php 将bmp图片转为jpg等其他任意格式的图片_php实例

<? php <BR>// 例子： <BR>$path = ROOT . ' upload/2009/06/03/124401282315771. ' ; <BR>$pathAll = $path . ' bmp ' ; <BR>$mi = '' ; <BR>$mi = ImageCreateFromBMP( $pathAll ); <BR>imagejpeg( $mi , $path . ' jpg ' ); <BR>// 函数如下： <BR>function ImageCreateFromBMP( $filename ) <BR>{ <BR>// Ouverture du fichier en mode binaire <BR>if ( ! $f1 = fopen ( $filename , " rb " )) return FALSE ; <BR>// 1 : Chargement des ent�tes FICHIER <BR>$FILE = unpack ( " vfile_type/Vfile_size/Vreserved/Vbitmap_offset " , fread ( $f1 , 14 )); <BR>if ( $FILE [ ' file_type ' ] != 19778 ) return FALSE ; <BR>// 2 : Chargement des ent�tes BMP <BR>$BMP = unpack ( ' Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel ' . <BR>' /Vcompression/Vsize_bitmap/Vhoriz_resolution ' . <BR>' /Vvert_resolution/Vcolors_used/Vcolors_important ' , fread ( $f1 , 40 )); <BR>$BMP [ ' colors ' ] = pow ( 2 , $BMP [ ' bits_per_pixel ' ]); <BR>if ( $BMP [ ' size_bitmap ' ] == 0 ) $BMP [ ' size_bitmap ' ] = $FILE [ ' file_size ' ] - $FILE [ ' bitmap_offset ' ]; <BR>$BMP [ ' bytes_per_pixel ' ] = $BMP [ ' bits_per_pixel ' ] / 8 ; <BR>$BMP [ ' bytes_per_pixel2 ' ] = ceil ( $BMP [ ' bytes_per_pixel ' ]); <BR>$BMP [ ' decal ' ] = ( $BMP [ ' width ' ] * $BMP [ ' bytes_per_pixel ' ] / 4 ); <BR>$BMP [ ' decal ' ] -= floor ( $BMP [ ' width ' ] * $BMP [ ' bytes_per_pixel ' ] / 4 ); <BR>$BMP [ ' decal ' ] = 4 - ( 4 * $BMP [ ' decal ' ]); <BR>if ( $BMP [ ' decal ' ] == 4 ) $BMP [ ' decal ' ] = 0 ; <BR>// 3 : Chargement des couleurs de la palette <BR>$PALETTE = array (); <BR>if ( $BMP [ ' colors ' ] < 16777216 ) <BR>{ <BR>$PALETTE = unpack ( ' V ' . $BMP [ ' colors ' ] , fread ( $f1 , $BMP [ ' colors ' ] * 4 )); <BR>} <BR>// 4 : Cr�ation de l'image <BR>$IMG = fread ( $f1 , $BMP [ ' size_bitmap ' ]); <BR>$VIDE = chr ( 0 ); <BR>$res = imagecreatetruecolor( $BMP [ ' width ' ] , $BMP [ ' height ' ]); <BR>$P = 0 ; <BR>$Y = $BMP [ ' height ' ] - 1 ; <BR>while ( $Y >= 0 ) <BR>{ <BR>$X = 0 ; <BR>while ( $X < $BMP [ ' width ' ]) <BR>{ <BR>if ( $BMP [ ' bits_per_pixel ' ] == 24 ) <BR>$COLOR = unpack ( " V " , substr ( $IMG , $P , 3 ) . $VIDE ); <BR>elseif ( $BMP [ ' bits_per_pixel ' ] == 16 ) <BR>{ <BR>$COLOR = unpack ( " n " , substr ( $IMG , $P , 2 )); <BR>$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ]; <BR>} <BR>elseif ( $BMP [ ' bits_per_pixel ' ] == 8 ) <BR>{ <BR>$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , $P , 1 )); <BR>$COLOR [ 1 ] = $P<em style="color:transparent">本文来源[email protected]搞@^&代*@码)网9</em><strong>搞代gaodaima码</strong>ALETTE [ $COLOR [ 1 ] + 1 ]; <BR>} <BR>elseif ( $BMP [ ' bits_per_pixel ' ] == 4 ) <BR>{ <BR>$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , floor ( $P ) , 1 )); <BR>if (( $P * 2 ) % 2 == 0 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] >> 4 ) ; else $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x0F ); <BR>$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ]; <BR>} <BR>elseif ( $BMP [ ' bits_per_pixel ' ] == 1 ) <BR>{ <BR>$COLOR = unpack ( " n " , $VIDE . substr ( $IMG , floor ( $P ) , 1 )); <BR>if (( $P * 8 ) % 8 == 0 ) $COLOR [ 1 ] = $COLOR [ 1 ] >> 7 ; <BR>elseif (( $P * 8 ) % 8 == 1 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x40 ) >> 6 ; <BR>elseif (( $P * 8 ) % 8 == 2 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x20 ) >> 5 ; <BR>elseif (( $P * 8 ) % 8 == 3 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x10 ) >> 4 ; <BR>elseif (( $P * 8 ) % 8 == 4 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x8 ) >> 3 ; <BR>elseif (( $P * 8 ) % 8 == 5 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x4 ) >> 2 ; <BR>elseif (( $P * 8 ) % 8 == 6 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x2 ) >> 1 ; <BR>elseif (( $P * 8 ) % 8 == 7 ) $COLOR [ 1 ] = ( $COLOR [ 1 ] & 0x1 ); <BR>$COLOR [ 1 ] = $PALETTE [ $COLOR [ 1 ] + 1 ]; <BR>} <BR>else <BR>return FALSE ; <BR>imagesetpixel( $res , $X , $Y , $COLOR [ 1 ]); <BR>$X ++ ; <BR>$P += $BMP [ ' bytes_per_pixel ' ]; <BR>} <BR>$Y -- ; <BR>$P += $BMP [ ' decal ' ]; <BR>} <BR>// Fermeture du fichier <BR>fclose ( $f1 ); <BR>return $res ; <BR>} <BR>?> <BR>

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