layout/style/GeckoBindings.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* FFI functions for Servo to call into Gecko */
   8
   9 #ifndef mozilla_GeckoBindings_h
  10 #define mozilla_GeckoBindings_h
  11
  12 #include <stdint.h>
  13
  14 #include "mozilla/ServoTypes.h"
  15 #include "mozilla/ServoBindingTypes.h"
  16 #include "mozilla/css/DocumentMatchingFunction.h"
  17 #include "mozilla/css/SheetLoadData.h"
  18 #include "mozilla/dom/Document.h"
  19 #include "mozilla/EffectCompositor.h"
  20 #include "mozilla/PreferenceSheet.h"
  21 #include "nsStyleStruct.h"
  22 #include "COLRFonts.h"
  23
  24 class nsAtom;
  25 class nsIURI;
  26 class nsSimpleContentList;
  27 struct nsFont;
  28 class ServoComputedData;
  29
  30 namespace mozilla {
  31 class ComputedStyle;
  32 class SeenPtrs;
  33 class ServoElementSnapshot;
  34 class ServoElementSnapshotTable;
  35 class StyleSheet;
  36 enum class PseudoStyleType : uint8_t;
  37 enum class PointerCapabilities : uint8_t;
  38 enum class UpdateAnimationsTasks : uint8_t;
  39 struct Keyframe;
  40 struct StyleStylesheetContents;
  41
  42 namespace css {
  43 class LoaderReusableStyleSheets;
  44 }
  45 namespace dom {
  46 enum class CompositeOperationOrAuto : uint8_t;
  47 enum class ScreenColorGamut : uint8_t;
  48 }  // namespace dom
  49 }  // namespace mozilla
  50
  51 #ifdef NIGHTLY_BUILD
  52 const bool GECKO_IS_NIGHTLY = true;
  53 #else
  54 const bool GECKO_IS_NIGHTLY = false;
  55 #endif
  56
  57 #define NS_DECL_THREADSAFE_FFI_REFCOUNTING(class_, name_)  \
  58   void Gecko_AddRef##name_##ArbitraryThread(class_* aPtr); \
  59   void Gecko_Release##name_##ArbitraryThread(class_* aPtr);
  60 #define NS_IMPL_THREADSAFE_FFI_REFCOUNTING(class_, name_)                      \
  61   static_assert(class_::HasThreadSafeRefCnt::value,                            \
  62                 "NS_DECL_THREADSAFE_FFI_REFCOUNTING can only be used with "    \
  63                 "classes that have thread-safe refcounting");                  \
  64   void Gecko_AddRef##name_##ArbitraryThread(class_* aPtr) { NS_ADDREF(aPtr); } \
  65   void Gecko_Release##name_##ArbitraryThread(class_* aPtr) { NS_RELEASE(aPtr); }
  66
  67 extern "C" {
  68
  69 NS_DECL_THREADSAFE_FFI_REFCOUNTING(nsIURI, nsIURI);
  70
  71 // Debugging stuff.
  72 void Gecko_Element_DebugListAttributes(const mozilla::dom::Element*,
  73                                        nsCString*);
  74
  75 void Gecko_Snapshot_DebugListAttributes(const mozilla::ServoElementSnapshot*,
  76                                         nsCString*);
  77
  78 bool Gecko_IsSignificantChild(const nsINode*, bool whitespace_is_significant);
  79
  80 const nsINode* Gecko_GetLastChild(const nsINode*);
  81 const nsINode* Gecko_GetFlattenedTreeParentNode(const nsINode*);
  82 const mozilla::dom::Element* Gecko_GetBeforeOrAfterPseudo(
  83     const mozilla::dom::Element*, bool is_before);
  84 const mozilla::dom::Element* Gecko_GetMarkerPseudo(
  85     const mozilla::dom::Element*);
  86
  87 nsTArray<nsIContent*>* Gecko_GetAnonymousContentForElement(
  88     const mozilla::dom::Element*);
  89 void Gecko_DestroyAnonymousContentList(nsTArray<nsIContent*>* anon_content);
  90
  91 const nsTArray<RefPtr<nsINode>>* Gecko_GetAssignedNodes(
  92     const mozilla::dom::Element*);
  93
  94 void Gecko_GetQueryContainerSize(const mozilla::dom::Element*,
  95                                  nscoord* aOutWidth, nscoord* aOutHeight);
  96
  97 void Gecko_ComputedStyle_Init(mozilla::ComputedStyle* context,
  98                               const ServoComputedData* values,
  99                               mozilla::PseudoStyleType pseudo_type);
 100
 101 void Gecko_ComputedStyle_Destroy(mozilla::ComputedStyle* context);
 102
 103 // By default, Servo walks the DOM by traversing the siblings of the DOM-view
 104 // first child. This generally works, but misses anonymous children, which we
 105 // want to traverse during styling. To support these cases, we create an
 106 // optional stack-allocated iterator in aIterator for nodes that need it.
