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{ type Disposable, ResourceTracker } from \"../disposable.js\";\r\nimport {\r\n type LasciiErrorContext,\r\n type LasciiErrorType,\r\n logLasciiError,\r\n toError,\r\n} from \"../errors.js\";\r\nimport { LasciiEmitter } from \"../events.js\";\r\nimport { prefersReducedMotion } from \"../a11y.js\";\r\n\r\nexport type {\r\n LasciiCompleteDetail,\r\n LasciiErrorDetail,\r\n LasciiProgressDetail,\r\n LasciiStartDetail,\r\n} from \"../events.js\";\r\nexport { LasciiEvent } from \"../events.js\";\r\n\r\nexport interface LasciiImageEffectOptions {\r\n ASCII_CHARS?: string;\r\n FONT_SIZE?: number;\r\n ASPECT_WIDTH?: number;\r\n ASPECT_HEIGHT?: number;\r\n ASCII_COLUMNS?: number;\r\n MAX_ASCII_COLUMNS?: number;\r\n TARGET_CELL_CSS_PX?: number;\r\n IMAGE_STAGGER_MS?: number;\r\n CELL_APPEAR_MS?: number;\r\n SCRAMBLE_COUNT?: number;\r\n SCRAMBLE_SPEED_MS?: number;\r\n REVEAL_DELAY_MS?: number;\r\n BACKGROUND_COLOR?: string;\r\n TEXT_COLOR?: string;\r\n reducedMotion?: boolean;\r\n}\r\n\r\nexport interface LasciiImageEffectDefaults\r\n extends Required> {}\r\n\r\nclass LasciiImageEffect extends LasciiEmitter implements Disposable {\r\n static DEFAULTS: LasciiImageEffectDefaults = {\r\n ASCII_CHARS: \" . . . . . . :::=+xX#0369\",\r\n FONT_SIZE: 40,\r\n ASPECT_WIDTH: 4,\r\n ASPECT_HEIGHT: 5,\r\n ASCII_COLUMNS: 25,\r\n MAX_ASCII_COLUMNS: 96,\r\n TARGET_CELL_CSS_PX: 9,\r\n IMAGE_STAGGER_MS: 100,\r\n CELL_APPEAR_MS: 0.5,\r\n SCRAMBLE_COUNT: 10,\r\n SCRAMBLE_SPEED_MS: 50,\r\n REVEAL_DELAY_MS: 0,\r\n BACKGROUND_COLOR: \"transparent\",\r\n TEXT_COLOR: \"#c8c8c8\",\r\n };\r\n\r\n img: HTMLImageElement;\r\n index: number;\r\n config: LasciiImageEffectDefaults;\r\n _minAsciiColumns: number;\r\n canvas: HTMLCanvasElement;\r\n ctx: CanvasRenderingContext2D | null;\r\n staggerDelay: number;\r\n failed: boolean;\r\n charWidth!: number;\r\n charHeight!: number;\r\n ASCII_ROWS!: number;\r\n denseCharIndex!: number;\r\n denseChars!: string[];\r\n samplingImg!: HTMLImageElement;\r\n private readonly tracker = new ResourceTracker();\r\n private readonly activeTimeouts: Array> = [];\r\n private scrambleTicker: ReturnType | null = null;\r\n private revealScheduled = false;\r\n private readonly reduceMotion: boolean;\r\n\r\n constructor(\r\n img: HTMLImageElement,\r\n index = 0,\r\n options: LasciiImageEffectOptions = {},\r\n ) {\r\n super();\r\n this.img = img;\r\n this.index = index;\r\n this.config = { ...LasciiImageEffect.DEFAULTS, ...options };\r\n this._minAsciiColumns = this.config.ASCII_COLUMNS;\r\n this.canvas = document.createElement(\"canvas\");\r\n this.canvas.setAttribute(\"aria-hidden\", \"true\");\r\n this.ctx = null;\r\n this.reduceMotion = prefersReducedMotion(options.reducedMotion);\r\n this.staggerDelay = this.index * this.config.IMAGE_STAGGER_MS;\r\n this.failed = false;\r\n\r\n this.tracker.track(() => {\r\n this.clearTimers();\r\n this.canvas.remove();\r\n this.clearSamplingImage();\r\n this.img.removeAttribute(\"aria-busy\");\r\n });\r\n\r\n if (this.reduceMotion) {\r\n this.img.style.opacity = \"1\";\r\n queueMicrotask(() => this.finishWithoutAnimation());\r\n return;\r\n }\r\n\r\n this.img.style.opacity = \"0\";\r\n this.img.setAttribute(\"aria-busy\", \"true\");\r\n this.ctx = this.canvas.getContext(\"2d\");\r\n\r\n if (!this.ctx) {\r\n queueMicrotask(() => {\r\n if (this.tracker.isDisposed) return;\r\n this.handleError(\r\n \"canvas_context_unavailable\",\r\n new Error(\"Unable to acquire 2d rendering context\"),\r\n );\r\n });\r\n return;\r\n }\r\n\r\n this.load();\r\n }\r\n\r\n get disposed(): boolean {\r\n return this.tracker.isDisposed;\r\n }\r\n\r\n dispose(): void {\r\n if (this.tracker.isDisposed) return;\r\n this.failed = true;\r\n this.tracker.dispose();\r\n this.img.style.opacity = \"1\";\r\n }\r\n\r\n private ensureNotDisposed(): void {\r\n if (this.tracker.isDisposed) {\r\n throw new Error(\"LasciiImageEffect has been disposed\");\r\n }\r\n }\r\n\r\n private clearSamplingImage(): void {\r\n if (!this.samplingImg) return;\r\n this.samplingImg.onload = null;\r\n this.samplingImg.onerror = null;\r\n this.samplingImg.src = \"\";\r\n }\r\n\r\n private clearTimers(): void {\r\n for (const id of this.activeTimeouts) {\r\n clearTimeout(id);\r\n }\r\n this.activeTimeouts.length = 0;\r\n if (this.scrambleTicker !== null) {\r\n clearInterval(this.scrambleTicker);\r\n this.scrambleTicker = null;\r\n }\r\n }\r\n\r\n private trackTimeout(\r\n handler: () => void,\r\n delay: number,\r\n ): ReturnType {\r\n const id = setTimeout(() => {\r\n const index = this.activeTimeouts.indexOf(id);\r\n if (index >= 0) this.activeTimeouts.splice(index, 1);\r\n handler();\r\n }, delay);\r\n this.activeTimeouts.push(id);\r\n return id;\r\n }\r\n\r\n private trackAnimationFrame(handler: FrameRequestCallback): number {\r\n const id = requestAnimationFrame((time) => {\r\n handler(time);\r\n });\r\n this.tracker.track(() => cancelAnimationFrame(id));\r\n return id;\r\n }\r\n\r\n private handleError(\r\n type: LasciiErrorType | string,\r\n error: unknown,\r\n context: LasciiErrorContext = {},\r\n ): void {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.failed = true;\r\n const err = toError(error);\r\n logLasciiError(type, err, {\r\n element: this.img,\r\n config: this.config,\r\n ...context,\r\n });\r\n this.clearTimers();\r\n this.cleanup();\r\n this.fallbackToOriginal();\r\n this.img.removeAttribute(\"aria-busy\");\r\n this.emit(\"error\", { error: err });\r\n }\r\n\r\n private cleanup(): void {\r\n this.canvas.remove();\r\n this.clearSamplingImage();\r\n }\r\n\r\n private fallbackToOriginal(): void {\r\n this.img.style.opacity = \"1\";\r\n }\r\n\r\n applyDisplayScaledColumns(): void {\r\n const rect = this.img.getBoundingClientRect();\r\n const width = rect.width;\r\n if (width < 8) return;\r\n const target = this.config.TARGET_CELL_CSS_PX;\r\n const maxCols = this.config.MAX_ASCII_COLUMNS;\r\n const cols = Math.min(\r\n maxCols,\r\n Math.max(this._minAsciiColumns, Math.round(width / target)),\r\n );\r\n this.config.ASCII_COLUMNS = cols;\r\n }\r\n\r\n measureCharacters(): void {\r\n const measureCtx = document.createElement(\"canvas\").getContext(\"2d\");\r\n if (!measureCtx) {\r\n throw new Error(\"Unable to acquire 2d context for character measurement\");\r\n }\r\n measureCtx.font = `${this.config.FONT_SIZE}px monospace`;\r\n this.charWidth = Math.ceil(measureCtx.measureText(\"M\").width);\r\n this.charHeight = this.config.FONT_SIZE;\r\n this.ASCII_ROWS = Math.round(\r\n this.config.ASCII_COLUMNS *\r\n (this.config.ASPECT_HEIGHT / this.config.ASPECT_WIDTH) *\r\n (this.charWidth / this.charHeight),\r\n );\r\n this.denseCharIndex = this.config.ASCII_CHARS.lastIndexOf(\".