| describe('Font Behavior', () => { |
| let container; |
| |
| let notoSerifFontBuffer = null; |
| // This font is known to support kerning |
| const notoSerifFontLoaded = fetch('/assets/NotoSerif-Regular.ttf').then( |
| (response) => response.arrayBuffer()).then( |
| (buffer) => { |
| notoSerifFontBuffer = buffer; |
| }); |
| |
| let bungeeFontBuffer = null; |
| // This font has tofu for incorrect null terminators |
| // see https://bugs.chromium.org/p/skia/issues/detail?id=9314 |
| const bungeeFontLoaded = fetch('/assets/Bungee-Regular.ttf').then( |
| (response) => response.arrayBuffer()).then( |
| (buffer) => { |
| bungeeFontBuffer = buffer; |
| }); |
| |
| beforeEach(async () => { |
| await LoadCanvasKit; |
| await notoSerifFontLoaded; |
| await bungeeFontLoaded; |
| container = document.createElement('div'); |
| container.innerHTML = ` |
| <canvas width=600 height=600 id=test></canvas> |
| <canvas width=600 height=600 id=report></canvas>`; |
| document.body.appendChild(container); |
| }); |
| |
| afterEach(() => { |
| document.body.removeChild(container); |
| }); |
| |
| gm('text_shaping', (canvas) => { |
| const paint = new CanvasKit.SkPaint(); |
| |
| paint.setColor(CanvasKit.BLUE); |
| paint.setStyle(CanvasKit.PaintStyle.Stroke); |
| |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer); |
| |
| const textPaint = new CanvasKit.SkPaint(); |
| const textFont = new CanvasKit.SkFont(notoSerif, 20); |
| |
| canvas.drawRect(CanvasKit.LTRBRect(30, 30, 200, 200), paint); |
| canvas.drawText('This text is not shaped, and overflows the boundary', |
| 35, 50, textPaint, textFont); |
| |
| const shapedText = new CanvasKit.ShapedText({ |
| font: textFont, |
| leftToRight: true, |
| text: 'This text *is* shaped, and wraps to the right width.', |
| width: 160, |
| }); |
| const textBoxX = 35; |
| const textBoxY = 55; |
| canvas.drawText(shapedText, textBoxX, textBoxY, textPaint); |
| const bounds = shapedText.getBounds(); |
| |
| bounds.fLeft += textBoxX; |
| bounds.fRight += textBoxX; |
| bounds.fTop += textBoxY; |
| bounds.fBottom += textBoxY |
| |
| canvas.drawRect(bounds, paint); |
| const SHAPE_TEST_TEXT = 'VAVAVAVAVAFIfi'; |
| const textFont2 = new CanvasKit.SkFont(notoSerif, 60); |
| const shapedText2 = new CanvasKit.ShapedText({ |
| font: textFont2, |
| leftToRight: true, |
| text: SHAPE_TEST_TEXT, |
| width: 600, |
| }); |
| |
| canvas.drawText('no kerning ↓', 10, 240, textPaint, textFont); |
| canvas.drawText(SHAPE_TEST_TEXT, 10, 300, textPaint, textFont2); |
| canvas.drawText(shapedText2, 10, 300, textPaint); |
| canvas.drawText('kerning ↑', 10, 390, textPaint, textFont); |
| |
| paint.delete(); |
| notoSerif.delete(); |
| textPaint.delete(); |
| textFont.delete(); |
| shapedText.delete(); |
| textFont2.delete(); |
| shapedText2.delete(); |
| fontMgr.delete(); |
| }); |
| |
| gm('monospace_text_on_path', (canvas) => { |
| const paint = new CanvasKit.SkPaint(); |
| paint.setAntiAlias(true); |
| paint.setStyle(CanvasKit.PaintStyle.Stroke); |
| |
| const font = new CanvasKit.SkFont(null, 24); |
| const fontPaint = new CanvasKit.SkPaint(); |
| fontPaint.setAntiAlias(true); |
| fontPaint.setStyle(CanvasKit.PaintStyle.Fill); |
| |
| |
| const arc = new CanvasKit.SkPath(); |
| arc.arcTo(CanvasKit.LTRBRect(20, 40, 280, 300), -160, 140, true); |
| arc.lineTo(210, 140); |
| arc.arcTo(CanvasKit.LTRBRect(20, 0, 280, 260), 160, -140, true); |
| |
| // Only 1 dot should show up in the image, because we run out of path. |
| const str = 'This téxt should follow the curve across contours...'; |
| const textBlob = CanvasKit.SkTextBlob.MakeOnPath(str, arc, font); |
| |
