widget/Theme.cpp

   1 /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "Theme.h"
   7 #include <utility>
   8 #include "ThemeCocoa.h"
   9
  10 #include "ThemeDrawing.h"
  11 #include "Units.h"
  12 #include "mozilla/MathAlgorithms.h"
  13 #include "mozilla/ClearOnShutdown.h"
  14 #include "mozilla/dom/Document.h"
  15 #include "mozilla/dom/HTMLMeterElement.h"
  16 #include "mozilla/dom/HTMLProgressElement.h"
  17 #include "mozilla/gfx/Rect.h"
  18 #include "mozilla/gfx/Types.h"
  19 #include "mozilla/gfx/Filters.h"
  20 #include "mozilla/RelativeLuminanceUtils.h"
  21 #include "mozilla/StaticPrefs_widget.h"
  22 #include "mozilla/webrender/WebRenderAPI.h"
  23 #include "nsCSSColorUtils.h"
  24 #include "nsCSSRendering.h"
  25 #include "nsScrollbarFrame.h"
  26 #include "nsIScrollableFrame.h"
  27 #include "nsIScrollbarMediator.h"
  28 #include "nsDeviceContext.h"
  29 #include "nsLayoutUtils.h"
  30 #include "nsRangeFrame.h"
  31 #include "PathHelpers.h"
  32 #include "ScrollbarDrawingAndroid.h"
  33 #include "ScrollbarDrawingCocoa.h"
  34 #include "ScrollbarDrawingGTK.h"
  35 #include "ScrollbarDrawingWin.h"
  36 #include "ScrollbarDrawingWin11.h"
  37
  38 #ifdef XP_WIN
  39 #  include "mozilla/WindowsVersion.h"
  40 #endif
  41
  42 using namespace mozilla;
  43 using namespace mozilla::dom;
  44 using namespace mozilla::gfx;
  45 using namespace mozilla::widget;
  46
  47 namespace {
  48
  49 static constexpr gfx::sRGBColor sColorGrey10(
  50     gfx::sRGBColor::UnusualFromARGB(0xffe9e9ed));
  51 static constexpr gfx::sRGBColor sColorGrey10Alpha50(
  52     gfx::sRGBColor::UnusualFromARGB(0x7fe9e9ed));
  53 static constexpr gfx::sRGBColor sColorGrey20(
  54     gfx::sRGBColor::UnusualFromARGB(0xffd0d0d7));
  55 static constexpr gfx::sRGBColor sColorGrey30(
  56     gfx::sRGBColor::UnusualFromARGB(0xffb1b1b9));
  57 static constexpr gfx::sRGBColor sColorGrey40(
  58     gfx::sRGBColor::UnusualFromARGB(0xff8f8f9d));
  59 static constexpr gfx::sRGBColor sColorGrey40Alpha50(
  60     gfx::sRGBColor::UnusualFromARGB(0x7f8f8f9d));
  61 static constexpr gfx::sRGBColor sColorGrey50(
  62     gfx::sRGBColor::UnusualFromARGB(0xff676774));
  63 static constexpr gfx::sRGBColor sColorGrey60(
  64     gfx::sRGBColor::UnusualFromARGB(0xff484851));
  65
  66 static constexpr gfx::sRGBColor sColorMeterGreen10(
  67     gfx::sRGBColor::UnusualFromARGB(0xff00ab60));
  68 static constexpr gfx::sRGBColor sColorMeterGreen20(
  69     gfx::sRGBColor::UnusualFromARGB(0xff056139));
  70 static constexpr gfx::sRGBColor sColorMeterYellow10(
  71     gfx::sRGBColor::UnusualFromARGB(0xffffbd4f));
  72 static constexpr gfx::sRGBColor sColorMeterYellow20(
  73     gfx::sRGBColor::UnusualFromARGB(0xffd2811e));
  74 static constexpr gfx::sRGBColor sColorMeterRed10(
  75     gfx::sRGBColor::UnusualFromARGB(0xffe22850));
  76 static constexpr gfx::sRGBColor sColorMeterRed20(
  77     gfx::sRGBColor::UnusualFromARGB(0xff810220));
  78
  79 static const CSSCoord kMinimumRangeThumbSize = 20.0f;
  80 static const CSSCoord kMinimumDropdownArrowButtonWidth = 18.0f;
  81 static const CSSCoord kMinimumSpinnerButtonWidth = 18.0f;
  82 static const CSSCoord kMinimumSpinnerButtonHeight = 9.0f;
  83 static const CSSCoord kButtonBorderWidth = 1.0f;
  84 static const CSSCoord kMenulistBorderWidth = 1.0f;
  85 static const CSSCoord kTextFieldBorderWidth = 1.0f;
  86 static const CSSCoord kRangeHeight = 6.0f;
  87 static const CSSCoord kProgressbarHeight = 6.0f;
  88 static const CSSCoord kMeterHeight = 12.0f;
  89
  90 // nsCheckboxRadioFrame takes the bottom of the content box as the baseline.
  91 // This border-width makes its baseline 2px under the bottom, which is nice.
  92 static constexpr CSSCoord kCheckboxRadioBorderWidth = 2.0f;
  93
  94 static constexpr sRGBColor sTransparent = sRGBColor::White(0.0);
  95
  96 // This pushes and pops a clip rect to the draw target.
  97 //
  98 // This is done to reduce fuzz in places where we may have antialiasing,
  99 // because skia is not clip-invariant: given different clips, it does not
 100 // guarantee the same result, even if the painted content doesn't intersect
 101 // the clips.
 102 //
 103 // This is a bit sad, overall, but...
 104 struct MOZ_RAII AutoClipRect {
 105   AutoClipRect(DrawTarget& aDt, const LayoutDeviceRect& aRect) : mDt(aDt) {
 106     mDt.PushClipRect(aRect.ToUnknownRect());
 107   }
 108
 109   ~AutoClipRect() { mDt.PopClip(); }
 110
 111  private:
 112   DrawTarget& mDt;
 113 };
 114
 115 static StaticRefPtr<Theme> gNativeInstance;
 116 static StaticRefPtr<Theme> gNonNativeInstance;
 117 static StaticRefPtr<Theme> gRDMInstance;
 118
 119 }  // namespace
 120
 121 #ifdef ANDROID
 122 already_AddRefed<Theme> do_CreateNativeThemeDoNotUseDirectly() {
 123   // Android doesn't have a native theme.
 124   return do_AddRef(new Theme(Theme::ScrollbarStyle()));
 125 }
 126 #endif
 127
 128 already_AddRefed<nsITheme> do_GetBasicNativeThemeDoNotUseDirectly() {
 129   if (MOZ_UNLIKELY(!gNonNativeInstance)) {
 130     UniquePtr<ScrollbarDrawing> scrollbarDrawing = Theme::ScrollbarStyle();
 131 #ifdef MOZ_WIDGET_COCOA
 132     gNonNativeInstance = new ThemeCocoa(std::move(scrollbarDrawing));
 133 #else
 134     gNonNativeInstance = new Theme(std::move(scrollbarDrawing));
 135 #endif
 136     ClearOnShutdown(&gNonNativeInstance);
 137   }
 138   return do_AddRef(gNonNativeInstance);
 139 }
 140
 141 already_AddRefed<nsITheme> do_GetNativeThemeDoNotUseDirectly() {
 142   if (MOZ_UNLIKELY(!gNativeInstance)) {
 143     gNativeInstance = do_CreateNativeThemeDoNotUseDirectly();
 144     ClearOnShutdown(&gNativeInstance);
 145   }
 146   return do_AddRef(gNativeInstance);
 147 }
 148
 149 already_AddRefed<nsITheme> do_GetRDMThemeDoNotUseDirectly() {
 150   if (MOZ_UNLIKELY(!gRDMInstance)) {
 151     gRDMInstance = new Theme(MakeUnique<ScrollbarDrawingAndroid>());
 152     ClearOnShutdown(&gRDMInstance);
 153   }
 154   return do_AddRef(gRDMInstance);
 155 }
 156
 157 namespace mozilla::widget {
 158
 159 NS_IMPL_ISUPPORTS_INHERITED(Theme, nsNativeTheme, nsITheme)
 160
 161 static constexpr nsLiteralCString kPrefs[] = {
 162     "widget.non-native-theme.use-theme-accent"_ns,
 163     "widget.non-native-theme.win.scrollbar.use-system-size"_ns,
 164     "widget.non-native-theme.scrollbar.size.override"_ns,
 165     "widget.non-native-theme.scrollbar.style"_ns,
 166 };
 167
 168 void Theme::Init() {
 169   for (const auto& pref : kPrefs) {
 170     Preferences::RegisterCallback(PrefChangedCallback, pref);
 171   }
 172   LookAndFeelChanged();
 173 }
 174
 175 void Theme::Shutdown() {
 176   for (const auto& pref : kPrefs) {
 177     Preferences::UnregisterCallback(PrefChangedCallback, pref);
 178   }
 179 }
 180
 181 /* static */
 182 void Theme::LookAndFeelChanged() {
 183   ThemeColors::RecomputeAccentColors();
 184   if (gNonNativeInstance) {
 185     gNonNativeInstance->SetScrollbarDrawing(ScrollbarStyle());
 186   }
 187   if (gNativeInstance) {
 188     gNativeInstance->SetScrollbarDrawing(ScrollbarStyle());
 189   }
 190 }
 191
 192 auto Theme::GetDPIRatio(nsPresContext* aPc, StyleAppearance aAppearance)
 193     -> DPIRatio {
 194   // Widgets react to zoom, except scrollbars.
 195   if (IsWidgetScrollbarPart(aAppearance)) {
 196     return GetScrollbarDrawing().GetDPIRatioForScrollbarPart(aPc);
 197   }
 198   return DPIRatio(float(AppUnitsPerCSSPixel()) / aPc->AppUnitsPerDevPixel());
 199 }
 200
 201 auto Theme::GetDPIRatio(nsIFrame* aFrame, StyleAppearance aAppearance)
 202     -> DPIRatio {
 203   return GetDPIRatio(aFrame->PresContext(), aAppearance);
 204 }
 205
 206 // Checkbox and radio need to preserve aspect-ratio for compat. We also snap the
 207 // size to exact device pixels to avoid snapping disorting the circles.
 208 static LayoutDeviceRect CheckBoxRadioRect(const LayoutDeviceRect& aRect) {
 209   // Place a square rect in the center of aRect.
