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-rw-r--r--layout/style/nsCSSProps.cpp257
1 files changed, 257 insertions, 0 deletions
diff --git a/layout/style/nsCSSProps.cpp b/layout/style/nsCSSProps.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * methods for dealing with CSS properties and tables of the keyword
+ * values they accept
+ */
+
+#include "nsCSSProps.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Casting.h"
+
+#include "gfxPlatform.h"
+#include "nsLayoutUtils.h"
+#include "nsIWidget.h"
+#include "nsStyleConsts.h" // For system widget appearance types
+
+#include "mozilla/dom/Animation.h"
+#include "mozilla/dom/AnimationEffectBinding.h" // for PlaybackDirection
+#include "mozilla/gfx/gfxVars.h" // for UseWebRender
+#include "mozilla/gfx/gfxVarReceiver.h"
+#include "mozilla/LookAndFeel.h" // for system colors
+
+#include "nsString.h"
+#include "nsStaticNameTable.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/StaticPrefs_layout.h"
+
+using namespace mozilla;
+
+static int32_t gPropertyTableRefCount;
+static nsStaticCaseInsensitiveNameTable* gFontDescTable;
+static nsStaticCaseInsensitiveNameTable* gCounterDescTable;
+static nsDataHashtable<nsCStringHashKey, nsCSSPropertyID>*
+ gPropertyIDLNameTable;
+
+static const char* const kCSSRawFontDescs[] = {
+#define CSS_FONT_DESC(name_, method_) #name_,
+#include "nsCSSFontDescList.h"
+#undef CSS_FONT_DESC
+};
+
+static const char* const kCSSRawCounterDescs[] = {
+#define CSS_COUNTER_DESC(name_, method_) #name_,
+#include "nsCSSCounterDescList.h"
+#undef CSS_COUNTER_DESC
+};
+
+static nsStaticCaseInsensitiveNameTable* CreateStaticTable(
+ const char* const aRawTable[], int32_t aLength) {
+ auto table = new nsStaticCaseInsensitiveNameTable(aRawTable, aLength);
+#ifdef DEBUG
+ // Partially verify the entries.
+ for (int32_t index = 0; index < aLength; ++index) {
+ nsAutoCString temp(aRawTable[index]);
+ MOZ_ASSERT(-1 == temp.FindChar('_'),
+ "underscore char in case insensitive name table");
+ }
+#endif
+ return table;
+}
+
+void nsCSSProps::RecomputeEnabledState(const char* aPref, void*) {
+ MOZ_RELEASE_ASSERT(NS_IsMainThread());
+ DebugOnly<bool> foundPref = false;
+ for (const PropertyPref* pref = kPropertyPrefTable;
+ pref->mPropID != eCSSProperty_UNKNOWN; pref++) {
+ if (!aPref || !strcmp(aPref, pref->mPref)) {
+ foundPref = true;
+#ifdef FUZZING
+ gPropertyEnabled[pref->mPropID] = true;
+#else
+ gPropertyEnabled[pref->mPropID] = Preferences::GetBool(pref->mPref);
+#endif
+ if (pref->mPropID == eCSSProperty_backdrop_filter) {
+ gPropertyEnabled[pref->mPropID] &=
+ gfx::gfxVars::GetUseWebRenderOrDefault();
+ }
+ }
+ }
+ MOZ_ASSERT(foundPref);
+}
+
+void nsCSSProps::AddRefTable(void) {
+ if (0 == gPropertyTableRefCount++) {
+ MOZ_ASSERT(!gFontDescTable, "pre existing array!");
+ MOZ_ASSERT(!gCounterDescTable, "pre existing array!");
+ MOZ_ASSERT(!gPropertyIDLNameTable, "pre existing array!");
+
+ gFontDescTable = CreateStaticTable(kCSSRawFontDescs, eCSSFontDesc_COUNT);
+ gCounterDescTable =
+ CreateStaticTable(kCSSRawCounterDescs, eCSSCounterDesc_COUNT);
+
+ gPropertyIDLNameTable =
+ new nsDataHashtable<nsCStringHashKey, nsCSSPropertyID>;
+ for (nsCSSPropertyID p = nsCSSPropertyID(0);
+ size_t(p) < ArrayLength(kIDLNameTable); p = nsCSSPropertyID(p + 1)) {
+ if (kIDLNameTable[p]) {
+ gPropertyIDLNameTable->Put(nsDependentCString(kIDLNameTable[p]), p);
+ }
+ }
+
+ static bool prefObserversInited = false;
+ if (!prefObserversInited) {
+ prefObserversInited = true;
+ for (const PropertyPref* pref = kPropertyPrefTable;
+ pref->mPropID != eCSSProperty_UNKNOWN; pref++) {
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=1472523
+ // We need to use nsCString instead of substring because the preference
+ // callback code stores them. Using AssignLiteral prevents any
+ // unnecessary allocations.