 107 void Gecko_ConstructStyleChildrenIterator(const mozilla::dom::Element*,
 108                                           mozilla::dom::StyleChildrenIterator*);
 109
 110 void Gecko_DestroyStyleChildrenIterator(mozilla::dom::StyleChildrenIterator*);
 111
 112 const nsINode* Gecko_GetNextStyleChild(mozilla::dom::StyleChildrenIterator*);
 113
 114 nsAtom* Gecko_Element_ImportedPart(const nsAttrValue*, nsAtom*);
 115 nsAtom** Gecko_Element_ExportedParts(const nsAttrValue*, nsAtom*,
 116                                      size_t* aOutLength);
 117
 118 NS_DECL_THREADSAFE_FFI_REFCOUNTING(mozilla::css::SheetLoadDataHolder,
 119                                    SheetLoadDataHolder);
 120
 121 void Gecko_StyleSheet_FinishAsyncParse(
 122     mozilla::css::SheetLoadDataHolder* data,
 123     mozilla::StyleStrong<mozilla::StyleStylesheetContents> sheet_contents,
 124     mozilla::StyleUseCounters* use_counters);
 125
 126 mozilla::StyleSheet* Gecko_LoadStyleSheet(
 127     mozilla::css::Loader* loader, mozilla::StyleSheet* parent,
 128     mozilla::css::SheetLoadData* parent_load_data,
 129     mozilla::css::LoaderReusableStyleSheets* reusable_sheets,
 130     const mozilla::StyleCssUrl* url,
 131     mozilla::StyleStrong<mozilla::StyleLockedMediaList> media_list);
 132
 133 void Gecko_LoadStyleSheetAsync(
 134     mozilla::css::SheetLoadDataHolder* parent_data,
 135     const mozilla::StyleCssUrl* url,
 136     mozilla::StyleStrong<mozilla::StyleLockedMediaList>,
 137     mozilla::StyleStrong<mozilla::StyleLockedImportRule>);
 138
 139 // Selector Matching.
 140 uint64_t Gecko_ElementState(const mozilla::dom::Element*);
 141 bool Gecko_IsRootElement(const mozilla::dom::Element*);
 142
 143 bool Gecko_MatchLang(const mozilla::dom::Element*, nsAtom* override_lang,
 144                      bool has_override_lang, const char16_t* value);
 145
 146 nsAtom* Gecko_GetXMLLangValue(const mozilla::dom::Element*);
 147
 148 const mozilla::PreferenceSheet::Prefs* Gecko_GetPrefSheetPrefs(
 149     const mozilla::dom::Document*);
 150
 151 bool Gecko_IsTableBorderNonzero(const mozilla::dom::Element* element);
 152 bool Gecko_IsSelectListBox(const mozilla::dom::Element* element);
 153
 154 // Attributes.
 155 #define SERVO_DECLARE_ELEMENT_ATTR_MATCHING_FUNCTIONS(prefix_, implementor_) \
 156   nsAtom* prefix_##LangValue(implementor_ element);
 157
 158 bool Gecko_AttrEquals(const nsAttrValue*, const nsAtom*, bool aIgnoreCase);
 159 bool Gecko_AttrDashEquals(const nsAttrValue*, const nsAtom*, bool aIgnoreCase);
 160 bool Gecko_AttrIncludes(const nsAttrValue*, const nsAtom*, bool aIgnoreCase);
 161 bool Gecko_AttrHasSubstring(const nsAttrValue*, const nsAtom*,
 162                             bool aIgnoreCase);
 163 bool Gecko_AttrHasPrefix(const nsAttrValue*, const nsAtom*, bool aIgnoreCase);
 164 bool Gecko_AttrHasSuffix(const nsAttrValue*, const nsAtom*, bool aIgnoreCase);
 165
 166 bool Gecko_AssertClassAttrValueIsSane(const nsAttrValue*);
 167 const nsAttrValue* Gecko_GetSVGAnimatedClass(const mozilla::dom::Element*);
 168
 169 SERVO_DECLARE_ELEMENT_ATTR_MATCHING_FUNCTIONS(Gecko_,
 170                                               const mozilla::dom::Element*)
 171
 172 SERVO_DECLARE_ELEMENT_ATTR_MATCHING_FUNCTIONS(
 173     Gecko_Snapshot, const mozilla::ServoElementSnapshot*)
 174
 175 #undef SERVO_DECLARE_ELEMENT_ATTR_MATCHING_FUNCTIONS
 176
 177 // Style attributes.
