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Split of "Tentative Canvas “Text Rendering” test"
Tentative Canvas “Text Rendering” test
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‎MotionMark/resources/debug-runner/tests.js‎

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@@ -475,6 +475,10 @@ Suites.push(new Suite("Tentative 1.4 suite",
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{
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url: "dev/dashboard/dashboard.html",
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name: "Dashboard"
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},
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{
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url: "dev/text-rendering.html",
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name: "Text Rendering"
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}
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]
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));

‎MotionMark/tests/dev/resources/text-rendering.js‎

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/*
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* Copyright (C) 2025 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT of THE USE of THIS SOFTWARE, EVEN IF ADVISED of
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* THE POSSIBILITY of SUCH DAMAGE.
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*/
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// === LOREM IPSUM GENERATOR ===
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const LoremIpsum = {
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_words: [
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'lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur', 'adipiscing', 'elit', 'curabitur', 'vel', 'hendrerit', 'libero',
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'eleifend', 'blandit', 'nunc', 'ornare', 'odio', 'ut', 'orci', 'gravida', 'imperdiet', 'nullam', 'purus', 'lacinia', 'a',
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'pretium', 'quis', 'congue', 'praesent', 'sagittis', 'laoreet', 'auctor', 'mauris', 'non', 'velit', 'eros', 'dictum',
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'proin', 'accumsan', 'sapien', 'nec', 'massa', 'volutpat', 'venenatis', 'sed', 'eu', 'molestie', 'lacus', 'quisque',
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'porttitor', 'ligula', 'dui', 'mollis', 'tempus', 'at', 'magna', 'vestibulum', 'turpis', 'ac', 'diam', 'tincidunt',
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'id', 'condimentum', 'enim', 'sodales', 'in', 'hac', 'habitasse', 'platea', 'dictumst', 'aenean', 'neque', 'fusce',
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'augue', 'leo', 'eget', 'semper', 'mattis', 'tortor', 'scelerisque', 'nulla', 'interdum', 'tellus', 'malesuada',
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'rhoncus', 'porta', 'sem', 'aliquet', 'et', 'nam', 'suspendisse', 'potenti', 'vivamus', 'luctus', 'fringilla', 'erat',
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],
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generate(wordCount) {
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let words = [];
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let sentenceIndex = 0;
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while (words.length < wordCount) {
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const sentenceLength = Math.floor(Pseudo.random() * 12) + 8; // 8 to 20 words
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const paragraphLength = Math.floor(Pseudo.random() * 5) + 5; // 5 to 10 sentences │
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for (let p = 0; p < paragraphLength && words.length < wordCount; p++) {
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for (let i = 0; i < sentenceLength && words.length < wordCount; i++) {
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let word = this._words[Math.floor(Pseudo.random() * this._words.length)];
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if (i === 0) {
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word = word.charAt(0).toUpperCase() + word.slice(1);
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}
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if (i === sentenceLength - 1) {
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word += '.';
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}
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const endOfParagraph = (i === sentenceLength - 1) && (p === paragraphLength - 1);
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words.push({ word, endOfParagraph, sentenceIndex });
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}
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sentenceIndex++;
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}
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}
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return words;
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}
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};
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// === TEXT LAYOUT ===
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class TextLayout {
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constructor(words, context, pageWidth, pageHeight, fontSize) {
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this.words = words;
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this.context = context;
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this.pageWidth = pageWidth;
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this.pageHeight = pageHeight;
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this.pageMargin = 20;
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this.lineHeight = 1.2;
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this.fontSize = fontSize;
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this.pages = this._layoutPages();
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}
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_layoutPages() {
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const pages = [];
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const drawableWidth = this.pageWidth - this.pageMargin * 2;
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const drawableHeight = this.pageHeight - this.pageMargin * 2;
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if (this.words.length === 0)
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return pages;
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let currentPageWords = [];
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let x = this.pageMargin;
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let y = this.pageMargin + this.fontSize;
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for (const wordData of this.words) {
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let fontStyle = '';
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if (wordData.style === 'bold') fontStyle = 'bold ';
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if (wordData.style === 'italic') fontStyle = 'italic ';
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this.context.font = `${fontStyle}${this.fontSize}px sans-serif`;
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const word = wordData.word;
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const wordWidth = this.context.measureText(word + ' ').width;
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if (x + wordWidth > drawableWidth + this.pageMargin) {
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x = this.pageMargin;
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y += this.fontSize * this.lineHeight;
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}
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if (y > drawableHeight) {
