change scaling algorithm also for first tile layer caluclated out of
chunks
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parent
727676f0f8
commit
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108
src/core/Tile.js
108
src/core/Tile.js
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@ -20,6 +20,7 @@ import { TILE_SIZE, TILE_ZOOM_LEVEL } from './constants';
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/*
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* Deletes a subtile from a tile (paints it in color 0),
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* if we wouldn't do it, it would be black
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* @param tileSize size of the tile within the chunk
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* @param palette Palette to use
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* @param subtilesInTile how many subtiles are in a tile (per dimension)
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* @param cell subtile to delete [dx, dy]
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@ -34,16 +35,14 @@ function deleteSubtilefromTile(
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) {
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const [dx, dy] = cell;
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const offset = (dx + dy * tileSize * subtilesInTile) * tileSize;
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const [blankR, blankG, blankB] = palette.rgb;
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for (let row = 0; row < tileSize; row += 1) {
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let channelOffset = (offset + row * tileSize * subtilesInTile) * 3;
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const max = channelOffset + tileSize * 3;
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while (channelOffset < max) {
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// eslint-disable-next-line prefer-destructuring
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buffer[channelOffset++] = palette.rgb[0];
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// eslint-disable-next-line prefer-destructuring
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buffer[channelOffset++] = palette.rgb[1];
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// eslint-disable-next-line prefer-destructuring
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buffer[channelOffset++] = palette.rgb[2];
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buffer[channelOffset++] = blankR;
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buffer[channelOffset++] = blankG;
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buffer[channelOffset++] = blankB;
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}
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}
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}
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@ -56,7 +55,7 @@ function addShrunkenSubtileToTile(
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) {
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const tileSize = TILE_SIZE;
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const [dx, dy] = cell;
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const chunkOffset = (dx + dy * subtilesInTile * tileSize / 4) * tileSize / 4;
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const offset = (dx + dy * subtilesInTile * tileSize / 4) * tileSize / 4;
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const target = tileSize / 4;
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let tr;
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let tg;
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@ -65,7 +64,7 @@ function addShrunkenSubtileToTile(
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let tmp;
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const linePad = (tileSize * 3 - 1) * 3;
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for (let row = 0; row < target; row += 1) {
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let channelOffset = (chunkOffset + row * target * subtilesInTile) * 3;
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let channelOffset = (offset + row * target * subtilesInTile) * 3;
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const max = channelOffset + target * 3;
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pos = row * tileSize * 12;
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while (channelOffset < max) {
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@ -81,6 +80,85 @@ function addShrunkenSubtileToTile(
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}
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}
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function addShrunkenIndexedSubtilesToTile(
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palette,
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tileSize,
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subtilesInTile,
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cell,
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inpTile,
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buffer,
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) {
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const [dx, dy] = cell;
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const subtileSize = tileSize / subtilesInTile;
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const inpTileLength = inpTile.length;
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const offset = (dx + dy * tileSize) * subtileSize;
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const { rgb } = palette;
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let tr;
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let tg;
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let tb;
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let channelOffset;
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let posA;
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let posB;
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let clr;
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const linePad = (tileSize + 1) * (subtilesInTile - 1);
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let amountFullRows = Math.floor(inpTileLength / subtilesInTile);
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/*
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* use available data
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*/
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for (let row = 0; row < amountFullRows; row += 1) {
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channelOffset = (offset + row * tileSize) * 3;
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const max = channelOffset + subtileSize * 3;
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posA = row * tileSize * subtilesInTile;
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posB = posA + linePad;
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while (channelOffset < max) {
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clr = (inpTile[posA] & 0x3F) * 3;
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tr = rgb[clr++];
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tg = rgb[clr++];
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tb = rgb[clr];
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posA += subtilesInTile;
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clr = (inpTile[posB] & 0x3F) * 3;
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buffer[channelOffset++] = (rgb[clr++] + tr) / 2;
