| /* |
| * Copyright (C) 2006, 2013-2015 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "FontCascadeFonts.h" |
| |
| #include "FontCache.h" |
| #include "FontCascade.h" |
| #include "GlyphPage.h" |
| |
| namespace WebCore { |
| |
| class MixedFontGlyphPage { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| MixedFontGlyphPage(const GlyphPage* initialPage) |
| { |
| if (initialPage) { |
| for (unsigned i = 0; i < GlyphPage::size; ++i) |
| setGlyphDataForIndex(i, initialPage->glyphDataForIndex(i)); |
| } |
| } |
| |
| GlyphData glyphDataForCharacter(UChar32 c) const |
| { |
| unsigned index = GlyphPage::indexForCodePoint(c); |
| ASSERT_WITH_SECURITY_IMPLICATION(index < GlyphPage::size); |
| return { m_glyphs[index], m_fonts[index] }; |
| } |
| |
| void setGlyphDataForCharacter(UChar32 c, GlyphData glyphData) |
| { |
| setGlyphDataForIndex(GlyphPage::indexForCodePoint(c), glyphData); |
| } |
| |
| private: |
| void setGlyphDataForIndex(unsigned index, const GlyphData& glyphData) |
| { |
| ASSERT_WITH_SECURITY_IMPLICATION(index < GlyphPage::size); |
| m_glyphs[index] = glyphData.glyph; |
| m_fonts[index] = glyphData.font; |
| } |
| |
| Glyph m_glyphs[GlyphPage::size] { }; |
| const Font* m_fonts[GlyphPage::size] { }; |
| }; |
| |
| GlyphData FontCascadeFonts::GlyphPageCacheEntry::glyphDataForCharacter(UChar32 character) |
| { |
| ASSERT(!(m_singleFont && m_mixedFont)); |
| if (m_singleFont) |
| return m_singleFont->glyphDataForCharacter(character); |
| if (m_mixedFont) |
| return m_mixedFont->glyphDataForCharacter(character); |
| return 0; |
| } |
| |
| void FontCascadeFonts::GlyphPageCacheEntry::setGlyphDataForCharacter(UChar32 character, GlyphData glyphData) |
| { |
| ASSERT(!glyphDataForCharacter(character).glyph); |
| if (!m_mixedFont) { |
| m_mixedFont = makeUnique<MixedFontGlyphPage>(m_singleFont.get()); |
| m_singleFont = nullptr; |
| } |
| m_mixedFont->setGlyphDataForCharacter(character, glyphData); |
| } |
| |
| void FontCascadeFonts::GlyphPageCacheEntry::setSingleFontPage(RefPtr<GlyphPage>&& page) |
| { |
| ASSERT(isNull()); |
| m_singleFont = page; |
| } |
| |
| FontCascadeFonts::FontCascadeFonts(RefPtr<FontSelector>&& fontSelector) |
| : m_cachedPrimaryFont(nullptr) |
| , m_fontSelector(fontSelector) |
| , m_fontSelectorVersion(m_fontSelector ? m_fontSelector->version() : 0) |
| , m_generation(FontCache::singleton().generation()) |
| { |
| } |
| |
| FontCascadeFonts::FontCascadeFonts(const FontPlatformData& platformData) |
| : m_cachedPrimaryFont(nullptr) |
| , m_fontSelectorVersion(0) |
| , m_generation(FontCache::singleton().generation()) |
| , m_isForPlatformFont(true) |
| { |
| m_realizedFallbackRanges.append(FontRanges(FontCache::singleton().fontForPlatformData(platformData))); |
| } |
| |
| FontCascadeFonts::~FontCascadeFonts() = default; |
| |
| void FontCascadeFonts::determinePitch(const FontCascadeDescription& description) |
| { |
| auto& primaryRanges = realizeFallbackRangesAt(description, 0); |
| unsigned numRanges = primaryRanges.size(); |
| if (numRanges == 1) |
| m_pitch = primaryRanges.fontForFirstRange().pitch(); |
| else |
| m_pitch = VariablePitch; |
| } |
| |
| bool FontCascadeFonts::isLoadingCustomFonts() const |
| { |
| for (auto& fontRanges : m_realizedFallbackRanges) { |
| if (fontRanges.isLoading()) |
| return true; |
| } |
| return false; |
| } |
| |
| static FontRanges realizeNextFallback(const FontCascadeDescription& description, unsigned& index, FontSelector* fontSelector) |
| { |
| ASSERT(index < description.effectiveFamilyCount()); |
