From 8d21d05f2524883eda6e0c1257afcea944cfc7d3 Mon Sep 17 00:00:00 2001
From: Danila Poyarkov <dev@dannote.net>
Date: Sat, 16 May 2026 18:43:24 +0300
Subject: [PATCH] fix(clipboard): convert quadratic beziers to cubic instead of
 flattening to lines

---
 .../src/kiwi/node-change/path-commands.ts     | 39 ++++++++++++++-----
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/packages/core/src/kiwi/node-change/path-commands.ts b/packages/core/src/kiwi/node-change/path-commands.ts
index f207e19c6..1b657f1ff 100644
--- a/packages/core/src/kiwi/node-change/path-commands.ts
+++ b/packages/core/src/kiwi/node-change/path-commands.ts
@@ -12,33 +12,54 @@ export function encodePathCommandsBlob(commands: OutlineCommand[], scale = 1): U
     new DataView(buf).setFloat32(0, (value ?? 0) / scale, true)
     bytes.push(...new Uint8Array(buf))
   }
+  const negY = (v: number | undefined) => (v === undefined ? undefined : -v)
+
+  let curX = 0
+  let curY = 0
 
   for (const command of commands) {
     switch (command.type) {
       case 'M':
         bytes.push(CMD_MOVE_TO)
         pushFloat(command.x)
-        pushFloat(command.y === undefined ? undefined : -command.y)
+        pushFloat(negY(command.y))
+        curX = command.x ?? 0
+        curY = command.y ?? 0
         break
       case 'L':
         bytes.push(CMD_LINE_TO)
         pushFloat(command.x)
-        pushFloat(command.y === undefined ? undefined : -command.y)
+        pushFloat(negY(command.y))
+        curX = command.x ?? 0
+        curY = command.y ?? 0
         break
       case 'C':
         bytes.push(CMD_CUBIC_TO)
         pushFloat(command.x1)
-        pushFloat(command.y1 === undefined ? undefined : -command.y1)
+        pushFloat(negY(command.y1))
         pushFloat(command.x2)
-        pushFloat(command.y2 === undefined ? undefined : -command.y2)
+        pushFloat(negY(command.y2))
         pushFloat(command.x)
-        pushFloat(command.y === undefined ? undefined : -command.y)
+        pushFloat(negY(command.y))
+        curX = command.x ?? 0
+        curY = command.y ?? 0
         break
-      case 'Q':
-        bytes.push(CMD_LINE_TO)
-        pushFloat(command.x)
-        pushFloat(command.y === undefined ? undefined : -command.y)
+      case 'Q': {
+        const qx1 = command.x1 ?? 0
+        const qy1 = command.y1 ?? 0
+        const qx = command.x ?? 0
+        const qy = command.y ?? 0
+        bytes.push(CMD_CUBIC_TO)
+        pushFloat(curX + (2 / 3) * (qx1 - curX))
+        pushFloat(negY(curY + (2 / 3) * (qy1 - curY)))
+        pushFloat(qx + (2 / 3) * (qx1 - qx))
+        pushFloat(negY(qy + (2 / 3) * (qy1 - qy)))
+        pushFloat(qx)
+        pushFloat(negY(qy))
+        curX = qx
+        curY = qy
         break
+      }
       case 'Z':
         bytes.push(CMD_CLOSE)
         break