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337 lines
13 KiB
337 lines
13 KiB
describe('Font Behavior', () => {
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let container;
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let notoSerifFontBuffer = null;
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// This font is known to support kerning
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const notoSerifFontLoaded = fetch('/assets/NotoSerif-Regular.ttf').then(
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(response) => response.arrayBuffer()).then(
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(buffer) => {
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notoSerifFontBuffer = buffer;
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});
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let bungeeFontBuffer = null;
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// This font has tofu for incorrect null terminators
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// see https://bugs.chromium.org/p/skia/issues/detail?id=9314
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const bungeeFontLoaded = fetch('/assets/Bungee-Regular.ttf').then(
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(response) => response.arrayBuffer()).then(
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(buffer) => {
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bungeeFontBuffer = buffer;
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});
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beforeEach(async () => {
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await LoadCanvasKit;
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await notoSerifFontLoaded;
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await bungeeFontLoaded;
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container = document.createElement('div');
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container.innerHTML = `
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<canvas width=600 height=600 id=test></canvas>
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<canvas width=600 height=600 id=report></canvas>`;
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document.body.appendChild(container);
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});
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afterEach(() => {
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document.body.removeChild(container);
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});
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gm('monospace_text_on_path', (canvas) => {
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const paint = new CanvasKit.Paint();
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paint.setAntiAlias(true);
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paint.setStyle(CanvasKit.PaintStyle.Stroke);
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const font = new CanvasKit.Font(null, 24);
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const fontPaint = new CanvasKit.Paint();
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fontPaint.setAntiAlias(true);
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fontPaint.setStyle(CanvasKit.PaintStyle.Fill);
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const arc = new CanvasKit.Path();
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arc.arcToOval(CanvasKit.LTRBRect(20, 40, 280, 300), -160, 140, true);
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arc.lineTo(210, 140);
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arc.arcToOval(CanvasKit.LTRBRect(20, 0, 280, 260), 160, -140, true);
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// Only 1 dot should show up in the image, because we run out of path.
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const str = 'This téxt should follow the curve across contours...';
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const textBlob = CanvasKit.TextBlob.MakeOnPath(str, arc, font);
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canvas.drawPath(arc, paint);
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canvas.drawTextBlob(textBlob, 0, 0, fontPaint);
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textBlob.delete();
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arc.delete();
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paint.delete();
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font.delete();
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fontPaint.delete();
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});
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gm('serif_text_on_path', (canvas) => {
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer);
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const paint = new CanvasKit.Paint();
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paint.setAntiAlias(true);
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paint.setStyle(CanvasKit.PaintStyle.Stroke);
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const font = new CanvasKit.Font(notoSerif, 24);
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const fontPaint = new CanvasKit.Paint();
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fontPaint.setAntiAlias(true);
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fontPaint.setStyle(CanvasKit.PaintStyle.Fill);
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const arc = new CanvasKit.Path();
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arc.arcToOval(CanvasKit.LTRBRect(20, 40, 280, 300), -160, 140, true);
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arc.lineTo(210, 140);
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arc.arcToOval(CanvasKit.LTRBRect(20, 0, 280, 260), 160, -140, true);
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const str = 'This téxt should follow the curve across contours...';
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const textBlob = CanvasKit.TextBlob.MakeOnPath(str, arc, font, 60.5);
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canvas.drawPath(arc, paint);
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canvas.drawTextBlob(textBlob, 0, 0, fontPaint);
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textBlob.delete();
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arc.delete();
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paint.delete();
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notoSerif.delete();
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font.delete();
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fontPaint.delete();
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fontMgr.delete();
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});
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// https://bugs.chromium.org/p/skia/issues/detail?id=9314
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gm('nullterminators_skbug_9314', (canvas) => {
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const bungee = fontMgr.MakeTypefaceFromData(bungeeFontBuffer);
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// yellow, to make sure tofu is plainly visible
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canvas.clear(CanvasKit.Color(255, 255, 0, 1));
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const font = new CanvasKit.Font(bungee, 24);
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const fontPaint = new CanvasKit.Paint();
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fontPaint.setAntiAlias(true);
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fontPaint.setStyle(CanvasKit.PaintStyle.Fill);
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const str = 'This is téxt';
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const textBlob = CanvasKit.TextBlob.MakeFromText(str + ' text blob', font);
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canvas.drawTextBlob(textBlob, 10, 50, fontPaint);
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canvas.drawText(str + ' normal', 10, 100, fontPaint, font);
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canvas.drawText('null terminator ->\u0000<- on purpose', 10, 150, fontPaint, font);
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textBlob.delete();
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bungee.delete();
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font.delete();
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fontPaint.delete();
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fontMgr.delete();
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});
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gm('textblobs_with_glyphs', (canvas) => {
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canvas.clear(CanvasKit.WHITE);
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer);
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const font = new CanvasKit.Font(notoSerif, 24);
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const bluePaint = new CanvasKit.Paint();
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bluePaint.setColor(CanvasKit.parseColorString('#04083f')); // arbitrary deep blue
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bluePaint.setAntiAlias(true);
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bluePaint.setStyle(CanvasKit.PaintStyle.Fill);
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const redPaint = new CanvasKit.Paint();
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redPaint.setColor(CanvasKit.parseColorString('#770b1e')); // arbitrary deep red
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const ids = font.getGlyphIDs('AEGIS ægis');
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expect(ids.length).toEqual(10); // one glyph id per glyph
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expect(ids[0]).toEqual(36); // spot check this, should be consistent as long as the font is.
