chore: use `sharp` to generate images (#7512)

- `tools/generate-images.js` is used to convert SVGs to resized optimized SVGs and resized optimized PNG. Although it would be best to drop generating images from SVG, the usage of these images do not accept a SVG.
- The script relied on two dependencies being installed on-the-fly, this is suboptimal as it means its integrity was not saved in package-lock.json and no specific version was specified which makes reproducible builds harder. `imagemin-zopfli` was not updated in 4 years and seems to use dependency that generate funny message about memory leaks and using no longer maintained dependencies.
- Use [`sharp`](https://sharp.pixelplumbing.com/) to do the image conversion, this installs two binaries on Linux (glibc/musl) and are responsible for 5% of the `node_modules` directory size. Add this to package.json as a dev dependencies to ensure the integrity can be verified and help reproducible builds.
- Drop the `gitea` conversion, I cannot find this being used within Forgejo (my best guess is that e20cd83bc5479bd76ff1a248f0e28ef0bea6742b dropped the usage of it).
- Resolves forgejo/forgejo#7232

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7512
Reviewed-by: 0ko <[e-mail]>
Reviewed-by: Michael Kriese <[e-mail]>
Co-authored-by: Gusted <[e-mail]>
Co-committed-by: Gusted <[e-mail]>

Makefile

···
 
 .PHONY: generate-images
 generate-images: | node_modules
-	npm install --no-save fabric@6 imagemin-zopfli@7
-	node tools/generate-images.js $(TAGS)
+	node tools/generate-images.js
 
 .PHONY: generate-manpage
 generate-manpage:

package-lock.json

···
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         "postcss-html": "1.8.0",
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         "stylelint": "16.17.0",
         "stylelint-declaration-block-no-ignored-properties": "2.8.0",
         "stylelint-declaration-strict-value": "1.10.11",
···
         "url": "https://github.com/sponsors/sindresorhus"
       }
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+        "color": "^4.2.3",
+        "detect-libc": "^2.0.3",
+        "semver": "^7.7.1"
+      },
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-darwin-arm64": "0.34.1",
+        "@img/sharp-darwin-x64": "0.34.1",
+        "@img/sharp-libvips-darwin-arm64": "1.1.0",
+        "@img/sharp-libvips-darwin-x64": "1.1.0",
+        "@img/sharp-libvips-linux-arm": "1.1.0",
+        "@img/sharp-libvips-linux-arm64": "1.1.0",
+        "@img/sharp-libvips-linux-ppc64": "1.1.0",
+        "@img/sharp-libvips-linux-s390x": "1.1.0",
+        "@img/sharp-libvips-linux-x64": "1.1.0",
+        "@img/sharp-libvips-linuxmusl-arm64": "1.1.0",
+        "@img/sharp-libvips-linuxmusl-x64": "1.1.0",
+        "@img/sharp-linux-arm": "0.34.1",
+        "@img/sharp-linux-arm64": "0.34.1",
+        "@img/sharp-linux-s390x": "0.34.1",
+        "@img/sharp-linux-x64": "0.34.1",
+        "@img/sharp-linuxmusl-arm64": "0.34.1",
+        "@img/sharp-linuxmusl-x64": "0.34.1",
+        "@img/sharp-wasm32": "0.34.1",
+        "@img/sharp-win32-ia32": "0.34.1",
+        "@img/sharp-win32-x64": "0.34.1"
+      }
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
···
       "engines": {
         "node": ">=12"
       }
+    },
+    "node_modules/simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha512-JA//kQgZtbuY83m+xT+tXJkmJncGMTFT+C+g2h2R9uxkYIrE2yy9sgmcLhCnw57/WSD+Eh3J97FPEDFnbXnDUg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "is-arrayish": "^0.3.1"
+      }
+    },
+    "node_modules/simple-swizzle/node_modules/is-arrayish": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+      "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/slash": {
       "version": "3.0.0",