 210   auto size = std::trunc(std::min(aRect.width, aRect.height));
 211   auto position = aRect.Center() - LayoutDevicePoint(size * 0.5, size * 0.5);
 212   return LayoutDeviceRect(position, LayoutDeviceSize(size, size));
 213 }
 214
 215 std::tuple<sRGBColor, sRGBColor, sRGBColor> Theme::ComputeCheckboxColors(
 216     const ElementState& aState, StyleAppearance aAppearance,
 217     const Colors& aColors) {
 218   MOZ_ASSERT(aAppearance == StyleAppearance::Checkbox ||
 219              aAppearance == StyleAppearance::Radio);
 220
 221   bool isDisabled = aState.HasState(ElementState::DISABLED);
 222   bool isChecked = aState.HasState(ElementState::CHECKED);
 223   bool isIndeterminate = aAppearance == StyleAppearance::Checkbox &&
 224                          aState.HasState(ElementState::INDETERMINATE);
 225
 226   if (isChecked || isIndeterminate) {
 227     if (isDisabled) {
 228       auto bg = ComputeBorderColor(aState, aColors, OutlineCoversBorder::No);
 229       auto fg = aColors.HighContrast()
 230                     ? aColors.System(StyleSystemColor::Graytext)
 231                     : sRGBColor::White(aColors.IsDark() ? .4f : .8f);
 232       return std::make_tuple(bg, bg, fg);
 233     }
 234
 235     if (aColors.HighContrast()) {
 236       auto bg = aColors.System(StyleSystemColor::Selecteditem);
 237       auto fg = aColors.System(StyleSystemColor::Selecteditemtext);
 238       return std::make_tuple(bg, bg, fg);
 239     }
 240
 241     bool isActive =
 242         aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 243     bool isHovered = aState.HasState(ElementState::HOVER);
 244     const auto& bg = isActive    ? aColors.Accent().GetDarker()
 245                      : isHovered ? aColors.Accent().GetDark()
 246                                  : aColors.Accent().Get();
 247     const auto& fg = aColors.Accent().GetForeground();
 248     return std::make_tuple(bg, bg, fg);
 249   }
 250
 251   auto [bg, border] =
 252       ComputeTextfieldColors(aState, aColors, OutlineCoversBorder::No);
 253   // We don't paint a checkmark in this case so any color would do.
 254   return std::make_tuple(bg, border, sTransparent);
 255 }
 256
 257 sRGBColor Theme::ComputeBorderColor(const ElementState& aState,
 258                                     const Colors& aColors,
 259                                     OutlineCoversBorder aOutlineCoversBorder) {
 260   bool isDisabled = aState.HasState(ElementState::DISABLED);
 261   if (aColors.HighContrast()) {
 262     return aColors.System(isDisabled ? StyleSystemColor::Graytext
 263                                      : StyleSystemColor::Buttontext);
 264   }
 265   bool isActive =
 266       aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 267   bool isHovered = aState.HasState(ElementState::HOVER);
 268   bool isFocused = aState.HasState(ElementState::FOCUSRING);
 269   if (isDisabled) {
 270     return sColorGrey40Alpha50;
 271   }
 272   if (isFocused && aOutlineCoversBorder == OutlineCoversBorder::Yes) {
 273     // If we draw the outline over the border, prevent issues where the border
 274     // shows underneath if it snaps in the wrong direction by using a
 275     // transparent border. An alternative to this is ensuring that we snap the
 276     // offset in PaintRoundedFocusRect the same was a we snap border widths, so
 277     // that negative offsets are guaranteed to cover the border.
 278     // But this looks harder to mess up.
 279     return sTransparent;
 280   }
 281   bool dark = aColors.IsDark();
 282   if (isActive) {
 283     return dark ? sColorGrey20 : sColorGrey60;
 284   }
 285   if (isHovered) {
 286     return dark ? sColorGrey30 : sColorGrey50;
 287   }
 288   return sColorGrey40;
 289 }
 290
 291 std::pair<sRGBColor, sRGBColor> Theme::ComputeButtonColors(
 292     const ElementState& aState, const Colors& aColors, nsIFrame* aFrame) {
 293   bool isActive =
 294       aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 295   bool isDisabled = aState.HasState(ElementState::DISABLED);
 296   bool isHovered = aState.HasState(ElementState::HOVER);
 297
 298   nscolor backgroundColor = [&] {
 299     if (isDisabled) {
 300       return aColors.SystemNs(StyleSystemColor::MozButtondisabledface);
 301     }
 302     if (isActive) {
 303       return aColors.SystemNs(StyleSystemColor::MozButtonactiveface);
 304     }
 305     if (isHovered) {
 306       return aColors.SystemNs(StyleSystemColor::MozButtonhoverface);
 307     }
 308     return aColors.SystemNs(StyleSystemColor::Buttonface);
 309   }();
 310
 311   if (aState.HasState(ElementState::AUTOFILL)) {
 312     backgroundColor = NS_ComposeColors(
 313         backgroundColor,
 314         aColors.SystemNs(StyleSystemColor::MozAutofillBackground));
 315   }
 316
 317   const sRGBColor borderColor =
 318       ComputeBorderColor(aState, aColors, OutlineCoversBorder::Yes);
 319   return std::make_pair(sRGBColor::FromABGR(backgroundColor), borderColor);
 320 }
 321
 322 std::pair<sRGBColor, sRGBColor> Theme::ComputeTextfieldColors(
 323     const ElementState& aState, const Colors& aColors,
 324     OutlineCoversBorder aOutlineCoversBorder) {
 325   nscolor backgroundColor = [&] {
 326     if (aState.HasState(ElementState::DISABLED)) {
 327       return aColors.SystemNs(StyleSystemColor::MozDisabledfield);
 328     }
 329     return aColors.SystemNs(StyleSystemColor::Field);
 330   }();
 331
 332   if (aState.HasState(ElementState::AUTOFILL)) {
 333     backgroundColor = NS_ComposeColors(
 334         backgroundColor,
 335         aColors.SystemNs(StyleSystemColor::MozAutofillBackground));
 336   }
 337
 338   const sRGBColor borderColor =
 339       ComputeBorderColor(aState, aColors, aOutlineCoversBorder);
 340   return std::make_pair(sRGBColor::FromABGR(backgroundColor), borderColor);
 341 }
 342
 343 std::pair<sRGBColor, sRGBColor> Theme::ComputeRangeProgressColors(
 344     const ElementState& aState, const Colors& aColors) {
 345   if (aColors.HighContrast()) {
 346     return aColors.SystemPair(StyleSystemColor::Selecteditem,
 347                               StyleSystemColor::Buttontext);
 348   }
 349
 350   bool isActive =
 351       aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 352   bool isDisabled = aState.HasState(ElementState::DISABLED);
 353   bool isHovered = aState.HasState(ElementState::HOVER);
 354
 355   if (isDisabled) {
 356     return std::make_pair(sColorGrey40Alpha50, sColorGrey40Alpha50);
 357   }
 358   if (isActive || isHovered) {
 359     return std::make_pair(aColors.Accent().GetDark(),
 360                           aColors.Accent().GetDarker());
 361   }
 362   return std::make_pair(aColors.Accent().Get(), aColors.Accent().GetDark());
 363 }
 364
 365 std::pair<sRGBColor, sRGBColor> Theme::ComputeRangeTrackColors(
 366     const ElementState& aState, const Colors& aColors) {
 367   if (aColors.HighContrast()) {
 368     return aColors.SystemPair(StyleSystemColor::Window,
 369                               StyleSystemColor::Buttontext);
 370   }
 371   bool isActive =
 372       aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 373   bool isDisabled = aState.HasState(ElementState::DISABLED);
 374   bool isHovered = aState.HasState(ElementState::HOVER);
 375
 376   if (isDisabled) {
 377     return std::make_pair(sColorGrey10Alpha50, sColorGrey40Alpha50);
 378   }
 379   if (isActive || isHovered) {
 380     return std::make_pair(sColorGrey20, sColorGrey50);
 381   }
 382   return std::make_pair(sColorGrey10, sColorGrey40);
 383 }
 384
 385 std::pair<sRGBColor, sRGBColor> Theme::ComputeRangeThumbColors(
 386     const ElementState& aState, const Colors& aColors) {
 387   if (aColors.HighContrast()) {
 388     return aColors.SystemPair(StyleSystemColor::Selecteditemtext,
 389                               StyleSystemColor::Selecteditem);
 390   }
 391
 392   bool isActive =
 393       aState.HasAllStates(ElementState::HOVER | ElementState::ACTIVE);
 394   bool isDisabled = aState.HasState(ElementState::DISABLED);
 395   bool isHovered = aState.HasState(ElementState::HOVER);
 396
 397   const sRGBColor& backgroundColor = [&] {
 398     if (isDisabled) {
 399       return sColorGrey40;
 400     }
 401     if (isActive) {
 402       return aColors.Accent().Get();
 403     }
 404     if (isHovered) {
 405       return sColorGrey60;
 406     }
 407     return sColorGrey50;
 408   }();
 409
 410   const sRGBColor borderColor = sRGBColor::OpaqueWhite();
 411   return std::make_pair(backgroundColor, borderColor);
 412 }
 413
 414 std::pair<sRGBColor, sRGBColor> Theme::ComputeProgressColors(
 415     const Colors& aColors) {
 416   if (aColors.HighContrast()) {
 417     return aColors.SystemPair(StyleSystemColor::Selecteditem,
 418                               StyleSystemColor::Buttontext);
 419   }
 420   return std::make_pair(aColors.Accent().Get(), aColors.Accent().GetDark());
 421 }
 422
 423 std::pair<sRGBColor, sRGBColor> Theme::ComputeProgressTrackColors(
 424     const Colors& aColors) {
 425   if (aColors.HighContrast()) {
 426     return aColors.SystemPair(StyleSystemColor::Buttonface,
 427                               StyleSystemColor::Buttontext);
 428   }
 429   return std::make_pair(sColorGrey10, sColorGrey40);
 430 }
 431
 432 std::pair<sRGBColor, sRGBColor> Theme::ComputeMeterchunkColors(
 433     const ElementState& aMeterState, const Colors& aColors) {
 434   if (aColors.HighContrast()) {
 435     return ComputeProgressColors(aColors);
 436   }
 437   sRGBColor borderColor = sColorMeterGreen20;
 438   sRGBColor chunkColor = sColorMeterGreen10;
 439
 440   if (aMeterState.HasState(ElementState::SUB_OPTIMUM)) {
 441     borderColor = sColorMeterYellow20;
 442     chunkColor = sColorMeterYellow10;
 443   } else if (aMeterState.HasState(ElementState::SUB_SUB_OPTIMUM)) {
 444     borderColor = sColorMeterRed20;
 445     chunkColor = sColorMeterRed10;
 446   }
 447
 448   return std::make_pair(chunkColor, borderColor);
 449 }
 450
 451 std::array<sRGBColor, 3> Theme::ComputeFocusRectColors(const Colors& aColors) {
 452   if (aColors.HighContrast()) {
 453     return {aColors.System(StyleSystemColor::Selecteditem),
 454             aColors.System(StyleSystemColor::Buttontext),
 455             aColors.System(StyleSystemColor::Window)};
 456   }
 457   const auto& accent = aColors.Accent();
 458   const sRGBColor middle =
 459       aColors.IsDark() ? sRGBColor::Black(.3f) : sRGBColor::White(.3f);
 460   return {accent.Get(), middle, accent.GetLight()};
 461 }
 462
 463 template <typename PaintBackendData>
 464 void Theme::PaintRoundedFocusRect(PaintBackendData& aBackendData,
 465                                   const LayoutDeviceRect& aRect,
 466                                   const Colors& aColors, DPIRatio aDpiRatio,
 467                                   CSSCoord aRadius, CSSCoord aOffset) {
 468   // NOTE(emilio): If the widths or offsets here change, make sure to tweak
 469   // the GetWidgetOverflow path for FocusOutline.
