- class Thumb
- {
- public function create($srcPath, $dstPath, $dstWidth, $dstHeight)
- {
- if (!file_exists($srcPath)) {
- return false;
- }
- @$srcSize = getimagesize($srcPath);
- if (empty($srcSize)) {
- return false;
- }
- $srcWith = intval($srcSize[0]);
- $srcHeight = intval($srcSize) [1]);
- //元の画像のサイズが指定されたサムネイルのサイズより大きい場合はサムネイルを生成し、それ以外の場合は元のファイルをコピーします
- if ($srcWith <= $dstWidth && $srcHeight <; = $dstHeight) {
- return copy($srcPath, $dstPath);
- }
- //元の画像リソースを読み込みます
- @$srcImage = imagecreatefromjpeg($srcPath);
- if (empty($srcImage)) {
- @ $srcImage = imagecreatefromgif( $srcPath);
- }
- if (empty($srcImage)) {
- @$srcImage = imagecreatefrompng($srcPath);
- }
- if (empty($srcImage)) {
- @$srcImage = $ this->_imageCreateFromBMP ($srcPath);
- }
-
- if (empty($srcImage)) {
- return false;
- }
-
- //サムネイルのサイズを取得し、それに応じて新しい画像を生成します
- $dstSize = $ this->getDstSize(
- $srcWith, $srcHeight, $dstWidth, $dstHeight
- );
-
- @$dstImage = imagecreatetruecolor(
- $dstSize['width'], $dstSize['height']
- );
-
- @imagecopyresampled(
- $dstImage, $srcImage , 0, 0, 0, 0,
- $dstSize['width'], $dstSize['height'],
- $srcWith, $srcHeight
- );
-
- return @imagepng( $srcPath, $ dstPath);
- }
-
- プライベート関数 _imageCreateFromBMP($filePath)
- {
- $fileHandle = fopen($filePath, 'rb');
- if (empty($fileHandle)) {
- return false;
- }
-
- $file = unpack(
- 'vfile_type/Vfile_size/Vreserved/Vbitmap_offset',
- fread($fileHandle, 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($fileHandle, 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($fileHandle, $bmp['colors'] * 4)
- );
- }
- $image = fread($fileHandle, $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) {
- $color = unpack(' V', substr($image, $p, 3) . $vide);
- } else if ($bmp['bits_per_pixel'] == 16) {
- $color = unpack('n', substr ($image, $p, 2));
- $color[1] = $palette[$color[1]+1];
- } else if ($bmp['bits_per_pixel'] == 8) {
- $color = unpack(' n', $vide . substr ($image, $p, 1));
- $color[1] = $palette[$color[1]+1];
- } else if ($bmp[' bits_per_pixel'] = =4) {
- $color = unpack('n', $vide .substr($image, 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];
- }else if ($bmp['bits_per_pixel'] == 1) {
- $color = unpack('n', $vide . substr($image, Floor($p), 1));
- switch (($p * 8) % 8) {
- case 0:
- $color[1] = ($color[1] >> 7);
- Break;
- case 1:
- $color[1] = ($color[1] & 0x40) >> 6;
- ブレーク;
- ケース 2:
- $color[1] = ($color[1] & 0x20) >> 5;
- ブレーク;
- ケース 3:
- $color[1] = ($color[1] & 0x10) >> 4;
- ブレーク;
- ケース 4:
- $color[1] = ($color[1] & 0x8) >> 3;
- ブレーク;
- ケース 5:
- $color[1] = ($color[1] & 0x4) >> 2;
- ブレーク;
- ケース 6:
- $color[1] = ($color[1] & 0x2) >> 1;
- ブレーク;
- ケース 7:
- $color[1] = ($color[1] & 0x1);
- ブレーク;
- }
- $color[1] = $palette[$color[1] + 1];
- } else {
- return false;
- }
- imagesetpixel($res, $x, $y, $color[1]);
- $x++;
- $p += $bmp['bytes_per_pixel'];
- }
- $ y--;
- $p += $bmp['decal'];
- }
- fclose($fileHandle);
- return $res;
- }
-
- プライベート関数 _getDstSize($srcWith, $srcHeight, $dstWidth, $dstHeight )
- {
- $size = array('width' => $srcWith, 'height' => $srcHeight);
- if ($dstWidth > 0 && $dstHeight > 0) {
- if ($srcWith > ; 0 && $srcHeight > 0) {
- if ($srcWith / $srcHeight >= $dstWidth / $dstHeight) {
- if ($srcWith > $dstWidth) {
- $size['width'] = $dstWidth ;
- $size['height'] = $srcHeight * $dstWidth / $srcWith;
- }
- } else {
- if ($srcHeight >; $dstHeight) {
- $size['width'] = $srcWith * $dstHeight / $srcHeight;
- $size['height'] = $dstHeight;
- }
- }
- }
- }
- return $size;
- }
- }
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