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-rw-r--r--layout/base/nsLayoutUtils.cpp34
1 files changed, 34 insertions, 0 deletions
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 5de6f2013..9b204d734 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -149,6 +149,7 @@ using namespace mozilla::gfx;
#define GRID_ENABLED_PREF_NAME "layout.css.grid.enabled"
#define GRID_TEMPLATE_SUBGRID_ENABLED_PREF_NAME "layout.css.grid-template-subgrid-value.enabled"
#define WEBKIT_PREFIXES_ENABLED_PREF_NAME "layout.css.prefixes.webkit"
+#define DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME "layout.css.display-flow-root.enabled"
#define DISPLAY_CONTENTS_ENABLED_PREF_NAME "layout.css.display-contents.enabled"
#define TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME "layout.css.text-align-unsafe-value.enabled"
#define FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME "layout.css.float-logical-values.enabled"
@@ -314,6 +315,37 @@ WebkitPrefixEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
}
}
+// When the pref "layout.css.display-flow-root.enabled" changes, this function is
+// invoked to let us update kDisplayKTable, to selectively disable or restore
+// the entries for "flow-root" in that table.
+static void
+DisplayFlowRootEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
+{
+ NS_ASSERTION(strcmp(aPrefName, DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME) == 0,
+ "Did you misspell " DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME " ?");
+
+ static bool sIsDisplayFlowRootKeywordIndexInitialized;
+ static int32_t sIndexOfFlowRootInDisplayTable;
+ bool isDisplayFlowRootEnabled =
+ Preferences::GetBool(DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME, false);
+
+ if (!sIsDisplayFlowRootKeywordIndexInitialized) {
+ // First run: find the position of "flow-root" in kDisplayKTable.
+ sIndexOfFlowRootInDisplayTable =
+ nsCSSProps::FindIndexOfKeyword(eCSSKeyword_flow_root,
+ nsCSSProps::kDisplayKTable);
+ sIsDisplayFlowRootKeywordIndexInitialized = true;
+ }
+
+ // OK -- now, stomp on or restore the "flow-root" entry in kDisplayKTable,
+ // depending on whether the pref is enabled vs. disabled.
+ if (sIndexOfFlowRootInDisplayTable >= 0) {
+ nsCSSProps::kDisplayKTable[sIndexOfFlowRootInDisplayTable].mKeyword =
+ isDisplayFlowRootEnabled ? eCSSKeyword_flow_root : eCSSKeyword_UNKNOWN;
+ }
+}
+
+
// When the pref "layout.css.display-contents.enabled" changes, this function is
// invoked to let us update kDisplayKTable, to selectively disable or restore
// the entries for "contents" in that table.
@@ -7635,6 +7667,8 @@ static const PrefCallbacks kPrefCallbacks[] = {
WebkitPrefixEnabledPrefChangeCallback },
{ TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME,
TextAlignUnsafeEnabledPrefChangeCallback },
+ { DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME,
+ DisplayFlowRootEnabledPrefChangeCallback },
{ DISPLAY_CONTENTS_ENABLED_PREF_NAME,
DisplayContentsEnabledPrefChangeCallback },
{ FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME,