diff --git a/bench.js b/bench.js
new file mode 100644
index 0000000..0c096b7
--- /dev/null
+++ b/bench.js
@@ -0,0 +1,27 @@
+import TinySDF from './index.js';
+import nodeCanvas from 'canvas';
+
+
+class MockTinySDF extends TinySDF {
+    _createCanvas(size) {
+        return nodeCanvas.createCanvas(size, size);
+    }
+}
+
+const sdf = new MockTinySDF({
+    fontSize: 48,
+    buffer: 3
+});
+
+// warmup
+for (let i = 0; i < 1000; ++i) {
+    sdf.draw('@');
+}
+
+const N = 1e4;
+const start = performance.now();
+for (let i = 0; i < N; ++i) {
+    sdf.draw('@');
+}
+console.log(`${N} iterations took ${Math.round(performance.now() - start)} ms`);
+
diff --git a/index.js b/index.js
index 4e2f604..17e8be4 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,13 @@
 const INF = 1e20;
 
+// lookup table for gamma-corrected, signed squared alpha distance values
+const alphaTable = new Float64Array(256);
+for (let i = 0; i < 256; i++) {
+    const d = 0.5 - Math.pow(i / 255, 1 / 2.2);
+    alphaTable[i] = d * Math.abs(d);
+}
+alphaTable[255] = -INF;
+
 export default class TinySDF {
     constructor({
         fontSize = 24,
@@ -11,10 +19,10 @@ export default class TinySDF {
         fontStyle = 'normal',
         lang = null
     } = {}) {
-        this.buffer = buffer;
-        this.cutoff = cutoff;
-        this.radius = radius;
-        this.lang = lang;
+        this.buffer = buffer; // padding around a glyph's bounding box
+        this.radius = radius; // how many pixels around the glyph edge are encoded as signed distances
+        this.cutoff = cutoff; // how much of the SDF byte range represents inside vs outside the edge
+        this.lang = lang; // language of the Canvas drawing context
 
         // make the canvas size big enough to both have the specified buffer around the glyph
         // for "halo", and account for some glyphs possibly being larger than their font size
@@ -28,7 +36,8 @@ export default class TinySDF {
         ctx.textAlign = 'left'; // Necessary so that RTL text doesn't have different alignment
         ctx.fillStyle = 'black';
 
-        // temporary arrays for the distance transform
+        // two grids of squared distances: one for the outside of the glyph shape, one for the inside;
+        // the signed distance is derived as sqrt(outer) - sqrt(inner)
         this.gridOuter = new Float64Array(size * size);
         this.gridInner = new Float64Array(size * size);
         this.f = new Float64Array(size);
@@ -37,6 +46,9 @@ export default class TinySDF {
     }
 
     _createCanvas(size) {
+        if (typeof OffscreenCanvas !== 'undefined') {
+            return new OffscreenCanvas(size, size);
+        }
         const canvas = document.createElement('canvas');
         canvas.width = canvas.height = size;
         return canvas;
@@ -51,14 +63,14 @@ export default class TinySDF {
             actualBoundingBoxRight
         } = this.ctx.measureText(char);
 
-        // The integer/pixel part of the top alignment is encoded in metrics.glyphTop
+        // The integer/pixel part of the alignment is encoded in metrics.glyphTop/glyphLeft
         // The remainder is implicitly encoded in the rasterization
         const glyphTop = Math.ceil(actualBoundingBoxAscent);
-        const glyphLeft = 0;
+        const glyphLeft = Math.floor(actualBoundingBoxLeft);
 
         // If the glyph overflows the canvas size, it will be clipped at the bottom/right
-        const glyphWidth = Math.max(0, Math.min(this.size - this.buffer, Math.ceil(actualBoundingBoxRight - actualBoundingBoxLeft)));
-        const glyphHeight = Math.min(this.size - this.buffer, glyphTop + Math.ceil(actualBoundingBoxDescent));
+        const glyphWidth = Math.max(0, Math.min(this.size - this.buffer, Math.ceil(actualBoundingBoxRight) - glyphLeft));
+        const glyphHeight = Math.max(0, Math.min(this.size - this.buffer, glyphTop + Math.ceil(actualBoundingBoxDescent)));
 
         const width = glyphWidth + 2 * this.buffer;
         const height = glyphHeight + 2 * this.buffer;
@@ -71,40 +83,39 @@ export default class TinySDF {
         const {ctx, buffer, gridInner, gridOuter} = this;
         if (this.lang) ctx.lang = this.lang;
         ctx.clearRect(buffer, buffer, glyphWidth, glyphHeight);
-        ctx.fillText(char, buffer, buffer + glyphTop);
+        ctx.fillText(char, buffer - glyphLeft, buffer + glyphTop);
         const imgData = ctx.getImageData(buffer, buffer, glyphWidth, glyphHeight);
 
