Add tests for font weight + fix Google Font loading

src/type/p5.Font.js

@@ -1,7 +1,7 @@
 /**
  * API:
  *    loadFont("https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,[email protected],200..800&display=swap")
- *    loadFont("{ font-family: "Bricolage Grotesque", serif; font-optical-sizing: auto; font-weight: <weight> font-style: normal; font-variation-settings: "wdth" 100; });
+ *    loadFont("@font-face { font-family: "Bricolage Grotesque", serif; font-optical-sizing: auto; font-weight: <weight> font-style: normal; font-variation-settings: "wdth" 100; });
  *    loadFont({
  *        fontFamily: '"Bricolage Grotesque", serif';
  *        fontOpticalSizing: 'auto';
@@ -31,6 +31,14 @@
  */
 import Typr from './lib/Typr.js';
 
+function unquote(name) {
+  // Unquote name from CSS
+  if ((name.startsWith('"') || name.startsWith("'")) && name.at(0) === name.at(-1)) {
+    return name.slice(1, -1).replace(/\/(['"])/g, '$1');
+  }
+  return name;
+}
+
 function font(p5, fn) {
 
   const pathArgCounts = { M: 2, L: 2, C: 6, Q: 4 };
@@ -455,6 +463,43 @@ function font(p5, fn) {
 
     let { path, name, success, error, descriptors } = parseCreateArgs(...args);
 
+    let isCSS = path.includes('@font-face');
+
+    if (!isCSS) {
+      const info = await fetch(path, { method: 'HEAD' });
+      const isCSSFile = info.headers.get('content-type')?.startsWith('text/css');
+      if (isCSSFile) {
+        isCSS = true;
+        path = await fetch(path).then((res) => res.text());
+      }
+    }
+
+    if (isCSS) {
+      const stylesheet = new CSSStyleSheet();
+      await stylesheet.replace(path);
+      const fontPromises = [];
+      for (const rule of stylesheet.cssRules) {
+        if (rule instanceof CSSFontFaceRule) {
+          const style = rule.style;
+          let name = unquote(style.getPropertyValue('font-family'));
+          const src = style.getPropertyValue('src');
+          const fontDescriptors = { ...(descriptors || {}) };
+          for (const key of style) {
+            if (key === 'font-family' || key === 'src') continue;
+            const camelCaseKey = key
+              .replace(/^font-/, '')
+              .split('-')
+              .map((v, i) => i === 0 ? v : `${v[0].toUpperCase()}${v.slice(1)}`)
+              .join('');
+            fontDescriptors[camelCaseKey] = style.getPropertyValue(key);
+          }
+          fontPromises.push(create(this, name, src, fontDescriptors));
+        }
+      }
+      const fonts = await Promise.all(fontPromises);
+      return fonts[0]; // TODO: handle multiple faces?
+    }
+
     let pfont;
     try {
       // load the raw font bytes
@@ -465,13 +510,20 @@ function font(p5, fn) {
 
       // parse the font data
       let fonts = Typr.parse(result);
+      console.log(fonts[0])
+      // TODO: generate descriptors from font in the future
 
       if (fonts.length !== 1 || fonts[0].cmap === undefined) {
         throw Error(23);
       }
 
       // make sure we have a valid name
-      name = name || extractFontName(fonts[0], path);
+      if (!name) {
+        name = extractFontName(fonts[0], path);
+        if (name.includes(' ')) {
+          name = name.replace(/ /g, '_');
+        }
+      }
 
       // create a FontFace object and pass it to the p5.Font constructor
       pfont = await create(this, name, path, descriptors, fonts[0]);

src/type/text2d.js

@@ -260,6 +260,10 @@ function text2d(p5, fn) {
     };
   };
 
+  Renderer.prototype._currentTextFont = function() {
+    return this.states.textFont.font || this.states.textFont.family;
+  }
+
   /**
    * Set the font and [size] and [options] for rendering text
    * @param {p5.Font | string} font - the font to use for rendering text
@@ -269,7 +273,7 @@ function text2d(p5, fn) {
   Renderer.prototype.textFont = function (font, size, options) {
 
     if (arguments.length === 0) {
-      return this.states.textFont;
+      return this._currentTextFont();
     }
 
     let family = font;
@@ -296,7 +300,7 @@ function text2d(p5, fn) {
     }
 
     // check for font-string with size in first arg
-    if (typeof size === 'undefined' && /[.0-9]+(%|em|p[xt])/.test(family)) {
+    if (typeof size === 'undefined' && /^[.0-9]+(%|em|p[xt])/.test(family)) {
       ({ family, size } = this._directSetFontString(family));
     }
 