 178 const mozilla::StyleLockedDeclarationBlock* Gecko_GetStyleAttrDeclarationBlock(
 179     const mozilla::dom::Element* element);
 180
 181 void Gecko_UnsetDirtyStyleAttr(const mozilla::dom::Element* element);
 182
 183 const mozilla::StyleLockedDeclarationBlock*
 184 Gecko_GetHTMLPresentationAttrDeclarationBlock(
 185     const mozilla::dom::Element* element);
 186
 187 const mozilla::StyleLockedDeclarationBlock*
 188 Gecko_GetExtraContentStyleDeclarations(const mozilla::dom::Element* element);
 189
 190 const mozilla::StyleLockedDeclarationBlock*
 191 Gecko_GetUnvisitedLinkAttrDeclarationBlock(
 192     const mozilla::dom::Element* element);
 193
 194 const mozilla::StyleLockedDeclarationBlock*
 195 Gecko_GetVisitedLinkAttrDeclarationBlock(const mozilla::dom::Element* element);
 196
 197 const mozilla::StyleLockedDeclarationBlock*
 198 Gecko_GetActiveLinkAttrDeclarationBlock(const mozilla::dom::Element* element);
 199
 200 // Visited handling.
 201
 202 // Returns whether visited styles are enabled for a given document.
 203 bool Gecko_VisitedStylesEnabled(const mozilla::dom::Document*);
 204
 205 // Animations
 206 bool Gecko_GetAnimationRule(
 207     const mozilla::dom::Element* aElementOrPseudo,
 208     mozilla::EffectCompositor::CascadeLevel aCascadeLevel,
 209     mozilla::StyleAnimationValueMap* aAnimationValues);
 210
 211 bool Gecko_StyleAnimationsEquals(
 212     const nsStyleAutoArray<mozilla::StyleAnimation>*,
 213     const nsStyleAutoArray<mozilla::StyleAnimation>*);
 214
 215 bool Gecko_StyleScrollTimelinesEquals(
 216     const nsStyleAutoArray<mozilla::StyleScrollTimeline>*,
 217     const nsStyleAutoArray<mozilla::StyleScrollTimeline>*);
 218
 219 bool Gecko_StyleViewTimelinesEquals(
 220     const nsStyleAutoArray<mozilla::StyleViewTimeline>*,
 221     const nsStyleAutoArray<mozilla::StyleViewTimeline>*);
 222
 223 void Gecko_UpdateAnimations(const mozilla::dom::Element* aElementOrPseudo,
 224                             const mozilla::ComputedStyle* aOldComputedValues,
 225                             const mozilla::ComputedStyle* aComputedValues,
 226                             mozilla::UpdateAnimationsTasks aTasks);
 227
 228 size_t Gecko_GetAnimationEffectCount(
 229     const mozilla::dom::Element* aElementOrPseudo);
 230 bool Gecko_ElementHasAnimations(const mozilla::dom::Element* aElementOrPseudo);
 231 bool Gecko_ElementHasCSSAnimations(
 232     const mozilla::dom::Element* aElementOrPseudo);
 233 bool Gecko_ElementHasCSSTransitions(
 234     const mozilla::dom::Element* aElementOrPseudo);
 235 bool Gecko_ElementHasWebAnimations(
 236     const mozilla::dom::Element* aElementOrPseudo);
 237 size_t Gecko_ElementTransitions_Length(
 238     const mozilla::dom::Element* aElementOrPseudo);
 239
 240 nsCSSPropertyID Gecko_ElementTransitions_PropertyAt(
 241     const mozilla::dom::Element* aElementOrPseudo, size_t aIndex);
 242
 243 const mozilla::StyleAnimationValue* Gecko_ElementTransitions_EndValueAt(
 244     const mozilla::dom::Element* aElementOrPseudo, size_t aIndex);
 245
 246 double Gecko_GetProgressFromComputedTiming(const mozilla::ComputedTiming*);
 247
 248 double Gecko_GetPositionInSegment(const mozilla::AnimationPropertySegment*,
 249                                   double aProgress, bool aBeforeFlag);
 250
 251 // Get servo's AnimationValue for |aProperty| from the cached base style
 252 // |aBaseStyles|.
