abe7f841ca
Backed out changeset 3e8d2c47138c (bug 1454816) Backed out changeset 80ff20241831 (bug 1454816) Backed out changeset 28c2d6d2a683 (bug 1454816) Backed out changeset 236943ab4142 (bug 1454816)
1422 lines
50 KiB
C++
1422 lines
50 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SharedFontList-impl.h"
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#include "gfxPlatformFontList.h"
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#include "gfxFontUtils.h"
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#include "gfxFont.h"
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#include "nsReadableUtils.h"
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#include "prerror.h"
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#include "mozilla/dom/ContentChild.h"
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#include "mozilla/dom/ContentParent.h"
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#include "mozilla/Logging.h"
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#include "mozilla/Unused.h"
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#define LOG_FONTLIST(args) \
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MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontlist), LogLevel::Debug, args)
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#define LOG_FONTLIST_ENABLED() \
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MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_fontlist), LogLevel::Debug)
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namespace mozilla {
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namespace fontlist {
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static double WSSDistance(const Face* aFace, const gfxFontStyle& aStyle) {
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double stretchDist = StretchDistance(aFace->mStretch, aStyle.stretch);
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double styleDist = StyleDistance(aFace->mStyle, aStyle.style);
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double weightDist = WeightDistance(aFace->mWeight, aStyle.weight);
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// Sanity-check that the distances are within the expected range
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// (update if implementation of the distance functions is changed).
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MOZ_ASSERT(stretchDist >= 0.0 && stretchDist <= 2000.0);
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MOZ_ASSERT(styleDist >= 0.0 && styleDist <= 500.0);
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MOZ_ASSERT(weightDist >= 0.0 && weightDist <= 1600.0);
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// weight/style/stretch priority: stretch >> style >> weight
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// so we multiply the stretch and style values to make them dominate
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// the result
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return stretchDist * kStretchFactor + styleDist * kStyleFactor +
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weightDist * kWeightFactor;
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}
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void* Pointer::ToPtr(FontList* aFontList,
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size_t aSize) const MOZ_NO_THREAD_SAFETY_ANALYSIS {
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// On failure, we'll return null; callers need to handle this appropriately
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// (e.g. via fallback).
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void* result = nullptr;
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if (IsNull()) {
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return result;
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}
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// Ensure the list doesn't get replaced out from under us. Font-list rebuild
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// happens on the main thread, so only non-main-thread callers need to lock
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// it here.
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bool isMainThread = NS_IsMainThread();
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if (!isMainThread) {
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gfxPlatformFontList::PlatformFontList()->Lock();
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}
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uint32_t blockIndex = Block();
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// If the Pointer refers to a block we have not yet mapped in this process,
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// we first need to retrieve new block handle(s) from the parent and update
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// our mBlocks list.
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auto& blocks = aFontList->mBlocks;
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if (blockIndex >= blocks.Length()) {
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if (MOZ_UNLIKELY(XRE_IsParentProcess())) {
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// Shouldn't happen! A content process tried to pass a bad Pointer?
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goto cleanup;
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}
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// If we're not on the main thread, we can't do the IPC involved in
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// UpdateShmBlocks; just let the lookup fail for now.
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if (!isMainThread) {
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goto cleanup;
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}
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// UpdateShmBlocks can fail, if the parent has replaced the font list with
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// a new generation. In that case we just return null, and whatever font
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// the content process was trying to use will appear unusable for now. It's
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// about to receive a notification of the new font list anyhow, at which
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// point it will flush its caches and reflow everything, so the temporary
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// failure of this font will be forgotten.
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// UpdateShmBlocks will take the platform font-list lock during the update.
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if (MOZ_UNLIKELY(!aFontList->UpdateShmBlocks(true))) {
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goto cleanup;
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}
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MOZ_ASSERT(blockIndex < blocks.Length(), "failure in UpdateShmBlocks?");
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// This is wallpapering bug 1667977; it's unclear if we will always survive
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// this, as the content process may be unable to shape/render text if all
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// font lookups are failing.
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// In at least some cases, however, this can occur transiently while the
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// font list is being rebuilt by the parent; content will then be notified
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// that the list has changed, and should refresh everything successfully.
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if (MOZ_UNLIKELY(blockIndex >= blocks.Length())) {
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goto cleanup;
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}
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}
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{
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// Don't create a pointer that's outside what the block has allocated!
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const auto& block = blocks[blockIndex];
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if (MOZ_LIKELY(Offset() + aSize <= block->Allocated())) {
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result = static_cast<char*>(block->Memory()) + Offset();
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}
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}
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cleanup:
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if (!isMainThread) {
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gfxPlatformFontList::PlatformFontList()->Unlock();
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}
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return result;
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}
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void String::Assign(const nsACString& aString, FontList* aList) {
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// We only assign to previously-empty strings; they are never modified
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// after initial assignment.
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MOZ_ASSERT(mPointer.IsNull());
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mLength = aString.Length();
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mPointer = aList->Alloc(mLength + 1);
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auto* p = mPointer.ToArray<char>(aList, mLength);
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std::memcpy(p, aString.BeginReading(), mLength);
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p[mLength] = '\0';
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}
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Family::Family(FontList* aList, const InitData& aData)
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: mFaceCount(0),
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mKey(aList, aData.mKey),
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mName(aList, aData.mName),
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mCharacterMap(Pointer::Null()),
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mFaces(Pointer::Null()),
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mIndex(aData.mIndex),
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mVisibility(aData.mVisibility),
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mIsSimple(false),
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mIsBundled(aData.mBundled),
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mIsBadUnderlineFamily(aData.mBadUnderline),
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mIsForceClassic(aData.mForceClassic),
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mIsAltLocale(aData.mAltLocale) {}
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class SetCharMapRunnable : public mozilla::Runnable {
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public:
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SetCharMapRunnable(uint32_t aListGeneration,
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std::pair<uint32_t, bool> aFamilyIndex,
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uint32_t aFaceIndex, gfxCharacterMap* aCharMap)
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: Runnable("SetCharMapRunnable"),
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mListGeneration(aListGeneration),
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mFamilyIndex(aFamilyIndex),
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mFaceIndex(aFaceIndex),
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mCharMap(aCharMap) {}
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NS_IMETHOD Run() override {
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auto* list = gfxPlatformFontList::PlatformFontList()->SharedFontList();
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if (!list || list->GetGeneration() != mListGeneration) {
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return NS_OK;
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}
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dom::ContentChild::GetSingleton()->SendSetCharacterMap(
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mListGeneration, mFamilyIndex.first, mFamilyIndex.second, mFaceIndex,
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*mCharMap);
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return NS_OK;
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}
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private:
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uint32_t mListGeneration;
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std::pair<uint32_t, bool> mFamilyIndex;
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uint32_t mFaceIndex;
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RefPtr<gfxCharacterMap> mCharMap;
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};
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void Face::SetCharacterMap(FontList* aList, gfxCharacterMap* aCharMap,
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const Family* aFamily) {
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if (!XRE_IsParentProcess()) {
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Maybe<std::pair<uint32_t, bool>> familyIndex = aFamily->FindIndex(aList);
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if (!familyIndex) {
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NS_WARNING("Family index not found! Ignoring SetCharacterMap");
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return;
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}
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const auto* faces = aFamily->Faces(aList);
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uint32_t faceIndex = 0;
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while (faceIndex < aFamily->NumFaces()) {
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if (faces[faceIndex].ToPtr<Face>(aList) == this) {
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break;
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}
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++faceIndex;
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}
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if (faceIndex >= aFamily->NumFaces()) {
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NS_WARNING("Face not found in family! Ignoring SetCharacterMap");
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return;
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}
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if (NS_IsMainThread()) {
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dom::ContentChild::GetSingleton()->SendSetCharacterMap(
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aList->GetGeneration(), familyIndex->first, familyIndex->second,
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faceIndex, *aCharMap);
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} else {
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NS_DispatchToMainThread(new SetCharMapRunnable(
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aList->GetGeneration(), familyIndex.value(), faceIndex, aCharMap));
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}
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return;
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}
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auto pfl = gfxPlatformFontList::PlatformFontList();
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mCharacterMap = pfl->GetShmemCharMap(aCharMap);
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}
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void Family::AddFaces(FontList* aList, const nsTArray<Face::InitData>& aFaces) {
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MOZ_ASSERT(XRE_IsParentProcess());
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if (mFaceCount > 0) {
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// Already initialized!