@@ -351,7 +355,9 @@ function text2d(p5, fn) {
     // the setter
     if (typeof weight === 'number') {
       this.states.fontWeight = weight;
-      return this._applyTextProperties();
+      this._applyTextProperties();
+      this._setCanvasStyleProperty('font-variation-settings', `"wght" ${weight}`);
+      return;
     }
     // the getter
     return this.states.fontWeight;
@@ -410,6 +416,7 @@ function text2d(p5, fn) {
   Renderer.prototype.textProperty = function (prop, value, opts) {
 
     let modified = false, debug = opts?.debug || false;
+    console.log({ prop, value })
 
     // getter: return option from this.states or this.textDrawingContext()
     if (typeof value === 'undefined') {
@@ -605,7 +612,7 @@ function text2d(p5, fn) {
           case 'wght':
             if (debug) console.log('setting font-weight=' + val);
             // manually set the font-weight via the font string
-            this.textWeight(val);
+            if (this.states.fontWeight !== val) this.textWeight(val);
             return val;
           case 'wdth':
             if (0) { // attempt to map font-stretch to allowed keywords

test/unit/visual/cases/typography.js

@@ -18,6 +18,72 @@ visualSuite("Typography", function () {
       p5.text("test", 0, 0);
       screenshot();
     });
+
+    visualTest('with a Google Font URL', async function(p5, screenshot) {
+      p5.createCanvas(100, 100);
+      const font = await p5.loadFont(
+        'https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,[email protected],200..800&display=swap'
+      );
+      p5.textFont(font);
+      p5.textAlign(p5.LEFT, p5.TOP);
+      p5.textSize(35);
+      p5.text('p5*js', 0, 10, p5.width);
+      screenshot();
+    });
+  });
+
+  visualSuite('textWeight', function() {
+    visualTest('can control non-variable fonts', async function (p5, screenshot) {
+      p5.createCanvas(100, 100);
+      const font = await p5.loadFont(
+        'https://fonts.googleapis.com/css2?family=Sniglet:wght@400;800&display=swap'
+      );
+
+      for (const weight of [400, 800]) {
+        p5.background(255);
+        p5.textFont(font);
+        p5.textAlign(p5.LEFT, p5.TOP);
+        p5.textSize(35);
+        p5.textWeight(weight);
+        p5.text('p5*js', 0, 10, p5.width);
+        screenshot();
+      }
+    });
+
+    visualTest('can control variable fonts', async function (p5, screenshot) {
+      p5.createCanvas(100, 100);
+      const font = await p5.loadFont(
+        'https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap'
+      );
+
+      for (let weight = 400; weight <= 800; weight += 100) {
+        p5.background(255);
+        p5.textFont(font);
+        p5.textAlign(p5.LEFT, p5.TOP);
+        p5.textSize(35);
+        p5.textWeight(weight);
+        p5.text('p5*js', 0, 10, p5.width);
+        screenshot();
+      }
+    });
+
+    visualTest('can control variable fonts from files', async function (p5, screenshot) {
+      p5.createCanvas(100, 100);
+      const font = await p5.loadFont(
+        '/unit/assets/BricolageGrotesque-Variable.ttf',
+        { weight: '200 800' }
+      );
+
+      for (let weight = 400; weight <= 800; weight += 100) {
+        p5.background(255);
+        p5.textFont(font);
+        p5.textAlign(p5.LEFT, p5.TOP);
+        p5.textSize(35);
+        p5.textWeight(weight);
+        p5.text('p5*js', 0, 10, p5.width);
+        screenshot();
+      }
+    });
   });
 
   visualSuite("textAlign", function () { // TEMPORARY SKIP

test/unit/visual/screenshots/Typography/textFont/with a Google Font URL/metadata.json

@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 1
+}

test/unit/visual/screenshots/Typography/textWeight/can control non-variable fonts/metadata.json

@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 2
+}

test/unit/visual/screenshots/Typography/textWeight/can control variable fonts from files/metadata.json

@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 5
+}

test/unit/visual/screenshots/Typography/textWeight/can control variable fonts/metadata.json

@@ -0,0 +1,3 @@
+{
+  "numScreenshots": 5
+}