 253 // |aBaseStyles| is nsRefPtrHashtable<nsGenericHashKey<AnimatedPropertyID>,
 254 // StyleAnimationValue>.
 255 // We use RawServoAnimationValueTableBorrowed to avoid exposing
 256 // nsRefPtrHashtable in FFI.
 257 const mozilla::StyleAnimationValue* Gecko_AnimationGetBaseStyle(
 258     const RawServoAnimationValueTable* aBaseStyles,
 259     const mozilla::AnimatedPropertyID* aProperty);
 260
 261 void Gecko_StyleTransition_SetUnsupportedProperty(
 262     mozilla::StyleTransition* aTransition, nsAtom* aAtom);
 263
 264 // Atoms.
 265 nsAtom* Gecko_Atomize(const char* aString, uint32_t aLength);
 266 nsAtom* Gecko_Atomize16(const nsAString* aString);
 267 void Gecko_AddRefAtom(nsAtom* aAtom);
 268 void Gecko_ReleaseAtom(nsAtom* aAtom);
 269
 270 // will not run destructors on dst, give it uninitialized memory
 271 // font_id is LookAndFeel::FontID
 272 void Gecko_nsFont_InitSystem(nsFont* dst, mozilla::StyleSystemFont font_id,
 273                              const nsStyleFont* font,
 274                              const mozilla::dom::Document*);
 275
 276 void Gecko_nsFont_Destroy(nsFont* dst);
 277
 278 // The gfxFontFeatureValueSet returned from this function has zero reference.
 279 gfxFontFeatureValueSet* Gecko_ConstructFontFeatureValueSet();
 280
 281 nsTArray<uint32_t>* Gecko_AppendFeatureValueHashEntry(
 282     gfxFontFeatureValueSet* value_set, nsAtom* family, uint32_t alternate,
 283     nsAtom* name);
 284
 285 // Font variant alternates
 286 void Gecko_ClearAlternateValues(nsFont* font, size_t length);
 287
 288 void Gecko_AppendAlternateValues(nsFont* font, uint32_t alternate_name,
 289                                  nsAtom* atom);
 290
 291 void Gecko_CopyAlternateValuesFrom(nsFont* dest, const nsFont* src);
 292
 293 // The FontPaletteValueSet returned from this function has zero reference.
 294 mozilla::gfx::FontPaletteValueSet* Gecko_ConstructFontPaletteValueSet();
 295
 296 mozilla::gfx::FontPaletteValueSet::PaletteValues*
 297 Gecko_AppendPaletteValueHashEntry(
 298     mozilla::gfx::FontPaletteValueSet* aPaletteValueSet, nsAtom* aFamily,
 299     nsAtom* aName);
 300
 301 void Gecko_SetFontPaletteBase(
 302     mozilla::gfx::FontPaletteValueSet::PaletteValues* aValues,
 303     int32_t aBasePaletteIndex);
 304
 305 void Gecko_SetFontPaletteOverride(
 306     mozilla::gfx::FontPaletteValueSet::PaletteValues* aValues, int32_t aIndex,
 307     mozilla::StyleAbsoluteColor* aColor);
 308
 309 // Visibility style
 310 void Gecko_SetImageOrientation(nsStyleVisibility* aVisibility,
 311                                uint8_t aOrientation, bool aFlip);
 312
 313 void Gecko_SetImageOrientationAsFromImage(nsStyleVisibility* aVisibility);
 314
 315 void Gecko_CopyImageOrientationFrom(nsStyleVisibility* aDst,
 316                                     const nsStyleVisibility* aSrc);
 317
 318 // list-style-image style.
