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@ -13,7 +13,7 @@ import { FileSystemHandle, nativeFileSystemSupported } from "./filesystem";
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import { isValidExcalidrawData, isValidLibrary } from "./json";
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import { restore, restoreLibraryItems } from "./restore";
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import { ImportedLibraryData } from "./types";
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import { PNG } from "pngjs/browser";
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import UPNG from "upng-js";
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const parseFileContents = async (blob: Blob | File) => {
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let contents: string;
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@ -234,81 +234,26 @@ const _canvasToBlob = async (canvas: HTMLCanvasElement): Promise<Blob> => {
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export const canvasToBlob = async (
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canvas: HTMLCanvasElement,
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): Promise<Blob> => {
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const tileWidth = 1000;
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const tileHeight = 1000;
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const tileDataArray: Uint8ClampedArray[][] = []; // Two-dimensional array to store tile data
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const { width: canvasWidth, height: canvasHeight } = canvas;
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const ctx = canvas.getContext("2d");
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if (!ctx) {
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throw new Error("No canvas context");
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}
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// Function to process each tile
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function processTile(tileX: number, tileY: number) {
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// Calculate the starting and ending coordinates for the tile
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const startX = tileX * tileWidth;
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const startY = tileY * tileHeight;
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const endX = Math.min(startX + tileWidth, canvasWidth);
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const endY = Math.min(startY + tileHeight, canvasHeight);
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// Get the image data for the tile directly from the main canvas
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const imageData = ctx!.getImageData(
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startX,
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startY,
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endX - startX,
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endY - startY,
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).data;
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// Store the tile data in the two-dimensional array
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tileDataArray[tileY] = tileDataArray[tileY] || [];
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tileDataArray[tileY][tileX] = imageData;
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}
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console.time("getImageData");
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const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height).data;
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console.timeEnd("getImageData");
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console.time("tiling");
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// Iterate over the tiles and process each one
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for (let tileY = 0; tileY < canvasHeight / tileHeight; tileY++) {
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for (let tileX = 0; tileX < canvasWidth / tileWidth; tileX++) {
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processTile(tileX, tileY);
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}
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}
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console.timeEnd("tiling");
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console.time("create png");
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// Create a new PNG image with the final dimensions
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const finalImage = new PNG({ width: canvasWidth, height: canvasHeight });
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console.timeEnd("create png");
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console.time("concat tiles");
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// Merge the tiles into the final image
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for (let tileY = 0; tileY < canvasHeight / tileHeight; tileY++) {
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for (let tileX = 0; tileX < canvasWidth / tileWidth; tileX++) {
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const imageData = tileDataArray[tileY][tileX];
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const destX = tileX * tileWidth;
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const destY = tileY * tileHeight;
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// Copy the pixels from the tile to the final image
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for (let y = 0; y < tileHeight; y++) {
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for (let x = 0; x < tileWidth; x++) {
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const index = (y * tileWidth + x) * 4;
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const destIndex = ((destY + y) * canvasWidth + destX + x) * 4;
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finalImage.data[destIndex] = imageData[index];
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finalImage.data[destIndex + 1] = imageData[index + 1];
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finalImage.data[destIndex + 2] = imageData[index + 2];
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finalImage.data[destIndex + 3] = imageData[index + 3];
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}
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}
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}
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}
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console.timeEnd("concat tiles");
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console.time("create buffer");
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const buffer = PNG.sync.write(finalImage);
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console.timeEnd("create buffer");
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console.time("encode");
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const pngData = UPNG.encode(
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[imageData.buffer],
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canvas.width,
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canvas.height,
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0,
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);
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console.timeEnd("encode");
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return new Blob([buffer], { type: "image/png" });
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return new Blob([pngData], { type: "image/png" });
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};
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/** generates SHA-1 digest from supplied file (if not supported, falls back
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Arnošt Pleskot
2 years ago