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return;
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}
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uint32_t count = aFaces.Length();
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bool isSimple = false;
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// A family is "simple" (i.e. simplified style selection may be used instead
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// of the full CSS font-matching algorithm) if there is at maximum one normal,
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// bold, italic, and bold-italic face; in this case, they are stored at known
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// positions in the mFaces array.
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const Face::InitData* slots[4] = {nullptr, nullptr, nullptr, nullptr};
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if (count >= 2 && count <= 4) {
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// Check if this can be treated as a "simple" family
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isSimple = true;
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for (const auto& f : aFaces) {
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if (!f.mWeight.IsSingle() || !f.mStretch.IsSingle() ||
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!f.mStyle.IsSingle()) {
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isSimple = false;
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break;
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}
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if (!f.mStretch.Min().IsNormal()) {
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isSimple = false;
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break;
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}
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// Figure out which slot (0-3) this face belongs in
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size_t slot = 0;
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static_assert((kBoldMask | kItalicMask) == 0b11, "bad bold/italic bits");
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if (f.mWeight.Min().IsBold()) {
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slot |= kBoldMask;
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}
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if (f.mStyle.Min().IsItalic() || f.mStyle.Min().IsOblique()) {
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slot |= kItalicMask;
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}
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if (slots[slot]) {
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// More than one face mapped to the same slot - not a simple family!
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isSimple = false;
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break;
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}
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slots[slot] = &f;
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}
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if (isSimple) {
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// Ensure all 4 slots will exist, even if some are empty.
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count = 4;
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}
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}
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// Allocate space for the face records, and initialize them.
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// coverity[suspicious_sizeof]
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Pointer p = aList->Alloc(count * sizeof(Pointer));
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auto* facePtrs = p.ToArray<Pointer>(aList, count);
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for (size_t i = 0; i < count; i++) {
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if (isSimple && !slots[i]) {
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facePtrs[i] = Pointer::Null();
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} else {
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const auto* initData = isSimple ? slots[i] : &aFaces[i];
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Pointer fp = aList->Alloc(sizeof(Face));
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auto* face = fp.ToPtr<Face>(aList);
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(void)new (face) Face(aList, *initData);
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facePtrs[i] = fp;
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if (initData->mCharMap) {
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face->SetCharacterMap(aList, initData->mCharMap, this);
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}
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}
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}
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mIsSimple = isSimple;
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mFaces = p;
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mFaceCount.store(count);
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if (LOG_FONTLIST_ENABLED()) {
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const nsCString& fam = DisplayName().AsString(aList);
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for (unsigned j = 0; j < aFaces.Length(); j++) {
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nsAutoCString weight, style, stretch;
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aFaces[j].mWeight.ToString(weight);
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aFaces[j].mStyle.ToString(style);
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aFaces[j].mStretch.ToString(stretch);
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LOG_FONTLIST(
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("(shared-fontlist) family (%s) added face (%s) index %u, weight "
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"%s, style %s, stretch %s",
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fam.get(), aFaces[j].mDescriptor.get(), aFaces[j].mIndex,
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weight.get(), style.get(), stretch.get()));
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}
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}
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}
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bool Family::FindAllFacesForStyleInternal(FontList* aList,
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const gfxFontStyle& aStyle,
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nsTArray<Face*>& aFaceList) const {
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MOZ_ASSERT(aFaceList.IsEmpty());
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if (!IsInitialized()) {
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return false;
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}
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Pointer* facePtrs = Faces(aList);
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if (!facePtrs) {
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return false;
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}
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// Depending on the kind of family, we have to do varying amounts of work
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// to figure out what face(s) to use for the requested style properties.
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// If the family has only one face, we simply use it; no further style
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// checking needed. (However, for bitmap fonts we may still need to check
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// whether the size is acceptable.)
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if (NumFaces() == 1) {
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MOZ_ASSERT(!facePtrs[0].IsNull());
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auto* face = facePtrs[0].ToPtr<Face>(aList);
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if (face && face->HasValidDescriptor()) {
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aFaceList.AppendElement(face);
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#ifdef MOZ_WIDGET_GTK
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if (face->mSize) {
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return true;
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}
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#endif
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}
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return false;
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}
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// Most families are "simple", having just Regular/Bold/Italic/BoldItalic,
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// or some subset of these. In this case, we have exactly 4 entries in
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// mAvailableFonts, stored in the above order; note that some of the entries
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// may be nullptr. We can then pick the required entry based on whether the
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// request is for bold or non-bold, italic or non-italic, without running
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// the more complex matching algorithm used for larger families with many
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// weights and/or widths.
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if (mIsSimple) {
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// Family has no more than the "standard" 4 faces, at fixed indexes;
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// calculate which one we want.
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// Note that we cannot simply return it as not all 4 faces are necessarily
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// present.
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bool wantBold = aStyle.weight.IsBold();
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bool wantItalic = !aStyle.style.IsNormal();
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uint8_t faceIndex =
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(wantItalic ? kItalicMask : 0) | (wantBold ? kBoldMask : 0);
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// If the desired style is available, use it directly.
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auto* face = facePtrs[faceIndex].ToPtr<Face>(aList);
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if (face && face->HasValidDescriptor()) {
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aFaceList.AppendElement(face);
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#ifdef MOZ_WIDGET_GTK
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if (face->mSize) {
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return true;
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}
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#endif
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return false;
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}
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// Order to check fallback faces in a simple family, depending on the
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// requested style.
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static const uint8_t simpleFallbacks[4][3] = {
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{kBoldFaceIndex, kItalicFaceIndex,
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kBoldItalicFaceIndex}, // fallback sequence for Regular
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{kRegularFaceIndex, kBoldItalicFaceIndex, kItalicFaceIndex}, // Bold
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{kBoldItalicFaceIndex, kRegularFaceIndex, kBoldFaceIndex}, // Italic
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{kItalicFaceIndex, kBoldFaceIndex, kRegularFaceIndex} // BoldItalic
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};
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const uint8_t* order = simpleFallbacks[faceIndex];
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for (uint8_t trial = 0; trial < 3; ++trial) {
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// check remaining faces in order of preference to find the first that
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// actually exists
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face = facePtrs[order[trial]].ToPtr<Face>(aList);
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if (face && face->HasValidDescriptor()) {
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aFaceList.AppendElement(face);
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#ifdef MOZ_WIDGET_GTK
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if (face->mSize) {
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return true;
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}
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#endif
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return false;
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}
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}
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// We can only reach here if we failed to resolve the face pointer, which
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// can happen if we're on a stylo thread and caught the font list being
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// updated; in that case we just fail quietly and let font fallback do
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// something for the time being.
