9927b97e
 “wangming”
Improve GP_R3 pri...
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import type { MonochromeImageData, PrintImageOptions, PrinterDriver, RawImageDataSource } from './types/printer'
const DEFAULT_IMAGE_THRESHOLD = 180
function yieldToUi (): Promise<void> {
return new Promise((resolve) => {
setTimeout(resolve, 0)
})
}
function ensureMultipleOf8 (value: number, maxValue?: number): number {
const safeMax = maxValue && maxValue > 0 ? Math.max(8, Math.floor(maxValue)) : 0
let width = Math.max(8, Math.round(value || 0))
if (safeMax && width > safeMax) width = safeMax
if (width % 8 !== 0) {
width += 8 - (width % 8)
if (safeMax && width > safeMax) {
width = safeMax - (safeMax % 8)
if (width <= 0) width = 8
}
}
return width
}
function normalizeBase64Payload (source: string): string {
const value = String(source || '').trim()
if (!value) return ''
if (value.startsWith('data:image/')) {
const index = value.indexOf(',')
return index >= 0 ? value.slice(index + 1) : ''
}
if (/^[A-Za-z0-9+/=\r\n]+$/.test(value) && value.length > 128) {
return value.replace(/\s+/g, '')
}
return ''
}
function resolveLocalImagePath (source: string): string {
let path = String(source || '').trim()
if (!path) return ''
if (path.startsWith('file://')) {
path = path.replace(/^file:\/\//, '')
}
// #ifdef APP-PLUS
try {
const converted = plus.io.convertLocalFileSystemURL(path)
if (converted) path = converted
} catch (_) {}
// #endif
try {
path = decodeURIComponent(path)
} catch (_) {}
return path
}
function getDefaultMaxWidthDots (driver: PrinterDriver): number {
if (driver.imageMaxWidthDots && driver.imageMaxWidthDots > 0) return driver.imageMaxWidthDots
return driver.protocol === 'esc' ? 384 : 800
}
export function rasterizeImageData (
source: RawImageDataSource,
options: PrintImageOptions = {}
): MonochromeImageData {
const sourceWidth = Math.max(1, Math.round(source.width || 0))
const sourceHeight = Math.max(1, Math.round(source.height || 0))
const targetWidth = ensureMultipleOf8(sourceWidth)
const threshold = options.threshold != null ? Number(options.threshold) : DEFAULT_IMAGE_THRESHOLD
const pixels: number[] = new Array(targetWidth * sourceHeight).fill(0)
for (let y = 0; y < sourceHeight; y++) {
for (let x = 0; x < sourceWidth; x++) {
const index = (y * sourceWidth + x) * 4
const alpha = Number(source.data[index + 3] ?? 255)
const red = Number(source.data[index] ?? 255)
const green = Number(source.data[index + 1] ?? 255)
const blue = Number(source.data[index + 2] ?? 255)
const gray = red * 0.299 + green * 0.587 + blue * 0.114
pixels[y * targetWidth + x] = alpha <= 10 || gray > threshold ? 0 : 1
}
}
return {
width: targetWidth,
height: sourceHeight,
pixels,
}
}
export async function rasterizeImageForPrinter (
source: string,
driver: PrinterDriver,
options: PrintImageOptions = {}
): Promise<MonochromeImageData> {
// #ifdef APP-PLUS
const rawSource = String(source || '').trim()
if (!rawSource) {
throw new Error('IMAGE_SOURCE_EMPTY')
}
const BitmapFactory = plus.android.importClass('android.graphics.BitmapFactory')
const Bitmap = plus.android.importClass('android.graphics.Bitmap')
const Base64 = plus.android.importClass('android.util.Base64')
const base64Payload = normalizeBase64Payload(rawSource)
let sourceBitmap: any = null
if (base64Payload) {
const bytes = Base64.decode(base64Payload, 0)
sourceBitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length)
} else {
const localPath = resolveLocalImagePath(rawSource)
sourceBitmap = BitmapFactory.decodeFile(localPath)
}
if (!sourceBitmap) {
throw new Error('IMAGE_DECODE_FAILED')
}
const sourceWidth = Number(sourceBitmap.getWidth ? sourceBitmap.getWidth() : 0)
const sourceHeight = Number(sourceBitmap.getHeight ? sourceBitmap.getHeight() : 0)
if (!sourceWidth || !sourceHeight) {
try {
sourceBitmap.recycle && sourceBitmap.recycle()
} catch (_) {}
throw new Error('IMAGE_SIZE_INVALID')
}
const protocolMaxWidth = getDefaultMaxWidthDots(driver)
const maxWidthDots = options.maxWidthDots && options.maxWidthDots > 0 ? options.maxWidthDots : protocolMaxWidth
const targetWidth = ensureMultipleOf8(options.targetWidthDots || sourceWidth, maxWidthDots)
const aspectRatio = sourceHeight / sourceWidth
const targetHeight = Math.max(
1,
Math.round(options.targetHeightDots || (targetWidth * aspectRatio))
)
const threshold = options.threshold != null ? Number(options.threshold) : DEFAULT_IMAGE_THRESHOLD
const scaledBitmap = Bitmap.createScaledBitmap(sourceBitmap, targetWidth, targetHeight, true)
const rasterPixels: number[] = new Array(targetWidth * targetHeight)
for (let y = 0; y < targetHeight; y++) {
if (y > 0 && y % 16 === 0) {
await yieldToUi()
}
for (let x = 0; x < targetWidth; x++) {
const color = Number(scaledBitmap.getPixel(x, y))
const alpha = (color >>> 24) & 0xff
const red = (color >>> 16) & 0xff
const green = (color >>> 8) & 0xff
const blue = color & 0xff
const gray = red * 0.299 + green * 0.587 + blue * 0.114
rasterPixels[y * targetWidth + x] = alpha <= 10 || gray > threshold ? 0 : 1
}
}
try {
if (scaledBitmap !== sourceBitmap && sourceBitmap?.recycle) sourceBitmap.recycle()
} catch (_) {}
try {
scaledBitmap?.recycle && scaledBitmap.recycle()
} catch (_) {}
return {
width: targetWidth,
height: targetHeight,
pixels: rasterPixels,
}
// #endif
// #ifndef APP-PLUS
throw new Error('IMAGE_PRINT_APP_ONLY')
// #endif
}
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