\");\r\n this.denseChars = this.config.ASCII_CHARS.slice(\r\n this.denseCharIndex + 1,\r\n ).split(\"\");\r\n }\r\n\r\n prepareCanvas(): void {\r\n if (!this.ctx) {\r\n throw new Error(\"Canvas 2d context is not available\");\r\n }\r\n this.canvas.width = this.config.ASCII_COLUMNS * this.charWidth;\r\n this.canvas.height = this.ASCII_ROWS * this.charHeight;\r\n this.ctx.font = `${this.charHeight}px monospace`;\r\n this.ctx.textBaseline = \"top\";\r\n }\r\n\r\n attachCanvas(): void {\r\n const wrapper = this.img.parentElement;\r\n if (wrapper) {\r\n this.img.style.opacity = \"0\";\r\n this.canvas.style.position = \"absolute\";\r\n this.canvas.style.top = \"0\";\r\n this.canvas.style.left = \"0\";\r\n this.canvas.style.width = \"100%\";\r\n this.canvas.style.height = \"100%\";\r\n this.canvas.style.objectFit = \"cover\";\r\n const computedPosition = getComputedStyle(wrapper).position;\r\n if (computedPosition === \"static\") {\r\n wrapper.style.position = \"relative\";\r\n }\r\n if (!this.canvas.isConnected) {\r\n wrapper.appendChild(this.canvas);\r\n }\r\n }\r\n }\r\n\r\n load(): void {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n\r\n this.samplingImg = new Image();\r\n this.samplingImg.crossOrigin = \"anonymous\";\r\n this.samplingImg.onload = () => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.trackAnimationFrame(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.trackAnimationFrame(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n try {\r\n this.applyDisplayScaledColumns();\r\n this.measureCharacters();\r\n this.prepareCanvas();\r\n this.attachCanvas();\r\n this.start();\r\n } catch (error) {\r\n this.handleError(\"canvas_initialization_failed\", error);\r\n }\r\n });\r\n });\r\n };\r\n this.samplingImg.onerror = () => {\r\n this.handleError(\r\n \"image_load_failed\",\r\n new Error(\"Failed to load sampling image\"),\r\n { src: this.img.src },\r\n );\r\n };\r\n this.samplingImg.src = this.img.src;\r\n }\r\n\r\n start(): void {\r\n this.ensureNotDisposed();\r\n if (this.failed || !this.ctx) return;\r\n try {\r\n this.img.setAttribute(\"aria-busy\", \"true\");\r\n this.emit(\"start\", { text: this.label() });\r\n this.emit(\"progress\", { progress: 0 });\r\n const { asciiGrid, brightnessGrid } = this.imageToAsciiGrid();\r\n this.animateCells(asciiGrid, brightnessGrid);\r\n } catch (error) {\r\n this.handleError(\"image_animation_failed\", error);\r\n }\r\n }\r\n\r\n imageToAsciiGrid(): {\r\n asciiGrid: string[][];\r\n brightnessGrid: number[][];\r\n } {\r\n const img = this.samplingImg;\r\n const imageAspect = img.naturalWidth / img.naturalHeight;\r\n const itemAspect = this.config.ASPECT_WIDTH / this.config.ASPECT_HEIGHT;\r\n let cropX = 0;\r\n let cropY = 0;\r\n let cropW = img.naturalWidth;\r\n let