 319 void Gecko_SetListStyleImageNone(nsStyleList* style_struct);
 320
 321 void Gecko_SetListStyleImageImageValue(
 322     nsStyleList* style_struct, const mozilla::StyleComputedImageUrl* url);
 323
 324 void Gecko_CopyListStyleImageFrom(nsStyleList* dest, const nsStyleList* src);
 325
 326 // Dirtiness tracking.
 327 void Gecko_NoteDirtyElement(const mozilla::dom::Element*);
 328 void Gecko_NoteDirtySubtreeForInvalidation(const mozilla::dom::Element*);
 329 void Gecko_NoteAnimationOnlyDirtyElement(const mozilla::dom::Element*);
 330
 331 bool Gecko_AnimationNameMayBeReferencedFromStyle(const nsPresContext*,
 332                                                  nsAtom* name);
 333
 334 float Gecko_GetScrollbarInlineSize(const nsPresContext*);
 335
 336 // Incremental restyle.
 337 mozilla::PseudoStyleType Gecko_GetImplementedPseudo(
 338     const mozilla::dom::Element*);
 339
 340 // We'd like to return `nsChangeHint` here, but bindgen bitfield enums don't
 341 // work as return values with the Linux 32-bit ABI at the moment because
 342 // they wrap the value in a struct.
 343 uint32_t Gecko_CalcStyleDifference(const mozilla::ComputedStyle* old_style,
 344                                    const mozilla::ComputedStyle* new_style,
 345                                    bool* any_style_struct_changed,
 346                                    bool* reset_only_changed);
 347
 348 nscoord Gecko_CalcLineHeight(const mozilla::StyleLineHeight*,
 349                              const nsPresContext*, bool aVertical,
 350                              const nsStyleFont* aAgainstFont,
 351                              const mozilla::dom::Element* aElement);
 352
 353 // Get an element snapshot for a given element from the table.
 354 const mozilla::ServoElementSnapshot* Gecko_GetElementSnapshot(
 355     const mozilla::ServoElementSnapshotTable* table,
 356     const mozilla::dom::Element*);
 357
 358 // Have we seen this pointer before?
 359 bool Gecko_HaveSeenPtr(mozilla::SeenPtrs* table, const void* ptr);
 360
 361 void Gecko_EnsureImageLayersLength(nsStyleImageLayers* layers, size_t len,
 362                                    nsStyleImageLayers::LayerType layer_type);
 363
 364 void Gecko_EnsureStyleAnimationArrayLength(void* array, size_t len);
 365 void Gecko_EnsureStyleTransitionArrayLength(void* array, size_t len);
 366 void Gecko_EnsureStyleScrollTimelineArrayLength(void* array, size_t len);
 367 void Gecko_EnsureStyleViewTimelineArrayLength(void* array, size_t len);
 368
 369 // Searches from the beginning of |keyframes| for a Keyframe object with the
 370 // specified offset and timing function. If none is found, a new Keyframe object
 371 // with the specified |offset| and |timingFunction| will be prepended to
 372 // |keyframes|.
 373 //
 374 // @param keyframes  An array of Keyframe objects, sorted by offset.
 375 //                   The first Keyframe in the array, if any, MUST have an
 376 //                   offset greater than or equal to |offset|.
 377 // @param offset  The offset to search for, or, if no suitable Keyframe is
 378 //                found, the offset to use for the created Keyframe.
 379 //                Must be a floating point number in the range [0.0, 1.0].
 380 // @param timingFunction  The timing function to match, or, if no suitable
 381 //                        Keyframe is found, to set on the created Keyframe.
 382 // @param composition  The composition to match, or, if no suitable Keyframe is
 383 //                     found, to set on the created Keyframe.
 384 //
 385 // @returns  The matching or created Keyframe.
 386 mozilla::Keyframe* Gecko_GetOrCreateKeyframeAtStart(
 387     nsTArray<mozilla::Keyframe>* keyframes, float offset,
 388     const mozilla::StyleComputedTimingFunction* timingFunction,
 389     const mozilla::dom::CompositeOperationOrAuto composition);
 390
 391 // As with Gecko_GetOrCreateKeyframeAtStart except that this method will search
 392 // from the beginning of |keyframes| for a Keyframe with matching timing
 393 // function, composition, and an offset of 0.0.
 394 // Furthermore, if a matching Keyframe is not found, a new Keyframe will be
 395 // inserted after the *last* Keyframe in |keyframes| with offset 0.0.