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const bounds = font.getGlyphBounds(ids, bluePaint);
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expect(bounds.length).toEqual(40); // 4 measurements per glyph
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expect(bounds[0]).toEqual(0); // again, spot check the measurements for the first glyph.
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expect(bounds[1]).toEqual(-17);
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expect(bounds[2]).toEqual(17);
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expect(bounds[3]).toEqual(0);
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const widths = font.getGlyphWidths(ids, bluePaint);
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expect(widths.length).toEqual(10); // 1 width per glyph
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expect(widths[0]).toEqual(17);
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const topBlob = CanvasKit.TextBlob.MakeFromGlyphs(ids, font);
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canvas.drawTextBlob(topBlob, 5, 30, bluePaint);
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canvas.drawTextBlob(topBlob, 5, 60, redPaint);
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topBlob.delete();
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const mIDs = CanvasKit.MallocGlyphIDs(ids.length);
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const mArr = mIDs.toTypedArray();
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mArr.set(ids);
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const mXforms = CanvasKit.Malloc(Float32Array, ids.length * 4);
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const mXformsArr = mXforms.toTypedArray();
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// Draw each glyph rotated slightly and slightly lower than the glyph before it.
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let currX = 0;
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for (let i = 0; i < ids.length; i++) {
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mXformsArr[i * 4] = Math.cos(-Math.PI / 16); // scos
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mXformsArr[i * 4 + 1] = Math.sin(-Math.PI / 16); // ssin
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mXformsArr[i * 4 + 2] = currX; // tx
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mXformsArr[i * 4 + 3] = i*2; // ty
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currX += widths[i];
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}
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const bottomBlob = CanvasKit.TextBlob.MakeFromRSXformGlyphs(mIDs, mXforms, font);
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canvas.drawTextBlob(bottomBlob, 5, 110, bluePaint);
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canvas.drawTextBlob(bottomBlob, 5, 140, redPaint);
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bottomBlob.delete();
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CanvasKit.Free(mIDs);
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CanvasKit.Free(mXforms);
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bluePaint.delete();
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redPaint.delete();
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notoSerif.delete();
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font.delete();
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fontMgr.delete();
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});
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it('can make a font mgr with passed in fonts', () => {
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// CanvasKit.FontMgr.FromData([bungeeFontBuffer, notoSerifFontBuffer]) also works
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const fontMgr = CanvasKit.FontMgr.FromData(bungeeFontBuffer, notoSerifFontBuffer);
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expect(fontMgr).toBeTruthy();
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expect(fontMgr.countFamilies()).toBe(2);
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// in debug mode, let's list them.
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if (fontMgr.dumpFamilies) {
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fontMgr.dumpFamilies();
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}
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fontMgr.delete();
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});
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it('can make a font provider with passed in fonts and aliases', () => {
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const fontProvider = CanvasKit.TypefaceFontProvider.Make();
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fontProvider.registerFont(bungeeFontBuffer, "My Bungee Alias");
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fontProvider.registerFont(notoSerifFontBuffer, "My Noto Serif Alias");
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expect(fontProvider).toBeTruthy();
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expect(fontProvider.countFamilies()).toBe(2);
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// in debug mode, let's list them.