 470   auto [innerColor, middleColor, outerColor] = ComputeFocusRectColors(aColors);
 471
 472   LayoutDeviceRect focusRect(aRect);
 473
 474   // The focus rect is painted outside of the border area (aRect), see:
 475   //
 476   //   data:text/html,<div style="border: 1px solid; outline: 2px solid
 477   //   red">Foobar</div>
 478   //
 479   // But some controls might provide a negative offset to cover the border, if
 480   // necessary.
 481   CSSCoord strokeWidth = 2.0f;
 482   auto strokeWidthDevPx =
 483       LayoutDeviceCoord(ThemeDrawing::SnapBorderWidth(strokeWidth, aDpiRatio));
 484   CSSCoord strokeRadius = aRadius;
 485   focusRect.Inflate(aOffset * aDpiRatio + strokeWidthDevPx);
 486
 487   ThemeDrawing::PaintRoundedRectWithRadius(
 488       aBackendData, focusRect, sTransparent, innerColor, strokeWidth,
 489       strokeRadius, aDpiRatio);
 490
 491   strokeWidth = CSSCoord(1.0f);
 492   strokeWidthDevPx =
 493       LayoutDeviceCoord(ThemeDrawing::SnapBorderWidth(strokeWidth, aDpiRatio));
 494   strokeRadius += strokeWidth;
 495   focusRect.Inflate(strokeWidthDevPx);
 496
 497   ThemeDrawing::PaintRoundedRectWithRadius(
 498       aBackendData, focusRect, sTransparent, middleColor, strokeWidth,
 499       strokeRadius, aDpiRatio);
 500
 501   strokeWidth = CSSCoord(2.0f);
 502   strokeWidthDevPx =
 503       LayoutDeviceCoord(ThemeDrawing::SnapBorderWidth(strokeWidth, aDpiRatio));
 504   strokeRadius += strokeWidth;
 505   focusRect.Inflate(strokeWidthDevPx);
 506
 507   ThemeDrawing::PaintRoundedRectWithRadius(
 508       aBackendData, focusRect, sTransparent, outerColor, strokeWidth,
 509       strokeRadius, aDpiRatio);
 510 }
 511
 512 void Theme::PaintCheckboxControl(DrawTarget& aDrawTarget,
 513                                  const LayoutDeviceRect& aRect,
 514                                  const ElementState& aState,
 515                                  const Colors& aColors, DPIRatio aDpiRatio) {
 516   auto [backgroundColor, borderColor, checkColor] =
 517       ComputeCheckboxColors(aState, StyleAppearance::Checkbox, aColors);
 518   {
 519     const CSSCoord radius = 2.0f;
 520     CSSCoord borderWidth = kCheckboxRadioBorderWidth;
 521     if (backgroundColor == borderColor) {
 522       borderWidth = 0.0f;
 523     }
 524     ThemeDrawing::PaintRoundedRectWithRadius(aDrawTarget, aRect,
 525                                              backgroundColor, borderColor,
 526                                              borderWidth, radius, aDpiRatio);
 527   }
 528
 529   if (aState.HasState(ElementState::INDETERMINATE)) {
 530     PaintIndeterminateMark(aDrawTarget, aRect, checkColor);
 531   } else if (aState.HasState(ElementState::CHECKED)) {
 532     PaintCheckMark(aDrawTarget, aRect, checkColor);
 533   }
 534
 535   if (aState.HasState(ElementState::FOCUSRING)) {
 536     PaintRoundedFocusRect(aDrawTarget, aRect, aColors, aDpiRatio, 5.0f, 1.0f);
 537   }
 538 }
 539
 540 constexpr CSSCoord kCheckboxRadioContentBoxSize = 10.0f;
 541 constexpr CSSCoord kCheckboxRadioBorderBoxSize =
 542     kCheckboxRadioContentBoxSize + kCheckboxRadioBorderWidth * 2.0f;
 543
 544 void Theme::PaintCheckMark(DrawTarget& aDrawTarget,
 545                            const LayoutDeviceRect& aRect,
 546                            const sRGBColor& aColor) {
 547   // Points come from the coordinates on a 14X14 (kCheckboxRadioBorderBoxSize)
 548   // unit box centered at 0,0
 549   const float checkPolygonX[] = {-4.5f, -1.5f, -0.5f, 5.0f, 4.75f,
 550                                  3.5f,  -0.5f, -1.5f, -3.5f};
 551   const float checkPolygonY[] = {0.5f,  4.0f, 4.0f,  -2.5f, -4.0f,
 552                                  -4.0f, 1.0f, 1.25f, -1.0f};
 553   const int32_t checkNumPoints = sizeof(checkPolygonX) / sizeof(float);
 554   const float scale =
 555       ThemeDrawing::ScaleToFillRect(aRect, kCheckboxRadioBorderBoxSize);
 556   auto center = aRect.Center().ToUnknownPoint();
 557
 558   RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
 559   Point p = center + Point(checkPolygonX[0] * scale, checkPolygonY[0] * scale);
 560   builder->MoveTo(p);
 561   for (int32_t i = 1; i < checkNumPoints; i++) {
 562     p = center + Point(checkPolygonX[i] * scale, checkPolygonY[i] * scale);
 563     builder->LineTo(p);
 564   }
 565   RefPtr<Path> path = builder->Finish();
 566
 567   aDrawTarget.Fill(path, ColorPattern(ToDeviceColor(aColor)));
 568 }
 569
 570 void Theme::PaintIndeterminateMark(DrawTarget& aDrawTarget,
 571                                    const LayoutDeviceRect& aRect,
 572                                    const sRGBColor& aColor) {
 573   const CSSCoord borderWidth = 2.0f;
 574   const float scale =
 575       ThemeDrawing::ScaleToFillRect(aRect, kCheckboxRadioBorderBoxSize);
 576
 577   Rect rect = aRect.ToUnknownRect();
 578   rect.y += (rect.height / 2) - (borderWidth * scale / 2);
 579   rect.height = borderWidth * scale;
 580   rect.x += (borderWidth * scale) + (borderWidth * scale / 8);
 581   rect.width -= ((borderWidth * scale) + (borderWidth * scale / 8)) * 2;
 582
 583   aDrawTarget.FillRect(rect, ColorPattern(ToDeviceColor(aColor)));
 584 }
 585
 586 template <typename PaintBackendData>
 587 void Theme::PaintStrokedCircle(PaintBackendData& aPaintData,
 588                                const LayoutDeviceRect& aRect,
 589                                const sRGBColor& aBackgroundColor,
 590                                const sRGBColor& aBorderColor,
 591                                const CSSCoord aBorderWidth,
 592                                DPIRatio aDpiRatio) {
 593   auto radius = LayoutDeviceCoord(aRect.Size().width) / aDpiRatio;
 594   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, aRect, aBackgroundColor,
 595                                            aBorderColor, aBorderWidth, radius,
 596                                            aDpiRatio);
 597 }
 598
 599 void Theme::PaintCircleShadow(WebRenderBackendData& aWrData,
 600                               const LayoutDeviceRect& aBoxRect,
 601                               const LayoutDeviceRect& aClipRect,
 602                               float aShadowAlpha, const CSSPoint& aShadowOffset,
 603                               CSSCoord aShadowBlurStdDev, DPIRatio aDpiRatio) {
 604   const bool kBackfaceIsVisible = true;
 605   const LayoutDeviceCoord stdDev = aShadowBlurStdDev * aDpiRatio;
 606   const LayoutDevicePoint shadowOffset = aShadowOffset * aDpiRatio;
 607   const IntSize inflation =
 608       gfxAlphaBoxBlur::CalculateBlurRadius(gfxPoint(stdDev, stdDev));
 609   LayoutDeviceRect shadowRect = aBoxRect;
 610   shadowRect.MoveBy(shadowOffset);
 611   shadowRect.Inflate(inflation.width, inflation.height);
 612   const auto boxRect = wr::ToLayoutRect(aBoxRect);
 613   aWrData.mBuilder.PushBoxShadow(
 614       wr::ToLayoutRect(shadowRect), wr::ToLayoutRect(aClipRect),
 615       kBackfaceIsVisible, boxRect,
 616       wr::ToLayoutVector2D(aShadowOffset * aDpiRatio),
 617       wr::ToColorF(DeviceColor(0.0f, 0.0f, 0.0f, aShadowAlpha)), stdDev,
 618       /* aSpread = */ 0.0f,
 619       wr::ToBorderRadius(gfx::RectCornerRadii(aBoxRect.Size().width)),
 620       wr::BoxShadowClipMode::Outset);
 621 }
 622
 623 void Theme::PaintCircleShadow(DrawTarget& aDrawTarget,
 624                               const LayoutDeviceRect& aBoxRect,
 625                               const LayoutDeviceRect& aClipRect,
 626                               float aShadowAlpha, const CSSPoint& aShadowOffset,
 627                               CSSCoord aShadowBlurStdDev, DPIRatio aDpiRatio) {
 628   Float stdDev = aShadowBlurStdDev * aDpiRatio;
 629   Point offset = (aShadowOffset * aDpiRatio).ToUnknownPoint();
 630
 631   RefPtr<FilterNode> blurFilter =
 632       aDrawTarget.CreateFilter(FilterType::GAUSSIAN_BLUR);
 633   if (!blurFilter) {
 634     return;
 635   }
 636
 637   blurFilter->SetAttribute(ATT_GAUSSIAN_BLUR_STD_DEVIATION, stdDev);
 638
 639   IntSize inflation =
 640       gfxAlphaBoxBlur::CalculateBlurRadius(gfxPoint(stdDev, stdDev));
 641   Rect inflatedRect = aBoxRect.ToUnknownRect();
 642   inflatedRect.Inflate(inflation.width, inflation.height);
 643   Rect sourceRectInFilterSpace =
 644       inflatedRect - aBoxRect.TopLeft().ToUnknownPoint();
 645   Point destinationPointOfSourceRect = inflatedRect.TopLeft() + offset;
 646
 647   IntSize dtSize = RoundedToInt(aBoxRect.Size().ToUnknownSize());
 648   RefPtr<DrawTarget> ellipseDT = aDrawTarget.CreateSimilarDrawTargetForFilter(