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buffer[channelOffset++] = (rgb[clr++] + tg) / 2;
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buffer[channelOffset++] = (rgb[clr] + tb) / 2;
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posB += subtilesInTile;
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}
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}
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/*
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* padding the rest
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*/
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[tr, tg, tb] = rgb;
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if (inpTileLength % subtilesInTile) {
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channelOffset = (offset + amountFullRows * tileSize) * 3;
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const max = channelOffset + subtileSize * 3;
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posA = amountFullRows * tileSize * subtilesInTile;
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while (channelOffset < max) {
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if (posA < inpTileLength) {
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clr = (inpTile[posA] & 0x3F) * 3;
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buffer[channelOffset++] = (rgb[clr++] + tr) / 2;
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buffer[channelOffset++] = (rgb[clr++] + tg) / 2;
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buffer[channelOffset++] = (rgb[clr] + tb) / 2;
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posA += subtilesInTile;
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} else {
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buffer[channelOffset++] = tr;
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buffer[channelOffset++] = tg;
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buffer[channelOffset++] = tb;
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}
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}
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amountFullRows += 1;
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}
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if (amountFullRows < subtileSize) {
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for (let row = amountFullRows; row < subtileSize; row += 1) {
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channelOffset = (offset + row * tileSize) * 3;
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const max = channelOffset + subtileSize * 3;
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while (channelOffset < max) {
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buffer[channelOffset++] = tr;
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buffer[channelOffset++] = tg;
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buffer[channelOffset++] = tb;
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}
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}
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}
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}
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/*
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* @param subtilesInTile how many subtiles are in a tile (per dimension)
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* @param cell where to add the tile [dx, dy]
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@ -181,7 +259,7 @@ export async function createZoomTileFromChunk(
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const [x, y] = cell;
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const maxTiledZoom = getMaxTiledZoom(canvasSize);
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const tileRGBBuffer = new Uint8Array(
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TILE_SIZE * TILE_SIZE * TILE_ZOOM_LEVEL * TILE_ZOOM_LEVEL * 3,
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TILE_SIZE * TILE_SIZE * 3,
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);
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const startTime = Date.now();
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@ -207,8 +285,9 @@ export async function createZoomTileFromChunk(
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na.push([dx, dy]);
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continue;
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}
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addIndexedSubtiletoTile(
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addShrunkenIndexedSubtilesToTile(
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palette,
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TILE_SIZE,
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TILE_ZOOM_LEVEL,
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[dx, dy],
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chunk,
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@ -219,19 +298,18 @@ export async function createZoomTileFromChunk(
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if (na.length !== TILE_ZOOM_LEVEL * TILE_ZOOM_LEVEL) {
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na.forEach((element) => {
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deleteSubtilefromTile(TILE_SIZE, palette, TILE_ZOOM_LEVEL, element, tileRGBBuffer);
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deleteSubtilefromTile(TILE_SIZE / TILE_ZOOM_LEVEL, palette, TILE_ZOOM_LEVEL, element, tileRGBBuffer);
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});
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const filename = tileFileName(canvasTileFolder, [maxTiledZoom - 1, x, y]);
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try {
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await sharp(Buffer.from(tileRGBBuffer.buffer), {
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raw: {
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width: TILE_SIZE * TILE_ZOOM_LEVEL,
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height: TILE_SIZE * TILE_ZOOM_LEVEL,
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width: TILE_SIZE,
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height: TILE_SIZE,
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channels: 3,
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},
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})
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.resize(TILE_SIZE)
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.png({ options: { compressionLevel: 6 } })
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.toFile(filename);
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} catch (error) {
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@ -291,7 +369,7 @@ export async function createZoomedTile(
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if (na.length !== TILE_ZOOM_LEVEL * TILE_ZOOM_LEVEL) {
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na.forEach((element) => {
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deleteSubtilefromTile(TILE_SIZE / 4, palette, TILE_ZOOM_LEVEL, element, tileRGBBuffer);
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deleteSubtilefromTile(TILE_SIZE / TILE_ZOOM_LEVEL, palette, TILE_ZOOM_LEVEL, element, tileRGBBuffer);
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});
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const filename = tileFileName(canvasTileFolder, [z, x, y]);
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