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df34135583
This was needed when backdrop-filter-enabledness depended on WebRender-enabledness, but now it's available everywhere. Depends on D130027 Differential Revision: https://phabricator.services.mozilla.com/D130028
241 lines
8.6 KiB
C++
241 lines
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* methods for dealing with CSS properties and tables of the keyword
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* values they accept
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*/
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#ifndef nsCSSProps_h___
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#define nsCSSProps_h___
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#include <limits>
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#include <ostream>
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#include <type_traits>
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#include "nsString.h"
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#include "nsCSSPropertyID.h"
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#include "nsStyleStructFwd.h"
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#include "mozilla/UseCounter.h"
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#include "mozilla/CSSEnabledState.h"
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#include "mozilla/CSSPropFlags.h"
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#include "mozilla/EnumTypeTraits.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/gfx/gfxVarReceiver.h"
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#include "nsXULAppAPI.h"
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// Length of the "--" prefix on custom names (such as custom property names,
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// and, in the future, custom media query names).
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#define CSS_CUSTOM_NAME_PREFIX_LENGTH 2
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namespace mozilla {
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class ComputedStyle;
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}
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extern "C" {
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nsCSSPropertyID Servo_ResolveLogicalProperty(nsCSSPropertyID,
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const mozilla::ComputedStyle*);
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nsCSSPropertyID Servo_Property_LookupEnabledForAllContent(const nsACString*);
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const uint8_t* Servo_Property_GetName(nsCSSPropertyID, uint32_t* aLength);
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}
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class nsCSSProps {
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public:
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typedef mozilla::CSSEnabledState EnabledState;
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typedef mozilla::CSSPropFlags Flags;
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static void AddRefTable(void);
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static void ReleaseTable(void);
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// Looks up the property with name aProperty and returns its corresponding
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// nsCSSPropertyID value. If aProperty is the name of a custom property,
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// then eCSSPropertyExtra_variable will be returned.
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//
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// This only returns properties enabled for all content, and resolves aliases
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// to return the aliased property.
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static nsCSSPropertyID LookupProperty(const nsACString& aProperty) {
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return Servo_Property_LookupEnabledForAllContent(&aProperty);
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}
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// As above, but looked up using a property's IDL name.
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// eCSSPropertyExtra_variable won't be returned from this method.
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static nsCSSPropertyID LookupPropertyByIDLName(
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const nsACString& aPropertyIDLName, EnabledState aEnabled);
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// Returns whether aProperty is a custom property name, i.e. begins with
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// "--". This assumes that the CSS Variables pref has been enabled.
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static bool IsCustomPropertyName(const nsACString& aProperty);
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static bool IsShorthand(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
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"out of range");
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return (aProperty >= eCSSProperty_COUNT_no_shorthands);
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}
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// Same but for @font-face descriptors
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static nsCSSFontDesc LookupFontDesc(const nsACString& aProperty);
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// The relevant invariants are asserted in Document.cpp
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static mozilla::UseCounter UseCounterFor(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_with_aliases,
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"out of range");
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return mozilla::UseCounter(size_t(mozilla::eUseCounter_FirstCSSProperty) +
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size_t(aProperty));
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}
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// Given a property enum, get the string value
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//
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// This string is static.
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static const nsDependentCSubstring GetStringValue(nsCSSPropertyID aProperty) {
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uint32_t len;
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const uint8_t* chars = Servo_Property_GetName(aProperty, &len);
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return nsDependentCSubstring(reinterpret_cast<const char*>(chars), len);
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}
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static const nsCString& GetStringValue(nsCSSFontDesc aFontDesc);
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static const nsCString& GetStringValue(nsCSSCounterDesc aCounterDesc);
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private:
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static const Flags kFlagsTable[eCSSProperty_COUNT];
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public:
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static bool PropHasFlags(nsCSSPropertyID aProperty, Flags aFlags) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
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"out of range");
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return (nsCSSProps::kFlagsTable[aProperty] & aFlags) == aFlags;
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}
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static nsCSSPropertyID Physicalize(nsCSSPropertyID aProperty,
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const mozilla::ComputedStyle& aStyle) {
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MOZ_ASSERT(!IsShorthand(aProperty));
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if (PropHasFlags(aProperty, Flags::IsLogical)) {
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return Servo_ResolveLogicalProperty(aProperty, &aStyle);
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}
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return aProperty;
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}
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private:
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// A table for shorthand properties. The appropriate index is the
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// property ID minus eCSSProperty_COUNT_no_shorthands.
