複数ネームスペースを可能に

src/Std/Lib/Image.php

@@ -0,0 +1,79 @@
+<?php
+namespace Std\Lib;
+
+use Std\Lib\Image\ImageInterface;
+use Std\Lib\Image\Gif;
+use Std\Lib\Image\Jpeg;
+use Std\Lib\Image\Png;
+use Std\Lib\Image\Targa;
+
+class RGB {
+  public int $r;
+  public int $g;
+  public int $b;
+  public array $rgb;
+
+  public function __construct(int $r, int $g, int $b) {
+    $this->r = $r;
+    $this->g = $g;
+    $this->b = $b;
+    $this->rgb = ['r' => $r, 'g' => $g, 'b' => $b];
+  }
+}
+
+class Image {
+  public string $filename = 'UNKNOWN';
+  public string $extension = 'UNKNOWN';
+  public string $type = 'UNSUPPORTED';
+  public string $size = '0 B';
+  public int $bytes = 0;
+  public \stdClass $fullInfo;
+
+  private array $supported = [
+    'image/gif'  => Gif::class,
+    'image/jpeg' => Jpeg::class,
+    'image/png'  => Png::class,
+    'image/x-tga'  => Targa::class,
+  ];
+
+  public function __construct(string $file) {
+    $file = ROOT.$file;
+    // $file = ROOT.'/public/static/article/mock-screenshot.tga';
+    if (!file_exists($file)) return;
+    $fp = fopen($file, 'rb');
+    if (!$fp) return;
+    $extBytes = fread($fp, 15);
+    fclose($fp);
+
+    $this->bytes = filesize($file);
+    $this->size = $this->formatBytes($this->bytes);
+    $this->extension = pathinfo($file, PATHINFO_EXTENSION);
+    $this->filename = str_replace('.'.$this->extension, '', array_last(explode('/', $file)));
+
+    if (substr($extBytes, 0, 3)  === "\xff\xd8\xff") $this->type = 'image/jpeg';
+    else if (substr($extBytes, 0, 15) === "\x52\x49\x46\x46\x1a\x28\x00\x00\x57\x45\x42\x50\x56\x50\x38") $this->type = 'image/webp';
+    else if (substr($extBytes, 0, 3)  === "\x42\x4d\x36") $this->type = 'image/bmp';
+    else if (substr($extBytes, 0, 6)  === "\x89\x50\x4e\x47\x0d\x0a") $this->type = 'image/png';
+    else if (substr($extBytes, 0, 6)  === "\x47\x49\x46\x38\x37\x61" || substr($extBytes, 0, 6)  === "\x47\x49\x46\x38\x39\x61") $this->type = 'image/gif';
+    else if (str_ends_with($file, '.tga')) $this->type = 'image/x-tga';
+    
+    $this->fullInfo = $this->createHandler($this->type)->parse($file);
+    $this->fullInfo->type = $this->type;
+    $this->fullInfo->size = $this->size;
+    $this->fullInfo->bytes = $this->bytes;
+  }
+
+  ///////////////
+
+  private function createHandler(string $ext): ImageInterface {
+    $class = $this->supported[$ext] ?? null;
+    if (!$class) throw new \RuntimeException("形式のハンドルが存在しない： {$ext}");
+    return new $class();
+  }
+
+  private function formatBytes(int $size, int $precision = 2): string {
+    $units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
+    for ($i = 0; $size > 1024 && $i < count($units) - 1; ++$i) $size /= 1024;
+    return round($size, $precision).' '.$units[$i];
+  }
+}