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glyph-inspector.html
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<!DOCTYPE html>
<html>
<head>
<title>opentype.js glyph inspector</title>
<meta name="description" content="A JavaScript library to manipulate the letterforms of text from the browser or node.js.">
<meta charset="utf-8">
<link rel="stylesheet" href="site.css">
<script src="dist/opentype.js"></script>
</head>
<body>
<div class="header">
<div class="container">
<h1>opentype.js</h1>
<nav>
<a href="index.html">Home</a>
<a href="font-inspector.html">Font Inspector</a>
<a href="glyph-inspector.html">Glyph Inspector</a>
</nav>
<nav class="right">
<a class="github" href="https://github.com/opentypejs/opentype.js">Fork me on GitHub</a>
</nav>
</div>
</div>
<div class="container">
<div class="explain">
<h1>Glyph Inspector</h1>
<small>opentype.js is an OpenType and TrueType font parser. Here you can inspect the raw glyph data.</small>
</div>
<input id="file" type="file">
<span class="info" id="font-name">Roboto-Black</span>
<div id="message"></div>
<hr>
<div>
Glyphs <span id="pagination"></span>
<br>
<div id="glyph-list-end"></div>
</div>
<div style="position: relative">
<div id="glyph-display">
<canvas id="glyph-bg" width="500" height="500"></canvas>
<canvas id="glyph" width="500" height="500"></canvas>
</div>
<div id="glyph-data"></div>
<div style="clear: both"></div>
</div>
<hr>
<div class="explain">
<h1>Free Software</h1>
<p>opentype.js is available on <a href="https://github.com/opentypejs/opentype.js">GitHub</a> under the <a href="https://raw.github.com/opentypejs/opentype.js/master/LICENSE">MIT License</a>.</p>
<p>Copyright © 2020 Frederik De Bleser.</p>
</div>
<hr>
</div>
<script>
var cellCount = 100,
cellWidth = 44,
cellHeight = 40,
cellMarginTop = 1,
cellMarginBottom = 8,
cellMarginLeftRight = 1,
glyphMargin = 5,
pixelRatio = window.devicePixelRatio || 1;
var pageSelected, font, fontScale, fontSize, fontBaseline, glyphScale, glyphSize, glyphBaseline;
function enableHighDPICanvas(canvas) {
if (typeof canvas === 'string') {
canvas = document.getElementById(canvas);
}
var pixelRatio = window.devicePixelRatio || 1;
if (pixelRatio === 1) return;
var oldWidth = canvas.width;
var oldHeight = canvas.height;
canvas.width = oldWidth * pixelRatio;
canvas.height = oldHeight * pixelRatio;
canvas.style.width = oldWidth + 'px';
canvas.style.height = oldHeight + 'px';
canvas.getContext('2d').scale(pixelRatio, pixelRatio);
}
function showErrorMessage(message) {
var el = document.getElementById('message');
if (!message || message.trim().length === 0) {
el.style.display = 'none';
} else {
el.style.display = 'block';
}
el.innerHTML = message;
}
function pathCommandToString(cmd) {
var str = '<strong>' + cmd.type + '</strong> ' +
((cmd.x !== undefined) ? 'x='+cmd.x+' y='+cmd.y+' ' : '') +