 649       dtSize, SurfaceFormat::A8, blurFilter, blurFilter,
 650       sourceRectInFilterSpace, destinationPointOfSourceRect);
 651   if (!ellipseDT) {
 652     return;
 653   }
 654
 655   AutoClipRect clipRect(aDrawTarget, aClipRect);
 656
 657   RefPtr<Path> ellipse = MakePathForEllipse(
 658       *ellipseDT, (aBoxRect - aBoxRect.TopLeft()).Center().ToUnknownPoint(),
 659       aBoxRect.Size().ToUnknownSize());
 660   ellipseDT->Fill(ellipse,
 661                   ColorPattern(DeviceColor(0.0f, 0.0f, 0.0f, aShadowAlpha)));
 662   RefPtr<SourceSurface> ellipseSurface = ellipseDT->Snapshot();
 663
 664   blurFilter->SetInput(IN_GAUSSIAN_BLUR_IN, ellipseSurface);
 665   aDrawTarget.DrawFilter(blurFilter, sourceRectInFilterSpace,
 666                          destinationPointOfSourceRect);
 667 }
 668
 669 template <typename PaintBackendData>
 670 void Theme::PaintRadioControl(PaintBackendData& aPaintData,
 671                               const LayoutDeviceRect& aRect,
 672                               const ElementState& aState, const Colors& aColors,
 673                               DPIRatio aDpiRatio) {
 674   auto [backgroundColor, borderColor, checkColor] =
 675       ComputeCheckboxColors(aState, StyleAppearance::Radio, aColors);
 676   {
 677     CSSCoord borderWidth = kCheckboxRadioBorderWidth;
 678     if (backgroundColor == borderColor) {
 679       borderWidth = 0.0f;
 680     }
 681     PaintStrokedCircle(aPaintData, aRect, backgroundColor, borderColor,
 682                        borderWidth, aDpiRatio);
 683   }
 684
 685   if (aState.HasState(ElementState::CHECKED)) {
 686     LayoutDeviceRect rect(aRect);
 687     auto width = LayoutDeviceCoord(
 688         ThemeDrawing::SnapBorderWidth(kCheckboxRadioBorderWidth, aDpiRatio));
 689     rect.Deflate(width);
 690
 691     PaintStrokedCircle(aPaintData, rect, backgroundColor, checkColor,
 692                        kCheckboxRadioBorderWidth, aDpiRatio);
 693   }
 694
 695   if (aState.HasState(ElementState::FOCUSRING)) {
 696     PaintRoundedFocusRect(aPaintData, aRect, aColors, aDpiRatio, 5.0f, 1.0f);
 697   }
 698 }
 699
 700 template <typename PaintBackendData>
 701 void Theme::PaintTextField(PaintBackendData& aPaintData,
 702                            const LayoutDeviceRect& aRect,
 703                            const ElementState& aState, const Colors& aColors,
 704                            DPIRatio aDpiRatio) {
 705   auto [backgroundColor, borderColor] =
 706       ComputeTextfieldColors(aState, aColors, OutlineCoversBorder::Yes);
 707
 708   const CSSCoord radius = 2.0f;
 709
 710   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, aRect, backgroundColor,
 711                                            borderColor, kTextFieldBorderWidth,
 712                                            radius, aDpiRatio);
 713
 714   if (aState.HasState(ElementState::FOCUSRING)) {
 715     PaintRoundedFocusRect(aPaintData, aRect, aColors, aDpiRatio,
 716                           radius + kTextFieldBorderWidth,
 717                           -kTextFieldBorderWidth);
 718   }
 719 }
 720
 721 template <typename PaintBackendData>
 722 void Theme::PaintListbox(PaintBackendData& aPaintData,
 723                          const LayoutDeviceRect& aRect,
 724                          const ElementState& aState, const Colors& aColors,
 725                          DPIRatio aDpiRatio) {
 726   const CSSCoord radius = 2.0f;
 727   auto [backgroundColor, borderColor] =
 728       ComputeTextfieldColors(aState, aColors, OutlineCoversBorder::Yes);
 729
 730   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, aRect, backgroundColor,
 731                                            borderColor, kMenulistBorderWidth,
 732                                            radius, aDpiRatio);
 733
 734   if (aState.HasState(ElementState::FOCUSRING)) {
 735     PaintRoundedFocusRect(aPaintData, aRect, aColors, aDpiRatio,
 736                           radius + kMenulistBorderWidth, -kMenulistBorderWidth);
 737   }
 738 }
 739
 740 template <typename PaintBackendData>
 741 void Theme::PaintMenulist(PaintBackendData& aDrawTarget,
 742                           const LayoutDeviceRect& aRect,
 743                           const ElementState& aState, const Colors& aColors,
 744                           DPIRatio aDpiRatio) {
 745   const CSSCoord radius = 4.0f;
 746   auto [backgroundColor, borderColor] = ComputeButtonColors(aState, aColors);
 747
 748   ThemeDrawing::PaintRoundedRectWithRadius(aDrawTarget, aRect, backgroundColor,
 749                                            borderColor, kMenulistBorderWidth,
 750                                            radius, aDpiRatio);
 751
 752   if (aState.HasState(ElementState::FOCUSRING)) {
 753     PaintRoundedFocusRect(aDrawTarget, aRect, aColors, aDpiRatio,
 754                           radius + kMenulistBorderWidth, -kMenulistBorderWidth);
 755   }
 756 }
 757
 758 enum class PhysicalArrowDirection {
 759   Right,
 760   Left,
 761   Bottom,
 762 };
 763
 764 void Theme::PaintMenulistArrow(nsIFrame* aFrame, DrawTarget& aDrawTarget,
 765                                const LayoutDeviceRect& aRect) {
 766   // not const: these may be negated in-place below
 767   float polygonX[] = {-4.0f, -0.5f, 0.5f, 4.0f,  4.0f,
 768                       3.0f,  0.0f,  0.0f, -3.0f, -4.0f};
 769   float polygonY[] = {-1,    3.0f, 3.0f, -1.0f, -2.0f,
 770                       -2.0f, 1.5f, 1.5f, -2.0f, -2.0f};
 771
 772   const float kPolygonSize = kMinimumDropdownArrowButtonWidth;
 773   const auto direction = [&] {
 774     const auto wm = aFrame->GetWritingMode();
 775     switch (wm.GetBlockDir()) {
 776       case WritingMode::BlockDir::eBlockLR:
 777         return PhysicalArrowDirection::Right;
 778       case WritingMode::BlockDir::eBlockRL:
 779         return PhysicalArrowDirection::Left;
 780       case WritingMode::BlockDir::eBlockTB:
 781         return PhysicalArrowDirection::Bottom;
 782     }
 783     MOZ_ASSERT_UNREACHABLE("Unknown direction?");
 784     return PhysicalArrowDirection::Bottom;
 785   }();
 786
 787   auto const [xs, ys] = [&] {
 788     using Pair = std::pair<const float*, const float*>;
 789     switch (direction) {
 790       case PhysicalArrowDirection::Left:
 791         // rotate 90°: [[0,1],[-1,0]]
 792         for (float& f : polygonY) {
 793           f = -f;
 794         }
 795         return Pair(polygonY, polygonX);
 796
 797       case PhysicalArrowDirection::Right:
 798         // rotate 270°: [[0,-1],[1,0]]
 799         for (float& f : polygonX) {
 800           f = -f;
 801         }
 802         return Pair(polygonY, polygonX);
 803
 804       case PhysicalArrowDirection::Bottom:
 805         // rotate 0°: [[1,0],[0,1]]
 806         return Pair(polygonX, polygonY);
 807     }
 808     MOZ_ASSERT_UNREACHABLE("Unknown direction?");
 809     return Pair(polygonX, polygonY);
 810   }();
 811
 812   const auto arrowColor = sRGBColor::FromABGR(
 813       nsLayoutUtils::GetColor(aFrame, &nsStyleText::mWebkitTextFillColor));
 814   ThemeDrawing::PaintArrow(aDrawTarget, aRect, xs, ys, kPolygonSize,
 815                            ArrayLength(polygonX), arrowColor);
 816 }
 817
 818 void Theme::PaintSpinnerButton(nsIFrame* aFrame, DrawTarget& aDrawTarget,
 819                                const LayoutDeviceRect& aRect,
 820                                const ElementState& aState,
 821                                StyleAppearance aAppearance,
 822                                const Colors& aColors, DPIRatio aDpiRatio) {
 823   auto [backgroundColor, borderColor] = ComputeButtonColors(aState, aColors);
 824
 825   aDrawTarget.FillRect(aRect.ToUnknownRect(),
 826                        ColorPattern(ToDeviceColor(backgroundColor)));
 827
 828   const float kPolygonX[] = {-3.5f, -0.5f, 0.5f, 3.5f,  3.5f,
 829                              2.5f,  0.0f,  0.0f, -2.5f, -3.5f};
 830   float polygonY[] = {-1.5f, 1.5f, 1.5f, -1.5f, -2.5f,
 831                       -2.5f, 0.0f, 0.0f, -2.5f, -2.5f};
 832
 833   const float kPolygonSize = kMinimumSpinnerButtonHeight;
 834   if (aAppearance == StyleAppearance::SpinnerUpbutton) {
 835     for (auto& coord : polygonY) {
 836       coord = -coord;
 837     }
 838   }
 839
 840   ThemeDrawing::PaintArrow(aDrawTarget, aRect, kPolygonX, polygonY,
 841                            kPolygonSize, ArrayLength(kPolygonX), borderColor);
 842 }
 843
 844 template <typename PaintBackendData>
 845 void Theme::PaintRange(nsIFrame* aFrame, PaintBackendData& aPaintData,
