tor-browser

commit 36d547da710414dfe95936277ce13252f4803dea
parent e552e7599f7a19ff234390c32b52f8a64f38cc5f
Author: Botond Ballo <botond@mozilla.com>
Date:   Thu, 13 Nov 2025 04:59:02 +0000

Bug 1730749 - Add a static version of nsDisplayItem::GetPerFrameKey() for use without a display item instance. r=layout-reviewers,emilio

Differential Revision: https://phabricator.services.mozilla.com/D254143

Diffstat:
M
layout/painting/nsDisplayList.h
 | 
14
+++++++++-----

1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/layout/painting/nsDisplayList.h b/layout/painting/nsDisplayList.h
@@ -2266,15 +2266,19 @@ class nsDisplayItem {
    * Pairing this with the Frame() pointer gives a key that
    * uniquely identifies this display item in the display item tree.
    */
-  uint32_t GetPerFrameKey() const {
+  static uint32_t GetPerFrameKey(uint8_t aPageNum, uint16_t aPerFrameIndex,
+                                 DisplayItemType aType) {
     // The top 8 bits are the page index
     // The middle 16 bits of the per frame key uniquely identify the display
     // item when there are more than one item of the same type for a frame.
     // The low 8 bits are the display item type.
-    return (static_cast<uint32_t>(mPageNum)
-            << (TYPE_BITS + (sizeof(mPerFrameIndex) * 8))) |
-           (static_cast<uint32_t>(mPerFrameIndex) << TYPE_BITS) |
-           static_cast<uint32_t>(mType);
+    return (static_cast<uint32_t>(aPageNum)
+            << (TYPE_BITS + (sizeof(aPerFrameIndex) * 8))) |
+           (static_cast<uint32_t>(aPerFrameIndex) << TYPE_BITS) |
+           static_cast<uint32_t>(aType);
+  }
+  uint32_t GetPerFrameKey() const {
+    return GetPerFrameKey(mPageNum, mPerFrameIndex, mType);
   }
 
   /**