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return false;
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}
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// Pick the font(s) that are closest to the desired weight, style, and
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// stretch. Iterate over all fonts, measuring the weight/style distance.
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// Because of unicode-range values, there may be more than one font for a
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// given but the 99% use case is only a single font entry per
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// weight/style/stretch distance value. To optimize this, only add entries
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// to the matched font array when another entry already has the same
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// weight/style/stretch distance and add the last matched font entry. For
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// normal platform fonts with a single font entry for each
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// weight/style/stretch combination, only the last matched font entry will
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// be added.
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double minDistance = INFINITY;
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Face* matched = nullptr;
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// Keep track of whether we've included any non-scalable font resources in
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// the selected set.
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bool anyNonScalable = false;
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for (uint32_t i = 0; i < NumFaces(); i++) {
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auto* face = facePtrs[i].ToPtr<Face>(aList);
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if (face) {
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// weight/style/stretch priority: stretch >> style >> weight
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double distance = WSSDistance(face, aStyle);
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if (distance < minDistance) {
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matched = face;
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if (!aFaceList.IsEmpty()) {
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aFaceList.Clear();
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}
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minDistance = distance;
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} else if (distance == minDistance) {
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if (matched) {
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aFaceList.AppendElement(matched);
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#ifdef MOZ_WIDGET_GTK
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if (matched->mSize) {
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anyNonScalable = true;
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}
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#endif
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}
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matched = face;
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}
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}
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}
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MOZ_ASSERT(matched, "didn't match a font within a family");
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if (matched) {
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aFaceList.AppendElement(matched);
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#ifdef MOZ_WIDGET_GTK
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if (matched->mSize) {
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anyNonScalable = true;
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}
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#endif
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}
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return anyNonScalable;
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}
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void Family::FindAllFacesForStyle(FontList* aList, const gfxFontStyle& aStyle,
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nsTArray<Face*>& aFaceList,
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bool aIgnoreSizeTolerance) const {
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#ifdef MOZ_WIDGET_GTK
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bool anyNonScalable =
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#else
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Unused <<
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#endif
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FindAllFacesForStyleInternal(aList, aStyle, aFaceList);
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|
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#ifdef MOZ_WIDGET_GTK
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// aFaceList now contains whatever faces are the best style match for
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// the requested style. If specifically-sized bitmap faces are supported,
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// we need to additionally filter the list to choose the appropriate size.
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//
|
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// It would be slightly more efficient to integrate this directly into the
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// face-selection algorithm above, but it's a rare case that doesn't apply
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// at all to most font families.
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//
|
|
// Currently we only support pixel-sized bitmap font faces on Linux/Gtk (i.e.
|
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// when using the gfxFcPlatformFontList implementation), so this filtering is
|
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// not needed on other platforms.
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//
|
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// (Note that color-bitmap emoji fonts like Apple Color Emoji or Noto Color
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// Emoji don't count here; they package multiple bitmap sizes into a single
|
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// OpenType wrapper, so they appear as a single "scalable" face in our list.)
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if (anyNonScalable) {
|
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uint16_t best = 0;
|
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gfxFloat dist = 0.0;
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for (const auto& f : aFaceList) {
|
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if (f->mSize == 0) {
|
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// Scalable face; no size distance to compute.
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continue;
|
|
}
|
|
gfxFloat d = fabs(gfxFloat(f->mSize) - aStyle.size);
|
|
if (!aIgnoreSizeTolerance && (d * 5.0 > f->mSize)) {
|
|
continue; // Too far from the requested size, ignore.
|
|
}
|
|
// If we haven't found a "best" bitmap size yet, or if this is a better
|
|
// match, remember it.
|
|
if (!best || d < dist) {
|
|
best = f->mSize;
|
|
dist = d;
|
|
}
|
|
}
|
|
// Discard all faces except the chosen "best" size; or if no pixel size was
|
|
// chosen, all except scalable faces.
|
|
// This may eliminate *all* faces in the family, if all were bitmaps and
|
|
// none was a good enough size match, in which case we'll fall back to the
|
|
// next font-family name.
|
|
aFaceList.RemoveElementsBy([=](const auto& e) { return e->mSize != best; });
|
|
}
|
|
#endif
|
|
}
|
|
|
|
Face* Family::FindFaceForStyle(FontList* aList, const gfxFontStyle& aStyle,
|
|
bool aIgnoreSizeTolerance) const {
|
|
AutoTArray<Face*, 4> faces;
|
|
FindAllFacesForStyle(aList, aStyle, faces, aIgnoreSizeTolerance);
|
|
return faces.IsEmpty() ? nullptr : faces[0];
|
|
}
|
|
|
|
void Family::SearchAllFontsForChar(FontList* aList,
|
|
GlobalFontMatch* aMatchData) {
|
|
auto* charmap = mCharacterMap.ToPtr<const SharedBitSet>(aList);
|
|
if (!charmap) {
|
|
// If the face list is not yet initialized, or if character maps have
|
|
// not been loaded, go ahead and do this now (by sending a message to the
|
|
// parent process, if we're running in a child).
|
|
// After this, all faces should have their mCharacterMap set up, and the
|
|
// family's mCharacterMap should also be set; but in the code below we
|
|
// don't assume this all succeeded, so it still checks.
|
|
if (!gfxPlatformFontList::PlatformFontList()->InitializeFamily(this,
|
|
true)) {
|
|
return;
|
|
}
|
|
charmap = mCharacterMap.ToPtr<const SharedBitSet>(aList);
|
|
}
|
|
if (charmap && !charmap->test(aMatchData->mCh)) {
|
|
return;
|
|
}
|
|
|
|
uint32_t numFaces = NumFaces();
|
|
uint32_t charMapsLoaded = 0; // number of faces whose charmap is loaded
|
|
Pointer* facePtrs = Faces(aList);
|
|
if (!facePtrs) {
|
|
return;
|
|
}
|
|
for (uint32_t i = 0; i < numFaces; i++) {
|
|
auto* face = facePtrs[i].ToPtr<Face>(aList);
|
|
if (!face) {
|
|
continue;
|
|
}
|
|
MOZ_ASSERT(face->HasValidDescriptor());
|
|
// Get the face's character map, if available (may be null!)
|
|
charmap = face->mCharacterMap.ToPtr<const SharedBitSet>(aList);
|
|
if (charmap) {
|
|
++charMapsLoaded;
|
|
}
|
|
// Check style distance if the char is supported, or if charmap not known
|
|
// (so that we don't trigger cmap-loading for faces that would be a worse
|
|
// match than what we've already found).
|
|
if (!charmap || charmap->test(aMatchData->mCh)) {
|
|
double distance = WSSDistance(face, aMatchData->mStyle);
|
|
if (distance < aMatchData->mMatchDistance) {
|
|
// It's a better style match: get a fontEntry, and if we haven't
|
|
// already checked character coverage, do it now (note that
|
|
// HasCharacter() will trigger loading the fontEntry's cmap, if
|
|
// needed).
