@jbrowse/core
Version:
JBrowse 2 core libraries used by plugins
66 lines (65 loc) • 2.22 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ImageBitmapType = exports.createImageBitmap = exports.createCanvas = void 0;
exports.drawImageOntoCanvasContext = drawImageOntoCanvasContext;
const canvas_sequencer_1 = require("canvas-sequencer");
const detect_node_1 = __importDefault(require("detect-node"));
function drawImageOntoCanvasContext(imageData, context) {
if (imageData.serializedCommands) {
const seq = new canvas_sequencer_1.CanvasSequence(imageData.serializedCommands);
seq.execute(context);
}
else {
context.drawImage(imageData, 0, 0);
}
}
const weHave = {
realOffscreenCanvas: typeof OffscreenCanvas === 'function',
node: detect_node_1.default,
};
if (weHave.realOffscreenCanvas) {
exports.createCanvas = (width, height) => new OffscreenCanvas(width, height);
exports.createImageBitmap = window.createImageBitmap || self.createImageBitmap;
exports.ImageBitmapType = window.ImageBitmap || self.ImageBitmap;
}
else if (weHave.node) {
exports.createCanvas = (...args) => {
return nodeCreateCanvas(...args);
};
exports.createImageBitmap = async (canvas) => {
const dataUri = canvas.toDataURL();
const img = new nodeImage();
return new Promise((resolve, reject) => {
img.onload = () => {
resolve(img);
};
img.onerror = reject;
img.src = dataUri;
});
};
}
else {
exports.createCanvas = (width, height) => {
const context = new canvas_sequencer_1.CanvasSequence();
return {
width,
height,
getContext() {
return context;
},
};
};
exports.createImageBitmap = async (canvas) => {
const ctx = canvas.getContext('2d');
return {
height: canvas.height,
width: canvas.width,
serializedCommands: ctx.toJSON(),
containsNoTransferables: true,
};
};
exports.ImageBitmapType = String;
}