-        // Initialize grids outside the glyph range to alpha 0
+        // default: outside the glyph (INF distance) for outer, inside (0 distance) for inner
         gridOuter.fill(INF, 0, len);
         gridInner.fill(0, 0, len);
 
+        // for anti-aliased pixels, treat partial coverage as a distance approximation:
+        // a fully covered pixel gets 0 outer / INF inner; a partial pixel gets a small
+        // non-zero outer or inner distance based on how far its coverage deviates from 0.5
+        let imgIdx = 3; // start at the alpha channel of the first pixel
         for (let y = 0; y < glyphHeight; y++) {
-            for (let x = 0; x < glyphWidth; x++) {
-                const a = imgData.data[4 * (y * glyphWidth + x) + 3] / 255; // alpha value
+            let j = (y + buffer) * width + buffer;
+            for (let x = 0; x < glyphWidth; x++, imgIdx += 4, j++) {
+                const a = imgData.data[imgIdx]; // alpha value
                 if (a === 0) continue; // empty pixels
-
-                const j = (y + buffer) * width + x + buffer;
-
-                if (a === 1) { // fully drawn pixels
-                    gridOuter[j] = 0;
-                    gridInner[j] = INF;
-
-                } else { // aliased pixels
-                    // gamma correction
-                    const aLin = Math.pow(a, 1.0 / 2.2);
-                    const d = 0.5 - aLin;
-                    gridOuter[j] = d > 0 ? d * d : 0;
-                    gridInner[j] = d < 0 ? d * d : 0;
-                }
+                const t = alphaTable[a];
+                gridOuter[j] = Math.max(0, t);
+                gridInner[j] = Math.max(0, -t);
             }
         }
 
         edt(gridOuter, 0, 0, width, height, width, this.f, this.v, this.z);
         edt(gridInner, buffer, buffer, glyphWidth, glyphHeight, width, this.f, this.v, this.z);
 
+        // encode signed distance as a byte: inside the glyph maps to high values, outside to low,
+        // with the edge gradient spanning [-radius * cutoff, radius * (1 - cutoff)] pixels around the edge;
+        // Uint8ClampedArray clamps beyond that
+        const scale = 255 / this.radius;
+        const base = 255 * (1 - this.cutoff);
         for (let i = 0; i < len; i++) {
             const d = Math.sqrt(gridOuter[i]) - Math.sqrt(gridInner[i]);
-            data[i] = Math.round(255 - 255 * (d / this.radius + this.cutoff));
+            data[i] = Math.round(base - scale * d);
         }
 
