fix: prefer pixel structure for furniture scale edits

app/api/canvas/local-edit/route.ts

@@ -1349,6 +1349,13 @@ function isScaleAdjustPersonLikePrompt(prompt: string) {
   );
 }
 
+function isScaleAdjustFurnitureProductLikePrompt(prompt: string) {
+  const text = normalizeScaleAdjustModelText(prompt);
+  return /furniture|product|object|chair|sofa|table|desk|cabinet|shelf|rack|lamp|cart|wheel|wood|woven|cane|rattan|panel|商品|产品|物体|家具|家居|椅|沙发|茶几|桌|柜|架|衣帽架|置物架|收纳|灯|车|轮|木|藤编|编织|面板|杆|挂包|帽子|伞/.test(
+    text
+  );
+}
+
 function hasScaleAdjustPersonPixelSignal(params: {
   box: { left: number; top: number; width: number; height: number };
   raw: Buffer;
@@ -2438,6 +2445,7 @@ async function buildScaleAdjustRmbgStructureLockedComposite(params: {
 async function buildScaleAdjustStructureLockedComposite(params: {
   includePersonPixels?: boolean;
   placement: ReturnType<typeof getScaleAdjustVisualGuidePlacement>;
+  preferPixelStructure?: boolean;
   raw: Buffer;
   sourceBuffer: Buffer;
   sourceImageUrl?: string;
@@ -2447,6 +2455,7 @@ async function buildScaleAdjustStructureLockedComposite(params: {
   const {
     includePersonPixels = false,
     placement,
+    preferPixelStructure = false,
     raw,
     sourceBuffer,
     sourceImageUrl,
@@ -2455,9 +2464,10 @@ async function buildScaleAdjustStructureLockedComposite(params: {
   } = params;
   // The current RMBG provider can bake horizontal matte stripes into furniture cutouts.
   const allowRmbgStructureLock =
-    process.env.CANVAS_SCALE_ADJUST_ENABLE_RMBG_STRUCTURE === "1" ||
-    (includePersonPixels &&
-      process.env.CANVAS_SCALE_ADJUST_DISABLE_PERSON_RMBG !== "1");
+    !preferPixelStructure &&
+    (process.env.CANVAS_SCALE_ADJUST_ENABLE_RMBG_STRUCTURE === "1" ||
+      (includePersonPixels &&
+        process.env.CANVAS_SCALE_ADJUST_DISABLE_PERSON_RMBG !== "1"));
   const rmbgComposite = !allowRmbgStructureLock
     ? null
     : await buildScaleAdjustRmbgStructureLockedComposite({
@@ -2768,16 +2778,25 @@ async function buildScaleAdjustVisualLayoutGuideBuffer(params: {
         targetHeightFactor > 1.08 ||
         targetWidthFactor < 0.92 ||
         targetHeightFactor < 0.92);
+    const preferPixelStructure = isScaleAdjustFurnitureProductLikePrompt(
+      region.prompt
+    );
+    const hasPersonPixels =
+      !preferPixelStructure &&
+      !!sourceRaw &&
+      hasScaleAdjustPersonPixelSignal({
+        box: placement.sourceBox,
+        raw: sourceRaw,
+        width: sourceWidth,
+      });
+    const includePersonPixels =
+      !preferPixelStructure &&
+      (isScaleAdjustPersonLikePrompt(region.prompt) || hasPersonPixels);
     const structureLockedComposite = shouldUseStructureLock
       ? await buildScaleAdjustStructureLockedComposite({
-          includePersonPixels:
-            isScaleAdjustPersonLikePrompt(region.prompt) ||
-            hasScaleAdjustPersonPixelSignal({
-              box: placement.sourceBox,
-              raw: sourceRaw,
-              width: sourceWidth,
-            }),
+          includePersonPixels,
           placement,
+          preferPixelStructure,
           raw: sourceRaw,
           sourceBuffer,
           sourceImageUrl,