 396 mozilla::Keyframe* Gecko_GetOrCreateInitialKeyframe(
 397     nsTArray<mozilla::Keyframe>* keyframes,
 398     const mozilla::StyleComputedTimingFunction* timingFunction,
 399     const mozilla::dom::CompositeOperationOrAuto composition);
 400
 401 // As with Gecko_GetOrCreateKeyframeAtStart except that this method will search
 402 // from the *end* of |keyframes| for a Keyframe with matching timing function,
 403 // composition, and an offset of 1.0. If a matching Keyframe is not found, a new
 404 // Keyframe will be appended to the end of |keyframes|.
 405 mozilla::Keyframe* Gecko_GetOrCreateFinalKeyframe(
 406     nsTArray<mozilla::Keyframe>* keyframes,
 407     const mozilla::StyleComputedTimingFunction* timingFunction,
 408     const mozilla::dom::CompositeOperationOrAuto composition);
 409
 410 void Gecko_ResetFilters(nsStyleEffects* effects, size_t new_len);
 411
 412 void Gecko_CopyFiltersFrom(nsStyleEffects* aSrc, nsStyleEffects* aDest);
 413
 414 void Gecko_nsStyleSVG_SetDashArrayLength(nsStyleSVG* svg, uint32_t len);
 415
 416 void Gecko_nsStyleSVG_CopyDashArray(nsStyleSVG* dst, const nsStyleSVG* src);
 417
 418 void Gecko_nsStyleSVG_SetContextPropertiesLength(nsStyleSVG* svg, uint32_t len);
 419
 420 void Gecko_nsStyleSVG_CopyContextProperties(nsStyleSVG* dst,
 421                                             const nsStyleSVG* src);
 422
 423 void Gecko_GetComputedURLSpec(const mozilla::StyleComputedUrl* url,
 424                               nsCString* spec);
 425
 426 void Gecko_GetComputedImageURLSpec(const mozilla::StyleComputedUrl* url,
 427                                    nsCString* spec);
 428
 429 // Return true if the given image MIME type is supported
 430 bool Gecko_IsSupportedImageMimeType(const uint8_t* mime_type,
 431                                     const uint32_t len);
 432
 433 void Gecko_nsIURI_Debug(nsIURI*, nsCString* spec);
 434
 435 void Gecko_nsIReferrerInfo_Debug(nsIReferrerInfo* aReferrerInfo,
 436                                  nsCString* aOut);
 437
 438 NS_DECL_THREADSAFE_FFI_REFCOUNTING(mozilla::URLExtraData, URLExtraData);
 439 NS_DECL_THREADSAFE_FFI_REFCOUNTING(nsIReferrerInfo, nsIReferrerInfo);
 440
 441 void Gecko_FillAllImageLayers(nsStyleImageLayers* layers, uint32_t max_len);
 442
 443 void Gecko_LoadData_Drop(mozilla::StyleLoadData*);
 444
 445 void Gecko_nsStyleFont_SetLang(nsStyleFont* font, nsAtom* atom);
 446
 447 void Gecko_nsStyleFont_CopyLangFrom(nsStyleFont* aFont,
 448                                     const nsStyleFont* aSource);
 449
 450 mozilla::Length Gecko_nsStyleFont_ComputeMinSize(const nsStyleFont*,
 451                                                  const mozilla::dom::Document*);
 452
 453 // Computes the default generic font for a language.
 454 mozilla::StyleGenericFontFamily
 455 Gecko_nsStyleFont_ComputeFallbackFontTypeForLanguage(
 456     const mozilla::dom::Document*, nsAtom* language);
 457
 458 mozilla::Length Gecko_GetBaseSize(const mozilla::dom::Document*,
 459                                   nsAtom* language,
 460                                   mozilla::StyleGenericFontFamily);
 461
 462 struct GeckoFontMetrics {
 463   mozilla::Length mXSize;
 464   mozilla::Length mChSize;     // negatives indicate not found.
 465   mozilla::Length mCapHeight;  // negatives indicate not found.
 466   mozilla::Length mIcWidth;    // negatives indicate not found.
 467   mozilla::Length mAscent;
 468   mozilla::Length mComputedEmSize;
 469   float mScriptPercentScaleDown;        // zero is invalid or means not found.
 470   float mScriptScriptPercentScaleDown;  // zero is invalid or means not found.