         return glyph;
diff --git a/package-lock.json b/package-lock.json
index 06fa37b..220dc71 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,27 +1,27 @@
 {
   "name": "@mapbox/tiny-sdf",
-  "version": "2.0.7",
+  "version": "2.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@mapbox/tiny-sdf",
-      "version": "2.0.7",
+      "version": "2.1.0",
       "license": "BSD-2-Clause",
       "devDependencies": {
-        "canvas": "^3.2.0",
-        "eslint": "^9.32.0",
+        "canvas": "^3.2.3",
+        "eslint": "^10.2.0",
         "eslint-config-mourner": "^4.1.0",
-        "eslint-plugin-html": "^8.1.3",
+        "eslint-plugin-html": "^8.1.4",
         "pixelmatch": "^7.1.0",
         "pngjs": "^7.0.0",
-        "st": "^3.0.2"
+        "st": "^3.0.3"
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.7.0",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.7.0.tgz",
-      "integrity": "sha512-dyybb3AcajC7uha6CvhdVRJqaKyn7w2YKqKyAN37NKYgZT36w+iRb0Dymmc5qEJ549c/S31cMMSFd75bteCpCw==",
+      "version": "4.9.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
+      "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -51,9 +51,9 @@
       }
     },
     "node_modules/@eslint-community/regexpp": {
-      "version": "4.12.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.1.tgz",
-      "integrity": "sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==",
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -61,71 +61,50 @@
       }
     },
     "node_modules/@eslint/config-array": {
-      "version": "0.21.0",
-      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.21.0.tgz",
-      "integrity": "sha512-ENIdc4iLu0d93HeYirvKmrzshzofPw6VkZRKQGe9Nv46ZnWUzcF1xV01dcvEg/1wXUR61OmmlSfyeyO7EvjLxQ==",
+      "version": "0.23.4",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.4.tgz",
+      "integrity": "sha512-lf19F24LSMfF8weXvW5QEtnLqW70u7kgit5e9PSx0MsHAFclGd1T9ynvWEMDT1w5J4Qt54tomGeAhdoAku1Xow==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@eslint/object-schema": "^2.1.6",
+        "@eslint/object-schema": "^3.0.4",
         "debug": "^4.3.1",
-        "minimatch": "^3.1.2"
+        "minimatch": "^10.2.4"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/config-helpers": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.3.0.tgz",
-      "integrity": "sha512-ViuymvFmcJi04qdZeDc2whTHryouGcDlaxPqarTD0ZE10ISpxGUVZGZDx4w01upyIynL3iu6IXH2bS1NhclQMw==",
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.5.4.tgz",
+      "integrity": "sha512-jJhqiY3wPMlWWO3370M86CPJ7pt8GmEwSLglMfQhjXal07RCvhmU0as4IuUEW5SJeunfItiEetHmSxCCe9lDBg==",
       "dev": true,
       "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^1.2.0"
+      },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/core": {
-      "version": "0.15.1",
-      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.15.1.tgz",
-      "integrity": "sha512-bkOp+iumZCCbt1K1CmWf0R9pM5yKpDv+ZXtvSyQpudrI9kuFLp+bM2WOPXImuD/ceQuaa8f5pj93Y7zyECIGNA==",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.2.0.tgz",
+      "integrity": "sha512-8FTGbNzTvmSlc4cZBaShkC6YvFMG0riksYWRFKXztqVdXaQbcZLXlFbSpC05s70sGEsXAw0qwhx69JiW7hQS7A==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@types/json-schema": "^7.0.15"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      }
-    },
-    "node_modules/@eslint/eslintrc": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.3.1.tgz",
-      "integrity": "sha512-gtF186CXhIl1p4pJNGZw8Yc6RlshoePRvE0X91oPGb3vZ8pM3qOS9W9NGPat9LziaBV7XrJWGylNQXkGcnM3IQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ajv": "^6.12.4",
-        "debug": "^4.3.2",
-        "espree": "^10.0.1",
-        "globals": "^14.0.0",
-        "ignore": "^5.2.0",
-        "import-fresh": "^3.2.1",
-        "js-yaml": "^4.1.0",
-        "minimatch": "^3.1.2",
-        "strip-json-comments": "^3.1.1"
-      },
-      "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      },
-      "funding": {
-        "url": "https://opencollective.com/eslint"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/js": {
-      "version": "9.32.0",
-      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.32.0.tgz",
-      "integrity": "sha512-BBpRFZK3eX6uMLKz8WxFOBIFFcGFJ/g8XuwjTHCqHROSIsopI+ddn/d5Cfh36+7+e5edVS8dbSHnBNhrLEX0zg==",
+      "version": "9.39.4",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.39.4.tgz",
