app icon

make-square-icon.js

@@ -0,0 +1,66 @@
+const sharp = require("sharp");
+const { spawnSync } = require("child_process");
+
+async function resizeAndMakeWhiteTransparent(inputPath, outputPath) {
+  const whiteThreshold = 250; // treat >= as white
+  const img = sharp(inputPath).ensureAlpha();
+
+  // Get metadata to compute resize dimensions preserving aspect ratio
+  const meta = await img.metadata();
+  const origW = meta.width || 0;
+  const origH = meta.height || 0;
+  if (!origW || !origH) throw new Error("Unable to read image dimensions");
+
+  const targetW = Math.max(origW, origH);
+  const targetH = Math.max(origW, origH);
+
+  // Resize and output raw RGBA buffer
+  const { data, info } = await img
+    .resize(targetW, targetH, { fit: "fill" })
+    .raw()
+    .toBuffer({ resolveWithObject: true });
+
+  const { width: w, height: h, channels } = info; // channels should be 4 (RGBA)
+  if (channels < 3) throw new Error("Unexpected channel count");
+
+  console.log(targetH, targetW, info);
+
+  // Modify alpha for near-white pixels
+  for (let i = 0; i < data.length; i += channels) {
+    const r = data[i];
+    const g = data[i + 1];
+    const b = data[i + 2];
+    const a = channels === 4 ? data[i + 3] : 255;
+
+    if (
+      a > 0 &&
+      r >= whiteThreshold &&
+      g >= whiteThreshold &&
+      b >= whiteThreshold
+    ) {
+      if (channels === 4) data[i + 3] = 0;
+      else {
+        // expand to RGBA if input lacked alpha
+        // create a new buffer would be required; throw for simplicity
+        throw new Error(
+          "Input image missing alpha channel; ensure ensureAlpha() was applied.",
+        );
+      }
+    }
+  }
+
+  // Recreate and save PNG
+  await sharp(data, { raw: { width: w, height: h, channels } })
+    .png({ compressionLevel: 9 })
+    .toFile(outputPath);
+}
+
+const [, , input] = process.argv;
+if (!input) {
+  throw new Error(`Input is required: input=${input}`);
+}
+
+// Example usage
+resizeAndMakeWhiteTransparent(input, "app-icon.png")
+  .then(() => spawnSync("pnpm tauri icon", { shell: true, stdio: "inherit" }))
+  .catch((err) => console.error(err));