init template

src/scripts/split-sprites.mjs

@@ -0,0 +1,81 @@
+import sharp from 'sharp';
+import { resolve, basename, extname, join, dirname } from 'path';
+import { existsSync, mkdirSync, readdirSync, statSync } from 'fs';
+import { fileURLToPath } from 'url';
+
+const PROJECT_ROOT = resolve(fileURLToPath(import.meta.url), '../../..');
+const DEFAULT_INPUT = resolve(PROJECT_ROOT, 'assets/items');
+const DEFAULT_OUTPUT = resolve(PROJECT_ROOT, 'assets/icons');
+const GRID = 4;
+const SUPPORTED_EXTENSIONS = /\.(jpe?g|png|webp|tiff?)$/i;
+
+async function splitSpriteSheet(filePath, outputDir) {
+  const name = basename(filePath, extname(filePath));
+
+  const { width, height } = await sharp(filePath).metadata();
+  const cellWidth = Math.floor(width / GRID);
+  const cellHeight = Math.floor(height / GRID);
+
+  const tasks = [];
+
+  for (let row = 0; row < GRID; row++) {
+    for (let col = 0; col < GRID; col++) {
+      const left = col * cellWidth;
+      const top = row * cellHeight;
+      const outputPath = join(outputDir, `${name}-${row}-${col}.png`);
+
+      tasks.push(
+        sharp(filePath)
+          .extract({ left, top, width: cellWidth, height: cellHeight })
+          .png()
+          .toFile(outputPath)
+          .then(() => outputPath)
+      );
+    }
+  }
+
+  return Promise.all(tasks);
+}
+
+function collectFiles(input) {
+  if (statSync(input).isFile()) {
+    return [input];
+  }
+  return readdirSync(input)
+    .filter(f => SUPPORTED_EXTENSIONS.test(f))
+    .map(f => join(input, f));
+}
+
+async function main() {
+  const input = resolve(process.argv[2] || DEFAULT_INPUT);
+  const outputDir = resolve(process.argv[3] || DEFAULT_OUTPUT);
+
+  if (!existsSync(input)) {
+    console.error(`Not found: ${input}`);
+    process.exit(1);
+  }
+
+  mkdirSync(outputDir, { recursive: true });
+
+  const files = collectFiles(input);
+
+  if (files.length === 0) {
+    console.error(`No image files found in: ${input}`);
+    process.exit(1);
+  }
+
+  console.log(`Processing ${files.length} sprite sheet(s)...`);
+
+  const allResults = await Promise.all(
+    files.map(async (filePath) => {
+      const results = await splitSpriteSheet(filePath, outputDir);
+      console.log(`  ${basename(filePath)} -> ${results.length} images`);
+      return results;
+    })
+  );
+
+  const totalImages = allResults.reduce((sum, r) => sum + r.length, 0);
+  console.log(`Done. ${totalImages} images saved to ${outputDir}`);
+}
+
+main();