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forked from dyf/APP

恢复7305代码冲突

This commit is contained in:
fengerli
2025-11-17 09:29:05 +08:00
parent b24d34d32d
commit c8ea753b8e

View File

@ -1,6 +1,6 @@
<template>
<view>
<canvas canvas-id="reusableCanvas" :width="currentCanvasWidth" :height="currentCanvasHeight"
<canvas type="2d" canvas-id="reusableCanvas" :width="currentCanvasWidth" :height="currentCanvasHeight"
class="offscreen-canvas"></canvas>
</view>
</template>
@ -27,16 +27,6 @@
color: {
type: String,
default: "#000000"
},
// 二值化阈值0~1越大越细默认偏清晰
threshold: {
type: Number,
default: 0.45
},
// 是否启用轻度笔画修复3x3 膨胀);默认关闭以避免变粗
sharpen: {
type: Boolean,
default: false
}
},
data() {
@ -58,16 +48,6 @@
this.ctx = uni.createCanvasContext('reusableCanvas', this);
},
methods: {
/**
* 外部可调用:复位画布为纯背景并立即提交
*/
async resetCanvas() {
if (!this.ctx) return;
this.clearCanvas();
await new Promise((resolve) => {
this.ctx.draw(true, () => setTimeout(resolve, 30));
});
},
/**
* 估算单行文本所需的Canvas宽度
*/
@ -79,8 +59,6 @@
* 清除Canvas内容
*/
clearCanvas() {
// 先清除,再用背景色填充,确保无残留
this.ctx.clearRect(0, 0, this.currentCanvasWidth, this.currentCanvasHeight);
this.ctx.setFillStyle(this.bgColor);
this.ctx.fillRect(0, 0, this.currentCanvasWidth, this.currentCanvasHeight);
},
@ -89,11 +67,6 @@
* 复用单个Canvas处理所有文本行
*/
async drawAndGetPixels() {
// 发送前:确保画布处于干净背景态
await this.resetCanvas();
// 超采样比例(提高分辨率再降采样,减少模糊)
const SCALE = 3;
const PADDING_X = 1 * SCALE; // 左侧预留像素,避免首字裁剪
let binaryToHex = (binaryArray) => {
if (!Array.isArray(binaryArray) || binaryArray.length !== 8) {
throw new Error("输入必须是包含8个元素的二进制数组");
@ -117,107 +90,25 @@
return hexString;
}
let convertCharToMatrix = (drawResult, item) => {
// 设备端使用13x13点阵渲染保持输出13列×13行但只在内部采样12×12保留右侧与底部1像素缓冲
let convertCharToMatrix = (imageData, item) => {
const charWidth = 13;
const charHeight = 13;
const effectiveWidth = 12; // 仅采样前12列
const effectiveHeight = 12; // 仅采样前12行
const { pixelData, width, height } = drawResult;
// 将高分辨率像素降采样为13x13的布尔矩阵
const target = new Array(charWidth * charHeight).fill(0);
const threshold = Math.max(0.2, Math.min(0.8, this.threshold || 0.45));
// 确保采样区域严格对齐从PADDING_X开始只采样12列右侧预留1px12行底部预留1px
// 字符实际绘制区域从PADDING_X开始宽度为12*SCALE
const charStartX = PADDING_X;
const charEndX = PADDING_X + effectiveWidth * SCALE; // 仅采样到第12列
for (let y = 0; y < charHeight; y++) {
for (let x = 0; x < charWidth; x++) {
// 超出有效采样区域第13列或第13行直接置0作为缓冲
if (x >= effectiveWidth || y >= effectiveHeight) {
target[y * charWidth + x] = 0;
continue;
}
let onCount = 0;
let total = 0;
// 采样区域字符从PADDING_X开始绘制每列宽度为SCALE
const startX = PADDING_X + x * SCALE;
const startY = y * SCALE;
for (let sy = 0; sy < SCALE; sy++) {
for (let sx = 0; sx < SCALE; sx++) {
const px = startX + sx;
const py = startY + sy;
// 边界检查确保不超出Canvas边界且不超出字符实际绘制区域
if (px < 0 || py < 0 || px >= width || py >= height) {
// 边界外视为背景(黑色)
continue;
}
// 额外检查:确保不采样到字符右侧的残留区域
if (px >= charEndX) {
// 超出字符区域,视为背景
continue;
}
const idx = (py * width + px) * 4;
const R = pixelData[idx];
const G = pixelData[idx + 1];
const B = pixelData[idx + 2];
const A = pixelData[idx + 3] || 255;
// 计算亮度
const luminance = 0.299 * R + 0.587 * G + 0.114 * B;
const alpha = A / 255;
// 背景是黑色,文字是白色,所以判断亮色(>=128为文字点
if (luminance >= 128 && alpha > 0.5) onCount++;
total++;
}
}
// 当亮色占比超过阈值时判为1至少需要采样到一些像素
target[y * charWidth + x] = (total > 0 && onCount / total >= threshold) ? 1 : 0;
}
}
// 轻度笔画修复:可选 3x3 膨胀(启用时阈值更严格,避免变粗)
if (this.sharpen) {
const dilated = target.slice();
for (let y = 0; y < effectiveHeight; y++) {
for (let x = 0; x < effectiveWidth; x++) {
const idx = y * charWidth + x;
if (target[idx] === 1) continue;
let neighbors = 0;
for (let dy = -1; dy <= 1; dy++) {
for (let dx = -1; dx <= 1; dx++) {
