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标题: php 将bmp格式的图片转换成任意格式 [打印本页]

作者: fangzhen 时间: 2009-12-30 15:34 标题: php 将bmp格式的图片转换成任意格式

$path = 'images/bmp.' ; $pathAll = $path.'bmp' ; $mi = '' ; $mi = ImageCreateFromBMP1( $pathAll ); imagejpeg($mi, $path.'jpg'); imagegif($mi, $path.'gif'); // 函数如下： function ImageCreateFromBMP1( $filename ) { // Ouverture du fichier en mode binaire if (!$f1 = fopen ( $filename , "rb" )) return FALSE ; // 1 : Chargement des FICHIER $FILE = unpack ( "vfile_type/Vfile_size/Vreserved/Vbitmap_offset" , fread ( $f1 , 14 )); if ($FILE ['file_type'] != 19778 ) return FALSE ; // 2 : Chargement des 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 : '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 ; }

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