cropH = img.naturalHeight;\r\n\r\n if (imageAspect > itemAspect) {\r\n cropW = img.naturalHeight * itemAspect;\r\n cropX = (img.naturalWidth - cropW) / 2;\r\n } else {\r\n cropH = img.naturalWidth / itemAspect;\r\n cropY = (img.naturalHeight - cropH) / 2;\r\n }\r\n\r\n const samplingCanvas = document.createElement(\"canvas\");\r\n const samplingCtx = samplingCanvas.getContext(\"2d\");\r\n if (!samplingCtx) {\r\n throw new Error(\"Unable to acquire 2d context for image sampling\");\r\n }\r\n samplingCanvas.width = this.config.ASCII_COLUMNS;\r\n samplingCanvas.height = this.ASCII_ROWS;\r\n samplingCtx.drawImage(\r\n img,\r\n cropX,\r\n cropY,\r\n cropW,\r\n cropH,\r\n 0,\r\n 0,\r\n this.config.ASCII_COLUMNS,\r\n this.ASCII_ROWS,\r\n );\r\n\r\n const { data } = samplingCtx.getImageData(\r\n 0,\r\n 0,\r\n this.config.ASCII_COLUMNS,\r\n this.ASCII_ROWS,\r\n );\r\n const asciiGrid: string[][] = [];\r\n const brightnessGrid: number[][] = [];\r\n\r\n for (let row = 0; row < this.ASCII_ROWS; row++) {\r\n const asciiRow: string[] = [];\r\n const brightnessRow: number[] = [];\r\n for (let col = 0; col < this.config.ASCII_COLUMNS; col++) {\r\n const pixelIndex = (row * this.config.ASCII_COLUMNS + col) * 4;\r\n const brightness =\r\n (data[pixelIndex] * 0.299 +\r\n data[pixelIndex + 1] * 0.587 +\r\n data[pixelIndex + 2] * 0.114) /\r\n 255;\r\n const charIndex = Math.min(\r\n this.config.ASCII_CHARS.length - 1,\r\n Math.floor((1 - brightness) * this.config.ASCII_CHARS.length),\r\n );\r\n asciiRow.push(this.config.ASCII_CHARS[charIndex]);\r\n brightnessRow.push(charIndex);\r\n }\r\n asciiGrid.push(asciiRow);\r\n brightnessGrid.push(brightnessRow);\r\n }\r\n\r\n return { asciiGrid, brightnessGrid };\r\n }\r\n\r\n animateCells(\r\n asciiGrid: string[][],\r\n brightnessGrid: number[][],\r\n ): void {\r\n const totalCells = this.config.ASCII_COLUMNS * this.ASCII_ROWS;\r\n const scrambleState: (number | null)[] = new Array(totalCells).fill(null);\r\n let settledCount = 0;\r\n\r\n const cellOrder = this.shuffleArray(\r\n Array.from({ length: totalCells }, (_, i) => i),\r\n );\r\n\r\n const failAnimation = (error: unknown): void => {\r\n this.clearTimers();\r\n this.handleError(\"image_animation_failed\", toError(error));\r\n };\r\n\r\n this.scrambleTicker = setInterval(() => {\r\n if (this.failed || this.tracker.isDisposed) {\r\n this.clearTimers();\r\n return;\r\n }\r\n try {\r\n let stillScrambling = false;\r\n for (let cellIndex = 0; cellIndex < totalCells; cellIndex++) {\r\n const remaining = scrambleState[cellIndex];\r\n if (remaining === null || remaining <= 0) continue;\r\n stillScrambling = true;\r\n const row = Math.floor(cellIndex / this.config.ASCII_COLUMNS);\r\n const col = cellIndex % this.config.ASCII_COLUMNS;\r\n\r\n if (remaining === 1) {\r\n this.drawCharacter(col, row, asciiGrid[row][col]);\r\n scrambleState[cellIndex] = 0;\r\n settledCount++;\r\n this.emit(\"progress\", { progress: settledCount / totalCells });\r\n if (settledCount === totalCells) this.revealImage();\r\n } else {\r\n this.drawCharacter(col, row, this.randomDenseCharacter());\r\n scrambleState[cellIndex] = remaining - 1;\r\n }\r\n }\r\n if (!stillScrambling && settledCount === totalCells) {\r\n if (this.scrambleTicker !