import { Texture, BaseTexture, utils, Rectangle } from '@pixi/core';
import type { ImageResource, IPointData } from '@pixi/core';
/** Represents the JSON data for a spritesheet atlas. */
export interface ISpritesheetFrameData
{
frame: {
x: number;
y: number;
w: number;
h: number;
};
trimmed?: boolean;
rotated?: boolean;
sourceSize?: {
w: number;
h: number;
};
spriteSourceSize?: {
x: number;
y: number;
};
anchor?: IPointData;
}
/** Atlas format. */
export interface ISpritesheetData
{
frames: utils.Dict<ISpritesheetFrameData>;
animations?: utils.Dict<string[]>;
meta: {
scale: string;
// eslint-disable-next-line camelcase
related_multi_packs?: string[];
};
}
/**
* Utility class for maintaining reference to a collection
* of Textures on a single Spritesheet.
*
* To access a sprite sheet from your code you may pass its JSON data file to Pixi's loader:
*
* ```js
* PIXI.Loader.shared.add("images/spritesheet.json").load(setup);
*
* function setup() {
* let sheet = PIXI.Loader.shared.resources["images/spritesheet.json"].spritesheet;
* ...
* }
* ```
*
* Alternately, you may circumvent the loader by instantiating the Spritesheet directly:
* ```js
* const sheet = new PIXI.Spritesheet(texture, spritesheetData);
* await sheet.parse();
* console.log('Spritesheet ready to use!');
* ```
*
* With the `sheet.textures` you can create Sprite objects,`sheet.animations` can be used to create an AnimatedSprite.
*
* Sprite sheets can be packed using tools like TexturePacker,
* Shoebox or Spritesheet.js.
* Default anchor points (see PIXI.Texture#defaultAnchor) and grouping of animation sprites are currently only
* supported by TexturePacker.
* @memberof PIXI
*/
export class Spritesheet
{
/** The maximum number of Textures to build per process. */
static readonly BATCH_SIZE = 1000;
/** For multi-packed spritesheets, this contains a reference to all the other spritesheets it depends on. */
public linkedSheets: Spritesheet[] = [];
/** Reference to ths source texture. */
public baseTexture: BaseTexture;
/**
* A map containing all textures of the sprite sheet.
* Can be used to create a Sprite:
* ```js
* new PIXI.Sprite(sheet.textures["image.png"]);
* ```
*/
public textures: utils.Dict<Texture>;
/**
* A map containing the textures for each animation.
* Can be used to create an AnimatedSprite:
* ```js
* new PIXI.AnimatedSprite(sheet.animations["anim_name"])
* ```
*/
public animations: utils.Dict<Texture[]>;
/**
* Reference to the original JSON data.
* @type {object}
*/
public data: ISpritesheetData;
/** The resolution of the spritesheet. */
public resolution: number;
/**
* Reference to original source image from the Loader. This reference is retained so we
* can destroy the Texture later on. It is never used internally.
*/
private _texture: Texture;
/**
* Map of spritesheet frames.
* @type {object}
*/
private _frames: utils.Dict<ISpritesheetFrameData>;
/** Collection of frame names. */
private _frameKeys: string[];
/** Current batch index being processed. */
private _batchIndex: number;
/**
* Callback when parse is completed.
* @type {Function}
*/
private _callback: (textures: utils.Dict<Texture>) => void;
/**
* @param texture - Reference to the source BaseTexture object.
* @param {object} data - Spritesheet image data.
* @param resolutionFilename - The filename to consider when determining
* the resolution of the spritesheet. If not provided, the imageUrl will
* be used on the BaseTexture.
*/
constructor(texture: BaseTexture | Texture, data: ISpritesheetData, resolutionFilename: string = null)
{
this._texture = texture instanceof Texture ? texture : null;
this.baseTexture = texture instanceof BaseTexture ? texture : this._texture.baseTexture;
this.textures = {};
this.animations = {};
this.data = data;
const resource = this.baseTexture.resource as ImageResource;
this.resolution = this._updateResolution(resolutionFilename || (resource ? resource.url : null));
this._frames = this.data.frames;
this._frameKeys = Object.keys(this._frames);
this._batchIndex = 0;
this._callback = null;
}
/**
* Generate the resolution from the filename or fallback
* to the meta.scale field of the JSON data.
* @param resolutionFilename - The filename to use for resolving
* the default resolution.
* @returns Resolution to use for spritesheet.