+      "integrity": "sha512-nE7DEIchvtiFTwBw4Lfbu59PG+kCofhjsKaCWzxTpt4lfRjRMqG6uMBzKXuEcyXhOHoUp9riAm7/aWYGhXZ9cw==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -136,27 +115,27 @@
       }
     },
     "node_modules/@eslint/object-schema": {
-      "version": "2.1.6",
-      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.6.tgz",
-      "integrity": "sha512-RBMg5FRL0I0gs51M/guSAj5/e14VQ4tpZnQNWwuDT66P14I43ItmPfIZRhO9fUVIPOAQXU47atlywZ/czoqFPA==",
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-3.0.4.tgz",
+      "integrity": "sha512-55lO/7+Yp0ISKRP0PsPtNTeNGapXaO085aELZmWCVc5SH3jfrqpuU6YgOdIxMS99ZHkQN1cXKE+cdIqwww9ptw==",
       "dev": true,
       "license": "Apache-2.0",
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@eslint/plugin-kit": {
-      "version": "0.3.4",
-      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.3.4.tgz",
-      "integrity": "sha512-Ul5l+lHEcw3L5+k8POx6r74mxEYKG5kOb6Xpy2gCRW6zweT6TEhAf8vhxGgjhqrd/VO/Dirhsb+1hNpD1ue9hw==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.7.0.tgz",
+      "integrity": "sha512-ejvBr8MQCbVsWNZnCwDXjUKq40MDmHalq7cJ6e9s/qzTUFIIo/afzt1Vui9T97FM/V/pN4YsFVoed5NIa96RDg==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
-        "@eslint/core": "^0.15.1",
+        "@eslint/core": "^1.2.0",
         "levn": "^0.4.1"
       },
       "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+        "node": "^20.19.0 || ^22.13.0 || >=24"
       }
     },
     "node_modules/@humanfs/core": {
@@ -170,33 +149,19 @@
       }
     },
     "node_modules/@humanfs/node": {
-      "version": "0.16.6",
-      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.6.tgz",
-      "integrity": "sha512-YuI2ZHQL78Q5HbhDiBA1X4LmYdXCKCMQIfw0pw7piHJwyREFebJUvrQN4cMssyES6x+vfUbx1CIpaQUKYdQZOw==",
+      "version": "0.16.7",
+      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.7.tgz",
+      "integrity": "sha512-/zUx+yOsIrG4Y43Eh2peDeKCxlRt/gET6aHfaKpuq267qXdYDFViVHfMaLyygZOnl0kGWxFIgsBy8QFuTLUXEQ==",
       "dev": true,
       "license": "Apache-2.0",
       "dependencies": {
         "@humanfs/core": "^0.19.1",
-        "@humanwhocodes/retry": "^0.3.0"
+        "@humanwhocodes/retry": "^0.4.0"
       },
       "engines": {
         "node": ">=18.18.0"
       }
     },
-    "node_modules/@humanfs/node/node_modules/@humanwhocodes/retry": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/@humanwhocodes/retry/-/retry-0.3.1.tgz",
-      "integrity": "sha512-JBxkERygn7Bv/GbN5Rv8Ul6LVknS+5Bp6RgDC/O8gEBU/yeH5Ui5C/OlWrTb6qct7LjjfT6Re2NxB0ln0yYybA==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "engines": {
-        "node": ">=18.18"
-      },
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/nzakas"
-      }
-    },
     "node_modules/@humanwhocodes/module-importer": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz",
@@ -226,14 +191,14 @@
       }
     },
     "node_modules/@stylistic/eslint-plugin": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.2.2.tgz",
-      "integrity": "sha512-bE2DUjruqXlHYP3Q2Gpqiuj2bHq7/88FnuaS0FjeGGLCy+X6a07bGVuwtiOYnPSLHR6jmx5Bwdv+j7l8H+G97A==",
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/@stylistic/eslint-plugin/-/eslint-plugin-5.10.0.tgz",
+      "integrity": "sha512-nPK52ZHvot8Ju/0A4ucSX1dcPV2/1clx0kLcH5wDmrE4naKso7TUC/voUyU1O9OTKTrR6MYip6LP0ogEMQ9jPQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@eslint-community/eslint-utils": "^4.7.0",
-        "@typescript-eslint/types": "^8.37.0",
+        "@eslint-community/eslint-utils": "^4.9.1",
+        "@typescript-eslint/types": "^8.56.0",
         "eslint-visitor-keys": "^4.2.1",
         "espree": "^10.4.0",
         "estraverse": "^5.3.0",
@@ -243,9 +208,47 @@
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
       },
       "peerDependencies": {
-        "eslint": ">=9.0.0"
+        "eslint": "^9.0.0 || ^10.0.0"
       }
     },
+    "node_modules/@stylistic/eslint-plugin/node_modules/eslint-visitor-keys": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.1.tgz",
+      "integrity": "sha512-Uhdk5sfqcee/9H/rCOJikYz67o0a2Tw2hGRPOG2Y1R2dg7brRe1uG0yaNQDHu+TO/uQPF/5eCapvYSmHUjt7JQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@stylistic/eslint-plugin/node_modules/espree": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/espree/-/espree-10.4.0.tgz",