| |
| auto& fontCache = FontCache::singleton(); |
| while (index < description.effectiveFamilyCount()) { |
| auto visitor = WTF::makeVisitor([&](const AtomString& family) -> FontRanges { |
| if (family.isEmpty()) |
| return FontRanges(); |
| if (fontSelector) { |
| auto ranges = fontSelector->fontRangesForFamily(description, family); |
| if (!ranges.isNull()) |
| return ranges; |
| } |
| if (auto font = fontCache.fontForFamily(description, family)) |
| return FontRanges(WTFMove(font)); |
| return FontRanges(); |
| }, [&](const FontFamilyPlatformSpecification& fontFamilySpecification) -> FontRanges { |
| return fontFamilySpecification.fontRanges(description); |
| }); |
| const auto& currentFamily = description.effectiveFamilyAt(index++); |
| auto ranges = WTF::visit(visitor, currentFamily); |
| if (!ranges.isNull()) |
| return ranges; |
| } |
| // We didn't find a font. Try to find a similar font using our own specific knowledge about our platform. |
| // For example on OS X, we know to map any families containing the words Arabic, Pashto, or Urdu to the |
| // Geeza Pro font. |
| for (auto& family : description.families()) { |
| if (auto font = fontCache.similarFont(description, family)) |
| return FontRanges(WTFMove(font)); |
| } |
| return { }; |
| } |
| |
| const FontRanges& FontCascadeFonts::realizeFallbackRangesAt(const FontCascadeDescription& description, unsigned index) |
| { |
| if (index < m_realizedFallbackRanges.size()) |
| return m_realizedFallbackRanges[index]; |
| |
| ASSERT(index == m_realizedFallbackRanges.size()); |
| ASSERT(FontCache::singleton().generation() == m_generation); |
| |
| m_realizedFallbackRanges.append(FontRanges()); |
| auto& fontRanges = m_realizedFallbackRanges.last(); |
| |
| if (!index) { |
| fontRanges = realizeNextFallback(description, m_lastRealizedFallbackIndex, m_fontSelector.get()); |
| if (fontRanges.isNull() && m_fontSelector) |
| fontRanges = m_fontSelector->fontRangesForFamily(description, standardFamily); |
| if (fontRanges.isNull()) |
| fontRanges = FontRanges(FontCache::singleton().lastResortFallbackFont(description)); |
| return fontRanges; |
| } |
| |
| if (m_lastRealizedFallbackIndex < description.effectiveFamilyCount()) |
| fontRanges = realizeNextFallback(description, m_lastRealizedFallbackIndex, m_fontSelector.get()); |
| |
| if (fontRanges.isNull() && m_fontSelector) { |
| ASSERT(m_lastRealizedFallbackIndex >= description.effectiveFamilyCount()); |
| |
| unsigned fontSelectorFallbackIndex = m_lastRealizedFallbackIndex - description.effectiveFamilyCount(); |
| if (fontSelectorFallbackIndex == m_fontSelector->fallbackFontCount()) |
| return fontRanges; |
| ++m_lastRealizedFallbackIndex; |
| fontRanges = FontRanges(m_fontSelector->fallbackFontAt(description, fontSelectorFallbackIndex)); |
| } |
| |
| return fontRanges; |
| } |
| |
| static inline bool isInRange(UChar32 character, UChar32 lowerBound, UChar32 upperBound) |
| { |
| return character >= lowerBound && character <= upperBound; |
| } |
| |
| static bool shouldIgnoreRotation(UChar32 character) |
| { |
| if (character == 0x000A7 || character == 0x000A9 || character == 0x000AE) |
| return true; |
| |
| if (character == 0x000B6 || character == 0x000BC || character == 0x000BD || character == 0x000BE) |
| return true; |
| |
| if (isInRange(character, 0x002E5, 0x002EB)) |
| return true; |
| |
| if (isInRange(character, 0x01100, 0x011FF) || isInRange(character, 0x01401, 0x0167F) || isInRange(character, 0x01800, 0x018FF)) |
| return true; |
| |