((cmd.x1 !== undefined) ? 'x1='+cmd.x1+' y1='+cmd.y1+' ' : '') +
((cmd.x2 !== undefined) ? 'x2='+cmd.x2+' y2='+cmd.y2 : '');
return str;
}
function contourToString(contour) {
return '<pre class="contour">' + contour.map(function(point) {
return '<span class="' + (point.onCurve ? 'on' : 'off') + 'curve">x=' + point.x + ' y=' + point.y + '</span>';
}).join('\n') + '</pre>';
}
function formatUnicode(unicode) {
unicode = unicode.toString(16);
if (unicode.length > 4) {
return ("000000" + unicode.toUpperCase()).substr(-6)
} else {
return ("0000" + unicode.toUpperCase()).substr(-4)
}
}
function displayGlyphData(glyphIndex) {
var container = document.getElementById('glyph-data');
if (glyphIndex < 0) {
container.innerHTML = '';
return;
}
var glyph = font.glyphs.get(glyphIndex),
html = '<dl>';
html += '<dt>name</dt><dd>'+glyph.name+'</dd>';
if (glyph.unicodes.length > 0) {
html += '<dt>unicode</dt><dd>'+ glyph.unicodes.map(formatUnicode).join(', ') +'</dd>';
}
html += '<dt>index</dt><dd>'+glyph.index+'</dd>';
if (glyph.xMin !== 0 || glyph.xMax !== 0 || glyph.yMin !== 0 || glyph.yMax !== 0) {
html += '<dt>xMin</dt><dd>'+glyph.xMin+'</dd>' +
'<dt>xMax</dt><dd>'+glyph.xMax+'</dd>' +
'<dt>yMin</dt><dd>'+glyph.yMin+'</dd>' +
'<dt>yMax</dt><dd>'+glyph.yMax+'</dd>';
}
html += '<dt>advanceWidth</dt><dd>'+glyph.advanceWidth+'</dd>';
if(glyph.leftSideBearing !== undefined) {
html += '<dt>leftSideBearing</dt><dd>'+glyph.leftSideBearing+'</dd>';
}
html += '</dl>';
if (glyph.numberOfContours > 0) {
var contours = glyph.getContours();
html += 'contours:<div id="glyph-contours">' + contours.map(contourToString).join('\n') + '</div>';
} else if (glyph.isComposite) {
html += '<br>This composite glyph is a combination of :<ul><li>' +
glyph.components.map(function(component) {
if (component.matchedPoints === undefined) {
return 'glyph '+component.glyphIndex+' at dx='+component.dx+', dy='+component.dy;
} else {
return 'glyph '+component.glyphIndex+' at matchedPoints=['+component.matchedPoints+']';
}
}).join('</li><li>') + '</li></ul>';
} else if (glyph.path) {
html += 'path:<br><pre> ' + glyph.path.commands.map(pathCommandToString).join('\n ') + '\n</pre>';
}
container.innerHTML = html;
}
var arrowLength = 10,
arrowAperture = 4;
function drawArrow(ctx, x1, y1, x2, y2) {
var dx = x2 - x1,
dy = y2 - y1,
segmentLength = Math.sqrt(dx*dx + dy*dy),
unitx = dx / segmentLength,
unity = dy / segmentLength,
basex = x2 - arrowLength * unitx,
basey = y2 - arrowLength * unity,
normalx = arrowAperture * unity,
normaly = -arrowAperture * unitx;
ctx.beginPath();
ctx.moveTo(x2, y2);
ctx.lineTo(basex + normalx, basey + normaly);
ctx.lineTo(basex - normalx, basey - normaly);
ctx.lineTo(x2, y2);
ctx.closePath();
ctx.fill();
}
/**
* This function is Path.prototype.draw with an arrow
* at the end of each contour.