 846                        const LayoutDeviceRect& aRect,
 847                        const ElementState& aState, const Colors& aColors,
 848                        DPIRatio aDpiRatio, bool aHorizontal) {
 849   nsRangeFrame* rangeFrame = do_QueryFrame(aFrame);
 850   if (!rangeFrame) {
 851     return;
 852   }
 853
 854   auto tickMarks = rangeFrame->TickMarks();
 855   double progress = rangeFrame->GetValueAsFractionOfRange();
 856   auto rect = aRect;
 857   LayoutDeviceRect thumbRect(0, 0, kMinimumRangeThumbSize * aDpiRatio,
 858                              kMinimumRangeThumbSize * aDpiRatio);
 859   LayoutDeviceRect progressClipRect(aRect);
 860   LayoutDeviceRect trackClipRect(aRect);
 861   const LayoutDeviceCoord verticalSize = kRangeHeight * aDpiRatio;
 862   const LayoutDeviceCoord tickMarkWidth(
 863       ThemeDrawing::SnapBorderWidth(1.0f, aDpiRatio));
 864   const LayoutDeviceCoord tickMarkHeight(
 865       ThemeDrawing::SnapBorderWidth(5.0f, aDpiRatio));
 866   LayoutDevicePoint tickMarkOrigin, tickMarkDirection;
 867   LayoutDeviceSize tickMarkSize;
 868   if (aHorizontal) {
 869     rect.height = verticalSize;
 870     rect.y = aRect.y + (aRect.height - rect.height) / 2;
 871     tickMarkSize = LayoutDeviceSize(tickMarkWidth, tickMarkHeight);
 872     thumbRect.y = aRect.y + (aRect.height - thumbRect.height) / 2;
 873
 874     if (IsFrameRTL(aFrame)) {
 875       tickMarkOrigin =
 876           LayoutDevicePoint(aRect.XMost() - thumbRect.width / 2, aRect.YMost());
 877       tickMarkDirection = LayoutDevicePoint(-1.0f, 0.0f);
 878       thumbRect.x =
 879           aRect.x + (aRect.width - thumbRect.width) * (1.0 - progress);
 880       float midPoint = thumbRect.Center().X();
 881       trackClipRect.SetBoxX(aRect.X(), midPoint);
 882       progressClipRect.SetBoxX(midPoint, aRect.XMost());
 883     } else {
 884       tickMarkOrigin =
 885           LayoutDevicePoint(aRect.x + thumbRect.width / 2, aRect.YMost());
 886       tickMarkDirection = LayoutDevicePoint(1.0, 0.0f);
 887       thumbRect.x = aRect.x + (aRect.width - thumbRect.width) * progress;
 888       float midPoint = thumbRect.Center().X();
 889       progressClipRect.SetBoxX(aRect.X(), midPoint);
 890       trackClipRect.SetBoxX(midPoint, aRect.XMost());
 891     }
 892   } else {
 893     rect.width = verticalSize;
 894     rect.x = aRect.x + (aRect.width - rect.width) / 2;
 895     tickMarkOrigin = LayoutDevicePoint(aRect.XMost() - tickMarkHeight / 4,
 896                                        aRect.YMost() - thumbRect.width / 2);
 897     tickMarkDirection = LayoutDevicePoint(0.0f, -1.0f);
 898     tickMarkSize = LayoutDeviceSize(tickMarkHeight, tickMarkWidth);
 899     thumbRect.x = aRect.x + (aRect.width - thumbRect.width) / 2;
 900
 901     if (rangeFrame->IsUpwards()) {
 902       thumbRect.y =
 903           aRect.y + (aRect.height - thumbRect.height) * (1.0 - progress);
 904       float midPoint = thumbRect.Center().Y();
 905       trackClipRect.SetBoxY(aRect.Y(), midPoint);
 906       progressClipRect.SetBoxY(midPoint, aRect.YMost());
 907     } else {
 908       thumbRect.y = aRect.y + (aRect.height - thumbRect.height) * progress;
 909       float midPoint = thumbRect.Center().Y();
 910       trackClipRect.SetBoxY(midPoint, aRect.YMost());
 911       progressClipRect.SetBoxY(aRect.Y(), midPoint);
 912     }
 913   }
 914
 915   const CSSCoord borderWidth = 1.0f;
 916   const CSSCoord radius = 3.0f;
 917
 918   auto [progressColor, progressBorderColor] =
 919       ComputeRangeProgressColors(aState, aColors);
 920   auto [trackColor, trackBorderColor] =
 921       ComputeRangeTrackColors(aState, aColors);
 922   auto tickMarkColor = trackBorderColor;
 923
 924   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, rect, progressClipRect,
 925                                            progressColor, progressBorderColor,
 926                                            borderWidth, radius, aDpiRatio);
 927
 928   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, rect, trackClipRect,
 929                                            trackColor, trackBorderColor,
 930                                            borderWidth, radius, aDpiRatio);
 931
 932   if (!aState.HasState(ElementState::DISABLED)) {
 933     // Ensure the shadow doesn't expand outside of our overflow rect declared in
 934     // GetWidgetOverflow().
 935     auto overflowRect = aRect;
 936     overflowRect.Inflate(CSSCoord(6.0f) * aDpiRatio);
 937     // Thumb shadow
 938     PaintCircleShadow(aPaintData, thumbRect, overflowRect, 0.3f,
 939                       CSSPoint(0.0f, 2.0f), 2.0f, aDpiRatio);
 940   }
 941
 942   tickMarkDirection.x *= aRect.width - thumbRect.width;
 943   tickMarkDirection.y *= aRect.height - thumbRect.height;
 944   tickMarkOrigin -=
 945       LayoutDevicePoint(tickMarkSize.width, tickMarkSize.height) / 2;
 946   auto tickMarkRect = LayoutDeviceRect(tickMarkOrigin, tickMarkSize);
 947   for (auto tickMark : tickMarks) {
 948     auto tickMarkOffset =
 949         tickMarkDirection *
 950         float(rangeFrame->GetDoubleAsFractionOfRange(tickMark));
 951     ThemeDrawing::FillRect(aPaintData, tickMarkRect + tickMarkOffset,
 952                            tickMarkColor);
 953   }
 954
 955   // Draw the thumb on top.
 956   const CSSCoord thumbBorderWidth = 2.0f;
 957   auto [thumbColor, thumbBorderColor] =
 958       ComputeRangeThumbColors(aState, aColors);
 959
 960   PaintStrokedCircle(aPaintData, thumbRect, thumbColor, thumbBorderColor,
 961                      thumbBorderWidth, aDpiRatio);
 962
 963   if (aState.HasState(ElementState::FOCUSRING)) {
 964     PaintRoundedFocusRect(aPaintData, aRect, aColors, aDpiRatio, radius, 1.0f);
 965   }
 966 }
 967
 968 template <typename PaintBackendData>
 969 void Theme::PaintProgress(nsIFrame* aFrame, PaintBackendData& aPaintData,
 970                           const LayoutDeviceRect& aRect,
 971                           const ElementState& aState, const Colors& aColors,
 972                           DPIRatio aDpiRatio, bool aIsMeter) {
 973   const CSSCoord borderWidth = 1.0f;
 974   const CSSCoord radius = aIsMeter ? 6.0f : 3.0f;
 975
 976   LayoutDeviceRect rect(aRect);
 977   const LayoutDeviceCoord thickness =
 978       (aIsMeter ? kMeterHeight : kProgressbarHeight) * aDpiRatio;
 979
 980   const bool isHorizontal = !nsNativeTheme::IsVerticalProgress(aFrame);
 981   if (isHorizontal) {
 982     // Center it vertically.
 983     rect.y += (rect.height - thickness) / 2;
 984     rect.height = thickness;
 985   } else {
 986     // Center it horizontally.
 987     rect.x += (rect.width - thickness) / 2;
 988     rect.width = thickness;
 989   }
 990
 991   {
 992     // Paint the track, unclipped.
 993     auto [backgroundColor, borderColor] = ComputeProgressTrackColors(aColors);
 994     ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, rect, rect,
 995                                              backgroundColor, borderColor,
 996                                              borderWidth, radius, aDpiRatio);
 997   }
 998
 999   // Now paint the chunk, clipped as needed.
1000   LayoutDeviceRect clipRect = rect;
1001   if (aState.HasState(ElementState::INDETERMINATE)) {
1002     // For indeterminate progress, we paint an animated chunk of 1/3 of the
1003     // progress size.
1004     //
1005     // Animation speed and math borrowed from GTK.
1006     const LayoutDeviceCoord size = isHorizontal ? rect.width : rect.height;
1007     const LayoutDeviceCoord barSize = size * 0.3333f;
1008     const LayoutDeviceCoord travel = 2.0f * (size - barSize);
1009
1010     // Period equals to travel / pixelsPerMillisecond where pixelsPerMillisecond
1011     // equals progressSize / 1000.0.  This is equivalent to 1600.
1012     const unsigned kPeriod = 1600;
1013
1014     const int t = PR_IntervalToMilliseconds(PR_IntervalNow()) % kPeriod;
1015     const LayoutDeviceCoord dx = travel * float(t) / float(kPeriod);
1016     if (isHorizontal) {
1017       rect.width = barSize;
1018       rect.x += (dx < travel * .5f) ? dx : travel - dx;
1019     } else {
1020       rect.height = barSize;
1021       rect.y += (dx < travel * .5f) ? dx : travel - dx;
1022     }
1023     clipRect = rect;
1024     // Queue the next frame if needed.
1025     if (!QueueAnimatedContentForRefresh(aFrame->GetContent(), 60)) {
1026       NS_WARNING("Couldn't refresh indeterminate <progress>");
1027     }
1028   } else {
1029     // This is the progress chunk, clip it to the right amount.