|
|
RefPtr<gfxFontEntry> fe =
|
|
gfxPlatformFontList::PlatformFontList()->GetOrCreateFontEntry(face,
|
|
this);
|
|
if (!fe) {
|
|
continue;
|
|
}
|
|
if (!charmap && !fe->HasCharacter(aMatchData->mCh)) {
|
|
continue;
|
|
}
|
|
if (aMatchData->mPresentation != eFontPresentation::Any) {
|
|
RefPtr<gfxFont> font = fe->FindOrMakeFont(&aMatchData->mStyle);
|
|
if (!font) {
|
|
continue;
|
|
}
|
|
bool hasColorGlyph =
|
|
font->HasColorGlyphFor(aMatchData->mCh, aMatchData->mNextCh);
|
|
if (hasColorGlyph != PrefersColor(aMatchData->mPresentation)) {
|
|
distance += kPresentationMismatch;
|
|
if (distance >= aMatchData->mMatchDistance) {
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
aMatchData->mBestMatch = fe;
|
|
aMatchData->mMatchDistance = distance;
|
|
aMatchData->mMatchedSharedFamily = this;
|
|
}
|
|
}
|
|
}
|
|
if (mCharacterMap.IsNull() && charMapsLoaded == numFaces) {
|
|
SetupFamilyCharMap(aList);
|
|
}
|
|
}
|
|
|
|
void Family::SetFacePtrs(FontList* aList, nsTArray<Pointer>& aFaces) {
|
|
if (aFaces.Length() >= 2 && aFaces.Length() <= 4) {
|
|
// Check whether the faces meet the criteria for a "simple" family: no more
|
|
// than one each of Regular, Bold, Italic, BoldItalic styles. If so, store
|
|
// them at the appropriate slots in mFaces and set the mIsSimple flag to
|
|
// accelerate font-matching.
|
|
bool isSimple = true;
|
|
Pointer slots[4] = {Pointer::Null(), Pointer::Null(), Pointer::Null(),
|
|
Pointer::Null()};
|
|
for (const Pointer& fp : aFaces) {
|
|
auto* f = fp.ToPtr<const Face>(aList);
|
|
if (!f->mWeight.IsSingle() || !f->mStyle.IsSingle() ||
|
|
!f->mStretch.IsSingle()) {
|
|
isSimple = false;
|
|
break;
|
|
}
|
|
if (!f->mStretch.Min().IsNormal()) {
|
|
isSimple = false;
|
|
break;
|
|
}
|
|
size_t slot = 0;
|
|
if (f->mWeight.Min().IsBold()) {
|
|
slot |= kBoldMask;
|
|
}
|
|
if (f->mStyle.Min().IsItalic() || f->mStyle.Min().IsOblique()) {
|
|
slot |= kItalicMask;
|
|
}
|
|
if (!slots[slot].IsNull()) {
|
|
isSimple = false;
|
|
break;
|
|
}
|
|
slots[slot] = fp;
|
|
}
|
|
if (isSimple) {
|
|
size_t size = 4 * sizeof(Pointer);
|
|
mFaces = aList->Alloc(size);
|
|
memcpy(mFaces.ToPtr(aList, size), slots, size);
|
|
mFaceCount.store(4);
|
|
mIsSimple = true;
|
|
return;
|
|
}
|
|
}
|
|
size_t size = aFaces.Length() * sizeof(Pointer);
|
|
mFaces = aList->Alloc(size);
|
|
memcpy(mFaces.ToPtr(aList, size), aFaces.Elements(), size);
|
|
mFaceCount.store(aFaces.Length());
|
|
}
|
|
|
|
void Family::SetupFamilyCharMap(FontList* aList) {
|
|
// Set the character map of the family to the union of all the face cmaps,
|
|
// to allow font fallback searches to more rapidly reject the family.
|
|
if (!mCharacterMap.IsNull()) {
|
|
return;
|
|
}
|
|
if (!XRE_IsParentProcess()) {
|
|
// |this| could be a Family record in either the Families() or Aliases()
|
|
// arrays; FindIndex will map it back to its index and which array.
|
|
Maybe<std::pair<uint32_t, bool>> index = FindIndex(aList);
|
|
if (!index) {
|
|
NS_WARNING("Family index not found! Ignoring SetupFamilyCharMap");
|
|
return;
|
|
}
|
|
if (NS_IsMainThread()) {
|
|
dom::ContentChild::GetSingleton()->SendSetupFamilyCharMap(
|
|
aList->GetGeneration(), index->first, index->second);
|
|
return;
|
|
}
|
|
NS_DispatchToMainThread(NS_NewRunnableFunction(
|
|
"SetupFamilyCharMap callback",
|
|
[gen = aList->GetGeneration(), idx = index->first,
|
|
alias = index->second] {
|
|
dom::ContentChild::GetSingleton()->SendSetupFamilyCharMap(gen, idx,
|
|
alias);
|
|
}));
|
|
return;
|
|
}
|
|
gfxSparseBitSet familyMap;
|
|
Pointer firstMapShmPointer;
|
|
const SharedBitSet* firstMap = nullptr;
|
|
bool merged = false;
|
|
Pointer* faces = Faces(aList);
|
|
if (!faces) {
|
|
return;
|
|
}
|
|
for (size_t i = 0; i < NumFaces(); i++) {
|
|
auto* f = faces[i].ToPtr<const Face>(aList);
|
|
if (!f) {
|
|
continue; // Skip missing face (in an incomplete "simple" family)
|
|
}
|
|
auto* faceMap = f->mCharacterMap.ToPtr<const SharedBitSet>(aList);
|
|
if (!faceMap) {
|
|
continue; // If there's a face where setting up the cmap failed, we skip
|
|
// it as unusable.
|
|
}
|
|
if (!firstMap) {
|
|
firstMap = faceMap;
|
|
firstMapShmPointer = f->mCharacterMap;
|
|
} else if (faceMap != firstMap) {
|
|
if (!merged) {
|
|
familyMap.Union(*firstMap);
|
|
merged = true;
|
|
}
|
|
familyMap.Union(*faceMap);
|
|
}
|
|
}
|
|
// If we created a merged cmap, we need to save that on the family; or if we
|
|
// found no usable cmaps at all, we need to store the empty familyMap so that
|
|
// we won't repeatedly attempt this for an unusable family.
|
|
if (merged || firstMapShmPointer.IsNull()) {
|
|
mCharacterMap =
|
|
gfxPlatformFontList::PlatformFontList()->GetShmemCharMap(&familyMap);
|
|
} else {
|
|
// If all [usable] faces had the same cmap, we can just share it.
|
|
mCharacterMap = firstMapShmPointer;
|
|
}
|
|
}
|
|
|
|
Maybe<std::pair<uint32_t, bool>> Family::FindIndex(FontList* aList) const {
|
|
const auto* start = aList->Families();
|
|
const auto* end = start + aList->NumFamilies();
|
|
if (this >= start && this < end) {
|
|
uint32_t index = this - start;
|
|
MOZ_RELEASE_ASSERT(start + index == this, "misaligned Family ptr!");
|
|
return Some(std::pair(index, false));
|
|
}
|
|
|
|
start = aList->AliasFamilies();
|
|
end = start + aList->NumAliases();
|
|
if (this >= start && this < end) {
|
|
uint32_t index = this - start;
|
|
MOZ_RELEASE_ASSERT(start + index == this, "misaligned AliasFamily ptr!");
|
|
return Some(std::pair(index, true));
|
|
}
|
|
|
|
return Nothing();
|
|
}
|
|
|
|
FontList::FontList(uint32_t aGeneration) {
|
|
if (XRE_IsParentProcess()) {
|
|
// Create the initial shared block, and initialize Header
|
|
if (AppendShmBlock(SHM_BLOCK_SIZE)) {
|
|
Header& header = GetHeader();
|
|
header.mBlockHeader.mAllocated.store(sizeof(Header));
|
|
header.mGeneration = aGeneration;
|
|
header.mFamilyCount = 0;
|
|
header.mBlockCount.store(1);
|
|
header.mAliasCount.store(0);
|
|
header.mLocalFaceCount.store(0);
|
|
header.mFamilies = Pointer::Null();
|
|
header.mAliases = Pointer::Null();
|
|
header.mLocalFaces = Pointer::Null();
|
|
} else {
|
|
MOZ_CRASH("parent: failed to initialize FontList");
|
|
}
|
|
} else {
|
|
// Initialize using the list of shmem blocks passed by the parent via
|
|
// SetXPCOMProcessAttributes.
