ensure comparison container size matches image display size and respects parent

apps/jingrow/frontend/src/views/tools/RemoveBackground.vue

@@ -72,7 +72,12 @@
                   class="comparison-image original-image" 
                   :style="{ clipPath: `inset(0 ${100 - splitPosition}% 0 0)` }"
                 >
-                  <img :src="uploadedImageUrl" alt="Original" />
+                  <img 
+                    ref="originalImageRef"
+                    :src="uploadedImageUrl" 
+                    alt="Original"
+                    @load="adjustContainerSize"
+                  />
                 </div>
                 
                 <!-- 去背景后的图片（显示右侧部分） -->
@@ -80,7 +85,12 @@
                   class="comparison-image result-image" 
                   :style="{ clipPath: `inset(0 0 0 ${splitPosition}%)` }"
                 >
-                  <img :src="resultImageUrl" alt="Result" />
+                  <img 
+                    ref="resultImageRef"
+                    :src="resultImageUrl" 
+                    alt="Result"
+                    @load="adjustContainerSize"
+                  />
                 </div>
                 
                 <!-- 拖动竖线 -->
@@ -160,7 +170,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, computed } from 'vue'
+import { ref, computed, nextTick, watch, onMounted, onUnmounted } from 'vue'
 import { useMessage } from 'naive-ui'
 import axios from 'axios'
 import { t } from '@/shared/i18n'
@@ -204,8 +214,81 @@ const dragCounter = ref(0)
 const processing = ref(false)
 const splitPosition = ref(0) // 分割线位置（百分比），0表示最左边，默认只显示结果图
 const comparisonContainerRef = ref<HTMLElement | null>(null)
+const originalImageRef = ref<HTMLImageElement | null>(null)
+const resultImageRef = ref<HTMLImageElement | null>(null)
 const isDraggingSplitLine = ref(false)
 
+// 调整容器大小以匹配图片实际显示尺寸
+const adjustContainerSize = () => {
+  nextTick(() => {
+    if (!comparisonContainerRef.value) return
+    
+    // 使用原图或结果图的尺寸（它们应该相同）
+    const img = originalImageRef.value || resultImageRef.value
+    if (!img) return
+    
+    // 获取父元素 preview-section 的实际可用尺寸
+    const container = comparisonContainerRef.value
+    const previewSection = container.closest('.preview-section') as HTMLElement
+    if (!previewSection) return
+    
+    const previewRect = previewSection.getBoundingClientRect()
+    // 考虑 padding (12px * 2 = 24px)
+    const maxAvailableWidth = Math.max(0, previewRect.width - 24)
+    const maxAvailableHeight = Math.max(0, previewRect.height - 24)
+    
+    if (maxAvailableWidth <= 0 || maxAvailableHeight <= 0) return
+    
+    // 等待图片加载完成
+    if (!img.complete) {
+      // 如果图片还没加载完成，等待加载完成后再计算
+      // 使用 once: true 确保只触发一次
+      img.addEventListener('load', adjustContainerSize, { once: true })
+      return
+    }
+    
+    const naturalWidth = img.naturalWidth
+    const naturalHeight = img.naturalHeight
+    
+    if (naturalWidth === 0 || naturalHeight === 0) return
+    
+    // 根据图片的自然尺寸和父元素的可用空间，计算合适的显示尺寸
+    // 保持图片宽高比，同时确保不超过父元素的可用空间
+    const scaleX = maxAvailableWidth / naturalWidth
+    const scaleY = maxAvailableHeight / naturalHeight
+    const scale = Math.min(scaleX, scaleY, 1) // 取较小的缩放比例，且不放大（不超过1）
+    
+    const displayWidth = naturalWidth * scale
+    const displayHeight = naturalHeight * scale
+    
+    // 确保最终尺寸不超过父元素的可用空间（双重保险）
+    const finalWidth = Math.min(displayWidth, maxAvailableWidth)
+    const finalHeight = Math.min(displayHeight, maxAvailableHeight)
+    
+    // 设置容器大小为计算出的尺寸
+    comparisonContainerRef.value.style.width = `${finalWidth}px`
+    comparisonContainerRef.value.style.height = `${finalHeight}px`
+  })
+}
+
+// 监听图片加载完成
+watch([uploadedImageUrl, resultImageUrl], () => {
+  adjustContainerSize()
+}, { immediate: true })
+
+// 监听窗口大小变化
+const handleResize = () => {
+  adjustContainerSize()
+}
+
+onMounted(() => {
+  window.addEventListener('resize', handleResize)
+})
+
+onUnmounted(() => {
+  window.removeEventListener('resize', handleResize)
+})
+
 // 触发文件选择
 const triggerFileInput = () => {
   if (fileInputRef.value) {
@@ -306,6 +389,11 @@ const resetUpload = () => {
   if (fileInputRef.value) {
     fileInputRef.value.value = ''
   }
+  // 重置容器大小
+  if (comparisonContainerRef.value) {
+    comparisonContainerRef.value.style.width = ''
+    comparisonContainerRef.value.style.height = ''
+  }
 }
 
 // 选择历史记录项
@@ -920,17 +1008,19 @@ h1 {
 .comparison-view {
   width: 100%;
   height: 100%;
+  max-width: 100%;
+  max-height: 100%;
   display: flex;
   justify-content: center;
   align-items: center;
+  overflow: hidden;
 }
 
 .comparison-container {
   position: relative;
   display: inline-block;
-  /* 固定尺寸，避免子元素高度计算错误 */
-  width: min(90vw, calc(100vh - 200px));
-  height: min(90vw, calc(100vh - 200px));
+  /* 容器大小由 JavaScript 动态设置，匹配图片实际显示尺寸 */
+  /* 同时设置 max-width 和 max-height 作为安全限制，确保不超过父元素 */
   max-width: 100%;
   max-height: 100%;
   overflow: hidden;
@@ -957,6 +1047,7 @@ h1 {
   
   img {
     display: block;
+    /* 图片限制在容器内，不超过父元素 */
     max-width: 100%;
     max-height: 100%;
     width: auto;
@@ -977,6 +1068,7 @@ h1 {
   
   img {
     display: block;
+    /* 图片限制在容器内，不超过父元素 */
     max-width: 100%;
     max-height: 100%;
     width: auto;
@@ -996,6 +1088,7 @@ h1 {
   
   img {
     display: block;
+    /* 图片限制在容器内，不超过父元素 */
     max-width: 100%;
     max-height: 100%;
     width: auto;