php 将bmp图片转为jpg等其他任意格式的图片
author:一佰互联 2019-05-01   click:163
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�tes FICHIER
$FILE = unpack ( " vfile_type/Vfile_size/Vreserved/Vbitmap_offset " , fread ( $f1 , 14 ));
if ( $FILE [ " file_type " ] != 19778 ) return FALSE ;
// 2 : Chargement des ent�tes BMP
$BMP = unpack ( " Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel " .
" /Vcompression/Vsize_bitmap/Vhoriz_resolution " .
" /Vvert_resolution/Vcolors_used/Vcolors_important " , fread ( $f1 , 40 ));
$BMP [ " colors " ] = pow ( 2 , $BMP [ " bits_per_pixel " ]);
if ( $BMP [ " size_bitmap " ] == 0 ) $BMP [ " size_bitmap " ] = $FILE [ " file_size " ] - $FILE [ " bitmap_offset " ];
$BMP [ " bytes_per_pixel " ] = $BMP [ " bits_per_pixel " ] / 8 ;
$BMP [ " bytes_per_pixel2 " ] = ceil ( $BMP [ " bytes_per_pixel " ]);
$BMP [ " decal " ] = ( $BMP [ " width " ] * $BMP [ " bytes_per_pixel " ] / 4 );
$BMP [ " decal " ] -= floor ( $BMP [ " width " ] * $BMP [ " bytes_per_pixel " ] / 4 );
$BMP [ " decal " ] = 4 - ( 4 * $BMP [ " decal " ]);
if ( $BMP [ " decal " ] == 4 ) $BMP [ " decal " ] = 0 ;
// 3 : Chargement des couleurs de la palette
$PALETTE = array ();
if ( $BMP [ " colors " ] < 16777216 )
{
$PALETTE = unpack ( " V " . $BMP [ " colors " ] , fread ( $f1 , $BMP [ " colors " ] * 4 ));
}
// 4 : Cr�ation de l"image
$IMG = fread ( $f1 , $BMP [ " size_bitmap " ]);
$VIDE = chr ( 0 );
$res = imagecreatetruecolor( $BMP [ " width " ] , $BMP [ " height " ]);
$P = 0 ;
$Y = $BMP [ " height " ] - 1 ;
while ( $Y >= 0 )
{
$X = 0 ;
while ( $X < $BMP [ " width " ])
{
if ( $BMP [ " bits_per_pixel " ] == 24 )
$COLOR = unpack ( " 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 ;
}
?>