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fix(scanQRcode): 修正扫码页面裁切缩放逻辑

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调整了中心裁切区域的计算参数和缩放系数，保证画面不变形同时优化裁切逻辑注释
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“虞渠成” 2026-07-23 16:09:56 +08:00
parent 15c502c959
commit 00baf6574a
1 changed files with 11 additions and 10 deletions
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21
Assets/Scripts/UI/Pages/ConnectDevice/ScanQRcode.cs
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@ -277,15 +277,16 @@ namespace Kill.UI.Pages
// 预览框横向 1080x680 // 预览框横向 1080x680
// 从旋转后的 1080x1920 中截取中间区域并放大 // 从旋转后的 1080x1920 中截取中间区域并放大
// 计算中心裁切区域大小（基于 centerCropRatio） // 计算中心裁切区域大小
int sourceCropH = Mathf.Max(1, Mathf.RoundToInt(camW * centerCropRatio)); // centerCropRatio=1.0 时等于原始裁切（取 targetH 列 / 所有行），无缩放
int sourceCropW = Mathf.Max(1, Mathf.RoundToInt(camH * centerCropRatio)); // centerCropRatio<1.0 时取更小区域放大，值越小放大倍数越大
int sourceCropH = Mathf.Max(1, Mathf.RoundToInt(targetH * centerCropRatio));
int sourceCropW = Mathf.Max(1, Mathf.RoundToInt(targetW * centerCropRatio));
int cropY = (camW - sourceCropH) / 2; int cropY = (camW - sourceCropH) / 2;
int cropX = (camH - sourceCropW) / 2; int cropX = (camH - sourceCropW) / 2;
// 计算缩放比例 // 两个方向缩放一致，保证不变形
float scaleY = (float)sourceCropH / targetH; float scale = centerCropRatio;
float scaleX = (float)sourceCropW / targetW;
// 获取相机像素数据 // 获取相机像素数据
Color32[] cameraPixels = webCamTexture.GetPixels32(); Color32[] cameraPixels = webCamTexture.GetPixels32();
@ -293,14 +294,14 @@ namespace Kill.UI.Pages
// 顺时针旋转90度 + 中心裁切 + 缩放 // 顺时针旋转90度 + 中心裁切 + 缩放
// 目标像素 (x, y) 对应源坐标： // 目标像素 (x, y) 对应源坐标：
// srcX = cropY + (targetH-1-y) * scaleY (裁切区域内纵向缩放) // srcX = cropY + (targetH-1-y) * scale (裁切区域内纵向缩放)
// srcY = cropX + x * scaleX (裁切区域内横向缩放) // srcY = cropX + x * scale (裁切区域内横向缩放)
for (int y = 0; y < targetH; y++) for (int y = 0; y < targetH; y++)
{ {
for (int x = 0; x < targetW; x++) for (int x = 0; x < targetW; x++)
{ {
float srcX = cropY + (targetH - 1 - y) * scaleY; float srcX = cropY + (targetH - 1 - y) * scale;
float srcY = cropX + x * scaleX; float srcY = cropX + x * scale;
// 双线性插值采样 // 双线性插值采样
int sx = (int)srcX; int sx = (int)srcX;