package.json

···
     "license-checker-rseidelsohn": "4.4.2",
     "markdownlint-cli": "0.44.0",
     "postcss-html": "1.8.0",
+    "sharp": "0.34.1",
     "stylelint": "16.17.0",
     "stylelint-declaration-block-no-ignored-properties": "2.8.0",
     "stylelint-declaration-strict-value": "1.10.11",

public/assets/img/gitea.svg

···
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 212 212" width="32" height="32"><style>circle,path{fill:none;stroke:#000;stroke-width:15}path{stroke-width:25}.orange{stroke:#f60}.red{stroke:#d40000}</style><g transform="translate(6 6)"><path d="M58 168V70a50 50 0 0 1 50-50h20" class="orange"/><path d="M58 168v-30a50 50 0 0 1 50-50h20" class="red"/><circle cx="142" cy="20" r="18" class="orange"/><circle cx="142" cy="88" r="18" class="red"/><circle cx="58" cy="180" r="18" class="red"/></g></svg>

routers/install/routes_test.go

···
 	assert.Equal(t, 404, w.Code)
 
 	w = httptest.NewRecorder()
-	req = httptest.NewRequest("GET", "/assets/img/gitea.svg", nil)
+	req = httptest.NewRequest("GET", "/assets/img/forgejo.svg", nil)
 	r.ServeHTTP(w, req)
 	assert.Equal(t, 200, w.Code)
 }

tools/generate-images.js

···
-#!/usr/bin/env node
-import imageminZopfli from 'imagemin-zopfli'; // eslint-disable-line import-x/no-unresolved
-import {loadSVGFromString, Canvas, Rect, util} from 'fabric/node'; // eslint-disable-line import-x/no-unresolved
 import {optimize} from 'svgo';
 import {readFile, writeFile} from 'node:fs/promises';
-import {argv, exit} from 'node:process';
+import {exit} from 'node:process';
+import SharpConstructor from 'sharp';
+import {fileURLToPath} from 'node:url';
 
 function doExit(err) {
   if (err) console.error(err);
···
     return;
   }
 
-  const {objects, options} = await loadSVGFromString(svg);
-  const canvas = new Canvas();
-  canvas.setDimensions({width: size, height: size});
-  const ctx = canvas.getContext('2d');
-  ctx.scale(options.width ? (size / options.width) : 1, options.height ? (size / options.height) : 1);
-
+  let sharp = (new SharpConstructor(Buffer.from(svg))).resize(size, size).png({compressionLevel: 9, palette: true, effort: 10, quality: 80});
   if (bg) {
-    canvas.add(new Rect({
-      left: 0,
-      top: 0,
-      height: size * (1 / (size / options.height)),
-      width: size * (1 / (size / options.width)),
-      fill: 'white',
-    }));
-  }
-
-  canvas.add(util.groupSVGElements(objects, options));
-  canvas.renderAll();
-
-  let png = Buffer.from([]);
-  for await (const chunk of canvas.createPNGStream()) {
-    png = Buffer.concat([png, chunk]);
+    sharp = sharp.flatten({background: 'white'});
   }
-
-  png = await imageminZopfli({more: true})(png);
-  await writeFile(outputFile, png);
+  sharp.toFile(fileURLToPath(outputFile), (err) => err !== null && console.error(err) && exit(1));
 }
 
 async function main() {
-  const gitea = argv.slice(2).includes('gitea');
   const logoSvg = await readFile(new URL('../assets/logo.svg', import.meta.url), 'utf8');
   const faviconSvg = await readFile(new URL('../assets/favicon.svg', import.meta.url), 'utf8');
 
···
     generate(faviconSvg, '../public/assets/img/favicon.png', {size: 180}),
     generate(logoSvg, '../public/assets/img/avatar_default.png', {size: 200}),
     generate(logoSvg, '../public/assets/img/apple-touch-icon.png', {size: 180, bg: true}),
-    gitea && generate(logoSvg, '../public/assets/img/gitea.svg', {size: 32}),
   ]);
 }