow(2,$biBitCount);
for($p=0;$p<$Colors;$p++)
{
$B=freadbyte($f);
$G=freadbyte($f);
$R=freadbyte($f);
$Reserved=freadbyte($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--)
{
$CurrentBit=0;
for($x=0;$x<$Width;$x++)
{
$C=freadbits($f,$biBitCount);
imagesetpixel($img,$x,$y,$Palette[$C]);
}
if($CurrentBit!=0) {freadbyte($f);}
for($g= 0;$g<$Zbytek;$g++)
freadbyte($f);
}
}
}
if($RLECompression==1) //$BI_RLE8
{
$y=$Height;
$pocetb=0;
while(true)
{
$y--;
$prefix=freadbyte($f);
$suffix=freadbyte($f);
$pocetb+=2;
$echoit=false;
if($echoit)echo "Prefix: $prefix Suffix: $suffix
";
if(($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($pocetb%2==1) {freadbyte($f); $pocetb++;}
}
if($prefix>0 )
{
$pocet=$prefix;
for($r=0;$r<$pocet;$r++)
$Data.=chr($suffix);
}
$prefix=freadbyte($f);
$suffix=freadbyte($f);
$pocetb+=2;
if($echoit) echo "Prefix: $prefix Suffix: $suffix< ;BR>";
}
for($x=0;$x{
imagesetpixel($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)."
";*/
while(true)
{
//break;
$y--;
$prefix=freadbyte($f );
$suffix=freadbyte($f);
$pocetb+=2;
$echoit=false;
if($echoit)echo "Prefix: $prefix Suffix: $suffixif(($prefix==0)and($suffix==1)) break;
if(feof($f)) break;
while(!(($prefix= =0)and($suffix==0)))
{
if($prefix==0)
{
$pocet=$suffix;
$CurrentBit=0;
for($h=0;$h<$pocet;$h++)
$Data.=chr(freadbits($f,4));
if($CurrentBit!=0) freadbits($ f,4);
$pocetb+=ceil(($pocet/2));
if($pocetb%2==1) {freadbyte($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++;
}
}
$prefix=freadbyte($f);
$suffix =freadbyte($f);
$pocetb+=2;
if($echoit) echo "Prefix: $prefix Suffix: $suffix
";
}
for($x= 0;$x{
imagesetpixel($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++)
{
$B=freadbyte($f);
$G=freadbyte($f);
$R=freadbyte($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;$z++)
freadbyte($f);
}
}
return $img;
}
fclose($f);
}
function freadbyte($f)
{
return ord(fread( $f,1));
}
function freadword($f)
{
$b1=freadbyte($f);
$b2=freadbyte($f);
return $b2*256+$b1;
}
function freaddword($f)
{
$b1=freadword($f);
$b2=freadword($f) ;
return $b2*65536+$b1;
}

http://www.bkjia.com/PHPjc/325636.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/325636.htmlTechArticleEveryone knows that the php GD library can easily create an image from a URL. GD includes imagecreatefromjpeg(), imagecreatefromPNG( )....etc. FUNCTION can sometimes read from the URL cut BMP images and hateful...