1030     double position = [&] {
1031       if (aIsMeter) {
1032         auto* meter = dom::HTMLMeterElement::FromNode(aFrame->GetContent());
1033         if (!meter) {
1034           return 0.0;
1035         }
1036         return meter->Position();
1037       }
1038       auto* progress = dom::HTMLProgressElement::FromNode(aFrame->GetContent());
1039       if (!progress) {
1040         return 0.0;
1041       }
1042       return progress->Position();
1043     }();
1044     if (isHorizontal) {
1045       double clipWidth = rect.width * position;
1046       clipRect.width = clipWidth;
1047       if (IsFrameRTL(aFrame)) {
1048         clipRect.x += rect.width - clipWidth;
1049       }
1050     } else {
1051       double clipHeight = rect.height * position;
1052       clipRect.height = clipHeight;
1053       clipRect.y += rect.height - clipHeight;
1054     }
1055   }
1056
1057   auto [backgroundColor, borderColor] =
1058       aIsMeter ? ComputeMeterchunkColors(aState, aColors)
1059                : ComputeProgressColors(aColors);
1060   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, rect, clipRect,
1061                                            backgroundColor, borderColor,
1062                                            borderWidth, radius, aDpiRatio);
1063 }
1064
1065 template <typename PaintBackendData>
1066 void Theme::PaintButton(nsIFrame* aFrame, PaintBackendData& aPaintData,
1067                         const LayoutDeviceRect& aRect,
1068                         StyleAppearance aAppearance, const ElementState& aState,
1069                         const Colors& aColors, DPIRatio aDpiRatio) {
1070   const CSSCoord radius = 4.0f;
1071   auto [backgroundColor, borderColor] =
1072       ComputeButtonColors(aState, aColors, aFrame);
1073
1074   if (aAppearance == StyleAppearance::Toolbarbutton &&
1075       (!aState.HasState(ElementState::HOVER) ||
1076        aState.HasState(ElementState::DISABLED))) {
1077     borderColor = sTransparent;
1078   }
1079
1080   ThemeDrawing::PaintRoundedRectWithRadius(aPaintData, aRect, backgroundColor,
1081                                            borderColor, kButtonBorderWidth,
1082                                            radius, aDpiRatio);
1083
1084   if (aState.HasState(ElementState::FOCUSRING)) {
1085     PaintRoundedFocusRect(aPaintData, aRect, aColors, aDpiRatio,
1086                           radius + kButtonBorderWidth, -kButtonBorderWidth);
1087   }
1088 }
1089
1090 NS_IMETHODIMP
1091 Theme::DrawWidgetBackground(gfxContext* aContext, nsIFrame* aFrame,
1092                             StyleAppearance aAppearance, const nsRect& aRect,
1093                             const nsRect& /* aDirtyRect */,
1094                             DrawOverflow aDrawOverflow) {
1095   if (!DoDrawWidgetBackground(*aContext->GetDrawTarget(), aFrame, aAppearance,
1096                               aRect, aDrawOverflow)) {
1097     return NS_ERROR_NOT_IMPLEMENTED;
1098   }
1099   return NS_OK;
1100 }
1101
1102 bool Theme::CreateWebRenderCommandsForWidget(
1103     mozilla::wr::DisplayListBuilder& aBuilder,
1104     mozilla::wr::IpcResourceUpdateQueue& aResources,
1105     const mozilla::layers::StackingContextHelper& aSc,
1106     mozilla::layers::RenderRootStateManager* aManager, nsIFrame* aFrame,
1107     StyleAppearance aAppearance, const nsRect& aRect) {
1108   if (!StaticPrefs::widget_non_native_theme_webrender()) {
1109     return false;
1110   }
1111   WebRenderBackendData data{aBuilder, aResources, aSc, aManager};
1112   return DoDrawWidgetBackground(data, aFrame, aAppearance, aRect,
1113                                 DrawOverflow::Yes);
1114 }
1115
1116 static LayoutDeviceRect ToSnappedRect(const nsRect& aRect,
1117                                       nscoord aTwipsPerPixel, DrawTarget& aDt) {
1118   return LayoutDeviceRect::FromUnknownRect(
1119       NSRectToSnappedRect(aRect, aTwipsPerPixel, aDt));
1120 }
1121
1122 static LayoutDeviceRect ToSnappedRect(const nsRect& aRect,
1123                                       nscoord aTwipsPerPixel,
1124                                       WebRenderBackendData& aDt) {
1125   // TODO: Do we need to do any more snapping here?
1126   return LayoutDeviceRect::FromAppUnits(aRect, aTwipsPerPixel);
1127 }
1128
1129 static ScrollbarDrawing::ScrollbarKind ComputeScrollbarKind(
1130     nsIFrame* aFrame, bool aIsHorizontal) {
1131   if (aIsHorizontal) {
1132     return ScrollbarDrawing::ScrollbarKind::Horizontal;
1133   }
1134   nsIFrame* scrollbar = ScrollbarDrawing::GetParentScrollbarFrame(aFrame);
1135   if (NS_WARN_IF(!scrollbar)) {
1136     return ScrollbarDrawing::ScrollbarKind::VerticalRight;
1137   }
1138   MOZ_ASSERT(scrollbar->IsScrollbarFrame());
1139   nsIScrollbarMediator* sm =
1140       static_cast<nsScrollbarFrame*>(scrollbar)->GetScrollbarMediator();
1141   if (NS_WARN_IF(!sm)) {
1142     return ScrollbarDrawing::ScrollbarKind::VerticalRight;
1143   }
1144   return sm->IsScrollbarOnRight()
1145              ? ScrollbarDrawing::ScrollbarKind::VerticalRight
1146              : ScrollbarDrawing::ScrollbarKind::VerticalLeft;
1147 }
1148
1149 static ScrollbarDrawing::ScrollbarKind ComputeScrollbarKindForScrollCorner(
1150     nsIFrame* aFrame) {
1151   nsIScrollableFrame* sf = do_QueryFrame(aFrame->GetParent());
1152   if (!sf) {
1153     return ScrollbarDrawing::ScrollbarKind::VerticalRight;
1154   }
1155   return sf->IsScrollbarOnRight()
1156              ? ScrollbarDrawing::ScrollbarKind::VerticalRight
1157              : ScrollbarDrawing::ScrollbarKind::VerticalLeft;
1158 }
1159
1160 template <typename PaintBackendData>
1161 bool Theme::DoDrawWidgetBackground(PaintBackendData& aPaintData,
1162                                    nsIFrame* aFrame,
1163                                    StyleAppearance aAppearance,
1164                                    const nsRect& aRect,
1165                                    DrawOverflow aDrawOverflow) {
1166   static_assert(std::is_same_v<PaintBackendData, DrawTarget> ||
1167                 std::is_same_v<PaintBackendData, WebRenderBackendData>);
1168
1169   const nsPresContext* pc = aFrame->PresContext();
1170   const nscoord twipsPerPixel = pc->AppUnitsPerDevPixel();
1171   const auto devPxRect = ToSnappedRect(aRect, twipsPerPixel, aPaintData);
1172
1173   const DocumentState docState = pc->Document()->State();
1174   ElementState elementState = GetContentState(aFrame, aAppearance);
1175   // Paint the outline iff we're asked to draw overflow and we have
1176   // outline-style: auto.
1177   if (aDrawOverflow == DrawOverflow::Yes &&
1178       aFrame->StyleOutline()->mOutlineStyle.IsAuto()) {
1179     elementState |= ElementState::FOCUSRING;
1180   } else {
1181     elementState &= ~ElementState::FOCUSRING;
1182   }
1183
1184   // Hack to avoid skia fuzziness: Add a dummy clip if the widget doesn't
1185   // overflow devPxRect.
1186   Maybe<AutoClipRect> maybeClipRect;
1187   if constexpr (std::is_same_v<PaintBackendData, DrawTarget>) {
1188     if (aAppearance != StyleAppearance::FocusOutline &&
1189         aAppearance != StyleAppearance::Range &&
1190         !elementState.HasState(ElementState::FOCUSRING)) {
1191       maybeClipRect.emplace(aPaintData, devPxRect);
1192     }
1193   }
1194
1195   const Colors colors(aFrame, aAppearance);
1196   DPIRatio dpiRatio = GetDPIRatio(aFrame, aAppearance);
1197
1198   switch (aAppearance) {
1199     case StyleAppearance::Radio: {
1200       auto rect = CheckBoxRadioRect(devPxRect);
1201       PaintRadioControl(aPaintData, rect, elementState, colors, dpiRatio);
1202       break;
1203     }
1204     case StyleAppearance::Checkbox: {
1205       if constexpr (std::is_same_v<PaintBackendData, WebRenderBackendData>) {
1206         // TODO: Need to figure out how to best draw this using WR.
1207         return false;
1208       } else {
1209         auto rect = CheckBoxRadioRect(devPxRect);
1210         PaintCheckboxControl(aPaintData, rect, elementState, colors, dpiRatio);
1211       }
1212       break;
1213     }
1214     case StyleAppearance::Textarea:
1215     case StyleAppearance::Textfield:
1216     case StyleAppearance::NumberInput:
1217       PaintTextField(aPaintData, devPxRect, elementState, colors, dpiRatio);
1218       break;
1219     case StyleAppearance::Listbox:
1220       PaintListbox(aPaintData, devPxRect, elementState, colors, dpiRatio);
1221       break;
1222     case StyleAppearance::MenulistButton:
1223     case StyleAppearance::Menulist:
1224       PaintMenulist(aPaintData, devPxRect, elementState, colors, dpiRatio);
1225       break;
1226     case StyleAppearance::MozMenulistArrowButton:
1227       if constexpr (std::is_same_v<PaintBackendData, WebRenderBackendData>) {
1228         // TODO: Need to figure out how to best draw this using WR.
1229         return false;
1230       } else {
1231         PaintMenulistArrow(aFrame, aPaintData, devPxRect);
1232       }
1233       break;
1234     case StyleAppearance::Tooltip: {
1235       const CSSCoord strokeWidth(1.0f);
1236       const CSSCoord strokeRadius(2.0f);
1237       ThemeDrawing::PaintRoundedRectWithRadius(
1238           aPaintData, devPxRect,
1239           colors.System(StyleSystemColor::Infobackground),
1240           colors.System(StyleSystemColor::Infotext), strokeWidth, strokeRadius,
1241           dpiRatio);
1242       break;
1243     }
1244     case StyleAppearance::SpinnerUpbutton:
1245     case StyleAppearance::SpinnerDownbutton:
1246       if constexpr (std::is_same_v<PaintBackendData, WebRenderBackendData>) {
1247         // TODO: Need to figure out how to best draw this using WR.
1248         return false;
1249       } else {
1250         PaintSpinnerButton(aFrame, aPaintData, devPxRect, elementState,
1251                            aAppearance, colors, dpiRatio);
1252       }
1253       break;
1254     case StyleAppearance::Range:
1255       PaintRange(aFrame, aPaintData, devPxRect, elementState, colors, dpiRatio,
1256                  IsRangeHorizontal(aFrame));
1257       break;
1258     case StyleAppearance::RangeThumb:
1259       // Painted as part of StyleAppearance::Range.