== null) {\r\n clearInterval(this.scrambleTicker);\r\n this.scrambleTicker = null;\r\n }\r\n }\r\n } catch (error) {\r\n failAnimation(error);\r\n }\r\n }, this.config.SCRAMBLE_SPEED_MS);\r\n\r\n cellOrder.forEach((cellIndex, i) => {\r\n this.trackTimeout(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n try {\r\n const row = Math.floor(cellIndex / this.config.ASCII_COLUMNS);\r\n const col = cellIndex % this.config.ASCII_COLUMNS;\r\n const isDark = brightnessGrid[row][col] > this.denseCharIndex;\r\n\r\n if (!isDark) {\r\n this.drawCharacter(col, row, asciiGrid[row][col]);\r\n scrambleState[cellIndex] = 0;\r\n settledCount++;\r\n this.emit(\"progress\", { progress: settledCount / totalCells });\r\n if (settledCount === totalCells) this.revealImage();\r\n } else {\r\n scrambleState[cellIndex] = this.config.SCRAMBLE_COUNT;\r\n }\r\n } catch (error) {\r\n failAnimation(error);\r\n }\r\n }, this.staggerDelay + i * this.config.CELL_APPEAR_MS);\r\n });\r\n }\r\n\r\n drawCharacter(col: number, row: number, char: string): void {\r\n if (!this.ctx) {\r\n throw new Error(\"Canvas 2d context is not available\");\r\n }\r\n this.ctx.fillStyle = this.config.BACKGROUND_COLOR;\r\n this.ctx.fillRect(\r\n col * this.charWidth,\r\n row * this.charHeight,\r\n this.charWidth,\r\n this.charHeight,\r\n );\r\n this.ctx.fillStyle = this.config.TEXT_COLOR;\r\n this.ctx.fillText(char, col * this.charWidth, row * this.charHeight);\r\n }\r\n\r\n randomDenseCharacter(): string {\r\n return this.denseChars[Math.floor(Math.random() * this.denseChars.length)];\r\n }\r\n\r\n private label(): string {\r\n return this.img.alt || this.img.src;\r\n }\r\n\r\n private finishWithoutAnimation(): void {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.emit(\"start\", { text: this.label() });\r\n this.emit(\"progress\", { progress: 1 });\r\n this.emit(\"complete\", { text: this.label() });\r\n }\r\n\r\n revealImage(): void {\r\n if (this.failed || this.tracker.isDisposed || this.revealScheduled) return;\r\n this.revealScheduled = true;\r\n this.emit(\"progress\", { progress: 1 });\r\n this.emit(\"complete\", { text: this.label() });\r\n this.img.removeAttribute(\"aria-busy\");\r\n this.trackTimeout(() => {\r\n if (this.failed || this.tracker.isDisposed) return;\r\n this.canvas.style.transition = \"opacity 0.5s ease\";\r\n this.canvas.style.opacity = \"0\";\r\n this.img.style.transition = \"opacity 0.5s ease\";\r\n this.img.style.opacity = \"1\";\r\n this.trackTimeout(() => {\r\n this.canvas.remove();\r\n }, 500);\r\n }, this.config.REVEAL_DELAY_MS);\r\n }\r\n\r\n shuffleArray(array: T[]): T[] {\r\n for (let i = array.length - 1; i > 0; i--) {\r\n const j = Math.floor(Math.random() * (i + 1));\r\n [array[i], array[j]] = [array[j], array[i]];\r\n }\r\n return array;\r\n }\r\n\r\n static init(selector = \"[data-lascii-image]\"): LasciiImageEffect[] {\r\n const images = document.querySelectorAll(selector);\r\n return Array.from(\r\n images,\r\n (img, index) => new LasciiImageEffect(img as HTMLImageElement, index),\r\n );\r\n }\r\n}\r\n\r\nexport default LasciiImageEffect;\r\n"]}