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BackgroundResource,
CompressedBackgroundResource,
CompressedProjectResources,
CompressedSceneResourceWithChildren,
ProjectResources,
SceneResource,
TilesetResource,
CompressedTilesetResource,
} from "shared/lib/resources/types";
import { pruneTilemapLayersTilesets } from "shared/lib/tiles/sceneTilemapData";
export const compress8bitNumberArray = (arr: number[] | undefined): string => {
if (!arr) {
return "";
}
let lastValue = -1;
let output = "";
let count = 0;
for (let i = 0; i < arr.length; i++) {
if (arr[i] !== lastValue) {
if (count === 1) {
output += "!";
} else if (count > 0) {
output += `${count.toString(16)}+`;
}
count = 0;
lastValue = arr[i];
output += (lastValue % 256).toString(16).padStart(2, "0");
}
count++;
}
if (count === 1) {
output += "!";
} else if (count > 0) {
output += `${count.toString(16)}+`;
}
return output;
};
export const decompress8bitNumberString = (str: string): number[] => {
const arr: number[] = [];
let i = 0;
while (i < str.length) {
// Read the value
const value = parseInt(str.slice(i, i + 2), 16);
i += 2;
let count = 1;
if (i < str.length) {
if (str[i] === "!") {
// Single occurrence
count = 1;
i++;
} else {
// Read the count
const countStart = i;
const countEnd = str.indexOf("+", countStart);
if (countStart === countEnd || countEnd === -1) {
// No count or no end of count marker found - string was invalid
return [];
}
count = parseInt(str.slice(countStart, countEnd), 16);
i = countEnd + 1;
}
} else {
// value was missing count / markers - string was invalid
return [];
}
// Add the value `count` times to the array
for (let j = 0; j < count; j++) {
arr.push(value);
}
}
return arr;
};
export const compressNumberArray = (arr: number[] | undefined): string => {
if (!arr?.length) {
return "";
}
let lastValue = 0;
let hasLastValue = false;
let output = "";
let count = 0;
for (const value of arr) {
if (!hasLastValue || value !== lastValue) {
if (hasLastValue) {
if (output) {
output += ";";
}
output += lastValue.toString(36);
if (count > 1) {
output += `:${count.toString(36)}`;
}
}
lastValue = value;
hasLastValue = true;
count = 0;
}
count++;
}
Eif (hasLastValue) {
if (output) {
output += ";";
}
output += lastValue.toString(36);
if (count > 1) {
output += `:${count.toString(36)}`;
}
}
return output;
};
export const decompressNumberString = (str: string): number[] => {
if (!str) {
return [];
}
const arr: number[] = [];
for (const part of str.split(";")) {
const pieces = part.split(":");
if (pieces.length > 2 || pieces[0] === "") {
return [];
}
const value = Number.parseInt(pieces[0], 36);
const count = pieces.length === 1 ? 1 : Number.parseInt(pieces[1], 36);
if (
!Number.isSafeInteger(value) ||
!Number.isSafeInteger(count) ||
count < 1
) {
return [];
}
for (let j = 0; j < count; j++) {
arr.push(value);
}
}
return arr;
};
const decompressSceneResource = (
scene: CompressedSceneResourceWithChildren,
): SceneResource => {
return {
...scene,
collisions: decompress8bitNumberString(scene.collisions),
tilemap: scene.tilemap
? {
...scene.tilemap,
tileColors: scene.tilemap.tileColors
? decompress8bitNumberString(scene.tilemap.tileColors)
: undefined,
layers: scene.tilemap.layers.map((layer) => ({
...layer,
tiles: decompressNumberString(layer.tiles),
autotiles: layer.autotiles
? decompressNumberString(layer.autotiles)
: undefined,
})),
}
: undefined,
};
};
const decompressBackgroundResource = (
background: CompressedBackgroundResource,
): BackgroundResource => {
return {
...background,
tileColors: decompress8bitNumberString(background.tileColors),
};
};
const decompressTilesetResource = (
tileset: CompressedTilesetResource,
): TilesetResource => ({
...tileset,
tileColors: tileset.tileColors
? decompressNumberString(tileset.tileColors)
: [],
tileCollisions: tileset.tileCollisions
? decompressNumberString(tileset.tileCollisions)
: [],
});
export const decompressProjectResources = (
compressedResources: CompressedProjectResources,
): ProjectResources => {
return {
...compressedResources,
scenes: compressedResources.scenes.map(decompressSceneResource),
backgrounds: compressedResources.backgrounds.map(
decompressBackgroundResource,
),
tilesets: compressedResources.tilesets.map(decompressTilesetResource),
};
};
export const compressSceneResource = (
scene: SceneResource,
): CompressedSceneResourceWithChildren => {
const tilemap = scene.tilemap
? pruneTilemapLayersTilesets(scene.tilemap)
: undefined;
return {
...scene,
collisions: compress8bitNumberArray(scene.collisions),
tilemap: tilemap
? {
...tilemap,
tileColors: tilemap.tileColors
? compress8bitNumberArray(tilemap.tileColors)
: undefined,
layers: tilemap.layers.map((layer) => ({
...layer,
tiles: compressNumberArray(layer.tiles),
autotiles: layer.autotiles
? compressNumberArray(layer.autotiles)
: undefined,
})),
}
: undefined,
};
};
export const compressBackgroundResource = (
background: BackgroundResource,
): CompressedBackgroundResource => {
return {
...background,
tileColors: compress8bitNumberArray(background.tileColors),
};
};
export const compressTilesetResource = (
tileset: TilesetResource,
): CompressedTilesetResource => ({
...tileset,
tileColors: compressNumberArray(tileset.tileColors),
tileCollisions: compressNumberArray(tileset.tileCollisions),
});
export const compressProjectResources = (
resources: ProjectResources,
): CompressedProjectResources => {
return {
...resources,
scenes: resources.scenes.map(compressSceneResource),
backgrounds: resources.backgrounds.map(compressBackgroundResource),
tilesets: resources.tilesets.map(compressTilesetResource),
};
};
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