Merge pull request #1389 from cracyc/transform

clamp world transform coordinates to 16 bits. #1380
otya128 · Mar 27, 2024 · 1ad921b · 1ad921b
2 parents 14cc370 + 3ef3724
commit 1ad921b
Showing 1 changed file with 12 additions and 4 deletions.
diff --git a/gdi/gdi.c b/gdi/gdi.c
@@ -5012,8 +5012,12 @@ BOOL16 WINAPI DPtoLP16( HDC16 hdc, LPPOINT16 points, INT16 count )
     {
         for (i = 0; i < count; i++)
         {
-            points[i].x = pt32[i].x;
-            points[i].y = pt32[i].y;
+            if (pt32[i].x >= 0x8000) points[i].x = 0x7fff;
+            else if (pt32[i].x < (LONG)0xffff8000) points[i].x = 0x8000;
+            else points[i].x = pt32[i].x;
+            if (pt32[i].y >= 0x8000) points[i].y = 0x7fff;
+            else if (pt32[i].y < (LONG)0xffff8000) points[i].y = 0x8000;
+            else points[i].y = pt32[i].y;
         }
     }
     if (pt32 != points32) HeapFree( GetProcessHeap(), 0, pt32 );
@@ -5043,8 +5047,12 @@ BOOL16 WINAPI LPtoDP16( HDC16 hdc, LPPOINT16 points, INT16 count )
     {
         for (i = 0; i < count; i++)
         {
-            points[i].x = pt32[i].x;
-            points[i].y = pt32[i].y;
+            if (pt32[i].x >= 0x8000) points[i].x = 0x7fff;
+            else if (pt32[i].x < (LONG)0xffff8000) points[i].x = 0x8000;
+            else points[i].x = pt32[i].x;
+            if (pt32[i].y >= 0x8000) points[i].y = 0x7fff;
+            else if (pt32[i].y < (LONG)0xffff8000) points[i].y = 0x8000;
+            else points[i].y = pt32[i].y;
         }
     }
     if (pt32 != points32) HeapFree( GetProcessHeap(), 0, pt32 );