1 files changed, 263 insertions, 0 deletions
diff --git a/layout/base/StaticPresData.cpp b/layout/base/StaticPresData.cpp
new file mode 100644
index 0000000000..4307528e0b
--- /dev/null
+++ b/layout/base/StaticPresData.cpp
@@ -0,0 +1,263 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/StaticPresData.h"
+
+#include "gfxFontFeatures.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/ServoUtils.h"
+#include "mozilla/StaticPtr.h"
+#include "nsPresContext.h"
+
+namespace mozilla {
+
+static StaticAutoPtr<StaticPresData> sSingleton;
+
+void StaticPresData::Init() {
+  MOZ_ASSERT(!sSingleton);
+  sSingleton = new StaticPresData();
+}
+
+void StaticPresData::Shutdown() {
+  MOZ_ASSERT(sSingleton);
+  sSingleton = nullptr;
+}
+
+StaticPresData* StaticPresData::Get() {
+  MOZ_ASSERT(sSingleton);
+  return sSingleton;
+}
+
+StaticPresData::StaticPresData() {
+  mLangService = nsLanguageAtomService::GetService();
+}
+
+#define MAKE_FONT_PREF_KEY(_pref, _s0, _s1) \
+  _pref.Assign(_s0);                        \
+  _pref.Append(_s1);
+
+// clang-format off
+static const char* const kGenericFont[] = {
+  ".variable.",
+  ".serif.",
+  ".sans-serif.",
+  ".monospace.",
+  ".cursive.",
+  ".fantasy.",
+  ".system-ui.",
+};
+// clang-format on
+
+enum class DefaultFont {
+  Variable = 0,
+  Serif,
+  SansSerif,
+  Monospace,
+  Cursive,
+  Fantasy,
+  SystemUi,
+  COUNT
+};
+
+void LangGroupFontPrefs::Initialize(nsStaticAtom* aLangGroupAtom) {
+  mLangGroup = aLangGroupAtom;
+
+  /* Fetch the font prefs to be used -- see bug 61883 for details.
+     Not all prefs are needed upfront. Some are fallback prefs intended
+     for the GFX font sub-system...
+
+  -- attributes for generic fonts --------------------------------------
+
+  font.default.[langGroup] = serif | sans-serif
+    fallback generic font
+
+  font.name.[generic].[langGroup]
+    current user' selected font on the pref dialog
+
+  font.name-list.[generic].[langGroup] = fontname1, fontname2, ...
+    [factory pre-built list]
+
+  font.size.[generic].[langGroup] = integer
+    settable by the user
+
+  font.size-adjust.[generic].[langGroup] = "float"
+    settable by the user
+
+  font.minimum-size.[langGroup] = integer
+    settable by the user
+  */
+
+  nsAutoCString langGroup;
+  aLangGroupAtom->ToUTF8String(langGroup);
+
+  mDefaultVariableFont.size = Length::FromPixels(16.0f);
+  mDefaultMonospaceFont.size = Length::FromPixels(13.0f);
+
+  nsAutoCString pref;
+
+  // get font.minimum-size.[langGroup]
+
+  MAKE_FONT_PREF_KEY(pref, "font.minimum-size.", langGroup);
+
+  int32_t size = Preferences::GetInt(pref.get());
+  mMinimumFontSize = Length::FromPixels(size);
+
+  // clang-format off
+  nsFont* fontTypes[] = {
+    &mDefaultVariableFont,
+    &mDefaultSerifFont,
+    &mDefaultSansSerifFont,
+    &mDefaultMonospaceFont,
+    &mDefaultCursiveFont,
+    &mDefaultFantasyFont,
+    &mDefaultSystemUiFont,
+  };
+  // clang-format on
+  static_assert(MOZ_ARRAY_LENGTH(fontTypes) == size_t(DefaultFont::COUNT),
+                "FontTypes array count is not correct");
+
+  // Get attributes specific to each generic font. We do not get the user's
+  // generic-font-name-to-specific-family-name preferences because its the
+  // generic name that should be fed into the cascade. It is up to the GFX
+  // code to look up the font prefs to convert generic names to specific
+  // family names as necessary.
+  nsAutoCString generic_dot_langGroup;
+  for (auto type : MakeEnumeratedRange(DefaultFont::COUNT)) {
+    generic_dot_langGroup.Assign(kGenericFont[size_t(type)]);
+    generic_dot_langGroup.Append(langGroup);
+
+    nsFont* font = fontTypes[size_t(type)];
+
+    // Set the default variable font (the other fonts are seen as 'generic'
+    // fonts in GFX and will be queried there when hunting for alternative
+    // fonts)
+    if (type == DefaultFont::Variable) {
+      // XXX "font.name.variable."?  There is no such pref...