| if (character == 0x02016 || character == 0x02020 || character == 0x02021 || character == 0x2030 || character == 0x02031) |
| return true; |
| |
| if (isInRange(character, 0x0203B, 0x0203D) || character == 0x02042 || character == 0x02044 || character == 0x02047 |
| || character == 0x02048 || character == 0x02049 || character == 0x2051) |
| return true; |
| |
| if (isInRange(character, 0x02065, 0x02069) || isInRange(character, 0x020DD, 0x020E0) |
| || isInRange(character, 0x020E2, 0x020E4) || isInRange(character, 0x02100, 0x02117) |
| || isInRange(character, 0x02119, 0x02131) || isInRange(character, 0x02133, 0x0213F)) |
| return true; |
| |
| if (isInRange(character, 0x02145, 0x0214A) || character == 0x0214C || character == 0x0214D |
| || isInRange(character, 0x0214F, 0x0218F)) |
| return true; |
| |
| if (isInRange(character, 0x02300, 0x02307) || isInRange(character, 0x0230C, 0x0231F) |
| || isInRange(character, 0x02322, 0x0232B) || isInRange(character, 0x0237D, 0x0239A) |
| || isInRange(character, 0x023B4, 0x023B6) || isInRange(character, 0x023BA, 0x023CF) |
| || isInRange(character, 0x023D1, 0x023DB) || isInRange(character, 0x023E2, 0x024FF)) |
| return true; |
| |
| if (isInRange(character, 0x025A0, 0x02619) || isInRange(character, 0x02620, 0x02767) |
| || isInRange(character, 0x02776, 0x02793) || isInRange(character, 0x02B12, 0x02B2F) |
| || isInRange(character, 0x02B4D, 0x02BFF) || isInRange(character, 0x02E80, 0x03007)) |
| return true; |
| |
| if (character == 0x03012 || character == 0x03013 || isInRange(character, 0x03020, 0x0302F) |
| || isInRange(character, 0x03031, 0x0309F) || isInRange(character, 0x030A1, 0x030FB) |
| || isInRange(character, 0x030FD, 0x0A4CF)) |
| return true; |
| |
| if (isInRange(character, 0x0A840, 0x0A87F) || isInRange(character, 0x0A960, 0x0A97F) |
| || isInRange(character, 0x0AC00, 0x0D7FF) || isInRange(character, 0x0E000, 0x0FAFF)) |
| return true; |
| |
| if (isInRange(character, 0x0FE10, 0x0FE1F) || isInRange(character, 0x0FE30, 0x0FE48) |
| || isInRange(character, 0x0FE50, 0x0FE57) || isInRange(character, 0x0FE5F, 0x0FE62) |
| || isInRange(character, 0x0FE67, 0x0FE6F)) |
| return true; |
| |
| if (isInRange(character, 0x0FF01, 0x0FF07) || isInRange(character, 0x0FF0A, 0x0FF0C) |
| || isInRange(character, 0x0FF0E, 0x0FF19) || character == 0x0FF1B || isInRange(character, 0x0FF1F, 0x0FF3A)) |
| return true; |
| |
| if (character == 0x0FF3C || character == 0x0FF3E) |
| return true; |
| |
| if (isInRange(character, 0x0FF40, 0x0FF5A) || isInRange(character, 0x0FFE0, 0x0FFE2) |
| || isInRange(character, 0x0FFE4, 0x0FFE7) || isInRange(character, 0x0FFF0, 0x0FFF8) |
| || character == 0x0FFFD) |
| return true; |
| |
| if (isInRange(character, 0x13000, 0x1342F) || isInRange(character, 0x1B000, 0x1B0FF) |
| || isInRange(character, 0x1D000, 0x1D1FF) || isInRange(character, 0x1D300, 0x1D37F) |
| || isInRange(character, 0x1F000, 0x1F64F) || isInRange(character, 0x1F680, 0x1F77F)) |
| return true; |
| |
| if (isInRange(character, 0x20000, 0x2FFFD) || isInRange(character, 0x30000, 0x3FFFD)) |
| return true; |
| |
| return false; |
| } |
| |
| static GlyphData glyphDataForNonCJKCharacterWithGlyphOrientation(UChar32 character, NonCJKGlyphOrientation orientation, const GlyphData& data) |
| { |
| bool syntheticOblique = data.font->platformData().syntheticOblique(); |
| if (orientation == NonCJKGlyphOrientation::Upright || shouldIgnoreRotation(character)) { |
| GlyphData uprightData = data.font->uprightOrientationFont().glyphDataForCharacter(character); |