+ nsCString prefName;
+ prefName.AssignLiteral(pref->mPref, strlen(pref->mPref));
+ Preferences::RegisterCallback(nsCSSProps::RecomputeEnabledState,
+ prefName);
+ }
+ RecomputeEnabledState(/* aPrefName = */ nullptr);
+ }
+ }
+}
+
+void nsCSSProps::ReleaseTable(void) {
+ if (0 == --gPropertyTableRefCount) {
+ delete gFontDescTable;
+ gFontDescTable = nullptr;
+
+ delete gCounterDescTable;
+ gCounterDescTable = nullptr;
+
+ delete gPropertyIDLNameTable;
+ gPropertyIDLNameTable = nullptr;
+ }
+}
+
+/* static */
+bool nsCSSProps::IsCustomPropertyName(const nsACString& aProperty) {
+ return aProperty.Length() >= CSS_CUSTOM_NAME_PREFIX_LENGTH &&
+ StringBeginsWith(aProperty, "--"_ns);
+}
+
+nsCSSPropertyID nsCSSProps::LookupPropertyByIDLName(
+ const nsACString& aPropertyIDLName, EnabledState aEnabled) {
+ MOZ_ASSERT(gPropertyIDLNameTable, "no lookup table, needs addref");
+ nsCSSPropertyID res;
+ if (!gPropertyIDLNameTable->Get(aPropertyIDLName, &res)) {
+ return eCSSProperty_UNKNOWN;
+ }
+ MOZ_ASSERT(res < eCSSProperty_COUNT);
+ if (!IsEnabled(res, aEnabled)) {
+ return eCSSProperty_UNKNOWN;
+ }
+ return res;
+}
+
+nsCSSFontDesc nsCSSProps::LookupFontDesc(const nsACString& aFontDesc) {
+ MOZ_ASSERT(gFontDescTable, "no lookup table, needs addref");
+ nsCSSFontDesc which = nsCSSFontDesc(gFontDescTable->Lookup(aFontDesc));
+
+ if (which == eCSSFontDesc_Display &&
+ !StaticPrefs::layout_css_font_display_enabled()) {
+ which = eCSSFontDesc_UNKNOWN;
+ }
+ return which;
+}
+
+const nsCString& nsCSSProps::GetStringValue(nsCSSFontDesc aFontDescID) {
+ MOZ_ASSERT(gFontDescTable, "no lookup table, needs addref");
+ if (gFontDescTable) {
+ return gFontDescTable->GetStringValue(int32_t(aFontDescID));
+ } else {
+ static nsDependentCString sNullStr("");
+ return sNullStr;
+ }
+}
+
+const nsCString& nsCSSProps::GetStringValue(nsCSSCounterDesc aCounterDesc) {
+ MOZ_ASSERT(gCounterDescTable, "no lookup table, needs addref");
+ if (gCounterDescTable) {
+ return gCounterDescTable->GetStringValue(int32_t(aCounterDesc));
+ } else {
+ static nsDependentCString sNullStr("");
+ return sNullStr;
+ }
+}
+const CSSPropFlags nsCSSProps::kFlagsTable[eCSSProperty_COUNT] = {
+#define CSS_PROP_LONGHAND(name_, id_, method_, flags_, ...) flags_,
+#define CSS_PROP_SHORTHAND(name_, id_, method_, flags_, ...) flags_,
+#include "mozilla/ServoCSSPropList.h"
+#undef CSS_PROP_SHORTHAND
+#undef CSS_PROP_LONGHAND
+};
+
+/* static */
+bool nsCSSProps::gPropertyEnabled[eCSSProperty_COUNT_with_aliases] = {
+// If the property has any "ENABLED_IN" flag set, it is disabled by
+// default. Note that, if a property has pref, whatever its default
+// value is, it will later be changed in nsCSSProps::AddRefTable().
+// If the property has "ENABLED_IN" flags but doesn't have a pref,
+// it is an internal property which is disabled elsewhere.
+#define IS_ENABLED_BY_DEFAULT(flags_) \
+ (!((flags_) & (CSSPropFlags::EnabledMask | CSSPropFlags::Inaccessible)))
+
+#define CSS_PROP_LONGHAND(name_, id_, method_, flags_, ...) \
+ IS_ENABLED_BY_DEFAULT(flags_),
+#define CSS_PROP_SHORTHAND(name_, id_, method_, flags_, ...) \
+ IS_ENABLED_BY_DEFAULT(flags_),
+#define CSS_PROP_ALIAS(...) true,
+#include "mozilla/ServoCSSPropList.h"
+#undef CSS_PROP_ALIAS
+#undef CSS_PROP_SHORTHAND
+#undef CSS_PROP_LONGHAND
+
+#undef IS_ENABLED_BY_DEFAULT
+};
+
+/**
+ * A singleton class to register as a receiver for gfxVars.
+ * Updates the state of backdrop-filter's pref if the gfx
+ * WebRender var changes state.
+ */
+class nsCSSPropsGfxVarReceiver final : public gfx::gfxVarReceiver {
+ constexpr nsCSSPropsGfxVarReceiver() = default;
+
+ // WebRender's last known enabled state.
+ static bool sLastKnownUseWebRender;
+ static nsCSSPropsGfxVarReceiver sInstance;
+
+ public:
+ static gfx::gfxVarReceiver& GetInstance() { return sInstance; }
+
+ void OnVarChanged(const gfx::GfxVarUpdate&) override {
+ bool enabled = gfxVars::UseWebRender();
+ if (sLastKnownUseWebRender != enabled) {
+ sLastKnownUseWebRender = enabled;
+ nsCSSProps::RecomputeEnabledState("layout.css.backdrop-filter.enabled");
+ }
+ }
+};
+
+/* static */
+nsCSSPropsGfxVarReceiver nsCSSPropsGfxVarReceiver::sInstance =
+ nsCSSPropsGfxVarReceiver();
+
+/* static */
+bool nsCSSPropsGfxVarReceiver::sLastKnownUseWebRender = false;
+
+/* static */
+gfx::gfxVarReceiver& nsCSSProps::GfxVarReceiver() {
+ return nsCSSPropsGfxVarReceiver::GetInstance();
+}
+
+#include "nsCSSPropsGenerated.inc"
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 11:42:30 +0000