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pages.push(currentPageWords);
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currentPageWords = [];
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x = this.pageMargin;
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y = this.pageMargin + this.fontSize;
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}
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currentPageWords.push({ text: word, x, y, width: wordWidth, sentenceIndex: wordData.sentenceIndex, style: wordData.style });
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x += wordWidth;
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if (wordData.endOfParagraph) {
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x = this.pageMargin;
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y += this.fontSize * this.lineHeight * 2;
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}
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}
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if (currentPageWords.length > 0) {
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pages.push(currentPageWords);
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}
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return pages;
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}
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}
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// === STAGE ===
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class TextRenderingStage extends Stage {
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async initialize(benchmark, options) {
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await super.initialize(benchmark, options);
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this.context = this.element.getContext('2d');
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this.context.scale(this.devicePixelRatio, this.devicePixelRatio);
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Pseudo.resetRandomSeed();
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this.words = LoremIpsum.generate(100000);
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this._complexity = 0;
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this.numPagesToRender = 0;
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// Assign highlight colors and styles to each word
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const highlightColors = ['#FFFFFF', '#FFFFFF', '#FFFFFF', '#FFFF99', '#99FF99', '#99FFFF', '#FF99FF'];
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const styles = ['bold', 'italic', 'underline'];
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this.sentenceColors = [];
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this.words.forEach(word => {
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// Assign sentence color
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if (!this.sentenceColors[word.sentenceIndex]) {
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this.sentenceColors[word.sentenceIndex] = highlightColors[Math.floor(Pseudo.random() * highlightColors.length)];
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}
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// Assign word style
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if (Pseudo.random() < 0.75) {
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word.style = 'normal';
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} else {
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word.style = styles[Math.floor(Pseudo.random() * styles.length)];
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}
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});
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// Virtual dimensions
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this.virtualDPI = 96;
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this.virtualPageWidth = 8.5 * this.virtualDPI;
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this.virtualPageHeight = 11 * this.virtualDPI;
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this.virtualFontSize = (8 / 72) * this.virtualDPI; // 8pt font
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// Perform a single, full layout on the virtual pages.
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this.virtualLayout = new TextLayout(this.words, this.context, this.virtualPageWidth, this.virtualPageHeight, this.virtualFontSize);
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}
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tune(count) {
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this._complexity = Math.max(0, this._complexity + count);
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let wordsCounted = 0;
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let pages = 0;
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for (const page of this.virtualLayout.pages) {
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wordsCounted += page.length;
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pages++;
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if (wordsCounted >= this._complexity)
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break;
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}
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this.numPagesToRender = pages;
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}
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animate() {
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const context = this.context;
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const stageSize = this.size;
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// Determine grid and page dimensions
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let bestGrid = { cols: 0, rows: 0, aspectRatioDiff: Infinity };
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const stageAspectRatio = stageSize.x / stageSize.y;
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const pageAspectRatio = this.virtualPageWidth / this.virtualPageHeight;
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const gapToPageHeightRatio = 0.05;
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const numPages = this.numPagesToRender;
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if (numPages === 0) {
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context.clearRect(0, 0, stageSize.x, stageSize.y);
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return;
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}
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for (let cols = 1; cols <= numPages; cols++) {
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const rows = Math.ceil(numPages / cols);
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const gridAspectRatio = (cols * pageAspectRatio + (cols + 1) * gapToPageHeightRatio * pageAspectRatio) / (rows + (rows + 1) * gapToPageHeightRatio);
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const aspectRatioDiff = Math.abs(gridAspectRatio - stageAspectRatio);
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if (aspectRatioDiff < bestGrid.aspectRatioDiff) {
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bestGrid = { cols, rows, aspectRatioDiff };
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}
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}
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const { cols, rows } = bestGrid;
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let actualPageHeight, actualPageWidth, gap;
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const gridAspectRatio = (cols * pageAspectRatio + (cols + 1) * gapToPageHeightRatio * pageAspectRatio) / (rows + (rows + 1) * gapToPageHeightRatio);
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if (stageAspectRatio > gridAspectRatio) { // Height is constrained