+      MAKE_FONT_PREF_KEY(pref, "font.name.variable.", langGroup);
+
+      nsAutoCString value;
+      Preferences::GetCString(pref.get(), value);
+      if (value.IsEmpty()) {
+        MAKE_FONT_PREF_KEY(pref, "font.default.", langGroup);
+        Preferences::GetCString(pref.get(), value);
+      }
+      if (!value.IsEmpty()) {
+        auto defaultVariableName = StyleSingleFontFamily::Parse(value);
+        auto defaultType = defaultVariableName.IsGeneric()
+                               ? defaultVariableName.AsGeneric()
+                               : StyleGenericFontFamily::None;
+        if (defaultType == StyleGenericFontFamily::Serif ||
+            defaultType == StyleGenericFontFamily::SansSerif) {
+          mDefaultVariableFont.family = *Servo_FontFamily_Generic(defaultType);
+        } else {
+          NS_WARNING("default type must be serif or sans-serif");
+        }
+      }
+    } else {
+      if (type != DefaultFont::Monospace) {
+        // all the other generic fonts are initialized with the size of the
+        // variable font, but their specific size can supersede later -- see
+        // below
+        font->size = mDefaultVariableFont.size;
+      }
+    }
+
+    // Bug 84398: for spec purists, a different font-size only applies to the
+    // .variable. and .fixed. fonts and the other fonts should get
+    // |font-size-adjust|. The problem is that only GfxWin has the support for
+    // |font-size-adjust|. So for parity, we enable the ability to set a
+    // different font-size on all platforms.
+
+    // get font.size.[generic].[langGroup]
+    // size=0 means 'Auto', i.e., generic fonts retain the size of the variable
+    // font
+    MAKE_FONT_PREF_KEY(pref, "font.size", generic_dot_langGroup);
+    size = Preferences::GetInt(pref.get());
+    if (size > 0) {
+      font->size = Length::FromPixels(size);
+    }
+
+    // get font.size-adjust.[generic].[langGroup]
+    // XXX only applicable on GFX ports that handle |font-size-adjust|
+    MAKE_FONT_PREF_KEY(pref, "font.size-adjust", generic_dot_langGroup);
+    nsAutoCString cvalue;
+    Preferences::GetCString(pref.get(), cvalue);
+    if (!cvalue.IsEmpty()) {
+      font->sizeAdjust =
+          StyleFontSizeAdjust::ExHeight(float(atof(cvalue.get())));
+    }
+
+#ifdef DEBUG_rbs
+    printf("%s Family-list:%s size:%d sizeAdjust:%.2f\n",
+           generic_dot_langGroup.get(), NS_ConvertUTF16toUTF8(font->name).get(),
+           font->size, font->sizeAdjust);
+#endif
+  }
+}
+
+nsStaticAtom* StaticPresData::GetLangGroup(nsAtom* aLanguage,
+                                           bool* aNeedsToCache) const {
+  nsStaticAtom* langGroupAtom =
+      mLangService->GetLanguageGroup(aLanguage, aNeedsToCache);
+  // Assume x-western is safe...
+  return langGroupAtom ? langGroupAtom : nsGkAtoms::x_western;
+}
+
+nsStaticAtom* StaticPresData::GetUncachedLangGroup(nsAtom* aLanguage) const {
+  nsStaticAtom* langGroupAtom =
+      mLangService->GetUncachedLanguageGroup(aLanguage);
+  return langGroupAtom ? langGroupAtom : nsGkAtoms::x_western;
+}
+
+const LangGroupFontPrefs* StaticPresData::GetFontPrefsForLang(
+    nsAtom* aLanguage, bool* aNeedsToCache) {
+  // Get language group for aLanguage:
+  MOZ_ASSERT(aLanguage);
+  MOZ_ASSERT(mLangService);
+
+  nsStaticAtom* langGroupAtom = GetLangGroup(aLanguage, aNeedsToCache);
+  if (aNeedsToCache && *aNeedsToCache) {
+    return nullptr;
+  }
+
+  if (!aNeedsToCache) {
+    AssertIsMainThreadOrServoFontMetricsLocked();
+  }
+
+  LangGroupFontPrefs* prefs = &mLangGroupFontPrefs;
+  if (prefs->mLangGroup) {  // if initialized
+    DebugOnly<uint32_t> count = 0;
+    for (;;) {
+      if (prefs->mLangGroup == langGroupAtom) {
+        return prefs;
+      }
+      if (!prefs->mNext) {
+        break;
+      }
+      prefs = prefs->mNext.get();
+    }
+    if (aNeedsToCache) {
+      *aNeedsToCache = true;
+      return nullptr;
+    }
+    // nothing cached, so go on and fetch the prefs for this lang group:
+    prefs->mNext = MakeUnique<LangGroupFontPrefs>();
+    prefs = prefs->mNext.get();
+  }
+
+  if (aNeedsToCache) {
+    *aNeedsToCache = true;
+    return nullptr;
+  }
+
+  AssertIsMainThreadOrServoFontMetricsLocked();
+  prefs->Initialize(langGroupAtom);
+
+  return prefs;
+}
+
+}  // namespace mozilla