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Spritesheet player for sequencer database viewer
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Original file line number | Diff line number | Diff line change |
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import SequencerFileCache from "../../modules/sequencer-file-cache"; | ||
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const viewSize = 320; | ||
let animatedSprite; | ||
let offscreenApp; | ||
let canvas; | ||
let offscreenCanvas; | ||
let oldImageSrcs = new Map(); | ||
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function initOffscreenApp(databaseStore) { | ||
if (offscreenApp) { | ||
return; | ||
} | ||
canvas = document.createElement("canvas"); | ||
canvas.style.display = "none"; | ||
offscreenCanvas = canvas.transferControlToOffscreen(); | ||
const backgroundColor = | ||
offscreenApp = new PIXI.Application({ autoStart: false, view: offscreenCanvas, backgroundColor: 0x999999, sharedTicker: false }); | ||
offscreenApp.ticker.stop(); | ||
// worker thread would be nice, but then we would need the webworker version of pixi.js too... | ||
document.body.appendChild(canvas); | ||
// workaround to fix errors when destroying the offscreen app | ||
offscreenCanvas.style = {} | ||
offscreenCanvas.width = viewSize; | ||
offscreenCanvas.height = viewSize; | ||
} | ||
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export async function playSpritesheet(file, databaseStore) { | ||
initOffscreenApp(databaseStore); | ||
const sheet = await SequencerFileCache.loadFile(file); | ||
if (!sheet) { | ||
return; | ||
} | ||
SequencerFileCache.registerSpritesheet(file, sheet); | ||
const frames = Object.values(sheet.animations)?.[0]; | ||
if (!frames) { | ||
return; | ||
} | ||
const framerate = sheet.data?.meta?.framerate ?? 30; | ||
const frametime = (1 / framerate) * 1000; | ||
databaseStore.metadata.set({ | ||
type: "Spritesheet", | ||
duration: Math.round(frametime * frames.length) + "ms", | ||
}); | ||
if (!animatedSprite) { | ||
animatedSprite = new PIXI.AnimatedSprite(frames, true); | ||
animatedSprite.anchor.set(0.5); | ||
animatedSprite.x = viewSize / 2; | ||
animatedSprite.y = viewSize / 2; | ||
offscreenApp.stage.addChild(animatedSprite); | ||
} | ||
let queuedFrame; | ||
let renderedFrame; | ||
animatedSprite.onFrameChange = async (frame) => { | ||
// rendering operation is async. If we're currently still rendering | ||
// the previous frame, don't even try to render the current one | ||
if (queuedFrame !== renderedFrame) { | ||
return; | ||
} | ||
let curerntImageSrc = oldImageSrcs.get(frame); | ||
if (!curerntImageSrc) { | ||
queuedFrame = frame; | ||
offscreenApp.render() | ||
const imageBlob = await offscreenCanvas.convertToBlob(); | ||
curerntImageSrc = URL.createObjectURL(imageBlob); | ||
oldImageSrcs.set(frame, curerntImageSrc); | ||
renderedFrame = frame; | ||
} | ||
databaseStore.elements.image.src = curerntImageSrc; | ||
}; | ||
animatedSprite.textures = frames; | ||
animatedSprite.scale.set(viewSize / Math.max(frames[0].width, frames[0].height)); | ||
animatedSprite.file = file; | ||
animatedSprite.play(); | ||
} | ||
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export async function cleanupSpritesheet(destroy = false) { | ||
if (!animatedSprite) { | ||
return; | ||
} | ||
animatedSprite.stop(); | ||
animatedSprite.onFrameChange = null; | ||
if (animatedSprite.file) { | ||
await SequencerFileCache.unloadSpritesheet(animatedSprite.file); | ||
animatedSprite.file = null; | ||
} | ||
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oldImageSrcs.values().forEach((objectUrl) => { | ||
URL.revokeObjectURL(objectUrl); | ||
}); | ||
oldImageSrcs.clear(); | ||
if (destroy) { | ||
animatedSprite.destroy(); | ||
animatedSprite = null; | ||
offscreenApp.destroy(); | ||
canvas.remove() | ||
offscreenCanvas = null; | ||
offscreenApp = undefined; | ||
} | ||
} |
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