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actualPageHeight = stageSize.y / (rows + (rows + 1) * gapToPageHeightRatio);
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} else { // Width is constrained
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actualPageHeight = stageSize.x / (cols * pageAspectRatio + (cols + 1) * gapToPageHeightRatio * pageAspectRatio);
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}
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actualPageWidth = actualPageHeight * pageAspectRatio;
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gap = actualPageHeight * gapToPageHeightRatio;
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const scale = actualPageHeight / this.virtualPageHeight;
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const scaledFontSize = this.virtualFontSize * scale;
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const scaledLineHeight = this.virtualLayout.lineHeight * scaledFontSize;
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// Draw background
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context.fillStyle = 'lightgray';
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context.fillRect(0, 0, stageSize.x, stageSize.y);
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const totalGridWidth = cols * actualPageWidth + (cols - 1) * gap;
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const totalGridHeight = rows * actualPageHeight + (rows - 1) * gap;
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const startX = (stageSize.x - totalGridWidth) / 2;
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const startY = (stageSize.y - totalGridHeight) / 2;
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let wordsDrawn = 0;
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for (let i = 0; i < numPages; i++) {
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const pageData = this.virtualLayout.pages[i];
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const pageColumn = i % cols;
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const pageRow = Math.floor(i / cols);
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const pageX = startX + pageColumn * (actualPageWidth + gap);
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const pageY = startY + pageRow * (actualPageHeight + gap);
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// Draw page
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context.fillStyle = 'white';
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context.fillRect(pageX, pageY, actualPageWidth, actualPageHeight);
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context.strokeStyle = 'black';
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context.lineWidth = 1;
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context.strokeRect(pageX, pageY, actualPageWidth, actualPageHeight);
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// Draw text and highlights
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for (const word of pageData) {
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if (wordsDrawn >= this._complexity) break;
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const scaledX = pageX + word.x * scale;
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const scaledY = pageY + word.y * scale;
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const scaledWidth = word.width * scale;
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// Highlight
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context.fillStyle = this.sentenceColors[word.sentenceIndex];
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context.fillRect(scaledX, scaledY - scaledFontSize, scaledWidth, scaledLineHeight);
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// Text
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let fontStyle = '';
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if (word.style === 'bold') fontStyle = 'bold ';
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if (word.style === 'italic') fontStyle = 'italic ';
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context.font = `${fontStyle}${scaledFontSize}px sans-serif`;
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context.fillStyle = 'black';
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context.fillText(word.text, scaledX, scaledY);
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// Underline
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if (word.style === 'underline') {
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const underlineHeight = 1 * scale;
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context.fillRect(scaledX, scaledY + 2 * scale, scaledWidth, underlineHeight);
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}
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wordsDrawn++;
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}
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if (wordsDrawn >= this._complexity) break;
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}
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}
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complexity() {
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return this._complexity;
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}
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}
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// === BENCHMARK ===
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class TextRenderingBenchmark extends Benchmark {
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constructor(options) {
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super(new TextRenderingStage(), options);
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}
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}
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window.benchmarkClass = TextRenderingBenchmark;

‎MotionMark/tests/dev/text-rendering.html‎

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<!--
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Copyright (C) 2025 Apple Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18+
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19+
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20+
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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THE POSSIBILITY OF SUCH DAMAGE.
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-->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<link rel="stylesheet" type="text/css" href="../resources/stage.css">
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</head>
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<body>
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<canvas id="stage"></canvas>
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<script src="../../resources/strings.js"></script>
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<script src="../../resources/extensions.js"></script>
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<script src="../../resources/statistics.js"></script>
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<script src="../resources/math.js"></script>
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<script src="../resources/benchmark.js"></script>
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<script src="../resources/controllers.js"></script>
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<script src="../resources/stage.js"></script>
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<script src="../core/resources/canvas-stage.js"></script>
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<script src="resources/text-rendering.js"></script>
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</body>
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</html>

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