if (dx === 0 && dy === 0) continue;
const nx = x + dx;
const ny = y + dy;
if (nx < 0 || ny < 0 || nx >= effectiveWidth || ny >= effectiveHeight) continue;
if (target[ny * charWidth + nx] === 1) neighbors++;
}
}
// 使用更严格的邻居门限,避免整体变粗
if (neighbors >= 5) {
dilated[idx] = 1;
}
}
}
for (let i = 0; i < target.length; i++) target[i] = dilated[i];
const charHeight = 12;
const pixels = [];
for (let i = 0; i < imageData.length; i += 4) {
const R = imageData[i];
pixels.push(R < 128 ? 1 : 0);
}
const lowBytes = new Array(charWidth).fill(0);
const highBytes = new Array(charWidth).fill(0);
// 按列打包每列13行分成上下两字节低字节0-7行8行高字节8-12行5行
for (let col = 0; col < charWidth; col++) {
for (let row = 0; row < charHeight; row++) {
const pixel = target[row * charWidth + col];
const pixel = pixels[row * charWidth + col];
if (pixel === 1) {
if (row < 8) {
// 低字节0-7行从低位到高位
lowBytes[col] |= (1 << row);
} else {
// 高字节8-12行从低位到高位使用5位剩余3位未使用
highBytes[col] |= (1 << (row - 8));
}
}
@ -230,32 +121,34 @@
let result = {};
let ctx = this.ctx;
// 1. 动态调整Canvas尺寸(高分辨率)
// 设备端使用13x13点阵渲染
this.currentCanvasWidth = 13 * SCALE + PADDING_X;
this.currentCanvasHeight = 13 * SCALE;
// 1. 动态调整Canvas尺寸
this.currentCanvasWidth = 13;
this.currentCanvasHeight = 12;
// 2. 清空Canvas绘制背景
this.clearCanvas();
// 3. 设置文字样式(整数像素对齐,顶部基线,避免首字裁剪)
// 3. 设置文字样式
ctx.setFillStyle(this.color);
ctx.setTextBaseline('top');
ctx.setTextAlign('left');
const fs = Math.max(1, Math.round(this.fontSize)) * SCALE;
ctx.setFontSize(fs);
ctx.font = `${fs}px "PingFangBold", "PingFang SC", Arial, sans-serif`;
ctx.setTextBaseline('middle');
// ctx.setTextAlign('center')
ctx.setFontSize(this.fontSize);
ctx.font = `${this.fontSize}px "PingFangBold", "PingFang SC", Arial, sans-serif`;
// 4. 绘制单个字符(每个字符独立绘制在固定位置)
// 确保字符始终从PADDING_X开始绘制Y坐标为0保证采样一致性
const charX = PADDING_X;
const charY = 0;
ctx.fillText(textLine, charX, charY);
// 4. 绘制当前行文本
let currentX = 0;
let currentY = this.fontSize / 2 + 1;
for (let j = 0; j < textLine.length; j++) {
let char = textLine[j];
ctx.fillText(char, currentX, currentY);
// 按实际字符宽度计算间距
let charWidth = ctx.measureText(char).width;
currentX += charWidth;
}
// 5. 异步绘制并获取像素数据(串行处理避免冲突)
const grabPixels = () => new Promise((resolve, reject) => {
// 立即绘制并给一点缓冲时间,避免取像素过早
ctx.draw(true, () => {
await new Promise((resolve, reject) => {
ctx.draw(false, () => {
setTimeout(() => {
uni.canvasGetImageData({
canvasId: 'reusableCanvas',
@ -272,23 +165,15 @@
};
resolve();
},
fail: err => reject(err)
fail: err => {
// console.error(`处理第${i+1}行失败:`, err);
reject(err)
}
});
}, 70);
}, 100);
});
});
await grabPixels();
// 一次性校验:若像素全黑或明显异常,重绘重取一次
let nonZero = false;
for (let i = 0; i < result.pixelData.length; i += 4) {
if (result.pixelData[i] || result.pixelData[i+1] || result.pixelData[i+2]) { nonZero = true; break; }
}
if (!nonZero) {
await new Promise(r => setTimeout(r, 50));
await grabPixels();
}
return result;
}
let arr = [];
@ -299,23 +184,13 @@
let item = this.validTxts[i];
// console.log("item=", item);
for (var j = 0; j < item.length; j++) {
let char = item[j];
let result = await drawTxt(char);
let matrix = convertCharToMatrix(result, item);
// 调试:打印每个字符的点阵数据
console.log(`[点阵生成] 字符"${char}" 点阵数据:`, matrix.map(b => '0x' + b.toString(16).padStart(2, '0')).join(' '));
linePixls.push(matrix);
// 在字符间增加轻微延时,避免相邻提取竞争(尤其是末字符)
await new Promise(r => setTimeout(r, 20));
let result = await drawTxt(item[j]);
linePixls.push(convertCharToMatrix(result.pixelData, item));
}
// console.log("hexs=", linePixls.join(","));
arr.push(linePixls);
// 每行结束再等一会,提高末字符稳定性
await new Promise(r => setTimeout(r, 40));
}
// 发送后:再次清空画布,避免残留影响下一次
await this.resetCanvas();
return arr;
}
}
@ -327,5 +202,6 @@
position: fixed;
left: -9999px;
top: -9999px;
visibility: hidden;
}
</style>