画像パーシングライブラリーの追加
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254
src/Site/Lib/Image.php
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254
src/Site/Lib/Image.php
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<?php
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namespace Site\Lib;
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class RGB {
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public int $r;
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public int $g;
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public int $b;
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public array $rgb;
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public function __construct(int $r, int $g, int $b) {
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$this->r = $r;
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$this->g = $g;
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$this->b = $b;
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$this->rgb = [$r, $g, $b];
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}
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}
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class Image {
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public string $filename = 'UNKNOWN';
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public string $extension = 'UNKNOWN';
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public string $type = 'UNSUPPORTED';
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public int $width = 0;
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public int $height = 0;
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public int $bpp = 0;
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public int $bitDepth = 0;
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public int $numColors = 0; // GIF, PNG
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public int $colorType = 0; // PNG
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public string $compression = 'NONE'; // GIF, PNG
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public int $filter = 0; // PNG
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public int $interlace = 0; // GIF, PNG
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public bool $hasAlpha = false;
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public int $bgColor = 0; // GIF
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public float $delayTime = 0; // GIF
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public array $globalColorTable = []; // GIF
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public int $numTransparentPixels = 0; // GIF
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public int $lzwMinCodeSize = 0; // GIF
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public string $imageData = '';
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public string $size = '0 B';
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public int $bytes = 0;
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public \stdClass $fullInfo;
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public function __construct(string $file) {
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$file = ROOT.$file;
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// $file = ROOT.'/public/static/article/mock-screenshot.jpg';
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if (!file_exists($file)) return;
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$fp = fopen($file, 'rb');
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if (!$fp) return;
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$extBytes = fread($fp, 15);
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fclose($fp);
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$this->bytes = filesize($file);
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$this->size = $this->formatBytes($this->bytes);
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$this->extension = pathinfo($file, PATHINFO_EXTENSION);
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$this->filename = str_replace('.'.$this->extension, '', array_last(explode('/', $file)));
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if ($extBytes === false) return;
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else if (substr($extBytes, 0, 3) === "\xff\xd8\xff") {
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$this->type = 'image/jpeg';
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$this->parseJPEG($file);
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} else if (substr($extBytes, 0, 15) === "\x52\x49\x46\x46\x1a\x28\x00\x00\x57\x45\x42\x50\x56\x50\x38") {
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$this->type = 'image/webp';
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// $this->parseWEBP($file);
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} else if (substr($extBytes, 0, 3) === "\x42\x4d\x36") {
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$this->type = 'image/bmp';
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// $this->parseBMP($file);
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} else if (substr($extBytes, 0, 6) === "\x89\x50\x4e\x47\x0d\x0a") {
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$this->type = 'image/png';
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$this->fullInfo = $this->parsePNG($file);
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} else if (substr($extBytes, 0, 6) === "\x47\x49\x46\x38\x37\x61" || substr($extBytes, 0, 6) === "\x47\x49\x46\x38\x39\x61") {
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$this->type = 'image/gif';
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$this->fullInfo = $this->parseGIF($file);
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} else if (str_ends_with($file, '.tga')) {
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$this->type = 'image/tga';
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// $this->parseTGA($file);
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}
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}
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private function parseJPEG(string $file): \stdClass {
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$jpg = new \stdClass;
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$fp = fopen($file, 'rb');
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$i = 0;
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while (!feof($fp)) {
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$byte = fread($fp, 1);
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if ($byte !== "\xFF") continue;
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$marker = ord(fread($fp, 1));
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if ($marker >= 0xC0 && $marker <= 0xC3) { // 0xC0 = SOF0, 0xC1 = SOF1, 0xC2 = SOF2, 0xC3 = SOF3
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fread($fp, 2);
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$this->bpp = ord(fread($fp, 1));
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// n = ビッグエンディアン（2ビット）
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$this->height = unpack('n', fread($fp, 2))[1];
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$this->width = unpack('n', fread($fp, 2))[1];
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$jpg->width = $this->width;
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$jpg->height = $this->height;
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$jpg->bpp = $this->bpp;
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} else if ($marker == 0xC4) { // DHT (Huffmanテーブル（複数可）)
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//
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} else if ($marker == 0xDB) { // DQT (量子化テーブル（複数可）)
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//
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} else if ($marker == 0xDD) { // DRI (リセット期間)
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} else if ($marker == 0xDA) { // SOS（画像開始）
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} else if ($marker >= 0xD0 && $marker <= 0xD7) { // RST
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} else if ($marker >= 0xE1 && $marker <= 0xEF) { // APP
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} else if ($marker == 0xFE) { // COM
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} else if ($marker == 0xD9) { // EOI（画像終了）
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break;
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}
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}
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// kys($jpg);
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$i++;
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fclose($fp);
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return $jpg;
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}
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/**
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* TODO: 現在、IHDRヘッダーのみを受け取る
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*/
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private function parsePNG(string $file): \stdClass {
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$png = new \stdClass();
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$fp = fopen($file, 'rb');
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fread($fp, 8); // マジックのスキップ
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unpack('N', fread($fp, 4))[1];
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$type = fread($fp, 4);
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if ($type !== 'IHDR') {
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fclose($fp);
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return $png;
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}
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// IHDRデータ
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$data = fread($fp, 13);
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// N = ビッグエンディアン（4ビット）
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$this->width = unpack('N', substr($data, 0, 4))[1];
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$this->height = unpack('N', substr($data, 4, 4))[1];
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$this->bitDepth = ord($data[8]);
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$this->numColors = 1 << $this->bitDepth;
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$this->colorType = ord($data[9]);
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$this->compression = 'DEFLATE';
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$this->filter = ord($data[11]);
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$this->interlace = ord($data[12]); // 0 = なし, 1 = Adam7
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$this->bpp = $this->bitDepth * $this->getSamplesPerPixel($this->colorType);
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$this->delayTime = 0;
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$this->hasAlpha = ($this->colorType === 4 || $this->colorType === 6);
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$png->width = $this->width;
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$png->height = $this->height;
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$png->bitDepth = $this->bitDepth;
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$png->numColors = $this->numColors;
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$png->colorType = $this->colorType;
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$png->compression = $this->compression;
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$png->filter = $this->filter;
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$png->interlace = $this->interlace;
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$png->bpp = $this->bpp;
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$png->delayTime = $this->delayTime;
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$png->hasAlpha = $this->hasAlpha;
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fclose($fp);
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return $png;
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}
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/**
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* TODO: 現在、インタレースした画像が未対応です。
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*/
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private function parseGIF(string $file): \stdClass {
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$gif = new \stdClass();
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$fp = fopen($file, 'rb');
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$magic = fread($fp, 6); // マジックのスキップ
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// v = リトルエンディアン（2ビット）
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$this->width = unpack('v', fread($fp, 2))[1];
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$this->height = unpack('v', fread($fp, 2))[1];
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$packed = ord(fread($fp, 1));
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$this->bitDepth = ($packed & 0x07) + 1;
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$this->numColors = 1 << $this->bitDepth;
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$hasGct = $this->bitDepth === 8;
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$gif->width = $this->width;
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$gif->height = $this->height;
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$gif->bitDepth = $this->bitDepth;
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$gif->numColors = $this->numColors;
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if ($magic === 'GIF87a' || !$hasGct) return $gif; // それ以外情報がない
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$this->bgColor = (int)bin2hex(fread($fp, 1));
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$gif->bgColor = $this->bgColor;
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bin2hex(fread($fp, 1)); // いつでも 0:0？
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$gceLen = 0;
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while (!feof($fp)) {
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$skip = bin2hex(fread($fp, 3));
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$color = new RGB((int)($skip[0].$skip[1]), (int)($skip[2].$skip[3]), (int)($skip[4].$skip[5]));
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$this->globalColorTable[] = $color->rgb;
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if ($skip[0].$skip[1] === '21' && $skip[2].$skip[3] === 'f9') {
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$gceLen = (int)($skip[4].$skip[5]);
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break;
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}
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}
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// GCE開始
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$this->hasAlpha = (ord(fread($fp, 1)) & 0x01) === 0x01;
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$this->delayTime = (unpack('v', fread($fp, 2))[1]) / 100.0;
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$this->numTransparentPixels = ord(fread($fp, 1));
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$gif->hasAlpha = $this->hasAlpha;
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$gif->delayTime = $this->delayTime;
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$gif->numTransparentPixels = $this->numTransparentPixels;
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fread($fp, 1); // GCE終了
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fread($fp, 1); // 画像指定子開始
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fread($fp, 4); // 画面のXとY、いつでも(0, 0)
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fread($fp, 4); // 画像のサイズ、関数の開始で既に保存した
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$pack = ord(fread($fp, 1));
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$this->interlace = ($pack & 0x40); // 画像のサイズ、関数の開始で既に保存した
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$this->lzwMinCodeSize = ord(fread($fp, 1)); // 画像データ開始
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$gif->lzwMinCodeSize = $this->lzwMinCodeSize;
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$imageData = '';
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while (true) {
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$blockSize = ord(fread($fp, 1));
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if ($blockSize === 0) break;
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$imageData .= fread($fp, 1);
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}
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$this->imageData = base64_encode($imageData);
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$this->colorType = 3;
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$this->compression = 'LZW';
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$gif->colorType = $this->colorType;
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$gif->compression = $this->compression;
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$gif->globalColorTable = $this->globalColorTable;
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$gif->imageData = $this->imageData;
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fclose($fp);
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return $gif;
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}
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private function formatBytes(int $size, int $precision = 2): string {
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$units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
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for ($i = 0; $size > 1024 && $i < count($units) - 1; ++$i) $size /= 1024;
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return round($size, $precision).' '.$units[$i];
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}
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private function getSamplesPerPixel(int $colorType): int {
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return match($colorType) {
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0 => 1, // グレースケール
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2 => 3, // RGB
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3 => 1, // 指標した色（ペレット）
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4 => 2, // グレースケール＋アルファ
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6 => 4, // RGBA
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default => 1,
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};
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}
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}
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