关于thinkphp上传bmp格式图片
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thinkphp中上传bmp格式图片,缺少了imagecreatefrombmp()方法和imagebmp()方法,
此方法在simplewind\Core\Library\Think\Image\Driver\Gd.class.php中open()和save时调用到,至于其他地方用到的都是相同的方法。
//打开图像open中 if(‘gif‘ == $this->info[‘type‘]){ $class = ‘Think\\Image\\Driver\\GIF‘; $this->gif = new $class($imgname); $this->img = imagecreatefromstring($this->gif->image()); } else { $fun = "imagecreatefrom{$this->info[‘type‘]}"; $this->img = $fun($imgname); }
//保存图像save中
if(‘jpeg‘ == $type || ‘jpg‘ == $type){
//JPEG图像设置隔行扫描
imageinterlace($this->img, $interlace);
imagejpeg($this->img, $imgname,$quality);
}elseif(‘gif‘ == $type && !empty($this->gif)){
$this->gif->save($imgname);
}else{
$fun = ‘image‘.$type;
$fun($this->img, $imgname);
}
方法如下:下面两个函数放在admin/common的公用方法下面,使用的时候会自动调用。
/** * BMP 创建函数 * @author simon * @param string $filename path of bmp file * @example who use,who knows * @return resource of GD */ function imagecreatefrombmp( $filename ){ if ( !$f1 = fopen( $filename, "rb" ) ) return FALSE; $FILE = unpack( "vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread( $f1, 14 ) ); if ( $FILE[‘file_type‘] != 19778 ) return FALSE; $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; $PALETTE = array(); if ( $BMP[‘colors‘] < 16777216 ){ $PALETTE = unpack( ‘V‘ . $BMP[‘colors‘], fread( $f1, $BMP[‘colors‘] * 4 ) ); } $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‘] == 32 ){ $COLOR = unpack( "V", substr( $IMG, $P, 3 ) ); $B = ord(substr($IMG, $P,1)); $G = ord(substr($IMG, $P+1,1)); $R = ord(substr($IMG, $P+2,1)); $color = imagecolorexact( $res, $R, $G, $B ); if ( $color == -1 ) $color = imagecolorallocate( $res, $R, $G, $B ); $COLOR[0] = $R*256*256+$G*256+$B; $COLOR[1] = $color; }elseif ( $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‘]; } fclose( $f1 ); return $res; } /** * 创建bmp格式图片 * * @author: legend([email protected]) * @link: http://www.ugia.cn/?p=96 * @description: create Bitmap-File with GD library * @version: 0.1 * * @param resource $im 图像资源 * @param string $filename 如果要另存为文件,请指定文件名,为空则直接在浏览器输出 * @param integer $bit 图像质量(1、4、8、16、24、32位) * @param integer $compression 压缩方式,0为不压缩,1使用RLE8压缩算法进行压缩 * * @return integer */ function imagebmp(&$im, $filename = ‘‘, $bit = 8, $compression = 0) { if (!in_array($bit, array(1, 4, 8, 16, 24, 32))) { $bit = 8; } else if ($bit == 32) // todo:32 bit { $bit = 24; } $bits = pow(2, $bit); // 调整调色板 imagetruecolortopalette($im, true, $bits); $width = imagesx($im); $height = imagesy($im); $colors_num = imagecolorstotal($im); if ($bit <= 8) { // 颜色索引 $rgb_quad = ‘‘; for ($i = 0; $i < $colors_num; $i ++) { $colors = imagecolorsforindex($im, $i); $rgb_quad .= chr($colors[‘blue‘]) . chr($colors[‘green‘]) . chr($colors[‘red‘]) . "\0"; } // 位图数据 $bmp_data = ‘‘; // 非压缩 if ($compression == 0 || $bit < 8) { if (!in_array($bit, array(1, 4, 8))) { $bit = 8; } $compression = 0; // 每行字节数必须为4的倍数,补齐。 $extra = ‘‘; $padding = 4 - ceil($width / (8 / $bit)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } for ($j = $height - 1; $j >= 0; $j --) { $i = 0; while ($i < $width) { $bin = 0; $limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0; for ($k = 8 - $bit; $k >= $limit; $k -= $bit) { $index = imagecolorat($im, $i, $j); $bin |= $index << $k; $i ++; } $bmp_data .= chr($bin); } $bmp_data .= $extra; } } // RLE8 压缩 else if ($compression == 1 && $bit == 8) { for ($j = $height - 1; $j >= 0; $j --) { $last_index = "\0"; $same_num = 0; for ($i = 0; $i <= $width; $i ++) { $index = imagecolorat($im, $i, $j); if ($index !== $last_index || $same_num > 255) { if ($same_num != 0) { $bmp_data .= chr($same_num) . chr($last_index); } $last_index = $index; $same_num = 1; } else { $same_num ++; } } $bmp_data .= "\0\0"; } $bmp_data .= "\0\1"; } $size_quad = strlen($rgb_quad); $size_data = strlen($bmp_data); } else { // 每行字节数必须为4的倍数,补齐。 $extra = ‘‘; $padding = 4 - ($width * ($bit / 8)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } // 位图数据 $bmp_data = ‘‘; for ($j = $height - 1; $j >= 0; $j --) { for ($i = 0; $i < $width; $i ++) { $index = imagecolorat($im, $i, $j); $colors = imagecolorsforindex($im, $index); if ($bit == 16) { $bin = 0 << $bit; $bin |= ($colors[‘red‘] >> 3) << 10; $bin |= ($colors[‘green‘] >> 3) << 5; $bin |= $colors[‘blue‘] >> 3; $bmp_data .= pack("v", $bin); } else { $bmp_data .= pack("c*", $colors[‘blue‘], $colors[‘green‘], $colors[‘red‘]); } // todo: 32bit; } $bmp_data .= $extra; } $size_quad = 0; $size_data = strlen($bmp_data); $colors_num = 0; } // 位图文件头 $file_header = "BM" . pack("V3", 54 + $size_quad + $size_data, 0, 54 + $size_quad); // 位图信息头 $info_header = pack("V3v2V*", 0x28, $width, $height, 1, $bit, $compression, $size_data, 0, 0, $colors_num, 0); // 写入文件 if ($filename != ‘‘) { $fp = fopen($filename, "wb"); fwrite($fp, $file_header); fwrite($fp, $info_header); fwrite($fp, $rgb_quad); fwrite($fp, $bmp_data); fclose($fp); return 1; } // 浏览器输出 header("Content-Type: image/bmp"); echo $file_header . $info_header; echo $rgb_quad; echo $bmp_data; return 1; }
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