|
|
auto& blocks = dom::ContentChild::GetSingleton()->SharedFontListBlocks();
|
|
for (auto& handle : blocks) {
|
|
auto newShm = MakeUnique<base::SharedMemory>();
|
|
if (!newShm->IsHandleValid(handle)) {
|
|
// Bail out and let UpdateShmBlocks try to do its thing below.
|
|
break;
|
|
}
|
|
if (!newShm->SetHandle(std::move(handle), true)) {
|
|
MOZ_CRASH("failed to set shm handle");
|
|
}
|
|
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
uint32_t size = static_cast<BlockHeader*>(newShm->memory())->mBlockSize;
|
|
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
|
|
if (size != SHM_BLOCK_SIZE) {
|
|
newShm->Unmap();
|
|
if (!newShm->Map(size) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
}
|
|
mBlocks.AppendElement(new ShmBlock(std::move(newShm)));
|
|
}
|
|
blocks.Clear();
|
|
// Update in case of any changes since the initial message was sent.
|
|
for (unsigned retryCount = 0; retryCount < 3; ++retryCount) {
|
|
if (UpdateShmBlocks(false)) {
|
|
return;
|
|
}
|
|
// The only reason for UpdateShmBlocks to fail is if the parent recreated
|
|
// the list after we read its first block, but before we finished getting
|
|
// them all, and so the generation check failed on a subsequent request.
|
|
// Discarding whatever we've got and retrying should get us a new,
|
|
// consistent set of memory blocks in this case. If this doesn't work
|
|
// after a couple of retries, bail out.
|
|
DetachShmBlocks();
|
|
}
|
|
NS_WARNING("child: failed to initialize shared FontList");
|
|
}
|
|
}
|
|
|
|
FontList::~FontList() { DetachShmBlocks(); }
|
|
|
|
FontList::Header& FontList::GetHeader() const MOZ_NO_THREAD_SAFETY_ANALYSIS {
|
|
// We only need to lock if we're not on the main thread.
|
|
bool isMainThread = NS_IsMainThread();
|
|
if (!isMainThread) {
|
|
gfxPlatformFontList::PlatformFontList()->Lock();
|
|
}
|
|
|
|
// It's invalid to try and access this before the first block exists.
|
|
MOZ_ASSERT(mBlocks.Length() > 0);
|
|
auto& result = *static_cast<Header*>(mBlocks[0]->Memory());
|
|
|
|
if (!isMainThread) {
|
|
gfxPlatformFontList::PlatformFontList()->Unlock();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
bool FontList::AppendShmBlock(uint32_t aSizeNeeded) {
|
|
MOZ_ASSERT(XRE_IsParentProcess());
|
|
uint32_t size = std::max(aSizeNeeded, SHM_BLOCK_SIZE);
|
|
auto newShm = MakeUnique<base::SharedMemory>();
|
|
if (!newShm->CreateFreezeable(size)) {
|
|
MOZ_CRASH("failed to create shared memory");
|
|
return false;
|
|
}
|
|
if (!newShm->Map(size) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
return false;
|
|
}
|
|
auto readOnly = MakeUnique<base::SharedMemory>();
|
|
if (!newShm->ReadOnlyCopy(readOnly.get())) {
|
|
MOZ_CRASH("failed to create read-only copy");
|
|
return false;
|
|
}
|
|
|
|
ShmBlock* block = new ShmBlock(std::move(newShm));
|
|
block->StoreAllocated(sizeof(BlockHeader));
|
|
block->BlockSize() = size;
|
|
|
|
mBlocks.AppendElement(block);
|
|
GetHeader().mBlockCount.store(mBlocks.Length());
|
|
|
|
mReadOnlyShmems.AppendElement(std::move(readOnly));
|
|
|
|
// We don't need to broadcast the addition of the initial block,
|
|
// because child processes can't have initialized their list at all
|
|
// prior to the first block being set up.
|
|
if (mBlocks.Length() > 1) {
|
|
if (NS_IsMainThread()) {
|
|
dom::ContentParent::BroadcastShmBlockAdded(GetGeneration(),
|
|
mBlocks.Length() - 1);
|
|
} else {
|
|
NS_DispatchToMainThread(NS_NewRunnableFunction(
|
|
"ShmBlockAdded callback",
|
|
[generation = GetGeneration(), index = mBlocks.Length() - 1] {
|
|
dom::ContentParent::BroadcastShmBlockAdded(generation, index);
|
|
}));
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void FontList::ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
|
|
base::SharedMemoryHandle aHandle) {
|
|
MOZ_ASSERT(!XRE_IsParentProcess());
|
|
MOZ_ASSERT(mBlocks.Length() > 0);
|
|
|
|
auto newShm = MakeUnique<base::SharedMemory>();
|
|
if (!newShm->IsHandleValid(aHandle)) {
|
|
return;
|
|
}
|
|
if (!newShm->SetHandle(std::move(aHandle), true)) {
|
|
MOZ_CRASH("failed to set shm handle");
|
|
}
|
|
|
|
if (aIndex != mBlocks.Length()) {
|
|
return;
|
|
}
|
|
if (aGeneration != GetGeneration()) {
|
|
return;
|
|
}
|
|
|
|
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
|
|
uint32_t size = static_cast<BlockHeader*>(newShm->memory())->mBlockSize;
|
|
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
|
|
if (size != SHM_BLOCK_SIZE) {
|
|
newShm->Unmap();
|
|
if (!newShm->Map(size) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
}
|
|
|
|
mBlocks.AppendElement(new ShmBlock(std::move(newShm)));
|
|
}
|
|
|
|
void FontList::DetachShmBlocks() {
|
|
for (auto& i : mBlocks) {
|
|
i->mShmem = nullptr;
|
|
}
|
|
mBlocks.Clear();
|
|
mReadOnlyShmems.Clear();
|
|
}
|
|
|
|
FontList::ShmBlock* FontList::GetBlockFromParent(uint32_t aIndex) {
|
|
MOZ_ASSERT(!XRE_IsParentProcess());
|
|
// If we have no existing blocks, we don't want a generation check yet;
|
|
// the header in the first block will define the generation of this list
|
|
uint32_t generation = aIndex == 0 ? 0 : GetGeneration();
|
|
base::SharedMemoryHandle handle = base::SharedMemory::NULLHandle();
|
|
if (!dom::ContentChild::GetSingleton()->SendGetFontListShmBlock(
|
|
generation, aIndex, &handle)) {
|
|
return nullptr;
|
|
}
|
|
auto newShm = MakeUnique<base::SharedMemory>();
|
|
if (!newShm->IsHandleValid(handle)) {
|
|
return nullptr;
|
|
}
|
|
if (!newShm->SetHandle(std::move(handle), true)) {
|
|
MOZ_CRASH("failed to set shm handle");
|
|
}
|
|
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
uint32_t size = static_cast<BlockHeader*>(newShm->memory())->mBlockSize;
|
|
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
|
|
if (size != SHM_BLOCK_SIZE) {
|
|
newShm->Unmap();
|
|
if (!newShm->Map(size) || !newShm->memory()) {
|
|
MOZ_CRASH("failed to map shared memory");
|
|
}
|
|
}
|
|
return new ShmBlock(std::move(newShm));
|
|
}
|
|
|
|
// We don't take the lock when called from the constructor, so disable thread-
|
|
// safety analysis here.
