From 40fa7b1e262068b4a0491b60b97df4dcfb102f8b Mon Sep 17 00:00:00 2001
From: 134 <a134@134deMacBook-Pro.local>
Date: Sat, 4 Jul 2026 16:46:04 +0800
Subject: [PATCH] fix: filter scale adjust haze in patch composites

---
 app/api/canvas/local-edit/route.ts | 16 ++++++++++++----
 lib/canvas/generate-image.ts       | 18 ++++++++++++++++--
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index 8b7be22ad..357c49d8b 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -4408,10 +4408,18 @@ export async function POST(request: NextRequest) {
       referenceImages,
       scaleAdjustPatchComposite: scaleAdjustPatchReference
         ? {
-            diffCompareBlurPx: 0.8,
-            diffHighThreshold: 42,
-            diffLowThreshold: 14,
-            featherMaxPx: 42,
+            diffAlphaCutoff:
+              scaleAdjustPatchReference.structureLockedDraft ? 24 : 8,
+            diffAlphaMultiplier:
+              scaleAdjustPatchReference.structureLockedDraft ? 2.25 : 3,
+            diffCompareBlurPx:
+              scaleAdjustPatchReference.structureLockedDraft ? 1.2 : 0.8,
+            diffHighThreshold:
+              scaleAdjustPatchReference.structureLockedDraft ? 72 : 42,
+            diffLowThreshold:
+              scaleAdjustPatchReference.structureLockedDraft ? 26 : 14,
+            featherMaxPx:
+              scaleAdjustPatchReference.structureLockedDraft ? 36 : 42,
             featherMinPx: 10,
             featherRatio: 0.018,
             maskMode: "diff",
diff --git a/lib/canvas/generate-image.ts b/lib/canvas/generate-image.ts
index e29df494e..fd71b56aa 100644
--- a/lib/canvas/generate-image.ts
+++ b/lib/canvas/generate-image.ts
@@ -58,6 +58,8 @@ export interface CanvasScaleAdjustPatchCompositeConfig {
   workspaceRegion: CanvasLocalEditCompositeRegion;
   regions?: CanvasLocalEditCompositeRegion[];
   maskMode?: "workspace" | "diff";
+  diffAlphaCutoff?: number;
+  diffAlphaMultiplier?: number;
   diffLowThreshold?: number;
   diffHighThreshold?: number;
   diffCompareBlurPx?: number;
@@ -405,6 +407,14 @@ function normalizeScaleAdjustPatchCompositeConfig(
     workspaceRegion,
     ...(regions.length > 0 ? { regions } : {}),
     maskMode: value.maskMode === "diff" ? "diff" : "workspace",
+    diffAlphaCutoff: normalizeOptionalNumber(value.diffAlphaCutoff, {
+      max: 96,
+      min: 0,
+    }),
+    diffAlphaMultiplier: normalizeOptionalNumber(value.diffAlphaMultiplier, {
+      max: 6,
+      min: 0.5,
+    }),
     diffHighThreshold: normalizeOptionalNumber(value.diffHighThreshold, {
       max: 120,
       min: 1,
@@ -2961,8 +2971,12 @@ async function applyScaleAdjustPatchCompositeToImages(params: {
               regionClipPatchMaskRaw ||
                 Buffer.alloc(workspaceBox.width * workspaceBox.height, 255)
             ),
-            8,
-            3
+            typeof composite.diffAlphaCutoff === "number"
+              ? composite.diffAlphaCutoff
+              : 8,
+            typeof composite.diffAlphaMultiplier === "number"
+              ? composite.diffAlphaMultiplier
+              : 3
           ),
           height: workspaceBox.height,
           imageBuffer: resizedGeneratedBuffer,