php 将bmp图片转为jpg等其他任意格式的图片
2009-06-29 00:00
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<? 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 ; } ?>
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