+      "integrity": "sha512-j6PAQ2uUr79PZhBjP5C5fhl8e39FmRnOjsD5lGnWrFU8i2G776tBK7+nP8KuQUTTyAZUwfQqXAgrVH5MbH9CYQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "acorn": "^8.15.0",
+        "acorn-jsx": "^5.3.2",
+        "eslint-visitor-keys": "^4.2.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@types/esrecurse": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/@types/esrecurse/-/esrecurse-4.3.1.tgz",
+      "integrity": "sha512-xJBAbDifo5hpffDBuHl0Y8ywswbiAp/Wi7Y/GtAgSlZyIABppyurxVueOPE8LUQOxdlgi6Zqce7uoEpqNTeiUw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -261,19 +264,19 @@
       "license": "MIT"
     },
     "node_modules/@types/node": {
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.2.0.tgz",
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     },
@@ -1981,13 +1785,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha512-ncTzHV7NvsQZkYe1DW7cbDLm0YpzHmZF5r/iyP3ZnQtMiJ+pjzisCiMNI+Sj+xQF5pXhSHxSB3uDbsBTzY/c2A==",
-      "dev": true,
-      "license": "ISC"
-    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index f538a1a..ba7d726 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mapbox/tiny-sdf",
-  "version": "2.0.7",
+  "version": "2.1.0",
   "description": "Browser-side SDF font generator",
   "type": "module",
   "main": "index.js",
@@ -34,12 +34,12 @@
     "index.d.ts"
   ],
   "devDependencies": {
-    "canvas": "^3.2.0",
-    "eslint": "^9.32.0",
+    "canvas": "^3.2.3",
+    "eslint": "^10.2.0",
     "eslint-config-mourner": "^4.1.0",
-    "eslint-plugin-html": "^8.1.3",
+    "eslint-plugin-html": "^8.1.4",
     "pixelmatch": "^7.1.0",
     "pngjs": "^7.0.0",
-    "st": "^3.0.2"
+    "st": "^3.0.3"
   }
 }
diff --git a/test/bench.js b/test/bench.js
deleted file mode 100644
index c953d49..0000000
--- a/test/bench.js
+++ /dev/null
@@ -1,31 +0,0 @@
-import TinySDF from '../index.js';
-import nodeCanvas from 'canvas';
-
-
-class MockTinySDF extends TinySDF {
-    _createCanvas(size) {
-        return nodeCanvas.createCanvas(size, size);
-    }
-}
-
-function bench(iterationsCount) {
-    const sdf = new MockTinySDF({
-        fontSize: 48,
-        buffer: 3
-    });
-    for (let i = 0; i < iterationsCount; ++i) {
-        sdf.draw('@');
-    }
-}
-
-function getCurrentTimestamp() {
-    return performance.now();
-}
-
-const ITERATIONS_COUNT = 1e5;
-const tStart = getCurrentTimestamp();
-bench(ITERATIONS_COUNT);
-const tEnd = getCurrentTimestamp();
-const dtSec = (tEnd - tStart) * 0.001;
-console.log(`Durations for ${ITERATIONS_COUNT} iterations: ${dtSec} seconds`);
-
diff --git a/test/fixtures/1-metrics.json b/test/fixtures/1-metrics.json
index 150a6cc..09dbeec 100644
--- a/test/fixtures/1-metrics.json
+++ b/test/fixtures/1-metrics.json
@@ -1,9 +1,9 @@
 {
-  "width": 48.2197265625,
-  "actualBoundingBoxLeft": 1.8720703125,
-  "actualBoundingBoxRight": 45.263671875,
-  "actualBoundingBoxAscent": 39.16796875,
-  "actualBoundingBoxDescent": 4.65625,
+  "width": 48,
+  "actualBoundingBoxLeft": 1.82421875,
+  "actualBoundingBoxRight": 45.2646484375,
+  "actualBoundingBoxAscent": 39.2158203125,
+  "actualBoundingBoxDescent": 4.6083984375,
   "emHeightAscent": 51,
   "emHeightDescent": 17,
   "alphabeticBaseline": 14.0390625
diff --git a/test/fixtures/1-out.json b/test/fixtures/1-out.json
index 19f4936..afd3b5e 100644
--- a/test/fixtures/1-out.json
+++ b/test/fixtures/1-out.json
@@ -1,9 +1,9 @@
 {
-  "width": 50,
+  "width": 51,
   "height": 51,
-  "glyphWidth": 44,
+  "glyphWidth": 45,
   "glyphHeight": 45,
   "glyphTop": 40,
-  "glyphLeft": 0,
-  "glyphAdvance": 48.2197265625
+  "glyphLeft": 1,
+  "glyphAdvance": 48
 }
\ No newline at end of file
diff --git a/test/fixtures/1-raw.png b/test/fixtures/1-raw.png
index 8a6f9c9..9b67378 100644
Binary files a/test/fixtures/1-raw.png and b/test/fixtures/1-raw.png differ
diff --git a/test/fixtures/1-sdf.png b/test/fixtures/1-sdf.png
index d3d958f..bbb6da2 100644
Binary files a/test/fixtures/1-sdf.png and b/test/fixtures/1-sdf.png differ
diff --git a/test/test.js b/test/test.js
index 71d99fd..490651c 100644
--- a/test/test.js
+++ b/test/test.js
@@ -88,7 +88,7 @@ test('does not crash on diacritic marks', () => {
     sdf.draw('G̱'[1]);
 });
 
-test('does not return negative-width glylphs', () => {
+test('does not return negative-width glyphs', () => {
     const sdf = new MockTinySDF();
     // stub these because they vary across environments
     sdf.ctx.measureText = () => ({