|
|
bool FontList::UpdateShmBlocks(bool aMustLock) MOZ_NO_THREAD_SAFETY_ANALYSIS {
|
|
MOZ_ASSERT(!XRE_IsParentProcess());
|
|
if (aMustLock) {
|
|
gfxPlatformFontList::PlatformFontList()->Lock();
|
|
}
|
|
bool result = true;
|
|
while (!mBlocks.Length() || mBlocks.Length() < GetHeader().mBlockCount) {
|
|
ShmBlock* newBlock = GetBlockFromParent(mBlocks.Length());
|
|
if (!newBlock) {
|
|
result = false;
|
|
break;
|
|
}
|
|
mBlocks.AppendElement(newBlock);
|
|
}
|
|
if (aMustLock) {
|
|
gfxPlatformFontList::PlatformFontList()->Unlock();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void FontList::ShareBlocksToProcess(nsTArray<base::SharedMemoryHandle>* aBlocks,
|
|
base::ProcessId aPid) {
|
|
MOZ_RELEASE_ASSERT(mReadOnlyShmems.Length() == mBlocks.Length());
|
|
for (auto& shmem : mReadOnlyShmems) {
|
|
auto handle = shmem->CloneHandle();
|
|
if (!handle) {
|
|
// If something went wrong here, we just bail out; the child will need to
|
|
// request the blocks as needed, at some performance cost. (Although in
|
|
// practice this may mean resources are so constrained the child process
|
|
// isn't really going to work at all. But that's not our problem here.)
|
|
aBlocks->Clear();
|
|
return;
|
|
}
|
|
aBlocks->AppendElement(std::move(handle));
|
|
}
|
|
}
|
|
|
|
base::SharedMemoryHandle FontList::ShareBlockToProcess(uint32_t aIndex,
|
|
base::ProcessId aPid) {
|
|
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
|
|
MOZ_RELEASE_ASSERT(mReadOnlyShmems.Length() == mBlocks.Length());
|
|
MOZ_RELEASE_ASSERT(aIndex < mReadOnlyShmems.Length());
|
|
|
|
return mReadOnlyShmems[aIndex]->CloneHandle();
|
|
}
|
|
|
|
Pointer FontList::Alloc(uint32_t aSize) {
|
|
// Only the parent process does allocation.
|
|
MOZ_ASSERT(XRE_IsParentProcess());
|
|
|
|
// 4-byte alignment is good enough for anything we allocate in the font list,
|
|
// as our "Pointer" (block index/offset) is a 32-bit value even on x64.
|
|
auto align = [](uint32_t aSize) -> size_t { return (aSize + 3u) & ~3u; };
|
|
|
|
aSize = align(aSize);
|
|
|
|
int32_t blockIndex = -1;
|
|
uint32_t curAlloc, size;
|
|
|
|
if (aSize < SHM_BLOCK_SIZE - sizeof(BlockHeader)) {
|
|
// Try to allocate in the most recently added block first, as this is
|
|
// highly likely to succeed; if not, try earlier blocks (to fill gaps).
|
|
const int32_t blockCount = mBlocks.Length();
|
|
for (blockIndex = blockCount - 1; blockIndex >= 0; --blockIndex) {
|
|
size = mBlocks[blockIndex]->BlockSize();
|
|
curAlloc = mBlocks[blockIndex]->Allocated();
|
|
if (size - curAlloc >= aSize) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (blockIndex < 0) {
|
|
// Couldn't find enough space (or the requested size is too large to use
|
|
// a part of a block): create a new block.
|
|
if (!AppendShmBlock(aSize + sizeof(BlockHeader))) {
|
|
return Pointer::Null();
|
|
}
|
|
blockIndex = mBlocks.Length() - 1;
|
|
curAlloc = mBlocks[blockIndex]->Allocated();
|
|
}
|
|
|
|
// We've found a block; allocate space from it, and return
|
|
mBlocks[blockIndex]->StoreAllocated(curAlloc + aSize);
|
|
|
|
return Pointer(blockIndex, curAlloc);
|
|
}
|
|
|
|
void FontList::SetFamilyNames(nsTArray<Family::InitData>& aFamilies) {
|
|
// Only the parent process should ever assign the list of families.
|
|
MOZ_ASSERT(XRE_IsParentProcess());
|
|
|
|
Header& header = GetHeader();
|
|
MOZ_ASSERT(!header.mFamilyCount);
|
|
|
|
gfxPlatformFontList::PlatformFontList()->ApplyWhitelist(aFamilies);
|
|
aFamilies.Sort();
|
|
|
|
size_t count = aFamilies.Length();
|
|
|
|
// Any font resources with an empty family-name will have been collected in
|
|
// a family with empty name, and sorted to the start of the list. Such fonts
|
|
// are not generally usable, or recognized as "installed", so we drop them.
|
|
if (count > 1 && aFamilies[0].mKey.IsEmpty()) {
|
|
aFamilies.RemoveElementAt(0);
|
|
--count;
|
|
}
|
|
|
|
// Check for duplicate family entries (can occur if there is a bundled font
|
|
// that has the same name as a system-installed one); in this case we keep
|
|
// the bundled one as it will always be exposed.
|
|
if (count > 1) {
|
|
for (size_t i = 1; i < count; ++i) {
|
|
if (aFamilies[i].mKey.Equals(aFamilies[i - 1].mKey)) {
|
|
// Decide whether to discard the current entry or the preceding one
|
|
size_t discard =
|
|
aFamilies[i].mBundled && !aFamilies[i - 1].mBundled ? i - 1 : i;
|
|
aFamilies.RemoveElementAt(discard);
|
|
--count;
|
|
--i;
|
|
}
|
|
}
|
|
}
|
|
|
|
header.mFamilies = Alloc(count * sizeof(Family));
|
|
if (header.mFamilies.IsNull()) {
|
|
return;
|
|
}
|
|
|
|
// We can't call Families() here because the mFamilyCount field has not yet
|
|
// been set!
|
|
auto* families = header.mFamilies.ToArray<Family>(this, count);
|
|
for (size_t i = 0; i < count; i++) {
|
|
(void)new (&families[i]) Family(this, aFamilies[i]);
|
|
LOG_FONTLIST(("(shared-fontlist) family %u (%s)", (unsigned)i,
|
|
aFamilies[i].mName.get()));
|
|
}
|
|
|
|
header.mFamilyCount = count;
|
|
}
|
|
|
|
void FontList::SetAliases(
|
|
nsClassHashtable<nsCStringHashKey, AliasData>& aAliasTable) {
|
|
MOZ_ASSERT(XRE_IsParentProcess());
|
|
|
|
Header& header = GetHeader();
|
|
|
|
// Build an array of Family::InitData records based on the entries in
|
|
// aAliasTable, then sort them and store into the fontlist.