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if (fontProvider.dumpFamilies) {
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fontProvider.dumpFamilies();
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}
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fontProvider.delete();
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});
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gm('various_font_formats', (canvas, fetchedByteBuffers) => {
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const fontPaint = new CanvasKit.Paint();
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fontPaint.setAntiAlias(true);
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fontPaint.setStyle(CanvasKit.PaintStyle.Fill);
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const inputs = [{
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type: '.ttf font',
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buffer: bungeeFontBuffer,
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y: 60,
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},{
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type: '.otf font',
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buffer: fetchedByteBuffers[0],
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y: 90,
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},{
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type: '.woff font',
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buffer: fetchedByteBuffers[1],
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y: 120,
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},{
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type: '.woff2 font',
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buffer: fetchedByteBuffers[2],
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y: 150,
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}];
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const defaultFont = new CanvasKit.Font(null, 24);
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canvas.drawText(`The following should be ${inputs.length + 1} lines of text:`, 5, 30, fontPaint, defaultFont);
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for (const fontType of inputs) {
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// smoke test that the font bytes loaded.
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expect(fontType.buffer).toBeTruthy(fontType.type + ' did not load');
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const typeface = fontMgr.MakeTypefaceFromData(fontType.buffer);
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const font = new CanvasKit.Font(typeface, 24);
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if (font && typeface) {
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canvas.drawText(fontType.type + ' loaded', 5, fontType.y, fontPaint, font);
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} else {
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canvas.drawText(fontType.type + ' *not* loaded', 5, fontType.y, fontPaint, defaultFont);
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}
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font && font.delete();
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typeface && typeface.delete();
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}
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// The only ttc font I could find was 14 MB big, so I'm using the smaller test font,
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// which doesn't have very many glyphs in it, so we just check that we got a non-zero
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// typeface for it. I was able to load NotoSansCJK-Regular.ttc just fine in a
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// manual test.
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const typeface = fontMgr.MakeTypefaceFromData(fetchedByteBuffers[3]);
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expect(typeface).toBeTruthy('.ttc font');
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if (typeface) {
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canvas.drawText('.ttc loaded', 5, 180, fontPaint, defaultFont);
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typeface.delete();
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} else {
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canvas.drawText('.ttc *not* loaded', 5, 180, fontPaint, defaultFont);
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}
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defaultFont.delete();
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fontPaint.delete();
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fontMgr.delete();
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}, '/assets/Roboto-Regular.otf', '/assets/Roboto-Regular.woff', '/assets/Roboto-Regular.woff2', '/assets/test.ttc');
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it('can measure text very precisely with proper settings', () => {
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const typeface = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer);
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const fontSizes = [257, 100, 11];
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// The point of these values is to let us know 1) we can measure to sub-pixel levels
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// and 2) that measurements don't drastically change. If these change a little bit,
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// just update them with the new values. For super-accurate readings, one could
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// run a C++ snippet of code and compare the values, but that is likely unnecessary
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// unless we suspect a bug with the bindings.
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const expectedSizes = [241.06299, 93.79883, 10.31787];
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for (const idx in fontSizes) {
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const font = new CanvasKit.Font(typeface, fontSizes[idx]);
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font.setHinting(CanvasKit.FontHinting.None);
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font.setLinearMetrics(true);
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font.setSubpixel(true);
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const ids = font.getGlyphIDs('M');
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const widths = font.getGlyphWidths(ids);
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expect(widths[0]).toBeCloseTo(expectedSizes[idx], 5);
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font.delete();
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}
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typeface.delete();
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fontMgr.delete();
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});
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gm('font_edging', (canvas) => {
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// Draw a small font scaled up to see the aliasing artifacts.
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canvas.scale(8, 8);
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canvas.clear(CanvasKit.WHITE);
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const fontMgr = CanvasKit.FontMgr.RefDefault();
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const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer);
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const textPaint = new CanvasKit.Paint();
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const annotationFont = new CanvasKit.Font(notoSerif, 6);
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canvas.drawText('Default', 5, 5, textPaint, annotationFont);
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canvas.drawText('Alias', 5, 25, textPaint, annotationFont);
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canvas.drawText('AntiAlias', 5, 45, textPaint, annotationFont);
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canvas.drawText('Subpixel', 5, 65, textPaint, annotationFont);
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const testFont = new CanvasKit.Font(notoSerif, 20);
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canvas.drawText('SEA', 35, 15, textPaint, testFont);
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testFont.setEdging(CanvasKit.FontEdging.Alias);
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canvas.drawText('SEA', 35, 35, textPaint, testFont);
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testFont.setEdging(CanvasKit.FontEdging.AntiAlias);
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canvas.drawText('SEA', 35, 55, textPaint, testFont);
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testFont.setEdging(CanvasKit.FontEdging.SubpixelAntiAlias);
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canvas.drawText('SEA', 35, 75, textPaint, testFont);
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textPaint.delete();
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annotationFont.delete();
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testFont.delete();
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notoSerif.delete();
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fontMgr.delete();
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});
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});
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