From 8ded477edd11dc3d7eda3b906dc2ca9caa64a5f8 Mon Sep 17 00:00:00 2001
From: 134 <a134@134deMacBook-Pro.local>
Date: Mon, 29 Jun 2026 11:24:27 +0800
Subject: [PATCH] fix: avoid rejecting final scale adjust candidate

---
 app/api/canvas/local-edit/route.ts |  9 ++++++++-
 lib/canvas/generate-image.ts       | 21 ++++++++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index 8d223cfe5..94ffb1bd0 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -1476,6 +1476,13 @@ export async function POST(request: NextRequest) {
             : {}),
         }
       : undefined;
+    const scaleAdjustFinalRetryVerificationConfig =
+      scaleAdjustVerificationConfig && useFalScaleAdjustMockup
+        ? {
+            ...scaleAdjustVerificationConfig,
+            allowOutsideChangedWhenChangedInside: true,
+          }
+        : scaleAdjustVerificationConfig;
 
     const imageRequest: CanvasGenerateImageRequest = {
       aspectRatio: resolvedAspectRatio,
@@ -1576,7 +1583,7 @@ export async function POST(request: NextRequest) {
               prompt: falScaleAdjustGuideOnlyPrompt,
               promptExtend: false,
               referenceImages: [annotatedUpload.url],
-              scaleAdjustVerification: scaleAdjustVerificationConfig,
+              scaleAdjustVerification: scaleAdjustFinalRetryVerificationConfig,
             },
           ]
         : undefined,
diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index 35280cb27..0cdb58fbf 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -52,6 +52,7 @@ export interface CanvasLocalEditCompositeConfig {
 }
 
 export interface CanvasScaleAdjustVerificationConfig {
+  allowOutsideChangedWhenChangedInside?: boolean;
   protectedRegions?: CanvasLocalEditCompositeRegion[];
   rejectFailedCandidates?: boolean;
   sourceImageUrl: string;
@@ -388,6 +389,8 @@ function normalizeScaleAdjustVerificationConfig(
     ? {
         sourceImageUrl,
         regions,
+        allowOutsideChangedWhenChangedInside:
+          value.allowOutsideChangedWhenChangedInside === true,
         rejectFailedCandidates: value.rejectFailedCandidates === true,
         ...(targetRegions.length > 0 ? { targetRegions } : {}),
         ...(typeof scalePercent === "number" ? { scalePercent } : {}),
@@ -1161,9 +1164,25 @@ async function applyScaleAdjustVerificationToImages(params: {
     score: Number(scoreEvaluation(selected).toFixed(2)),
   });
 
+  const outsideChangeAccepted =
+    verification.allowOutsideChangedWhenChangedInside &&
+    selected.changedInside &&
+    selected.outsideChanged;
+  if (outsideChangeAccepted) {
+    console.warn("[Canvas Generate Image] Scale adjust accepting best AI candidate despite outside-frame diff:", {
+      debugLabel,
+      imageIndex: selected.index,
+      outsidePixelStats: {
+        changedRatio: Number(selected.outsidePixelStats.changedRatio.toFixed(4)),
+        meanDiff: Number(selected.outsidePixelStats.meanDiff.toFixed(2)),
+      },
+      regionDiffScores: selected.diffScores.map((score) => Number(score.toFixed(2))),
+    });
+  }
+
   if (
     verification.rejectFailedCandidates &&
-    (!selected.changedInside || selected.outsideChanged)
+    (!selected.changedInside || (selected.outsideChanged && !outsideChangeAccepted))
   ) {
     throw new ScaleAdjustOutputRejectedError({
       reason: selected.outsideChanged