 471 };
 472
 473 GeckoFontMetrics Gecko_GetFontMetrics(const nsPresContext*, bool is_vertical,
 474                                       const nsStyleFont* font,
 475                                       mozilla::Length font_size,
 476                                       bool use_user_font_set,
 477                                       bool retrieve_math_scales);
 478
 479 mozilla::StyleSheet* Gecko_StyleSheet_Clone(
 480     const mozilla::StyleSheet* aSheet,
 481     const mozilla::StyleSheet* aNewParentSheet);
 482
 483 void Gecko_StyleSheet_AddRef(const mozilla::StyleSheet* aSheet);
 484 void Gecko_StyleSheet_Release(const mozilla::StyleSheet* aSheet);
 485
 486 struct GeckoImplicitScopeRoot {
 487   const mozilla::dom::Element* mHost;
 488   const mozilla::dom::Element* mRoot;
 489   bool mConstructed;
 490 };
 491 GeckoImplicitScopeRoot Gecko_StyleSheet_ImplicitScopeRoot(
 492     const mozilla::StyleSheet* aSheet);
 493
 494 bool Gecko_IsDocumentBody(const mozilla::dom::Element* element);
 495
 496 bool Gecko_IsDarkColorScheme(const mozilla::dom::Document*,
 497                              const mozilla::StyleColorScheme*);
 498 nscolor Gecko_ComputeSystemColor(mozilla::StyleSystemColor,
 499                                  const mozilla::dom::Document*,
 500                                  const mozilla::StyleColorScheme*);
 501
 502 // We use an int32_t here instead of a LookAndFeel::IntID/FloatID because
 503 // forward-declaring a nested enum/struct is impossible.
 504 int32_t Gecko_GetLookAndFeelInt(int32_t int_id);
 505 float Gecko_GetLookAndFeelFloat(int32_t float_id);
 506
 507 void Gecko_AddPropertyToSet(nsCSSPropertyIDSet*, nsCSSPropertyID);
 508
 509 // Style-struct management.
 510 #define STYLE_STRUCT(name)                                                   \
 511   void Gecko_Construct_Default_nsStyle##name(nsStyle##name* ptr,             \
 512                                              const mozilla::dom::Document*); \
 513   void Gecko_CopyConstruct_nsStyle##name(nsStyle##name* ptr,                 \
 514                                          const nsStyle##name* other);        \
 515   void Gecko_Destroy_nsStyle##name(nsStyle##name* ptr);
 516 #include "nsStyleStructList.h"
 517 #undef STYLE_STRUCT
 518
 519 bool Gecko_DocumentRule_UseForPresentation(
 520     const mozilla::dom::Document*, const nsACString* aPattern,
 521     mozilla::css::DocumentMatchingFunction);
 522
 523 // Allocator hinting.
 524 void Gecko_SetJemallocThreadLocalArena(bool enabled);
 525
 526 // Pseudo-element flags.
 527 #define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
 528   const uint32_t SERVO_CSS_PSEUDO_ELEMENT_FLAGS_##name_ = flags_;
 529 #include "nsCSSPseudoElementList.h"
 530 #undef CSS_PSEUDO_ELEMENT
 531
 532 bool Gecko_ErrorReportingEnabled(const mozilla::StyleSheet* sheet,
 533                                  const mozilla::css::Loader* loader,
 534                                  uint64_t* aOutWindowId);
 535
 536 void Gecko_ReportUnexpectedCSSError(
 537     uint64_t windowId, nsIURI* uri, const char* message, const char* param,
 538     uint32_t paramLen, const char* prefix, const char* prefixParam,
 539     uint32_t prefixParamLen, const char* suffix, const char* source,
 540     uint32_t sourceLen, const char* selectors, uint32_t selectorsLen,
 541     uint32_t lineNumber, uint32_t colNumber);
 542
 543 // DOM APIs.
 544 void Gecko_ContentList_AppendAll(nsSimpleContentList* aContentList,
 545                                  const mozilla::dom::Element** aElements,
 546                                  size_t aLength);
 547
 548 // FIXME(emilio): These two below should be a single function that takes a
 549 // `const DocumentOrShadowRoot*`, but that doesn't make MSVC builds happy for a
 550 // reason I haven't really dug into.
