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Merge pull request #2629 from ivanwonder/convert-color

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format color value to style '#rrggbbaa'
This commit is contained in:
Daniel Imms
2019-12-27 03:07:00 +11:00
committed by GitHub
parent 761c25fa6d c40df65d13
commit 5a17825b47
1 changed files with 9 additions and 22 deletions
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src/browser/ColorManager.ts
+9 -22
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@@ -184,34 +184,21 @@ export class ColorManager implements IColorManager {
);
return fallback;
}
let r: number;
let g: number;
let b: number;
let a: number;
let rgba: number;
if (css.length === 5) {
const num = parseInt(css.substr(1), 16);
r = ((num >> 12) & 0xF) * 16;
g = ((num >> 8) & 0xF) * 16;
b = ((num >> 4) & 0xF) * 16;
a = (num & 0xF) * 16;
rgba = toRgba(r, g, b, a);
} else {
rgba = parseInt(css.substr(1), 16);
r = (rgba >> 24) & 0xFF;
g = (rgba >> 16) & 0xFF;
b = (rgba >> 8) & 0xFF;
a = (rgba ) & 0xFF;
}
// https://html.spec.whatwg.org/multipage/canvas.html#serialisation-of-a-color
// the color value has alpha less than 1.0, and the string is the color value in the CSS rgba()
const [r, g, b, a] = this._ctx.fillStyle.substring(5, this._ctx.fillStyle.length - 1).split(',').map(component => Number(component));
const alpha = Math.round(a * 255);
const rgba: number = toRgba(r, g, b, alpha);
return {
rgba,
css: toCss(r, g, b, a)
css: toCss(r, g, b, alpha)
};
}
return {
css,
// https://html.spec.whatwg.org/multipage/canvas.html#serialisation-of-a-color
// if it has alpha equal to 1.0, then the string is a lowercase six-digit hex value, prefixed with a "#" character
css: this._ctx.fillStyle,
rgba: toRgba(data[0], data[1], data[2], data[3])
};
}