| // If the glyphs are the same, then we know we can just use the horizontal glyph rotated vertically |
| // to be upright. For synthetic oblique, however, we will always return the uprightData to ensure |
| // that non-CJK and CJK runs are broken up. This guarantees that vertical |
| // fonts without isTextOrientationFallback() set contain CJK characters only and thus we can get |
| // the oblique slant correct. |
| if (data.glyph == uprightData.glyph && !syntheticOblique) |
| return data; |
| // The glyphs are distinct, meaning that the font has a vertical-right glyph baked into it. We can't use that |
| // glyph, so we fall back to the upright data and use the horizontal glyph. |
| if (uprightData.font) |
| return uprightData; |
| } else if (orientation == NonCJKGlyphOrientation::Mixed) { |
| GlyphData verticalRightData = data.font->verticalRightOrientationFont().glyphDataForCharacter(character); |
| |
| // If there is a baked-in rotated glyph, we will use it unless syntheticOblique is set. If |
| // synthetic oblique is set, we fall back to the horizontal glyph. This guarantees that vertical |
| // fonts without isTextOrientationFallback() set contain CJK characters only and thus we can get |
| // the oblique slant correct. |
| if (data.glyph != verticalRightData.glyph && !syntheticOblique) |
| return data; |
| |
| // The glyphs are identical, meaning that we should just use the horizontal glyph. |
| if (verticalRightData.font) |
| return verticalRightData; |
| } |
| return data; |
| } |
| |
| static const Font* findBestFallbackFont(FontCascadeFonts& fontCascadeFonts, const FontCascadeDescription& description, UChar32 character) |
| { |
| for (unsigned fallbackIndex = 0; ; ++fallbackIndex) { |
| auto& fontRanges = fontCascadeFonts.realizeFallbackRangesAt(description, fallbackIndex); |
| if (fontRanges.isNull()) |
| break; |
| auto* currentFont = fontRanges.glyphDataForCharacter(character, ExternalResourceDownloadPolicy::Forbid).font; |
| if (!currentFont) |
| currentFont = &fontRanges.fontForFirstRange(); |
| |
| if (!currentFont->isInterstitial()) |
| return currentFont; |
| } |
| |
| return nullptr; |
| } |
| |
| GlyphData FontCascadeFonts::glyphDataForSystemFallback(UChar32 character, const FontCascadeDescription& description, FontVariant variant, bool systemFallbackShouldBeInvisible) |
| { |
| const Font* font = findBestFallbackFont(*this, description, character); |
| |
| if (!font) |
| font = &realizeFallbackRangesAt(description, 0).fontForFirstRange(); |
| |
| auto systemFallbackFont = font->systemFallbackFontForCharacter(character, description, m_isForPlatformFont ? IsForPlatformFont::Yes : IsForPlatformFont::No); |
| if (!systemFallbackFont) |
| return GlyphData(); |
| |
| #if HAVE(DISALLOWABLE_USER_INSTALLED_FONTS) |
| ASSERT(!systemFallbackFont->isUserInstalledFont() || description.shouldAllowUserInstalledFonts() == AllowUserInstalledFonts::Yes); |
| #endif |
| |
| if (systemFallbackShouldBeInvisible) |
| systemFallbackFont = const_cast<Font*>(&systemFallbackFont->invisibleFont()); |
| |
| if (systemFallbackFont->platformData().orientation() == FontOrientation::Vertical && !systemFallbackFont->hasVerticalGlyphs() && FontCascade::isCJKIdeographOrSymbol(character)) |
| variant = BrokenIdeographVariant; |
| |
| GlyphData fallbackGlyphData; |
| if (variant == NormalVariant) |
| fallbackGlyphData = systemFallbackFont->glyphDataForCharacter(character); |
| else |
| fallbackGlyphData = systemFallbackFont->variantFont(description, variant)->glyphDataForCharacter(character); |
| |