*/
function drawPathWithArrows(ctx, path) {
var i, cmd, x1, y1, x2, y2;
var arrows = [];
ctx.beginPath();
for (i = 0; i < path.commands.length; i += 1) {
cmd = path.commands[i];
if (cmd.type === 'M') {
if(x1 !== undefined) {
arrows.push([ctx, x1, y1, x2, y2]);
}
ctx.moveTo(cmd.x, cmd.y);
} else if (cmd.type === 'L') {
ctx.lineTo(cmd.x, cmd.y);
x1 = x2;
y1 = y2;
} else if (cmd.type === 'C') {
ctx.bezierCurveTo(cmd.x1, cmd.y1, cmd.x2, cmd.y2, cmd.x, cmd.y);
x1 = cmd.x2;
y1 = cmd.y2;
} else if (cmd.type === 'Q') {
ctx.quadraticCurveTo(cmd.x1, cmd.y1, cmd.x, cmd.y);
x1 = cmd.x1;
y1 = cmd.y1;
} else if (cmd.type === 'Z') {
arrows.push([ctx, x1, y1, x2, y2]);
ctx.closePath();
}
x2 = cmd.x;
y2 = cmd.y;
}
if (path.fill) {
ctx.fillStyle = path.fill;
ctx.fill();
}
if (path.stroke) {
ctx.strokeStyle = path.stroke;
ctx.lineWidth = path.strokeWidth;
ctx.stroke();
}
ctx.fillStyle = '#000000';
arrows.forEach(function(arrow) {
drawArrow.apply(null, arrow);
});
}
function displayGlyph(glyphIndex) {
var canvas = document.getElementById('glyph'),
ctx = canvas.getContext('2d'),
width = canvas.width / pixelRatio,
height = canvas.height / pixelRatio;
ctx.clearRect(0, 0, width, height);
if(glyphIndex < 0) return;
var glyph = font.glyphs.get(glyphIndex),
glyphWidth = glyph.advanceWidth * glyphScale,
xmin = (width - glyphWidth)/2,
xmax = (width + glyphWidth)/2,
x0 = xmin,
markSize = 10;
ctx.fillStyle = '#606060';
ctx.fillRect(xmin-markSize+1, glyphBaseline, markSize, 1);
ctx.fillRect(xmin, glyphBaseline, 1, markSize);
ctx.fillRect(xmax, glyphBaseline, markSize, 1);
ctx.fillRect(xmax, glyphBaseline, 1, markSize);
ctx.textAlign = 'center';
ctx.fillText('0', xmin, glyphBaseline+markSize+10);
ctx.fillText(glyph.advanceWidth, xmax, glyphBaseline+markSize+10);
ctx.fillStyle = '#000000';
var path = glyph.getPath(x0, glyphBaseline, glyphSize);
path.fill = '#808080';
path.stroke = '#000000';
path.strokeWidth = 1.5;
drawPathWithArrows(ctx, path);
glyph.drawPoints(ctx, x0, glyphBaseline, glyphSize);
}
function renderGlyphItem(canvas, glyphIndex) {
var cellMarkSize = 4;
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, cellWidth, cellHeight);
if (glyphIndex >= font.numGlyphs) return;
ctx.fillStyle = '#606060';
ctx.font = '9px sans-serif';
ctx.fillText(glyphIndex, 1, cellHeight-1);
var glyph = font.glyphs.get(glyphIndex),
glyphWidth = glyph.advanceWidth * fontScale,
xmin = (cellWidth - glyphWidth)/2,
xmax = (cellWidth + glyphWidth)/2,
x0 = xmin;
ctx.fillStyle = '#a0a0a0';
ctx.fillRect(xmin-cellMarkSize+1, fontBaseline, cellMarkSize, 1);
ctx.fillRect(xmin, fontBaseline, 1, cellMarkSize);
ctx.fillRect(xmax, fontBaseline, cellMarkSize, 1);
ctx.fillRect(xmax, fontBaseline, 1, cellMarkSize);
ctx.fillStyle = '#000000';
glyph.draw(ctx, x0, fontBaseline, fontSize);
}
function displayGlyphPage(pageNum) {
pageSelected = pageNum;
document.getElementById('p'+pageNum).className = 'page-selected';
var firstGlyph = pageNum * cellCount;
for(var i = 0; i < cellCount; i++) {
renderGlyphItem(document.getElementById('g'+i), firstGlyph+i);
}
}
function pageSelect(event) {
document.getElementsByClassName('page-selected')[0].className = '';
displayGlyphPage(+event.target.id.substr(1));
}
function initGlyphDisplay() {
var glyphBgCanvas = document.getElementById('glyph-bg'),
w = glyphBgCanvas.width / pixelRatio,
h = glyphBgCanvas.height / pixelRatio,
glyphW = w - glyphMargin*2,
glyphH = h - glyphMargin*2,
head = font.tables.head,
maxHeight = head.yMax - head.yMin,
ctx = glyphBgCanvas.getContext('2d');
