From 04f440574b1d83e1b42b9f5bbe128402ddbffb0e Mon Sep 17 00:00:00 2001
From: 134 <a134@134deMacBook-Pro.local>
Date: Sat, 4 Jul 2026 12:21:17 +0800
Subject: [PATCH] fix: use cutout drafts for scale shrink

---
 app/api/canvas/local-edit/route.ts | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/app/api/canvas/local-edit/route.ts b/app/api/canvas/local-edit/route.ts
index 7b61dc008..0e13e4003 100644
--- a/app/api/canvas/local-edit/route.ts
+++ b/app/api/canvas/local-edit/route.ts
@@ -107,7 +107,7 @@ const SCALE_ADJUST_CROP_MAX_EDGE = 1536;
 const SCALE_ADJUST_PATCH_WORKSPACE_MIN_MARGIN = 0.045;
 const SCALE_ADJUST_PATCH_WORKSPACE_MAX_MARGIN = 0.18;
 const SCALE_ADJUST_LAYOUT_GUIDE_WASH_COLOR = "#f5f7fb";
-const SCALE_ADJUST_LAYOUT_GUIDE_WASH_OPACITY = 0.82;
+const SCALE_ADJUST_LAYOUT_GUIDE_WASH_OPACITY = 0.46;
 const SCALE_ADJUST_STRUCTURE_LOCK_MIN_MASK_RATIO = 0.006;
 const SCALE_ADJUST_STRUCTURE_LOCK_COMPONENT_MIN_RATIO = 0.00018;
 const SCALE_ADJUST_RMBG_MIN_ALPHA_RATIO = 0.012;
@@ -1150,7 +1150,7 @@ function buildScaleAdjustSourceFootprintWashSvg(params: {
       const fill = formatScaleAdjustWashColor(box.background);
       const inner =
         innerRight > innerLeft + 4 && innerBottom > innerTop + 4
-          ? `<rect x="${innerLeft}" y="${innerTop}" width="${innerRight - innerLeft}" height="${innerBottom - innerTop}" rx="${Math.max(4, Math.round(radius * 0.65))}" ry="${Math.max(4, Math.round(radius * 0.65))}" fill="${fill}" fill-opacity="0.08" filter="url(#soft-wash-${index})" />`
+          ? `<rect x="${innerLeft}" y="${innerTop}" width="${innerRight - innerLeft}" height="${innerBottom - innerTop}" rx="${Math.max(4, Math.round(radius * 0.65))}" ry="${Math.max(4, Math.round(radius * 0.65))}" fill="${fill}" fill-opacity="0.18" filter="url(#soft-wash-${index})" />`
           : "";
       return `<rect x="${left}" y="${top}" width="${rectWidth}" height="${rectHeight}" rx="${radius}" ry="${radius}" fill="${fill}" fill-opacity="${SCALE_ADJUST_LAYOUT_GUIDE_WASH_OPACITY}" filter="url(#soft-wash-${index})" />${inner}`;
     })
@@ -2583,6 +2583,28 @@ async function buildScaleAdjustVisualLayoutGuideBuffer(params: {
       continue;
     }
 
+    const shouldUseShrinkCutoutDraft =
+      !structureLockedDraft &&
+      sourceRaw &&
+      userId &&
+      (targetWidthFactor < 0.92 || targetHeightFactor < 0.92);
+    const shrinkCutoutComposite = shouldUseShrinkCutoutDraft
+      ? await buildScaleAdjustRmbgStructureLockedComposite({
+          placement,
+          raw: sourceRaw,
+          sourceBuffer,
+          sourceImageUrl,
+          sourceWidth,
+          userId,
+        })
+      : null;
+
+    if (shrinkCutoutComposite) {
+      subjectWashComposites.push(shrinkCutoutComposite.wash);
+      composites.push(shrinkCutoutComposite.overlay);
+      continue;
+    }
+
     sourceFootprintBoxes.push({
       ...placement.sourceFootprintBox,
       background: sourceRaw
@@ -4136,7 +4158,7 @@ export async function POST(request: NextRequest) {
           ? scaleAdjustPatchReference
             ? scaleAdjustPatchReference.structureLockedDraft
               ? "ai-patch-workspace-structure-locked-draft-v85-one-shot"
-              : "ai-patch-workspace-draft-v72-strong-soft-fill-one-shot"
+              : "ai-patch-workspace-draft-v73-rmbg-cutout-soft-wipe-one-shot"
             : useFalScaleAdjustCoordinatePrompt
             ? "fal-safe-marked-photo-box-guide-no-old-crop-v44-one-shot"
             : useScaleAdjustVisualLayoutGuide