 551 const nsTArray<mozilla::dom::Element*>* Gecko_Document_GetElementsWithId(
 552     const mozilla::dom::Document*, nsAtom* aId);
 553
 554 const nsTArray<mozilla::dom::Element*>* Gecko_ShadowRoot_GetElementsWithId(
 555     const mozilla::dom::ShadowRoot*, nsAtom* aId);
 556
 557 bool Gecko_ComputeBoolPrefMediaQuery(nsAtom*);
 558
 559 // Check whether font format/tech is supported.
 560 bool Gecko_IsFontFormatSupported(
 561     mozilla::StyleFontFaceSourceFormatKeyword aFormat);
 562 bool Gecko_IsFontTechSupported(mozilla::StyleFontFaceSourceTechFlags aFlag);
 563
 564 bool Gecko_IsKnownIconFontFamily(const nsAtom* aFamilyName);
 565
 566 // Returns true if we're currently performing the servo traversal.
 567 bool Gecko_IsInServoTraversal();
 568
 569 // Returns true if we're currently on the main thread.
 570 bool Gecko_IsMainThread();
 571
 572 // Returns true if we're currently on a DOM worker thread.
 573 bool Gecko_IsDOMWorkerThread();
 574
 575 // Returns the preferred number of style threads to use, or -1 for no
 576 // preference.
 577 int32_t Gecko_GetNumStyleThreads();
 578
 579 // Media feature helpers.
 580 //
 581 // Defined in nsMediaFeatures.cpp.
 582 mozilla::StyleDisplayMode Gecko_MediaFeatures_GetDisplayMode(
 583     const mozilla::dom::Document*);
 584
 585 bool Gecko_MediaFeatures_UseOverlayScrollbars(const mozilla::dom::Document*);
 586 int32_t Gecko_MediaFeatures_GetColorDepth(const mozilla::dom::Document*);
 587 int32_t Gecko_MediaFeatures_GetMonochromeBitsPerPixel(
 588     const mozilla::dom::Document*);
 589 mozilla::dom::ScreenColorGamut Gecko_MediaFeatures_ColorGamut(
 590     const mozilla::dom::Document*);
 591
 592 void Gecko_MediaFeatures_GetDeviceSize(const mozilla::dom::Document*,
 593                                        nscoord* width, nscoord* height);
 594
 595 float Gecko_MediaFeatures_GetResolution(const mozilla::dom::Document*);
 596 bool Gecko_MediaFeatures_PrefersReducedMotion(const mozilla::dom::Document*);
 597 bool Gecko_MediaFeatures_PrefersReducedTransparency(
 598     const mozilla::dom::Document*);
 599 mozilla::StylePrefersContrast Gecko_MediaFeatures_PrefersContrast(
 600     const mozilla::dom::Document*);
 601 mozilla::StylePrefersColorScheme Gecko_MediaFeatures_PrefersColorScheme(
 602     const mozilla::dom::Document*, bool aUseContent);
 603 bool Gecko_MediaFeatures_InvertedColors(const mozilla::dom::Document*);
 604 mozilla::StyleScripting Gecko_MediaFeatures_Scripting(
 605     const mozilla::dom::Document*);
 606
 607 mozilla::StyleDynamicRange Gecko_MediaFeatures_DynamicRange(
 608     const mozilla::dom::Document*);
 609 mozilla::StyleDynamicRange Gecko_MediaFeatures_VideoDynamicRange(
 610     const mozilla::dom::Document*);
 611
 612 mozilla::PointerCapabilities Gecko_MediaFeatures_PrimaryPointerCapabilities(
 613     const mozilla::dom::Document*);
 614
 615 mozilla::PointerCapabilities Gecko_MediaFeatures_AllPointerCapabilities(
 616     const mozilla::dom::Document*);
 617
 618 float Gecko_MediaFeatures_GetDevicePixelRatio(const mozilla::dom::Document*);
 619
 620 bool Gecko_MediaFeatures_IsResourceDocument(const mozilla::dom::Document*);
 621 bool Gecko_MediaFeatures_MatchesPlatform(mozilla::StylePlatform);
 622 mozilla::StyleGtkThemeFamily Gecko_MediaFeatures_GtkThemeFamily();
 623
 624 void Gecko_GetSafeAreaInsets(const nsPresContext*, float*, float*, float*,
 625                              float*);
 626
 627 void Gecko_PrintfStderr(const nsCString*);
 628
 629 }  // extern "C"
 630
 631 #endif  // mozilla_GeckoBindings_h