|
|
nsTArray<Family::InitData> aliasArray;
|
|
aliasArray.SetCapacity(aAliasTable.Count());
|
|
for (const auto& entry : aAliasTable) {
|
|
aliasArray.AppendElement(Family::InitData(
|
|
entry.GetKey(), entry.GetData()->mBaseFamily, entry.GetData()->mIndex,
|
|
entry.GetData()->mVisibility, entry.GetData()->mBundled,
|
|
entry.GetData()->mBadUnderline, entry.GetData()->mForceClassic, true));
|
|
}
|
|
aliasArray.Sort();
|
|
|
|
size_t count = aliasArray.Length();
|
|
|
|
// Drop any entry with empty family-name as being unusable.
|
|
if (count && aliasArray[0].mKey.IsEmpty()) {
|
|
aliasArray.RemoveElementAt(0);
|
|
--count;
|
|
}
|
|
|
|
if (count < header.mAliasCount) {
|
|
// This shouldn't happen, but handle it safely by just bailing out.
|
|
NS_WARNING("cannot reduce number of aliases");
|
|
return;
|
|
}
|
|
fontlist::Pointer ptr = Alloc(count * sizeof(Family));
|
|
auto* aliases = ptr.ToArray<Family>(this, count);
|
|
for (size_t i = 0; i < count; i++) {
|
|
(void)new (&aliases[i]) Family(this, aliasArray[i]);
|
|
LOG_FONTLIST(("(shared-fontlist) alias family %u (%s: %s)", (unsigned)i,
|
|
aliasArray[i].mKey.get(), aliasArray[i].mName.get()));
|
|
aliases[i].SetFacePtrs(this, aAliasTable.Get(aliasArray[i].mKey)->mFaces);
|
|
if (LOG_FONTLIST_ENABLED()) {
|
|
const auto& faces = aAliasTable.Get(aliasArray[i].mKey)->mFaces;
|
|
for (unsigned j = 0; j < faces.Length(); j++) {
|
|
auto* face = faces[j].ToPtr<const Face>(this);
|
|
const nsCString& desc = face->mDescriptor.AsString(this);
|
|
nsAutoCString weight, style, stretch;
|
|
face->mWeight.ToString(weight);
|
|
face->mStyle.ToString(style);
|
|
face->mStretch.ToString(stretch);
|
|
LOG_FONTLIST(
|
|
("(shared-fontlist) face (%s) index %u, weight %s, style %s, "
|
|
"stretch %s",
|
|
desc.get(), face->mIndex, weight.get(), style.get(),
|
|
stretch.get()));
|
|
}
|
|
}
|
|
}
|
|
|
|
// Set the pointer before the count, so that any other process trying to read
|
|
// will not risk out-of-bounds access to the array.
|
|
header.mAliases = ptr;
|
|
header.mAliasCount.store(count);
|
|
}
|
|
|
|
void FontList::SetLocalNames(
|
|
nsTHashMap<nsCStringHashKey, LocalFaceRec::InitData>& aLocalNameTable) {
|
|
MOZ_ASSERT(XRE_IsParentProcess());
|
|
Header& header = GetHeader();
|
|
if (header.mLocalFaceCount > 0) {
|
|
return; // already been done!
|
|
}
|
|
auto faceArray = ToTArray<nsTArray<nsCString>>(aLocalNameTable.Keys());
|
|
faceArray.Sort();
|
|
size_t count = faceArray.Length();
|
|
Family* families = Families();
|
|
fontlist::Pointer ptr = Alloc(count * sizeof(LocalFaceRec));
|
|
auto* faces = ptr.ToArray<LocalFaceRec>(this, count);
|
|
for (size_t i = 0; i < count; i++) {
|
|
(void)new (&faces[i]) LocalFaceRec();
|
|
const auto& rec = aLocalNameTable.Get(faceArray[i]);
|
|
faces[i].mKey.Assign(faceArray[i], this);
|
|
// Local face name records will refer to the canonical family name; we don't
|
|
// need to search aliases here.
|
|
const auto* family = FindFamily(rec.mFamilyName, /*aPrimaryNameOnly*/ true);
|
|
if (!family) {
|
|
// Skip this record if the family was excluded by the font whitelist pref.
|
|
continue;
|
|
}
|
|
faces[i].mFamilyIndex = family - families;
|
|
if (rec.mFaceIndex == uint32_t(-1)) {
|
|
// The InitData record contains an mFaceDescriptor rather than an index,
|
|
// so now we need to look for the appropriate index in the family.
|
|
faces[i].mFaceIndex = 0;
|
|
const Pointer* faceList =
|
|
static_cast<const Pointer*>(family->Faces(this));
|
|
for (uint32_t j = 0; j < family->NumFaces(); j++) {
|
|
if (!faceList[j].IsNull()) {
|
|
auto* f = faceList[j].ToPtr<const Face>(this);
|
|
if (f && rec.mFaceDescriptor == f->mDescriptor.AsString(this)) {
|
|
faces[i].mFaceIndex = j;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
faces[i].mFaceIndex = rec.mFaceIndex;
|
|
}
|
|
}
|
|
header.mLocalFaces = ptr;
|
|
header.mLocalFaceCount.store(count);
|
|
}
|
|
|
|
nsCString FontList::LocalizedFamilyName(const Family* aFamily) {
|
|
// If the given family was created for an alternate locale or legacy name,
|
|
// search for a standard family that corresponds to it. This is a linear
|
|
// search of the font list, but (a) this is only used to show names in
|
|
// Preferences, so is not performance-critical for layout etc.; and (b) few
|
|
// such family names are normally present anyway, the vast majority of fonts
|
|
// just have a single family name and we return it directly.
|
|
if (aFamily->IsAltLocaleFamily()) {
|
|
// Currently only the Windows backend actually does this; on other systems,
|
|
// the family index is unused and will be kNoIndex for all fonts.
|
|
if (aFamily->Index() != Family::kNoIndex) {
|
|
const Family* families = Families();
|
|
for (uint32_t i = 0; i < NumFamilies(); ++i) {
|
|
if (families[i].Index() == aFamily->Index() &&
|
|
families[i].IsBundled() == aFamily->IsBundled() &&
|
|
!families[i].IsAltLocaleFamily()) {
|
|
return families[i].DisplayName().AsString(this);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// For standard families (or if we failed to find the expected standard
|
|
// family for some reason), just return the DisplayName.
|
|
return aFamily->DisplayName().AsString(this);
|
|
}
|
|
|
|
Family* FontList::FindFamily(const nsCString& aName, bool aPrimaryNameOnly) {
|
|
struct FamilyNameComparator {
|
|
FamilyNameComparator(FontList* aList, const nsCString& aTarget)
|
|
: mList(aList), mTarget(aTarget) {}
|
|
|
|
int operator()(const Family& aVal) const {
|
|
return Compare(mTarget,
|
|
nsDependentCString(aVal.Key().BeginReading(mList)));
|
|
}
|
|
|
|
private:
|
|
FontList* mList;
|
|
const nsCString& mTarget;
|
|
};
|
|
|
|
const Header& header = GetHeader();
|
|
|
|
Family* families = Families();
|
|
if (!families) {
|
|
return nullptr;
|
|
}
|
|
|
|
size_t match;
|
|
if (BinarySearchIf(families, 0, header.mFamilyCount,
|
|
FamilyNameComparator(this, aName), &match)) {
|
|
return &families[match];
|
|
}
|
|
|
|
if (aPrimaryNameOnly) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (header.mAliasCount) {
|
|
Family* aliases = AliasFamilies();
|
|
size_t match;
|
|
if (aliases && BinarySearchIf(aliases, 0, header.mAliasCount,
|
|
FamilyNameComparator(this, aName), &match)) {
|
|
return &aliases[match];
|
|
}
|
|
}
|
|
|
|
#ifdef XP_WIN
|
|
// For Windows only, because of how DWrite munges font family names in some
|
|
// cases (see
|
|
// https://msdnshared.blob.core.windows.net/media/MSDNBlogsFS/prod.evol.blogs.msdn.com/CommunityServer.Components.PostAttachments/00/02/24/90/36/WPF%20Font%20Selection%20Model.pdf
|
|
// and discussion on the OpenType list), try stripping a possible style-name
|
|
// suffix from the end of the requested family name.