1260       break;
1261     case StyleAppearance::ProgressBar:
1262       PaintProgress(aFrame, aPaintData, devPxRect, elementState, colors,
1263                     dpiRatio,
1264                     /* aIsMeter = */ false);
1265       break;
1266     case StyleAppearance::Progresschunk:
1267       /* Painted as part of the progress bar */
1268       break;
1269     case StyleAppearance::Meter:
1270       PaintProgress(aFrame, aPaintData, devPxRect, elementState, colors,
1271                     dpiRatio,
1272                     /* aIsMeter = */ true);
1273       break;
1274     case StyleAppearance::Meterchunk:
1275       /* Painted as part of the meter bar */
1276       break;
1277     case StyleAppearance::ScrollbarthumbHorizontal:
1278     case StyleAppearance::ScrollbarthumbVertical: {
1279       bool isHorizontal =
1280           aAppearance == StyleAppearance::ScrollbarthumbHorizontal;
1281       auto kind = ComputeScrollbarKind(aFrame, isHorizontal);
1282       return GetScrollbarDrawing().PaintScrollbarThumb(
1283           aPaintData, devPxRect, kind, aFrame,
1284           *nsLayoutUtils::StyleForScrollbar(aFrame), elementState, docState,
1285           colors, dpiRatio);
1286     }
1287     case StyleAppearance::ScrollbartrackHorizontal:
1288     case StyleAppearance::ScrollbartrackVertical: {
1289       bool isHorizontal =
1290           aAppearance == StyleAppearance::ScrollbartrackHorizontal;
1291       auto kind = ComputeScrollbarKind(aFrame, isHorizontal);
1292       return GetScrollbarDrawing().PaintScrollbarTrack(
1293           aPaintData, devPxRect, kind, aFrame,
1294           *nsLayoutUtils::StyleForScrollbar(aFrame), docState, colors,
1295           dpiRatio);
1296     }
1297     case StyleAppearance::ScrollbarHorizontal:
1298     case StyleAppearance::ScrollbarVertical: {
1299       bool isHorizontal = aAppearance == StyleAppearance::ScrollbarHorizontal;
1300       auto kind = ComputeScrollbarKind(aFrame, isHorizontal);
1301       return GetScrollbarDrawing().PaintScrollbar(
1302           aPaintData, devPxRect, kind, aFrame,
1303           *nsLayoutUtils::StyleForScrollbar(aFrame), elementState, docState,
1304           colors, dpiRatio);
1305     }
1306     case StyleAppearance::Scrollcorner: {
1307       auto kind = ComputeScrollbarKindForScrollCorner(aFrame);
1308       return GetScrollbarDrawing().PaintScrollCorner(
1309           aPaintData, devPxRect, kind, aFrame,
1310           *nsLayoutUtils::StyleForScrollbar(aFrame), docState, colors,
1311           dpiRatio);
1312     }
1313     case StyleAppearance::ScrollbarbuttonUp:
1314     case StyleAppearance::ScrollbarbuttonDown:
1315     case StyleAppearance::ScrollbarbuttonLeft:
1316     case StyleAppearance::ScrollbarbuttonRight: {
1317       // For scrollbar-width:thin, we don't display the buttons.
1318       if (!ScrollbarDrawing::IsScrollbarWidthThin(aFrame)) {
1319         if constexpr (std::is_same_v<PaintBackendData, WebRenderBackendData>) {
1320           // TODO: Need to figure out how to best draw this using WR.
1321           return false;
1322         } else {
1323           bool isHorizontal =
1324               aAppearance == StyleAppearance::ScrollbarbuttonLeft ||
1325               aAppearance == StyleAppearance::ScrollbarbuttonRight;
1326           auto kind = ComputeScrollbarKind(aFrame, isHorizontal);
1327           GetScrollbarDrawing().PaintScrollbarButton(
1328               aPaintData, aAppearance, devPxRect, kind, aFrame,
1329               *nsLayoutUtils::StyleForScrollbar(aFrame), elementState, docState,
1330               colors, dpiRatio);
1331         }
1332       }
1333       break;
1334     }
1335     case StyleAppearance::Button:
1336     case StyleAppearance::Toolbarbutton:
1337       PaintButton(aFrame, aPaintData, devPxRect, aAppearance, elementState,
1338                   colors, dpiRatio);
1339       break;
1340     case StyleAppearance::FocusOutline:
1341       PaintAutoStyleOutline(aFrame, aPaintData, devPxRect, colors, dpiRatio);
1342       break;
1343     default:
1344       // Various appearance values are used for XUL elements.  Normally these
1345       // will not be available in content documents (and thus in the content
1346       // processes where the native basic theme can be used), but tests are
1347       // run with the remote XUL pref enabled and so we can get in here.  So
1348       // we just return an error rather than assert.
1349       return false;
1350   }
1351
1352   return true;
1353 }
1354
1355 template <typename PaintBackendData>
1356 void Theme::PaintAutoStyleOutline(nsIFrame* aFrame,
1357                                   PaintBackendData& aPaintData,
1358                                   const LayoutDeviceRect& aRect,
1359                                   const Colors& aColors, DPIRatio aDpiRatio) {
1360   const auto& accentColor = aColors.Accent();
1361   const bool solid = StaticPrefs::widget_non_native_theme_solid_outline_style();
1362   LayoutDeviceCoord strokeWidth(ThemeDrawing::SnapBorderWidth(2.0f, aDpiRatio));
1363
1364   LayoutDeviceRect rect(aRect);
1365   rect.Inflate(strokeWidth);
1366
1367   const nscoord a2d = aFrame->PresContext()->AppUnitsPerDevPixel();
1368   nscoord cssOffset = aFrame->StyleOutline()->mOutlineOffset.ToAppUnits();
1369   nscoord cssRadii[8] = {0};
1370   if (!aFrame->GetBorderRadii(cssRadii)) {
1371     const auto twoPixels = 2 * AppUnitsPerCSSPixel();
1372     const nscoord radius =
1373         cssOffset >= 0 ? twoPixels : std::max(twoPixels + cssOffset, 0);
1374     cssOffset = -twoPixels;
1375     for (auto& r : cssRadii) {
1376       r = radius;
1377     }
1378   }
1379
1380   auto offset = LayoutDevicePixel::FromAppUnits(cssOffset, a2d);
1381   RectCornerRadii innerRadii;
1382   nsCSSRendering::ComputePixelRadii(cssRadii, a2d, &innerRadii);
1383
1384   // NOTE(emilio): This doesn't use PaintRoundedRectWithRadius because we need
1385   // to support arbitrary radii.
1386   auto DrawRect = [&](const sRGBColor& aColor) {
1387     RectCornerRadii outerRadii;
1388     if constexpr (std::is_same_v<PaintBackendData, WebRenderBackendData>) {
1389       const Float widths[4] = {strokeWidth + offset, strokeWidth + offset,
1390                                strokeWidth + offset, strokeWidth + offset};
1391       nsCSSBorderRenderer::ComputeOuterRadii(innerRadii, widths, &outerRadii);
1392       const auto dest = wr::ToLayoutRect(rect);
1393       const auto side =
1394           wr::ToBorderSide(ToDeviceColor(aColor), StyleBorderStyle::Solid);
1395       const wr::BorderSide sides[4] = {side, side, side, side};
1396       const bool kBackfaceIsVisible = true;
1397       const auto wrWidths = wr::ToBorderWidths(strokeWidth, strokeWidth,
1398                                                strokeWidth, strokeWidth);
1399       const auto wrRadius = wr::ToBorderRadius(outerRadii);
1400       aPaintData.mBuilder.PushBorder(dest, dest, kBackfaceIsVisible, wrWidths,
1401                                      {sides, 4}, wrRadius);
1402     } else {
1403       const LayoutDeviceCoord halfWidth = strokeWidth * 0.5f;
1404       const Float widths[4] = {halfWidth + offset, halfWidth + offset,
1405                                halfWidth + offset, halfWidth + offset};
1406       nsCSSBorderRenderer::ComputeOuterRadii(innerRadii, widths, &outerRadii);
1407       LayoutDeviceRect dest(rect);
1408       dest.Deflate(halfWidth);
1409       RefPtr<Path> path =
1410           MakePathForRoundedRect(aPaintData, dest.ToUnknownRect(), outerRadii);
1411       aPaintData.Stroke(path, ColorPattern(ToDeviceColor(aColor)),
1412                         StrokeOptions(strokeWidth));
1413     }
1414   };
1415
1416   auto primaryColor = aColors.HighContrast()
1417                           ? aColors.System(StyleSystemColor::Selecteditem)
1418                           : accentColor.Get();
1419   DrawRect(primaryColor);
1420
1421   if (solid) {
1422     return;
1423   }
1424
1425   offset += strokeWidth;
1426
1427   strokeWidth =
1428       LayoutDeviceCoord(ThemeDrawing::SnapBorderWidth(1.0f, aDpiRatio));
1429   rect.Inflate(strokeWidth);
1430
1431   auto secondaryColor = aColors.HighContrast()
1432                             ? aColors.System(StyleSystemColor::Canvastext)
1433                             : accentColor.GetForeground();
1434   DrawRect(secondaryColor);
1435 }
1436
1437 LayoutDeviceIntMargin Theme::GetWidgetBorder(nsDeviceContext* aContext,
1438                                              nsIFrame* aFrame,
1439                                              StyleAppearance aAppearance) {
1440   switch (aAppearance) {
1441     case StyleAppearance::Textfield:
1442     case StyleAppearance::Textarea:
1443     case StyleAppearance::NumberInput:
1444     case StyleAppearance::Listbox:
1445     case StyleAppearance::Menulist:
1446     case StyleAppearance::MenulistButton:
1447     case StyleAppearance::Button:
1448     case StyleAppearance::Toolbarbutton:
1449       // Return the border size from the UA sheet, even though what we paint
1450       // doesn't actually match that. We know this is the UA sheet border
1451       // because we disable native theming when different border widths are
1452       // specified by authors, see Theme::IsWidgetStyled.
1453       //
1454       // The Rounded() bit is technically redundant, but needed to appease the
1455       // type system, we should always end up with full device pixels due to
1456       // round_border_to_device_pixels at style time.
1457       return LayoutDeviceIntMargin::FromAppUnits(
1458                  aFrame->StyleBorder()->GetComputedBorder(),
1459                  aFrame->PresContext()->AppUnitsPerDevPixel())
1460           .Rounded();
1461     case StyleAppearance::Checkbox:
1462     case StyleAppearance::Radio: {
1463       DPIRatio dpiRatio = GetDPIRatio(aFrame, aAppearance);
1464       LayoutDeviceIntCoord w =
1465           ThemeDrawing::SnapBorderWidth(kCheckboxRadioBorderWidth, dpiRatio);
1466       return LayoutDeviceIntMargin(w, w, w, w);
1467     }
1468     default:
1469       return LayoutDeviceIntMargin();
1470   }
1471 }
1472
1473 bool Theme::GetWidgetPadding(nsDeviceContext* aContext, nsIFrame* aFrame,
1474                              StyleAppearance aAppearance,
1475                              LayoutDeviceIntMargin* aResult) {
1476   switch (aAppearance) {
1477     // Radios and checkboxes return a fixed size in GetMinimumWidgetSize
1478     // and have a meaningful baseline, so they can't have
1479     // author-specified padding.