*/
private _updateResolution(resolutionFilename: string = null): number
{
const { scale } = this.data.meta;
// Use a defaultValue of `null` to check if a url-based resolution is set
let resolution = utils.getResolutionOfUrl(resolutionFilename, null);
// No resolution found via URL
if (resolution === null)
{
// Use the scale value or default to 1
resolution = parseFloat(scale ?? '1');
}
// For non-1 resolutions, update baseTexture
if (resolution !== 1)
{
this.baseTexture.setResolution(resolution);
}
return resolution;
}
/**
* Parser spritesheet from loaded data. This is done asynchronously
* to prevent creating too many Texture within a single process.
* @method PIXI.Spritesheet#parse
*/
public parse(): Promise<utils.Dict<Texture>>
{
return new Promise((resolve) =>
{
this._callback = resolve;
this._batchIndex = 0;
if (this._frameKeys.length <= Spritesheet.BATCH_SIZE)
{
this._processFrames(0);
this._processAnimations();
this._parseComplete();
}
else
{
this._nextBatch();
}
});
}
/**
* Process a batch of frames
* @param initialFrameIndex - The index of frame to start.
*/
private _processFrames(initialFrameIndex: number): void
{
let frameIndex = initialFrameIndex;
const maxFrames = Spritesheet.BATCH_SIZE;
while (frameIndex - initialFrameIndex < maxFrames && frameIndex < this._frameKeys.length)
{
const i = this._frameKeys[frameIndex];
const data = this._frames[i];
const rect = data.frame;
if (rect)
{
let frame = null;
let trim = null;
const sourceSize = data.trimmed !== false && data.sourceSize
? data.sourceSize : data.frame;
const orig = new Rectangle(
0,
0,
Math.floor(sourceSize.w) / this.resolution,
Math.floor(sourceSize.h) / this.resolution
);
if (data.rotated)
{
frame = new Rectangle(
Math.floor(rect.x) / this.resolution,
Math.floor(rect.y) / this.resolution,
Math.floor(rect.h) / this.resolution,
Math.floor(rect.w) / this.resolution
);
}
else
{
frame = new Rectangle(
Math.floor(rect.x) / this.resolution,
Math.floor(rect.y) / this.resolution,
Math.floor(rect.w) / this.resolution,
Math.floor(rect.h) / this.resolution
);
}
// Check to see if the sprite is trimmed
if (data.trimmed !== false && data.spriteSourceSize)
{
trim = new Rectangle(
Math.floor(data.spriteSourceSize.x) / this.resolution,
Math.floor(data.spriteSourceSize.y) / this.resolution,
Math.floor(rect.w) / this.resolution,
Math.floor(rect.h) / this.resolution
);
}
this.textures[i] = new Texture(
this.baseTexture,
frame,
orig,
trim,
data.rotated ? 2 : 0,
data.anchor
);
// lets also add the frame to pixi's global cache for 'from' and 'fromLoader' functions
Texture.addToCache(this.textures[i], i);
}
frameIndex++;
}
}
/** Parse animations config. */
private _processAnimations(): void
{
const animations = this.data.animations || {};
for (const animName in animations)
{
this.animations[animName] = [];
for (let i = 0; i < animations[animName].length; i++)
{
const frameName = animations[animName][i];
this.animations[animName].push(this.textures[frameName]);
}
}
}
/** The parse has completed. */
private _parseComplete(): void
{
const callback = this._callback;
this._callback = null;
this._batchIndex = 0;
callback.call(this, this.textures);
}
/** Begin the next batch of textures. */
private _nextBatch(): void
{
this._processFrames(this._batchIndex * Spritesheet.BATCH_SIZE);
this._batchIndex++;
setTimeout(() =>
{
if (this._batchIndex * Spritesheet.BATCH_SIZE < this._frameKeys.length)
{
this._nextBatch();
}
else
{
this._processAnimations();
this._parseComplete();
}
}, 0);
}
/**
* Destroy Spritesheet and don't use after this.
* @param {boolean} [destroyBase=false] - Whether to destroy the base texture as well
*/
public destroy(destroyBase = false): void
{
for (const i in this.textures)
{
this.textures[i].destroy();
}
this._frames = null;
this._frameKeys = null;
this.data = null;
this.textures = null;
if (destroyBase)
{
this._texture?.destroy();
this.baseTexture.destroy();
}
this._texture = null;
this.baseTexture = null;
this.linkedSheets = [];
}
}