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fix(ai-assistant): 优化图片压缩逻辑避免重复质量压缩

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- 新增 forceCompress 参数控制是否强制质量压缩
- compressImageForAI: 始终进行质量压缩（发送给 AI）
- saveImageToCache: 仅在需要缩小尺寸时才压缩（避免已压缩图片被重复压缩）

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
kuaifan 2026-01-20 14:52:57 +00:00
parent f7d5040b02
commit 95c6b53f10
1 changed files with 12 additions and 8 deletions
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20
resources/assets/js/components/AIAssistant/index.vue
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@ -1884,9 +1884,9 @@ export default {
* @returns {Promise<string>} - Base64 data URL (image/jpeg)
*/
async compressImageForAI(file) {
// File 转 dataUrl 后压缩到 1024px
// File 转 dataUrl 后压缩到 1024px，强制质量压缩
const dataUrl = await this.fileToDataUrl(file);
return this.resizeDataUrl(dataUrl, 1024);
return this.resizeDataUrl(dataUrl, 1024, true);
},
/**
@ -1956,9 +1956,10 @@ export default {
* 压缩 dataUrl 图片到指定尺寸
* @param {string} dataUrl - Base64 图片
* @param {number} maxSize - 最大边长
* @param {boolean} forceCompress - 是否强制质量压缩（即使尺寸不变）
* @returns {Promise<string>} - 压缩后的 dataUrl
*/
resizeDataUrl(dataUrl, maxSize) {
resizeDataUrl(dataUrl, maxSize, forceCompress = false) {
return new Promise((resolve, reject) => {
// 参数校验
if (!dataUrl || typeof dataUrl !== 'string') {
@ -1968,15 +1969,18 @@ export default {
const img = new Image();
img.onload = () => {
let {width, height} = img;
// 如果已经小于目标尺寸，直接返回原图
if (width <= maxSize && height <= maxSize) {
const needResize = width > maxSize || height > maxSize;
// 如果不需要缩放且不强制压缩，直接返回原图
if (!needResize && !forceCompress) {
resolve(dataUrl);
return;
}
// 计算缩放比例
const ratio = Math.min(maxSize / width, maxSize / height);
width = Math.round(width * ratio);
height = Math.round(height * ratio);
if (needResize) {
const ratio = Math.min(maxSize / width, maxSize / height);
width = Math.round(width * ratio);
height = Math.round(height * ratio);
}
// Canvas 压缩
const canvas = document.createElement('canvas');
canvas.width = width;