import { uid } from '@pixi/utils';
import { BaseImageResource } from './BaseImageResource';
/**
* Resource type for SVG elements and graphics.
* @class
* @extends PIXI.resources.BaseImageResource
* @memberof PIXI.resources
* @param {string} source - Base64 encoded SVG element or URL for SVG file.
* @param {object} [options] - Options to use
* @param {number} [options.scale=1] - Scale to apply to SVG. Overridden by...
* @param {number} [options.width] - Rasterize SVG this wide. Aspect ratio preserved if height not specified.
* @param {number} [options.height] - Rasterize SVG this high. Aspect ratio preserved if width not specified.
* @param {boolean} [options.autoLoad=true] - Start loading right away.
*/
export class SVGResource extends BaseImageResource {
constructor(sourceBase64, options) {
options = options || {};
super(document.createElement('canvas'));
this._width = 0;
this._height = 0;
/**
* Base64 encoded SVG element or URL for SVG file
* @readonly
* @member {string}
*/
this.svg = sourceBase64;
/**
* The source scale to apply when rasterizing on load
* @readonly
* @member {number}
*/
this.scale = options.scale || 1;
/**
* A width override for rasterization on load
* @readonly
* @member {number}
*/
this._overrideWidth = options.width;
/**
* A height override for rasterization on load
* @readonly
* @member {number}
*/
this._overrideHeight = options.height;
/**
* Call when completely loaded
* @private
* @member {function}
*/
this._resolve = null;
/**
* Cross origin value to use
* @private
* @member {boolean|string}
*/
this._crossorigin = options.crossorigin;
/**
* Promise when loading
* @member {Promise<void>}
* @private
* @default null
*/
this._load = null;
if (options.autoLoad !== false) {
this.load();
}
}
load() {
if (this._load) {
return this._load;
}
this._load = new Promise((resolve) => {
// Save this until after load is finished
this._resolve = () => {
this.resize(this.source.width, this.source.height);
resolve(this);
};
// Convert SVG inline string to data-uri
if ((/^\<svg/).test(this.svg.trim())) {
if (!btoa) {
throw new Error('Your browser doesn\'t support base64 conversions.');
}
this.svg = `data:image/svg+xml;base64,${btoa(unescape(encodeURIComponent(this.svg)))}`;
}
this._loadSvg();
});
return this._load;
}
/**
* Loads an SVG image from `imageUrl` or `data URL`.
*
* @private
*/
_loadSvg() {
const tempImage = new Image();
BaseImageResource.crossOrigin(tempImage, this.svg, this._crossorigin);
tempImage.src = this.svg;
tempImage.onerror = (event) => {
if (!this._resolve) {
return;
}
tempImage.onerror = null;
this.onError.emit(event);
};
tempImage.onload = () => {
if (!this._resolve) {
return;
}
const svgWidth = tempImage.width;
const svgHeight = tempImage.height;
if (!svgWidth || !svgHeight) {
throw new Error('The SVG image must have width and height defined (in pixels), canvas API needs them.');
}
// Set render size
let width = svgWidth * this.scale;
let height = svgHeight * this.scale;
if (this._overrideWidth || this._overrideHeight) {
width = this._overrideWidth || this._overrideHeight / svgHeight * svgWidth;
height = this._overrideHeight || this._overrideWidth / svgWidth * svgHeight;
}
width = Math.round(width);
height = Math.round(height);
// Create a canvas element
const canvas = this.source;
canvas.width = width;
canvas.height = height;
canvas._pixiId = `canvas_${uid()}`;
// Draw the Svg to the canvas
canvas
.getContext('2d')
.drawImage(tempImage, 0, 0, svgWidth, svgHeight, 0, 0, width, height);
this._resolve();
this._resolve = null;
};
}
/**
* Get size from an svg string using regexp.
*
* @method
* @param {string} svgString - a serialized svg element
* @return {PIXI.ISize} image extension
*/
static getSize(svgString) {
const sizeMatch = SVGResource.SVG_SIZE.exec(svgString);
const size = {};
if (sizeMatch) {
size[sizeMatch[1]] = Math.round(parseFloat(sizeMatch[3]));
size[sizeMatch[5]] = Math.round(parseFloat(sizeMatch[7]));
}
return size;
}
/**
* Destroys this texture
* @override
*/
dispose() {
super.dispose();
this._resolve = null;
this._crossorigin = null;
}
/**
* Used to auto-detect the type of resource.
*
* @static
* @param {*} source - The source object
* @param {string} extension - The extension of source, if set
*/
static test(source, extension) {
// url file extension is SVG
return extension === 'svg'
// source is SVG data-uri
|| (typeof source === 'string' && (/^data:image\/svg\+xml(;(charset=utf8|utf8))?;base64/).test(source))
// source is SVG inline
|| (typeof source === 'string' && source.indexOf('<svg') === 0);
}
}
/**
* RegExp for SVG size.
*
* @static
* @constant {RegExp|string} SVG_SIZE
* @memberof PIXI.resources.SVGResource
* @example <svg width="100" height="100"></svg>
*/
SVGResource.SVG_SIZE = /<svg[^>]*(?:\s(width|height)=('|")(\d*(?:\.\d+)?)(?:px)?('|"))[^>]*(?:\s(width|height)=('|")(\d*(?:\.\d+)?)(?:px)?('|"))[^>]*>/i; // eslint-disable-line max-len