glyphScale = Math.min(glyphW/(head.xMax - head.xMin), glyphH/maxHeight);
glyphSize = glyphScale * font.unitsPerEm;
glyphBaseline = glyphMargin + glyphH * head.yMax / maxHeight;
function hline(text, yunits) {
ypx = glyphBaseline - yunits * glyphScale;
ctx.fillText(text, 2, ypx+3);
ctx.fillRect(80, ypx, w, 1);
}
ctx.clearRect(0, 0, w, h);
ctx.fillStyle = '#a0a0a0';
hline('Baseline', 0);
hline('yMax', font.tables.head.yMax);
hline('yMin', font.tables.head.yMin);
hline('Ascender', font.tables.hhea.ascender);
hline('Descender', font.tables.hhea.descender);
hline('Typo Ascender', font.tables.os2.sTypoAscender);
hline('Typo Descender', font.tables.os2.sTypoDescender);
}
function onFontLoaded(font) {
window.font = font;
var w = cellWidth - cellMarginLeftRight * 2,
h = cellHeight - cellMarginTop - cellMarginBottom,
head = font.tables.head,
maxHeight = head.yMax - head.yMin;
fontScale = Math.min(w/(head.xMax - head.xMin), h/maxHeight);
fontSize = fontScale * font.unitsPerEm;
fontBaseline = cellMarginTop + h * head.yMax / maxHeight;
var pagination = document.getElementById("pagination");
pagination.innerHTML = '';
var fragment = document.createDocumentFragment();
var numPages = Math.ceil(font.numGlyphs / cellCount);
for(var i = 0; i < numPages; i++) {
var link = document.createElement('span');
var lastIndex = Math.min(font.numGlyphs-1, (i+1)*cellCount-1);
link.textContent = i*cellCount + '-' + lastIndex;
link.id = 'p' + i;
link.addEventListener('click', pageSelect, false);
fragment.appendChild(link);
// A white space allows to break very long lines into multiple lines.
// This is needed for fonts with thousands of glyphs.
fragment.appendChild(document.createTextNode(' '));
}
pagination.appendChild(fragment);
initGlyphDisplay();
displayGlyphPage(0);
displayGlyph(-1);
displayGlyphData(-1);
}
function onReadFile(e) {
document.getElementById('font-name').innerHTML = '';
var file = e.target.files[0];
var reader = new FileReader();
reader.onload = function(e) {
try {
font = opentype.parse(e.target.result, {lowMemory:true});
showErrorMessage('');
onFontLoaded(font);
} catch (err) {
showErrorMessage(err.toString());
if (err.stack) console.log(err.stack);
throw(err);
}
};
reader.onerror = function(err) {
showErrorMessage(err.toString());
};
reader.readAsArrayBuffer(file);
}
function cellSelect(event) {
if (!font) return;
var firstGlyphIndex = pageSelected*cellCount,
cellIndex = +event.target.id.substr(1),
glyphIndex = firstGlyphIndex + cellIndex;
if (glyphIndex < font.numGlyphs) {
displayGlyph(glyphIndex);
displayGlyphData(glyphIndex);
}
}
function prepareGlyphList() {
var marker = document.getElementById('glyph-list-end'),
parent = marker.parentElement;
for(var i = 0; i < cellCount; i++) {
var canvas = document.createElement('canvas');
canvas.width = cellWidth;
canvas.height = cellHeight;
canvas.className = 'item';
canvas.id = 'g'+i;
canvas.addEventListener('click', cellSelect, false);
enableHighDPICanvas(canvas);
parent.insertBefore(canvas, marker);
}
}
var fontFileName = 'fonts/Roboto-Black.ttf';
document.getElementById('font-name').innerHTML = fontFileName.split('/')[1];
var fileButton = document.getElementById('file');
fileButton.addEventListener('change', onReadFile, false);
enableHighDPICanvas('glyph-bg');
enableHighDPICanvas('glyph');
prepareGlyphList();
opentype.load(fontFileName, function(err, font) {
var amount, glyph, ctx, x, y, fontSize;
if (err) {
showErrorMessage(err.toString());
return;
}
onFontLoaded(font);
}, {lowMemory:true});
</script>
</body>
</html>