| if (fallbackGlyphData.font && fallbackGlyphData.font->platformData().orientation() == FontOrientation::Vertical && !fallbackGlyphData.font->isTextOrientationFallback()) { |
| if (variant == NormalVariant && !FontCascade::isCJKIdeographOrSymbol(character)) |
| fallbackGlyphData = glyphDataForNonCJKCharacterWithGlyphOrientation(character, description.nonCJKGlyphOrientation(), fallbackGlyphData); |
| } |
| |
| // Keep the system fallback fonts we use alive. |
| if (fallbackGlyphData.glyph) |
| m_systemFallbackFontSet.add(WTFMove(systemFallbackFont)); |
| |
| return fallbackGlyphData; |
| } |
| |
| enum class FallbackVisibility { |
| Immaterial, |
| Visible, |
| Invisible |
| }; |
| |
| static void opportunisticallyStartFontDataURLLoading(const FontCascadeDescription& description, FontSelector* fontSelector) |
| { |
| // It is a somewhat common practice for a font foundry to break up a single font into two fonts, each having a random half of |
| // the alphabet, and then encoding the two fonts as data: urls (with different font-family names). |
| // Therefore, if these two fonts don't get loaded at (nearly) the same time, there will be a flash of unintelligible text where |
| // only a random half of the letters are visible. |
| // This code attempts to pre-warm these data urls to make them load at closer to the same time. However, font loading is |
| // asynchronous, and this code doesn't actually fix the race - it just makes it more likely for the two fonts to tie in the race. |
| if (!fontSelector) |
| return; |
| for (unsigned i = 0; i < description.familyCount(); ++i) |
| fontSelector->opportunisticallyStartFontDataURLLoading(description, description.familyAt(i)); |
| } |
| |
| GlyphData FontCascadeFonts::glyphDataForVariant(UChar32 character, const FontCascadeDescription& description, FontVariant variant, unsigned fallbackIndex) |
| { |
| FallbackVisibility fallbackVisibility = FallbackVisibility::Immaterial; |
| ExternalResourceDownloadPolicy policy = ExternalResourceDownloadPolicy::Allow; |
| GlyphData loadingResult; |
| opportunisticallyStartFontDataURLLoading(description, m_fontSelector.get()); |
| for (; ; ++fallbackIndex) { |
| auto& fontRanges = realizeFallbackRangesAt(description, fallbackIndex); |
| if (fontRanges.isNull()) |
| break; |
| |
| GlyphData data = fontRanges.glyphDataForCharacter(character, policy); |
| if (!data.font) |
| continue; |
| |
| if (data.font->isInterstitial()) { |
| policy = ExternalResourceDownloadPolicy::Forbid; |
| if (fallbackVisibility == FallbackVisibility::Immaterial) |
| fallbackVisibility = data.font->visibility() == Font::Visibility::Visible ? FallbackVisibility::Visible : FallbackVisibility::Invisible; |
| if (!loadingResult.font && data.glyph) |
| loadingResult = data; |
| continue; |
| } |
| |
| if (fallbackVisibility == FallbackVisibility::Invisible && data.font->visibility() == Font::Visibility::Visible) |
| data.font = &data.font->invisibleFont(); |
| |
| if (variant == NormalVariant) { |
| if (data.font->platformData().orientation() == FontOrientation::Vertical && !data.font->isTextOrientationFallback()) { |
| if (!FontCascade::isCJKIdeographOrSymbol(character)) |
| return glyphDataForNonCJKCharacterWithGlyphOrientation(character, description.nonCJKGlyphOrientation(), data); |
| |
| if (!data.font->hasVerticalGlyphs()) { |
| // Use the broken ideograph font data. The broken ideograph font will use the horizontal width of glyphs |
| // to make sure you get a square (even for broken glyphs like symbols used for punctuation). |