| canvas.drawPath(arc, paint); |
| canvas.drawTextBlob(textBlob, 0, 0, fontPaint); |
| |
| textBlob.delete(); |
| arc.delete(); |
| paint.delete(); |
| font.delete(); |
| fontPaint.delete(); |
| }); |
| |
| gm('serif_text_on_path', (canvas) => { |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer); |
| |
| const paint = new CanvasKit.SkPaint(); |
| paint.setAntiAlias(true); |
| paint.setStyle(CanvasKit.PaintStyle.Stroke); |
| |
| const font = new CanvasKit.SkFont(notoSerif, 24); |
| const fontPaint = new CanvasKit.SkPaint(); |
| fontPaint.setAntiAlias(true); |
| fontPaint.setStyle(CanvasKit.PaintStyle.Fill); |
| |
| const arc = new CanvasKit.SkPath(); |
| arc.arcTo(CanvasKit.LTRBRect(20, 40, 280, 300), -160, 140, true); |
| arc.lineTo(210, 140); |
| arc.arcTo(CanvasKit.LTRBRect(20, 0, 280, 260), 160, -140, true); |
| |
| const str = 'This téxt should follow the curve across contours...'; |
| const textBlob = CanvasKit.SkTextBlob.MakeOnPath(str, arc, font, 60.5); |
| |
| canvas.drawPath(arc, paint); |
| canvas.drawTextBlob(textBlob, 0, 0, fontPaint); |
| |
| textBlob.delete(); |
| arc.delete(); |
| paint.delete(); |
| notoSerif.delete(); |
| font.delete(); |
| fontPaint.delete(); |
| fontMgr.delete(); |
| }); |
| |
| // https://bugs.chromium.org/p/skia/issues/detail?id=9314 |
| gm('nullterminators_skbug_9314', (canvas) => { |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const bungee = fontMgr.MakeTypefaceFromData(bungeeFontBuffer); |
| |
| // yellow, to make sure tofu is plainly visible |
| canvas.clear(CanvasKit.Color(255, 255, 0, 1)); |
| |
| const font = new CanvasKit.SkFont(bungee, 24); |
| const fontPaint = new CanvasKit.SkPaint(); |
| fontPaint.setAntiAlias(true); |
| fontPaint.setStyle(CanvasKit.PaintStyle.Fill); |
| |
| |
| const str = 'This is téxt'; |
| const textBlob = CanvasKit.SkTextBlob.MakeFromText(str + ' text blob', font); |
| |
| canvas.drawTextBlob(textBlob, 10, 50, fontPaint); |
| |
| canvas.drawText(str + ' normal', 10, 100, fontPaint, font); |
| |
| canvas.drawText('null terminator ->\u0000<- on purpose', 10, 150, fontPaint, font); |
| |
| textBlob.delete(); |
| bungee.delete(); |
| font.delete(); |
| fontPaint.delete(); |
| fontMgr.delete(); |
| }); |
| |
| it('can make a font mgr with passed in fonts', () => { |
| // CanvasKit.SkFontMgr.FromData([bungeeFontBuffer, notoSerifFontBuffer]) also works |
| const fontMgr = CanvasKit.SkFontMgr.FromData(bungeeFontBuffer, notoSerifFontBuffer); |
| expect(fontMgr).toBeTruthy(); |
| expect(fontMgr.countFamilies()).toBe(2); |
| // in debug mode, let's list them. |
| if (fontMgr.dumpFamilies) { |
| fontMgr.dumpFamilies(); |
| } |
| fontMgr.delete(); |
| }); |
| |
| gm('various_font_formats', (canvas, fetchedByteBuffers) => { |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const fontPaint = new CanvasKit.SkPaint(); |
| fontPaint.setAntiAlias(true); |
| fontPaint.setStyle(CanvasKit.PaintStyle.Fill); |
| const inputs = [{ |
| type: '.ttf font', |
| buffer: bungeeFontBuffer, |
| y: 60, |
| },{ |
| type: '.otf font', |
| buffer: fetchedByteBuffers[0], |
| y: 90, |
| },{ |
| // Not currently supported by Skia |
| type: '.woff font', |
| buffer: fetchedByteBuffers[1], |
| y: 120, |
| },{ |
| // Not currently supported by Skia |
| type: '.woff2 font', |
| buffer: fetchedByteBuffers[2], |
| y: 150, |
| }]; |
| |
| const defaultFont = new CanvasKit.SkFont(null, 24); |
| canvas.drawText(`The following should be ${inputs.length + 1} lines of text:`, 5, 30, fontPaint, defaultFont); |
| |
| for (const fontType of inputs) { |
| // smoke test that the font bytes loaded. |
| expect(fontType.buffer).toBeTruthy(fontType.type + ' did not load'); |
