38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
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import * as WMF from '../';
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import * as fs from 'fs';
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Buffer; // this line is required by Parcel to pull in the buffer shim
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const data = fs.readFileSync("static/image1.wmf");
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const domelt/*: HTMLCanvasElement*/ = document.getElementById("canvas")/* as HTMLCanvasElement*/;
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const mode = window["MODE"] || "OFFSCREEN";
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console.log(mode);
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switch(mode) {
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case "DIRECT": {
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/* draw_canvas automatically resizes the canvas */
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WMF.draw_canvas(data, domelt);
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} break;
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case "INDIRECT": {
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const newelt = document.createElement("canvas");
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WMF.draw_canvas(data, newelt);
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/* the copy_canvas helper performs a resize of the new canvas */
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copy_canvas(domelt, newelt);
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} break;
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case "OFFSCREEN": {
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/* OffscreenCanvas requires the size beforehand */
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const size = WMF.image_size(data);
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const newelt = new OffscreenCanvas(size[0], size[1]);
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WMF.draw_canvas(data, newelt);
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copy_canvas(domelt, newelt);
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} break;
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}
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function copy_canvas(dst, src) {
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dst.height = src.height;
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dst.width = src.width;
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const ctxdst = dst.getContext('2d');
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const ctxsrc = src.getContext('2d');
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const imdata = ctxsrc.getImageData(0, 0, domelt.width, domelt.height);
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ctxdst.putImageData(imdata, 0, 0);
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}
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