| return glyphDataForVariant(character, description, BrokenIdeographVariant, fallbackIndex); |
| } |
| } |
| } else { |
| // The variantFont function should not normally return 0. |
| // But if it does, we will just render the capital letter big. |
| if (const Font* variantFont = data.font->variantFont(description, variant)) |
| return variantFont->glyphDataForCharacter(character); |
| } |
| |
| return data; |
| } |
| |
| if (loadingResult.font) |
| return loadingResult; |
| return glyphDataForSystemFallback(character, description, variant, fallbackVisibility == FallbackVisibility::Invisible); |
| } |
| |
| static RefPtr<GlyphPage> glyphPageFromFontRanges(unsigned pageNumber, const FontRanges& fontRanges) |
| { |
| const Font* font = nullptr; |
| UChar32 pageRangeFrom = pageNumber * GlyphPage::size; |
| UChar32 pageRangeTo = pageRangeFrom + GlyphPage::size - 1; |
| auto policy = ExternalResourceDownloadPolicy::Allow; |
| FallbackVisibility desiredVisibility = FallbackVisibility::Immaterial; |
| for (unsigned i = 0; i < fontRanges.size(); ++i) { |
| auto& range = fontRanges.rangeAt(i); |
| if (range.from() <= pageRangeFrom && pageRangeTo <= range.to()) { |
| font = range.font(policy); |
| if (!font) |
| continue; |
| if (font->isInterstitial()) { |
| if (desiredVisibility == FallbackVisibility::Immaterial) { |
| auto fontVisibility = font->visibility(); |
| if (fontVisibility == Font::Visibility::Visible) |
| desiredVisibility = FallbackVisibility::Visible; |
| else { |
| ASSERT(fontVisibility == Font::Visibility::Invisible); |
| desiredVisibility = FallbackVisibility::Invisible; |
| } |
| } |
| font = nullptr; |
| policy = ExternalResourceDownloadPolicy::Forbid; |
| continue; |
| } |
| } |
| break; |
| } |
| if (!font || font->platformData().orientation() == FontOrientation::Vertical) |
| return nullptr; |
| |
| if (desiredVisibility == FallbackVisibility::Invisible && font->visibility() == Font::Visibility::Visible) |
| return const_cast<GlyphPage*>(font->invisibleFont().glyphPage(pageNumber)); |
| return const_cast<GlyphPage*>(font->glyphPage(pageNumber)); |
| } |
| |
| GlyphData FontCascadeFonts::glyphDataForCharacter(UChar32 c, const FontCascadeDescription& description, FontVariant variant) |
| { |
| ASSERT(isMainThread()); |
| ASSERT(variant != AutoVariant); |
| |
| if (variant != NormalVariant) |
| return glyphDataForVariant(c, description, variant); |
| |
| const unsigned pageNumber = GlyphPage::pageNumberForCodePoint(c); |
| |
| auto& cacheEntry = pageNumber ? m_cachedPages.add(pageNumber, GlyphPageCacheEntry()).iterator->value : m_cachedPageZero; |
| |
| // Initialize cache with a full page of glyph mappings from a single font. |
| if (cacheEntry.isNull()) |
| cacheEntry.setSingleFontPage(glyphPageFromFontRanges(pageNumber, realizeFallbackRangesAt(description, 0))); |
| |
| GlyphData glyphData = cacheEntry.glyphDataForCharacter(c); |
| if (!glyphData.glyph) { |
| // No glyph, resolve per-character. |
| ASSERT(variant == NormalVariant); |
| glyphData = glyphDataForVariant(c, description, variant); |
| // Cache the results. |
| cacheEntry.setGlyphDataForCharacter(c, glyphData); |
| } |
| |
| return glyphData; |
| } |
| |
| void FontCascadeFonts::pruneSystemFallbacks() |
| { |
| if (m_systemFallbackFontSet.isEmpty()) |
| return; |
| // Mutable glyph pages may reference fallback fonts. |
| if (m_cachedPageZero.isMixedFont()) |
| m_cachedPageZero = { }; |
| m_cachedPages.removeIf([](auto& keyAndValue) { |
| return keyAndValue.value.isMixedFont(); |
| }); |
| m_systemFallbackFontSet.clear(); |
| } |
| |
| } |