1480     case StyleAppearance::Radio:
1481     case StyleAppearance::Checkbox:
1482       aResult->SizeTo(0, 0, 0, 0);
1483       return true;
1484     default:
1485       break;
1486   }
1487   return false;
1488 }
1489
1490 bool Theme::GetWidgetOverflow(nsDeviceContext* aContext, nsIFrame* aFrame,
1491                               StyleAppearance aAppearance,
1492                               nsRect* aOverflowRect) {
1493   CSSIntMargin overflow;
1494   switch (aAppearance) {
1495     case StyleAppearance::FocusOutline: {
1496       // 2px * one segment, or 2px + 1px
1497       const auto width =
1498           StaticPrefs::widget_non_native_theme_solid_outline_style() ? 2 : 3;
1499       overflow.SizeTo(width, width, width, width);
1500       break;
1501     }
1502     case StyleAppearance::Radio:
1503     case StyleAppearance::Checkbox:
1504     case StyleAppearance::Range:
1505       // 2px for each outline segment, plus 1px separation, plus we paint with a
1506       // 1px extra offset, so 6px.
1507       overflow.SizeTo(6, 6, 6, 6);
1508       break;
1509     case StyleAppearance::Textarea:
1510     case StyleAppearance::Textfield:
1511     case StyleAppearance::NumberInput:
1512     case StyleAppearance::Listbox:
1513     case StyleAppearance::MenulistButton:
1514     case StyleAppearance::Menulist:
1515     case StyleAppearance::Button:
1516     case StyleAppearance::Toolbarbutton:
1517       // 2px for each segment, plus 1px separation, but we paint 1px inside
1518       // the border area so 4px overflow.
1519       overflow.SizeTo(4, 4, 4, 4);
1520       break;
1521     default:
1522       return false;
1523   }
1524
1525   // TODO: This should convert from device pixels to app units, not from CSS
1526   // pixels. And it should take the dpi ratio into account.
1527   // Using CSS pixels can cause the overflow to be too small if the page is
1528   // zoomed out.
1529   aOverflowRect->Inflate(CSSPixel::ToAppUnits(overflow));
1530   return true;
1531 }
1532
1533 LayoutDeviceIntCoord Theme::GetScrollbarSize(const nsPresContext* aPresContext,
1534                                              StyleScrollbarWidth aWidth,
1535                                              Overlay aOverlay) {
1536   return GetScrollbarDrawing().GetScrollbarSize(aPresContext, aWidth, aOverlay);
1537 }
1538
1539 nscoord Theme::GetCheckboxRadioPrefSize() {
1540   return CSSPixel::ToAppUnits(kCheckboxRadioContentBoxSize);
1541 }
1542
1543 /* static */
1544 UniquePtr<ScrollbarDrawing> Theme::ScrollbarStyle() {
1545   switch (StaticPrefs::widget_non_native_theme_scrollbar_style()) {
1546     case 1:
1547       return MakeUnique<ScrollbarDrawingCocoa>();
1548     case 2:
1549       return MakeUnique<ScrollbarDrawingGTK>();
1550     case 3:
1551       return MakeUnique<ScrollbarDrawingAndroid>();
1552     case 4:
1553       return MakeUnique<ScrollbarDrawingWin>();
1554     case 5:
1555       return MakeUnique<ScrollbarDrawingWin11>();
1556     default:
1557       break;
1558   }
1559     // Default to native scrollbar style for each platform.
1560 #ifdef XP_WIN
1561   if (IsWin11OrLater()) {
1562     return MakeUnique<ScrollbarDrawingWin11>();
1563   }
1564   return MakeUnique<ScrollbarDrawingWin>();
1565 #elif defined(MOZ_WIDGET_COCOA) || defined(MOZ_WIDGET_UIKIT)
1566   return MakeUnique<ScrollbarDrawingCocoa>();
1567 #elif MOZ_WIDGET_GTK
1568   return MakeUnique<ScrollbarDrawingGTK>();
1569 #elif ANDROID
1570   return MakeUnique<ScrollbarDrawingAndroid>();
1571 #else
1572 #  error "Unknown platform, need scrollbar implementation."
1573 #endif
1574 }
1575
1576 LayoutDeviceIntSize Theme::GetMinimumWidgetSize(nsPresContext* aPresContext,
1577                                                 nsIFrame* aFrame,
1578                                                 StyleAppearance aAppearance) {
1579   DPIRatio dpiRatio = GetDPIRatio(aFrame, aAppearance);
1580
1581   if (IsWidgetScrollbarPart(aAppearance)) {
1582     return GetScrollbarDrawing().GetMinimumWidgetSize(aPresContext, aAppearance,
1583                                                       aFrame);
1584   }
1585
1586   LayoutDeviceIntSize result;
1587   switch (aAppearance) {
1588     case StyleAppearance::RangeThumb:
1589       result.SizeTo((kMinimumRangeThumbSize * dpiRatio).Rounded(),
1590                     (kMinimumRangeThumbSize * dpiRatio).Rounded());
1591       break;
1592     case StyleAppearance::MozMenulistArrowButton:
1593       result.width = (kMinimumDropdownArrowButtonWidth * dpiRatio).Rounded();
1594       break;
1595     case StyleAppearance::SpinnerUpbutton:
1596     case StyleAppearance::SpinnerDownbutton:
1597       result.width = (kMinimumSpinnerButtonWidth * dpiRatio).Rounded();
1598       result.height = (kMinimumSpinnerButtonHeight * dpiRatio).Rounded();
1599       break;
1600     default:
1601       break;
1602   }
1603   return result;
1604 }
1605
1606 nsITheme::Transparency Theme::GetWidgetTransparency(
1607     nsIFrame* aFrame, StyleAppearance aAppearance) {
1608   if (auto scrollbar = GetScrollbarDrawing().GetScrollbarPartTransparency(
1609           aFrame, aAppearance)) {
1610     return *scrollbar;
1611   }
1612   if (aAppearance == StyleAppearance::Tooltip) {
1613     // We draw a rounded rect, so we need transparency.
1614     return eTransparent;
1615   }
1616   return eUnknownTransparency;
1617 }
1618
1619 NS_IMETHODIMP
1620 Theme::WidgetStateChanged(nsIFrame* aFrame, StyleAppearance aAppearance,
1621                           nsAtom* aAttribute, bool* aShouldRepaint,
1622                           const nsAttrValue* aOldValue) {
1623   if (!aAttribute) {
1624     // Hover/focus/active changed.  Always repaint.
1625     *aShouldRepaint = true;
1626   } else {
1627     // Check the attribute to see if it's relevant.
1628     // disabled, checked, dlgtype, default, etc.
1629     *aShouldRepaint = false;
1630     if (aAttribute == nsGkAtoms::disabled || aAttribute == nsGkAtoms::checked ||
1631         aAttribute == nsGkAtoms::selected ||
1632         aAttribute == nsGkAtoms::visuallyselected ||
1633         aAttribute == nsGkAtoms::menuactive ||
1634         aAttribute == nsGkAtoms::sortDirection ||
1635         aAttribute == nsGkAtoms::focused || aAttribute == nsGkAtoms::_default ||
1636         aAttribute == nsGkAtoms::open || aAttribute == nsGkAtoms::hover) {
1637       *aShouldRepaint = true;
1638     }
1639   }
1640
1641   return NS_OK;
1642 }
1643
1644 NS_IMETHODIMP
1645 Theme::ThemeChanged() { return NS_OK; }
1646
1647 bool Theme::WidgetAppearanceDependsOnWindowFocus(StyleAppearance aAppearance) {
1648   return IsWidgetScrollbarPart(aAppearance);
1649 }
1650
1651 nsITheme::ThemeGeometryType Theme::ThemeGeometryTypeForWidget(
1652     nsIFrame* aFrame, StyleAppearance aAppearance) {
1653   return eThemeGeometryTypeUnknown;
1654 }
1655
1656 bool Theme::ThemeSupportsWidget(nsPresContext* aPresContext, nsIFrame* aFrame,
1657                                 StyleAppearance aAppearance) {
1658   switch (aAppearance) {
1659     case StyleAppearance::Radio:
1660     case StyleAppearance::Checkbox:
1661     case StyleAppearance::FocusOutline:
1662     case StyleAppearance::Textarea:
1663     case StyleAppearance::Textfield:
1664     case StyleAppearance::Range:
1665     case StyleAppearance::RangeThumb:
1666     case StyleAppearance::ProgressBar:
1667     case StyleAppearance::Progresschunk:
1668     case StyleAppearance::Meter:
1669     case StyleAppearance::Meterchunk:
1670     case StyleAppearance::ScrollbarbuttonUp:
1671     case StyleAppearance::ScrollbarbuttonDown:
1672     case StyleAppearance::ScrollbarbuttonLeft:
1673     case StyleAppearance::ScrollbarbuttonRight:
1674     case StyleAppearance::ScrollbarthumbHorizontal:
1675     case StyleAppearance::ScrollbarthumbVertical:
1676     case StyleAppearance::ScrollbartrackHorizontal:
1677     case StyleAppearance::ScrollbartrackVertical:
1678     case StyleAppearance::ScrollbarHorizontal:
1679     case StyleAppearance::ScrollbarVertical:
1680     case StyleAppearance::Scrollcorner:
1681     case StyleAppearance::Button:
1682     case StyleAppearance::Toolbarbutton:
1683     case StyleAppearance::Listbox:
1684     case StyleAppearance::Menulist:
1685     case StyleAppearance::MenulistButton:
1686     case StyleAppearance::NumberInput:
1687     case StyleAppearance::MozMenulistArrowButton:
1688     case StyleAppearance::SpinnerUpbutton:
1689     case StyleAppearance::SpinnerDownbutton:
1690     case StyleAppearance::Tooltip:
1691       return !IsWidgetStyled(aPresContext, aFrame, aAppearance);
1692     default:
1693       return false;
1694   }
1695 }
1696
1697 bool Theme::WidgetIsContainer(StyleAppearance aAppearance) {
1698   switch (aAppearance) {
1699     case StyleAppearance::MozMenulistArrowButton:
1700     case StyleAppearance::Radio:
1701     case StyleAppearance::Checkbox:
1702       return false;
1703     default:
1704       return true;
1705   }
1706 }
1707
1708 bool Theme::ThemeDrawsFocusForWidget(nsIFrame*, StyleAppearance) {
1709   return true;
1710 }
1711
1712 bool Theme::ThemeNeedsComboboxDropmarker() { return true; }
1713
1714 bool Theme::ThemeSupportsScrollbarButtons() {
1715   return GetScrollbarDrawing().ShouldDrawScrollbarButtons();
1716 }
1717
1718 }  // namespace mozilla::widget