|
|
// After the deferred font loader has finished, this is no longer needed as
|
|
// the "real" family names will have been found in AliasFamilies() above.
|
|
if (aName.Contains(' ')) {
|
|
auto pfl = gfxPlatformFontList::PlatformFontList();
|
|
pfl->mLock.AssertCurrentThreadIn();
|
|
if (header.mAliasCount) {
|
|
// Aliases have been fully loaded by the parent process, so just discard
|
|
// any stray mAliasTable and mLocalNameTable entries from earlier calls
|
|
// to this code, and return.
|
|
pfl->mAliasTable.Clear();
|
|
pfl->mLocalNameTable.Clear();
|
|
mFaceNamesRead.Clear();
|
|
return nullptr;
|
|
}
|
|
|
|
// Do we already have an aliasData record for this name? If so, we just
|
|
// return its base family.
|
|
if (auto lookup = pfl->mAliasTable.Lookup(aName)) {
|
|
return FindFamily(lookup.Data()->mBaseFamily, true);
|
|
}
|
|
|
|
// Strip the style suffix (after last space in the name) to get a "base"
|
|
// family name.
|
|
const char* data = aName.BeginReading();
|
|
int32_t index = aName.Length();
|
|
while (--index > 0) {
|
|
if (data[index] == ' ') {
|
|
break;
|
|
}
|
|
}
|
|
if (index <= 0) {
|
|
return nullptr;
|
|
}
|
|
nsAutoCString base(Substring(aName, 0, index));
|
|
auto familyCount = header.mFamilyCount;
|
|
if (BinarySearchIf(families, 0, familyCount,
|
|
FamilyNameComparator(this, base), &match)) {
|
|
// Check to see if we have already read the face names for this base
|
|
// family. Note: EnsureLengthAtLeast will default new entries to false.
|
|
mFaceNamesRead.EnsureLengthAtLeast(familyCount);
|
|
if (mFaceNamesRead[match]) {
|
|
return nullptr;
|
|
}
|
|
// This may be a possible base family to satisfy the search; call
|
|
// ReadFaceNamesForFamily and see if the desired name ends up in
|
|
// mAliasTable.
|
|
// Note that ReadFaceNamesForFamily may store entries in mAliasTable
|
|
// (and mLocalNameTable), but if this is happening in a content
|
|
// process (which is the common case) those entries will not be saved
|
|
// into the shared font list; they're just used here until the "real"
|
|
// alias list is ready, then discarded.
|
|
Family* baseFamily = &families[match];
|
|
pfl->ReadFaceNamesForFamily(baseFamily, false);
|
|
mFaceNamesRead[match] = true;
|
|
if (auto lookup = pfl->mAliasTable.Lookup(aName)) {
|
|
if (lookup.Data()->mFaces.Length() != baseFamily->NumFaces()) {
|
|
// If the alias family doesn't have all the faces of the base family,
|
|
// then style matching may end up resolving to a face that isn't
|
|
// supposed to be available in the legacy styled family. To ensure
|
|
// such mis-styling will get fixed, we start the async font info
|
|
// loader (if it hasn't yet been triggered), which will pull in the
|
|
// full metadata we need and then force a reflow.
|
|
pfl->InitOtherFamilyNames(/* aDeferOtherFamilyNamesLoading */ true);
|
|
}
|
|
return baseFamily;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
LocalFaceRec* FontList::FindLocalFace(const nsCString& aName) {
|
|
struct FaceNameComparator {
|
|
FaceNameComparator(FontList* aList, const nsCString& aTarget)
|
|
: mList(aList), mTarget(aTarget) {}
|
|
|
|
int operator()(const LocalFaceRec& aVal) const {
|
|
return Compare(mTarget,
|
|
nsDependentCString(aVal.mKey.BeginReading(mList)));
|
|
}
|
|
|
|
private:
|
|
FontList* mList;
|
|
const nsCString& mTarget;
|
|
};
|
|
|
|
Header& header = GetHeader();
|
|
|
|
LocalFaceRec* faces = LocalFaces();
|
|
size_t match;
|
|
if (faces && BinarySearchIf(faces, 0, header.mLocalFaceCount,
|
|
FaceNameComparator(this, aName), &match)) {
|
|
return &faces[match];
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
void FontList::SearchForLocalFace(const nsACString& aName, Family** aFamily,
|
|
Face** aFace) {
|
|
Header& header = GetHeader();
|
|
MOZ_ASSERT(header.mLocalFaceCount == 0,
|
|
"do not use when local face names are already set up!");
|
|
LOG_FONTLIST(
|
|
("(shared-fontlist) local face search for (%s)", aName.BeginReading()));
|
|
char initial = aName[0];
|
|
Family* families = Families();
|
|
if (!families) {
|
|
return;
|
|
}
|
|
for (uint32_t i = 0; i < header.mFamilyCount; i++) {
|
|
Family* family = &families[i];
|
|
if (family->Key().BeginReading(this)[0] != initial) {
|
|
continue;
|
|
}
|
|
LOG_FONTLIST(("(shared-fontlist) checking family (%s)",
|
|
family->Key().AsString(this).BeginReading()));
|
|
if (!family->IsInitialized()) {
|
|
if (!gfxPlatformFontList::PlatformFontList()->InitializeFamily(family)) {
|
|
continue;
|
|
}
|
|
}
|
|
Pointer* faces = family->Faces(this);
|
|
if (!faces) {
|
|
continue;
|
|
}
|
|
for (uint32_t j = 0; j < family->NumFaces(); j++) {
|
|
auto* face = faces[j].ToPtr<Face>(this);
|
|
if (!face) {
|
|
continue;
|
|
}
|
|
nsAutoCString psname, fullname;
|
|
if (gfxPlatformFontList::PlatformFontList()->ReadFaceNames(
|
|
family, face, psname, fullname)) {
|
|
LOG_FONTLIST(("(shared-fontlist) read psname (%s) fullname (%s)",
|
|
psname.get(), fullname.get()));
|
|
ToLowerCase(psname);
|
|
ToLowerCase(fullname);
|
|
if (aName == psname || aName == fullname) {
|
|
*aFamily = family;
|
|
*aFace = face;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t FontList::SizeOfIncludingThis(
|
|
mozilla::MallocSizeOf aMallocSizeOf) const {
|
|
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
|
|
}
|
|
|
|
size_t FontList::SizeOfExcludingThis(
|
|
mozilla::MallocSizeOf aMallocSizeOf) const {
|
|
size_t result = mBlocks.ShallowSizeOfExcludingThis(aMallocSizeOf);
|
|
for (const auto& b : mBlocks) {
|
|
result += aMallocSizeOf(b.get()) + aMallocSizeOf(b->mShmem.get());
|
|
}
|
|
return result;
|
|
}
|
|
|
|
size_t FontList::AllocatedShmemSize() const {
|
|
size_t result = 0;
|
|
for (const auto& b : mBlocks) {
|
|
result += b->BlockSize();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
} // namespace fontlist
|
|
} // namespace mozilla
|