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Add a support for parsing hsl() and hsla() color formats. #188

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Add a support for parsing hsl() and hsla() color formats. #188

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15568ac
Add a support for parsing `hsl()` and `hsla()` color formats.
petrkotek Jul 6, 2024
e3bc2d9
Support the optional "deg" in the hue argument of hsl() and hsla().
petrkotek Nov 12, 2024
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45 changes: 45 additions & 0 deletions source.js
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Original file line number Diff line number Diff line change
Expand Up @@ -469,6 +469,41 @@ var SVGtoPDF = function(doc, svg, x, y, options) {
}));
}
function parseColor(raw) {
/**
* Converts an HSL color value to RGB. Conversion formula
* adapted from https://en.wikipedia.org/wiki/HSL_color_space.
* Assumes h, s, and l are contained in the set [0, 1] and
* returns r, g, and b in the set [0, 255].
*
* @param {number} h The hue
* @param {number} s The saturation
* @param {number} l The lightness
* @return {Array} The RGB representation
*/
function hslToRgb(h, s, l) {
let r, g, b;

if (s === 0) {
r = g = b = l; // achromatic
} else {
const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
const p = 2 * l - q;
r = hueToRgb(p, q, h + 1/3);
g = hueToRgb(p, q, h);
b = hueToRgb(p, q, h - 1/3);
}

return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}

function hueToRgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1/6) return p + (q - p) * 6 * t;
if (t < 1/2) return q;
if (t < 2/3) return p + (q - p) * (2/3 - t) * 6;
return p;
}
let temp, result;
raw = (raw || '').trim();
if (temp = NamedColors[raw]) {
Expand All @@ -493,6 +528,16 @@ var SVGtoPDF = function(doc, svg, x, y, options) {
if (temp[1] < 256 && temp[2] < 256 && temp[3] < 256) {
result = [temp.slice(1, 4), 1];
}
} else if (temp = raw.match(/^hsl\(\s*([0-9]+)(deg)?\s*,\s*([0-9]+)%\s*,\s*([0-9]+)%\s*\)$/i)) {
temp[1] = parseInt(temp[1]); temp[3] = parseInt(temp[3]); temp[4] = parseInt(temp[4]);
if (temp[1] <= 360 && temp[3] <= 100 && temp[4] <= 100) {
result = [hslToRgb(temp[1]/360, temp[3]/100, temp[4]/100), 1];
}
} else if (temp = raw.match(/^hsla\(\s*([0-9]+)(deg)?\s*,\s*([0-9]+)%\s*,\s*([0-9]+)%\s*,\s*([0-9.]+)\s*\)$/i)) {
temp[1] = parseInt(temp[1]); temp[3] = parseInt(temp[3]); temp[4] = parseInt(temp[4]); temp[5] = parseFloat(temp[5]);
if (temp[1] <= 360 && temp[3] <= 100 && temp[4] <= 100 && temp[5] <= 1) {
result = [hslToRgb(temp[1]/360, temp[3]/100, temp[4]/100), temp[5]];
}
} else if (temp = raw.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i)) {
result = [[parseInt(temp[1], 16), parseInt(temp[2], 16), parseInt(temp[3], 16)], 1];
} else if (temp = raw.match(/^#([0-9a-f])([0-9a-f])([0-9a-f])$/i)) {
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