php 将bmp图片转为jpg等其他任意格式的图片

复制代码 代码如下:
<? php
// 例子：
$path = ROOT . ' upload/2009/06/03/124401282315771. ' ;
$pathAll = $path . ' bmp ' ;
$mi = '' ;
$mi = ImageCreateFromBMP( $pathAll );
imagejpeg( $mi , $path . ' jpg ' );
// 函数如下：
function ImageCreateFromBMP( $filename )
{
// Ouverture du fichier en mode binaire
if ( ! $f1 = fopen ( $filename , " rb " )) return FALSE ;
// 1 : Chargement des ent" vfile_type/Vfile_size/Vreserved/Vbitmap_offset " , fread ( $f1 , 14 ));
if ( $FILE [ ' file_type ' ] != 19778 ) return FALSE ;
// 2 : Chargement des ent" V " , substr ( $IMG , $P , 3 ) . $VIDE );
elseif ( $BMP [ ' bits_per_pixel ' ] == 16 )
{
$COLOR = unpack ( " n " , substr ( $IMG , $P , 2 ));
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 8 )
{
$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , $P , 1 ));
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 4 )
{
$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , floor ( $P ) , 1 ));
if (( $P * 2 ) % 2 == 0 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] 4 ) ; else $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x0F );
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
elseif ( $BMP [ ' bits_per_pixel ' ] == 1 )
{
$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , floor ( $P ) , 1 ));
if (( $P * 8 ) % 8 == 0 ) $COLOR [ 1 ] = $COLOR [ 1 ] 7 ;
elseif (( $P * 8 ) % 8 == 1 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x40 ) 6 ;
elseif (( $P * 8 ) % 8 == 2 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x20 ) 5 ;
elseif (( $P * 8 ) % 8 == 3 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x10 ) 4 ;
elseif (( $P * 8 ) % 8 == 4 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x8 ) 3 ;
elseif (( $P * 8 ) % 8 == 5 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x4 ) 2 ;
elseif (( $P * 8 ) % 8 == 6 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x2 ) 1 ;
elseif (( $P * 8 ) % 8 == 7 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x1 );
$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ];
}
else
return FALSE ;
imagesetpixel( $res , $X , $Y , $COLOR [ 1 ]);
$X ++ ;
$P += $BMP [ ' bytes_per_pixel ' ];
}
$Y -- ;
$P += $BMP [ ' decal ' ];
}
// Fermeture du fichier
fclose ( $f1 );
return $res ;
}
?>