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add repeat to radialGradient #2

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add repeat to radialGradient #2

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41 changes: 30 additions & 11 deletions src/render/canvas/canvas-renderer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ import {
parsePathForBorderDoubleOuter,
parsePathForBorderStroke
} from '../border';
import {calculateBackgroundRendering, getBackgroundValueForIndex} from '../background';
import {calculateBackgroundRendering, calculateBackgroundRepeatPath, getBackgroundValueForIndex} from '../background';
import {isDimensionToken} from '../../css/syntax/parser';
import {TextBounds} from '../../css/layout/text';
import {ImageElementContainer} from '../../dom/replaced-elements/image-element-container';
Expand Down Expand Up @@ -633,36 +633,55 @@ export class CanvasRenderer extends Renderer {
null,
null
]);

const newBounds = new Bounds(0, 0, width, height);
const normalisedPath = calculateBackgroundRepeatPath(
getBackgroundValueForIndex(container.styles.backgroundRepeat, index),
[0, 0],
[width, height],
newBounds,
newBounds
);
const position = backgroundImage.position.length === 0 ? [FIFTY_PERCENT] : backgroundImage.position;
const x = getAbsoluteValue(position[0], width);
const y = getAbsoluteValue(position[position.length - 1], height);

const canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;

const [rx, ry] = calculateRadius(backgroundImage, x, y, width, height);
if (rx > 0 && ry > 0) {
const radialGradient = this.ctx.createRadialGradient(left + x, top + y, 0, left + x, top + y, rx);
const radialGradient = ctx.createRadialGradient(0 + x, 0 + y, 0, 0 + x, 0 + y, rx);

processColorStops(backgroundImage.stops, rx * 2).forEach((colorStop) =>
radialGradient.addColorStop(colorStop.stop, asString(colorStop.color))
);

this.path(path);
this.ctx.fillStyle = radialGradient;
this.path.bind({ctx, formatPath: this.formatPath.bind({ctx})})(normalisedPath);
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The fact that you need to use bind seem suspicious. Can't we use arrow functions instead?

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I'll try take a look, this I believe was a workaround because background (html2canvas) didn't allow arguments again long time ago I'll take a look

ctx.fillStyle = radialGradient;
if (rx !== ry) {
// transforms for elliptical radial gradient
const midX = container.bounds.left + 0.5 * container.bounds.width;
const midY = container.bounds.top + 0.5 * container.bounds.height;
const f = ry / rx;
const invF = 1 / f;

this.ctx.save();
this.ctx.translate(midX, midY);
this.ctx.transform(1, 0, 0, f, 0, 0);
this.ctx.translate(-midX, -midY);
ctx.save();
ctx.translate(midX, midY);
ctx.transform(1, 0, 0, f, 0, 0);
ctx.translate(-midX, -midY);

this.ctx.fillRect(left, invF * (top - midY) + midY, width, height * invF);
this.ctx.restore();
ctx.fillRect(0, invF * (0 - midY) + midY, width, height * invF);
ctx.restore();
} else {
this.ctx.fill();
ctx.fill();
}

if (width > 0 && height > 0) {
const pattern = this.ctx.createPattern(canvas, 'repeat') as CanvasPattern;
this.renderRepeat(path, pattern, left, top);
}
}
}
Expand Down
18 changes: 18 additions & 0 deletions tests/reftests/background/repeat.html
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Expand Up @@ -35,6 +35,21 @@
display:block;
}

div.psudo-after::before {
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psudo?

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Typo likely, pr is pretty old now. I'll spend some time and clean up bits.

background-image: radial-gradient(circle, #6ca233 30%, rgba(255, 255, 255, 0) 0%);
background-position: center;
background-size: 10px 10px;
background-repeat: repeat-y;
height: calc(20% - 50px + 25px);
z-index: 1;
content: "";
position: absolute;
width: 5px;
left: 35px;
}



</style>

</head>
Expand All @@ -53,5 +68,8 @@
<div style="background:url(../../assets/image.jpg) no-repeat;"></div>
</div>

<div class="psudo-after">
</div>

</body>
</html>