smig/excalidraw
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support embedding scene data to PNG/SVG (#2219)

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Co-authored-by: Lipis <lipiridis@gmail.com>
This commit is contained in:
David Luzar 2020-10-13 14:47:07 +02:00 • committed by GitHub
parent 7618ca48d7
commit 5950fa9a40
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GPG key ID: 4AEE18F83AFDEB23
20 changed files with 329 additions and 27 deletions
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28
src/data/index.ts
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@ -19,6 +19,8 @@ import { serializeAsJSON } from "./json";
import { ExportType } from "../scene/types";
import { restore } from "./restore";
import { ImportedDataState } from "./types";
import { MIME_TYPES } from "../constants";
import { stringToBase64 } from "../base64";
export { loadFromBlob } from "./blob";
export { saveAsJSON, loadFromJSON } from "./json";
@ -300,11 +302,21 @@ export const exportCanvas = async (
return window.alert(t("alerts.cannotExportEmptyCanvas"));
}
if (type === "svg" || type === "clipboard-svg") {
let metadata = "";
if (appState.exportEmbedScene && type === "svg") {
metadata += `<!-- payload-type:${MIME_TYPES.excalidraw} -->`;
metadata += "<!-- payload-start -->";
metadata += await stringToBase64(serializeAsJSON(elements, appState));
metadata += "<!-- payload-end -->";
}
const tempSvg = exportToSvg(elements, {
exportBackground,
viewBackgroundColor,
exportPadding,
shouldAddWatermark,
metadata,
});
if (type === "svg") {
await fileSave(new Blob([tempSvg.outerHTML], { type: "image/svg+xml" }), {
@ -330,8 +342,22 @@ export const exportCanvas = async (
if (type === "png") {
const fileName = `${name}.png`;
tempCanvas.toBlob(async (blob: any) => {
tempCanvas.toBlob(async (blob) => {
if (blob) {
if (appState.exportEmbedScene) {
const { default: tEXt } = await import("png-chunk-text");
const { default: encodePng } = await import("png-chunks-encode");
const { default: decodePng } = await import("png-chunks-extract");
const chunks = decodePng(new Uint8Array(await blob.arrayBuffer()));
const metadata = tEXt.encode(
MIME_TYPES.excalidraw,
serializeAsJSON(elements, appState),
);
// insert metadata before last chunk (iEND)
chunks.splice(-1, 0, metadata);
blob = new Blob([encodePng(chunks)], { type: "image/png" });
}
await fileSave(blob, {
fileName: fileName,
extensions: [".png"],