Function setPatternnSource

src/util/decal.ts:99–304

(pattern: PatternObject)

    return pattern;

    function setPatternnSource(pattern: PatternObject) {
        const keys = [dpr];
        let isValidKey = true;
        for (let i = 0; i < decalKeys.length; ++i) {
            const value = (decalOpt as any)[decalKeys[i]];
            if (value != null
                && !isArray(value)
                && !isString(value)
                && !isNumber(value)
                && typeof value !== 'boolean'
            ) {
                isValidKey = false;
                break;
            }
            keys.push(value);
        }

        let cacheKey;
        if (isValidKey) {
            cacheKey = keys.join(',') + (isSVG ? '-svg' : '');
            const cache = decalCache.get(cacheKey);
            if (cache) {
                isSVG ? (pattern as SVGPatternObject).svgElement = cache as SVGVNode
                    : (pattern as ImagePatternObject).image = cache as HTMLCanvasElement;
            }
        }

        const dashArrayX = normalizeDashArrayX(decalOpt.dashArrayX);
        const dashArrayY = normalizeDashArrayY(decalOpt.dashArrayY);
        const symbolArray = normalizeSymbolArray(decalOpt.symbol);
        const lineBlockLengthsX = getLineBlockLengthX(dashArrayX);
        const lineBlockLengthY = getLineBlockLengthY(dashArrayY);

        const canvas = !isSVG && platformApi.createCanvas();
        const svgRoot: SVGVNode = isSVG && {
            tag: 'g',
            attrs: {},
            key: 'dcl',
            children: []
        };
        const pSize = getPatternSize();
        let ctx: CanvasRenderingContext2D;
        if (canvas) {
            canvas.width = pSize.width * dpr;
            canvas.height = pSize.height * dpr;
            ctx = canvas.getContext('2d');
        }
        brushDecal();

        if (isValidKey) {
            decalCache.put(cacheKey, canvas || svgRoot);
        }

        (pattern as ImagePatternObject).image = canvas;
        (pattern as SVGPatternObject).svgElement = svgRoot;
        (pattern as SVGPatternObject).svgWidth = pSize.width;
        (pattern as SVGPatternObject).svgHeight = pSize.height;