From 20693db8b9f254d31d3094a38a1f82f7f30c40c2 Mon Sep 17 00:00:00 2001
From: 134 <a134@134deMacBook-Pro.local>
Date: Sun, 5 Jul 2026 12:52:44 +0800
Subject: [PATCH] fix: aggressively clear protected draft dark residue

---
 app/api/canvas/local-edit/route.ts | 38 ++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index 3a8e43a9b..2bb7fff2c 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -2657,31 +2657,49 @@ function suppressScaleAdjustProtectedFurnitureDarkAlpha(params: {
     return sourceY >= sourceBox.height * 0.3;
   };
 
+  let clearedPixels = 0;
+  let markedPixels = 0;
   for (let localY = 0; localY < bbox.height; localY += 1) {
     for (let localX = 0; localX < bbox.width; localX += 1) {
       const alphaIndex = localY * bbox.width + localX;
       const alpha = output[alphaIndex] || 0;
       if (alpha === 0) continue;
+      markedPixels += 1;
 
       const colorIndex = alphaIndex * 3;
       const r = rawRgb[colorIndex] || 0;
       const g = rawRgb[colorIndex + 1] || 0;
       const b = rawRgb[colorIndex + 2] || 0;
       const { luma, saturation } = getScaleAdjustPixelStats(r, g, b);
-      const veryDark = luma < 72;
-      const flatDark = luma < 110 && saturation < 0.28;
-      if (!veryDark && !flatDark) continue;
-
       const sourceX = bbox.left + localX;
       const sourceY = bbox.top + localY;
-      if (isProtectedSideArea(sourceX, sourceY)) {
-        output[alphaIndex] = 0;
-      } else {
-        output[alphaIndex] = 0;
-      }
+      const inProtectedSideArea = isProtectedSideArea(sourceX, sourceY);
+      const neutralDark =
+        luma < 150 &&
+        (saturation < 0.55 || (r < 110 && g < 110 && b < 110));
+      const lowContrastDark = luma < 132 && saturation < 0.32;
+      const shouldClear = inProtectedSideArea
+        ? neutralDark || lowContrastDark
+        : luma < 100 || (luma < 132 && saturation < 0.22);
+      if (!shouldClear) continue;
+
+      output[alphaIndex] = 0;
+      clearedPixels += 1;
     }
   }
 
+  if (markedPixels > 0) {
+    console.info(
+      "[Canvas Local Edit] Scale adjust protected furniture dark alpha cleared:",
+      {
+        clearedRatio: Number((clearedPixels / markedPixels).toFixed(3)),
+        clearedPixels,
+        protectedPersonSide,
+        totalMarkedPixels: markedPixels,
+      }
+    );
+  }
+
   return output;
 }
 
@@ -4934,7 +4952,7 @@ export async function POST(request: NextRequest) {
         scaleAdjustPromptStrategy: isScaleAdjustOperation
           ? scaleAdjustPatchReference
             ? useScaleAdjustFullFrameStructurePatch
-              ? "full-frame-structure-locked-draft-v5-protected-side-dark-cleared-one-shot"
+              ? "full-frame-structure-locked-draft-v6-protected-side-dark-cleared-one-shot"
               : scaleAdjustPatchReference.structureLockedDraft
               ? "ai-patch-workspace-structure-locked-draft-v87-subject-alpha-clipped-one-shot"
               : "ai-patch-workspace-draft-v75-soft-wipe-erase-ghost-one-shot"