suwako / LittleBeast

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LittleBeast / src / Std / Lib / Image.php
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1<?php
2/*************************************************************
3# 076 License
4
5Copyright (c) テクニカル諏訪子
6
7Permission is hereby granted to any person obtaining a copy of the software
8Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
9sublicense, and/or sell copies of the Software, subject to the following conditions:
10
11 1. **Origin Attribution**:
12 - You must not misrepresent the origin of the Software; you must not claim
13 you created the original Software.
14 - If the Software is used in a product, you must either:
15 a. Provide clear attribution in the product's documentation, user interface,
16 or other visible areas, **OR**
17 b. Pay the original developers a fee they specify in writing.
18 2. **Usage Restriction**:
19 - The Software, or any derivative works, dependencies, or libraries
20 incorporating it, must not be used for censorship or to suppress freedom of
21 speech, expression, or creativity. Prohibited uses include, but are not
22 limited to:
23 - Censorship of so-called "hate speech", visuals, non-mainstream opinions,
24 ideas, or objective reality.
25 - Tools or systems designed to restrict access to information or
26 artistic works.
27 3. **Notice Preservation**:
28 - This license and the above copyright notice must remain intact in all copies
29 of the source code.
30
31THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
32INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
33PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
34HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
35CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
36OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38namespace Std\Lib;
39
40use Std\Lib\Image\ImageInterface;
41use Std\Lib\Image\Bitmap;
42use Std\Lib\Image\Bmp;
43use Std\Lib\Image\Gif;
44use Std\Lib\Image\Jpeg;
45use Std\Lib\Image\Png;
46use Std\Lib\Image\Targa;
47use Std\Lib\Image\Webp;
48
49class RGB {
50 public int $r;
51 public int $g;
52 public int $b;
53 public array $rgb;
54
55 public function __construct(int $r, int $g, int $b) {
56 $this->r = $r;
57 $this->g = $g;
58 $this->b = $b;
59 $this->rgb = ['r' => $r, 'g' => $g, 'b' => $b];
60 }
61}
62
63class Image {
64 public string $filename = 'UNKNOWN';
65 public string $extension = 'UNKNOWN';
66 public string $type = 'UNSUPPORTED';
67 public string $size = '0 B';
68 public int $bytes = 0;
69 public \stdClass $fullInfo;
70
71 private const SUPPORTED = [
72 'image/bmp' => Bmp::class,
73 'image/gif' => Gif::class,
74 'image/jpeg' => Jpeg::class,
75 'image/png' => Png::class,
76 'image/webp' => Webp::class,
77 'image/x-tga' => Targa::class,
78 ];
79
80 public function __construct(string $file) {
81 // ファイルが無くてもfullInfoを読める様に（以前は未初期化のままで、記事のサムネイルが無いとページが落ちた）
82 $this->fullInfo = (object)['type' => $this->type, 'size' => $this->size, 'bytes' => 0, 'width' => 0, 'height' => 0];
83 $file = ROOT.$file;
84 // $file = ROOT.'/public/static/article/mock-screenshot.tga';
85 if (!file_exists($file)) return;
86 $fp = fopen($file, 'rb');
87 if (!$fp) return;
88 $extBytes = (string)fread($fp, 32);
89 fclose($fp);
90
91 $this->bytes = filesize($file);
92 $this->size = $this->formatBytes($this->bytes);
93 $this->extension = pathinfo($file, PATHINFO_EXTENSION);
94 $this->filename = str_replace('.'.$this->extension, '', array_last(explode('/', $file)));
95
96 $this->type = self::detect($extBytes, $file) ?? 'UNSUPPORTED';
97
98 $this->fullInfo = self::handler($this->type)->parse($file);
99 $this->fullInfo->type = $this->type;
100 $this->fullInfo->size = $this->size;
101 $this->fullInfo->bytes = $this->bytes;
102 if (!isset($this->fullInfo->width) && isset($this->fullInfo->header->width)) {
103 $this->fullInfo->width = $this->fullInfo->header->width;
104 $this->fullInfo->height = $this->fullInfo->header->height;
105 }
106 }
107
108 /**
109 * ファイルの先頭から形式を判断する（TGAは印が無いので、ファイル名が「.tga」の場合だけ）
110 *
111 * @param string $head ファイルの先頭（32バイト以上）
112 * @param string $name ファイル名（TGA用、任意）
113 * @return string|null MIME、分からなければnull
114 */
115 public static function detect(string $head, string $name = ''): ?string {
116 if (str_starts_with($head, "\xff\xd8\xff")) return 'image/jpeg';
117 if (str_starts_with($head, "\x89PNG\r\n\x1a\n")) return 'image/png';
118 if (str_starts_with($head, 'GIF87a') || str_starts_with($head, 'GIF89a')) return 'image/gif';
119 if (str_starts_with($head, 'RIFF') && substr($head, 8, 4) === 'WEBP') return 'image/webp';
120 // BMP：「BM」と、知っているヘッダーの大きさ
121 if (str_starts_with($head, 'BM') && strlen($head) >= 18 && in_array(unpack('V', substr($head, 14, 4))[1], [12, 16, 40, 52, 56, 64, 108, 124], true)) return 'image/bmp';
122 if (str_ends_with(strtolower($name), '.tga')) return 'image/x-tga';
123 return null;
124 }
125
126 /**
127 * ファイルの中身を画素にする
128 *
129 * @param string $data ファイルの中身
130 * @param string $name ファイル名（TGA用、任意）
131 * @return Bitmap
132 * @throws \RuntimeException 未対応の形式又は壊れたファイル
133 */
134 public static function decode(string $data, string $name = ''): Bitmap {
135 return self::handler(self::detect($data, $name) ?? '')->decode($data);
136 }
137
138 /**
139 * 画素をファイルの中身にする
140 *
141 * @param string $type MIME（image/png等）
142 * @param array $opt 形式毎の設定（PNG：level、JPEG：quality等）
143 */
144 public static function encode(Bitmap $img, string $type, array $opt = []): string {
145 return self::handler($type)->encode($img, $opt);
146 }
147
148 ///////////////
149
150 private static function handler(string $type): ImageInterface {
151 $class = self::SUPPORTED[$type] ?? null;
152 if (!$class) throw new \RuntimeException("形式のハンドルが存在しない： {$type}");
153 return new $class();
154 }
155
156 private function formatBytes(int $size, int $precision = 2): string {
157 $units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
158 for ($i = 0; $size > 1024 && $i < count($units) - 1; ++$i) $size /= 1024;
159 return round($size, $precision).' '.$units[$i];
160 }
161}