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static const nsCSSPropertyID* const
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kSubpropertyTable[eCSSProperty_COUNT - eCSSProperty_COUNT_no_shorthands];
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public:
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/**
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* Recoumputes the enabled state of a pref. If aPrefName is nullptr,
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* recomputes the state of all prefs in gPropertyEnabled.
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* aClosure is the pref callback closure data, which is not used.
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*/
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static void RecomputeEnabledState(const char* aPrefName,
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void* aClosure = nullptr);
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/**
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* Retrieve a singleton receiver to register with gfxVars
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*/
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static mozilla::gfx::gfxVarReceiver& GfxVarReceiver();
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static const nsCSSPropertyID* SubpropertyEntryFor(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(eCSSProperty_COUNT_no_shorthands <= aProperty &&
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aProperty < eCSSProperty_COUNT,
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"out of range");
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return nsCSSProps::kSubpropertyTable[aProperty -
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eCSSProperty_COUNT_no_shorthands];
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}
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private:
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static bool gPropertyEnabled[eCSSProperty_COUNT_with_aliases];
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private:
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// Defined in the generated nsCSSPropsGenerated.inc.
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static const char* const kIDLNameTable[eCSSProperty_COUNT];
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public:
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/**
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* Returns the IDL name of the specified property, which must be a
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* longhand, logical or shorthand property. The IDL name is the property
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* name with any hyphen-lowercase character pairs replaced by an
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* uppercase character:
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* https://drafts.csswg.org/cssom/#css-property-to-idl-attribute
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*
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* As a special case, the string "cssFloat" is returned for the float
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* property. nullptr is returned for internal properties.
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*/
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static const char* PropertyIDLName(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
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"out of range");
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return kIDLNameTable[aProperty];
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}
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private:
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static const int32_t kIDLNameSortPositionTable[eCSSProperty_COUNT];
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public:
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/**
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* Returns the position of the specified property in a list of all
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* properties sorted by their IDL name.
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*/
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static int32_t PropertyIDLNameSortPosition(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
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"out of range");
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return kIDLNameSortPositionTable[aProperty];
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}
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static bool IsEnabled(nsCSSPropertyID aProperty) {
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MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_with_aliases,
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"out of range");
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// In the child process, assert that we're not trying to parse stylesheets
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// before we've gotten all our prefs.
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MOZ_ASSERT_IF(!XRE_IsParentProcess(),
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mozilla::Preferences::ArePrefsInitedInContentProcess());
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return gPropertyEnabled[aProperty];
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}
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public:
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static bool IsEnabled(nsCSSPropertyID aProperty, EnabledState aEnabled) {
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if (IsEnabled(aProperty)) {
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return true;
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}
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if (aEnabled == EnabledState::IgnoreEnabledState) {
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return true;
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}
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if ((aEnabled & EnabledState::InUASheets) &&
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PropHasFlags(aProperty, Flags::EnabledInUASheets)) {
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return true;
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}
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if ((aEnabled & EnabledState::InChrome) &&
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PropHasFlags(aProperty, Flags::EnabledInChrome)) {
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return true;
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}
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return false;
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}
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public:
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struct PropertyPref {
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nsCSSPropertyID mPropID;
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const char* mPref;
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};
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static const PropertyPref kPropertyPrefTable[];
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// Storing the enabledstate_ value in an nsCSSPropertyID variable is a small
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// hack to avoid needing a separate variable declaration for its real type
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// (CSSEnabledState), which would then require using a block and
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// therefore a pair of macros by consumers for the start and end of the loop.
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#define CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(it_, prop_, enabledstate_) \
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for (const nsCSSPropertyID * \
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it_ = nsCSSProps::SubpropertyEntryFor(prop_), \
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es_ = (nsCSSPropertyID)((enabledstate_) | CSSEnabledState(0)); \
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*it_ != eCSSProperty_UNKNOWN; ++it_) \
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if (nsCSSProps::IsEnabled(*it_, (mozilla::CSSEnabledState)es_))
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};
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// MOZ_DBG support for nsCSSPropertyID
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inline std::ostream& operator<<(std::ostream& aOut, nsCSSPropertyID aProperty) {
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return aOut << nsCSSProps::GetStringValue(aProperty);
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}
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#endif /* nsCSSProps_h___ */
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