| |
| const typeface = fontMgr.MakeTypefaceFromData(fontType.buffer); |
| const font = new CanvasKit.SkFont(typeface, 24); |
| |
| if (font && typeface) { |
| canvas.drawText(fontType.type + ' loaded', 5, fontType.y, fontPaint, font); |
| } else { |
| canvas.drawText(fontType.type + ' *not* loaded', 5, fontType.y, fontPaint, defaultFont); |
| } |
| font && font.delete(); |
| typeface && typeface.delete(); |
| } |
| |
| // The only ttc font I could find was 14 MB big, so I'm using the smaller test font, |
| // which doesn't have very many glyphs in it, so we just check that we got a non-zero |
| // typeface for it. I was able to load NotoSansCJK-Regular.ttc just fine in a |
| // manual test. |
| const typeface = fontMgr.MakeTypefaceFromData(fetchedByteBuffers[3]); |
| expect(typeface).toBeTruthy('.ttc font'); |
| if (typeface) { |
| canvas.drawText('.ttc loaded', 5, 180, fontPaint, defaultFont); |
| typeface.delete(); |
| } else { |
| canvas.drawText('.ttc *not* loaded', 5, 180, fontPaint, defaultFont); |
| } |
| |
| defaultFont.delete(); |
| fontPaint.delete(); |
| fontMgr.delete(); |
| }, '/assets/Roboto-Regular.otf', '/assets/Roboto-Regular.woff', '/assets/Roboto-Regular.woff2', '/assets/test.ttc'); |
| |
| it('can measure text very precisely with proper settings', () => { |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const typeface = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer); |
| const fontSizes = [257, 100, 11]; |
| // The point of these values is to let us know 1) we can measure to sub-pixel levels |
| // and 2) that measurements don't drastically change. If these change a little bit, |
| // just update them with the new values. For super-accurate readings, one could |
| // run a C++ snippet of code and compare the values, but that is likely unnecessary |
| // unless we suspect a bug with the bindings. |
| const expectedSizes = [1178.71143, 458.64258, 50.450683]; |
| for (const idx in fontSizes) { |
| const font = new CanvasKit.SkFont(typeface, fontSizes[idx]); |
| font.setHinting(CanvasKit.FontHinting.None); |
| font.setLinearMetrics(true); |
| font.setSubpixel(true); |
| |
| const res = font.measureText('someText'); |
| expect(res).toBeCloseTo(expectedSizes[idx], 5); |
| font.delete(); |
| } |
| |
| typeface.delete(); |
| fontMgr.delete(); |
| }); |
| |
| gm('font_edging', (canvas) => { |
| // Draw a small font scaled up to see the aliasing artifacts. |
| canvas.scale(8, 8); |
| canvas.clear(CanvasKit.WHITE); |
| const fontMgr = CanvasKit.SkFontMgr.RefDefault(); |
| const notoSerif = fontMgr.MakeTypefaceFromData(notoSerifFontBuffer); |
| |
| const textPaint = new CanvasKit.SkPaint(); |
| const annotationFont = new CanvasKit.SkFont(notoSerif, 6); |
| |
| canvas.drawText('Default', 5, 5, textPaint, annotationFont); |
| canvas.drawText('Alias', 5, 25, textPaint, annotationFont); |
| canvas.drawText('AntiAlias', 5, 45, textPaint, annotationFont); |
| canvas.drawText('Subpixel', 5, 65, textPaint, annotationFont); |
| |
| const testFont = new CanvasKit.SkFont(notoSerif, 20); |
| |
| canvas.drawText('SEA', 35, 15, textPaint, testFont); |
| testFont.setEdging(CanvasKit.FontEdging.Alias); |
| canvas.drawText('SEA', 35, 35, textPaint, testFont); |
| testFont.setEdging(CanvasKit.FontEdging.AntiAlias); |
| canvas.drawText('SEA', 35, 55, textPaint, testFont); |
| testFont.setEdging(CanvasKit.FontEdging.SubpixelAntiAlias); |
| canvas.drawText('SEA', 35, 75, textPaint, testFont); |
| |
| textPaint.delete(); |
| annotationFont.delete(); |
| testFont.delete(); |
| notoSerif.delete(); |
| fontMgr.delete(); |
| }); |
| |
| }); |
