C++ GlyphPageTreeNode::page方法代码示例

static inline std::pair<GlyphData, GlyphPage*> glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(UChar32 character, NonCJKGlyphOrientation orientation, GlyphData& data, GlyphPage* page, unsigned pageNumber)
{
    if (orientation == NonCJKGlyphOrientationUpright || shouldIgnoreRotation(character)) {
        RefPtr<SimpleFontData> uprightFontData = data.fontData->uprightOrientationFontData();
        GlyphPageTreeNode* uprightNode = GlyphPageTreeNode::getRootChild(uprightFontData.get(), pageNumber);
        GlyphPage* uprightPage = uprightNode->page();
        if (uprightPage) {
            GlyphData uprightData = uprightPage->glyphDataForCharacter(character);
            // If the glyphs are the same, then we know we can just use the horizontal glyph rotated vertically to be upright.
            if (data.glyph == uprightData.glyph)
                return std::make_pair(data, page);
            // 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.fontData)
                return std::make_pair(uprightData, uprightPage);
        }
    } else if (orientation == NonCJKGlyphOrientationVerticalRight) {
        RefPtr<SimpleFontData> verticalRightFontData = data.fontData->verticalRightOrientationFontData();
        GlyphPageTreeNode* verticalRightNode = GlyphPageTreeNode::getRootChild(verticalRightFontData.get(), pageNumber);
        GlyphPage* verticalRightPage = verticalRightNode->page();
        if (verticalRightPage) {
            GlyphData verticalRightData = verticalRightPage->glyphDataForCharacter(character);
            // If the glyphs are distinct, we will make the assumption that the font has a vertical-right glyph baked
            // into it.
            if (data.glyph != verticalRightData.glyph)
                return std::make_pair(data, page);
            // The glyphs are identical, meaning that we should just use the horizontal glyph.
            if (verticalRightData.fontData)
                return std::make_pair(verticalRightData, verticalRightPage);
        }
    }
    return std::make_pair(data, page);
}

bool Font::primaryFontHasGlyphForCharacter(UChar32 character) const
{
    unsigned pageNumber = (character / GlyphPage::size);

    GlyphPageTreeNode* node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber);
    GlyphPage* page = node->page();

    return page && page->fontDataForCharacter(character);
}

std::pair<GlyphData, GlyphPage*> Font::glyphDataAndPageForCharacter(UChar32 c, bool mirror, FontDataVariant variant) const
{
    ASSERT(isMainThread());

    if (variant == AutoVariant) {
        if (m_fontDescription.smallCaps() && !primaryFont()->isSVGFont()) {
            UChar32 upperC = toUpper(c);
            if (upperC != c) {
                c = upperC;
                variant = SmallCapsVariant;
            } else {
                variant = NormalVariant;
            }
        } else {
            variant = NormalVariant;
        }
    }

    if (mirror)
        c = mirroredChar(c);

    unsigned pageNumber = (c / GlyphPage::size);

    GlyphPageTreeNode* node = pageNumber ? m_fontFallbackList->m_pages.get(pageNumber) : m_fontFallbackList->m_pageZero;
    if (!node) {
        node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
        if (pageNumber)
            m_fontFallbackList->m_pages.set(pageNumber, node);
        else
            m_fontFallbackList->m_pageZero = node;
    }

    GlyphPage* page = 0;
    if (variant == NormalVariant) {
        // Fastest loop, for the common case (normal variant).
        while (true) {
            page = node->page();
            if (page) {
                GlyphData data = page->glyphDataForCharacter(c);
                if (data.fontData && (data.fontData->platformData().orientation() == Horizontal || data.fontData->isTextOrientationFallback()))
                    return make_pair(data, page);

                if (data.fontData) {
                    if (Character::isCJKIdeographOrSymbol(c)) {
                        if (!data.fontData->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).
                            variant = BrokenIdeographVariant;
                            break;
                        }
                    } else {
                        return glyphDataAndPageForNonCJKCharacterWithGlyphOrientation(c, m_fontDescription.nonCJKGlyphOrientation(), data, page, pageNumber);
                    }

                    return make_pair(data, page);
                }

                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
            if (pageNumber)
                m_fontFallbackList->m_pages.set(pageNumber, node);
            else
                m_fontFallbackList->m_pageZero = node;
        }
    }
    if (variant != NormalVariant) {
        while (true) {
            page = node->page();
            if (page) {
                GlyphData data = page->glyphDataForCharacter(c);
                if (data.fontData) {
                    // The variantFontData function should not normally return 0.
                    // But if it does, we will just render the capital letter big.
                    RefPtr<SimpleFontData> variantFontData = data.fontData->variantFontData(m_fontDescription, variant);
                    if (!variantFontData)
                        return make_pair(data, page);

                    GlyphPageTreeNode* variantNode = GlyphPageTreeNode::getRootChild(variantFontData.get(), pageNumber);
                    GlyphPage* variantPage = variantNode->page();
                    if (variantPage) {
                        GlyphData data = variantPage->glyphDataForCharacter(c);
                        if (data.fontData)
                            return make_pair(data, variantPage);
                    }

                    // Do not attempt system fallback off the variantFontData. This is the very unlikely case that
                    // a font has the lowercase character but the small caps font does not have its uppercase version.
                    return make_pair(variantFontData->missingGlyphData(), page);
                }

                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
//.........这里部分代码省略.........

const GlyphData& Font::glyphDataForCharacter(UChar32 c, bool mirror, bool forceSmallCaps) const
{
    bool useSmallCapsFont = forceSmallCaps;
    if (m_fontDescription.smallCaps()) {
        UChar32 upperC = Unicode::toUpper(c);
        if (upperC != c) {
            c = upperC;
            useSmallCapsFont = true;
        }
    }

    if (mirror)
        c = mirroredChar(c);

    unsigned pageNumber = (c / GlyphPage::size);

    GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero;
    if (!node) {
        node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
        if (pageNumber)
            m_pages.set(pageNumber, node);
        else
            m_pageZero = node;
    }

    GlyphPage* page;
    if (!useSmallCapsFont) {
        // Fastest loop, for the common case (not small caps).
        while (true) {
            page = node->page();
            if (page) {
                const GlyphData& data = page->glyphDataForCharacter(c);
                if (data.fontData)
                    return data;
                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
            if (pageNumber)
                m_pages.set(pageNumber, node);
            else
                m_pageZero = node;
        }
    } else {
        while (true) {
            page = node->page();
            if (page) {
                const GlyphData& data = page->glyphDataForCharacter(c);
                if (data.fontData) {
                    // The smallCapsFontData function should not normally return 0.
                    // But if it does, we will just render the capital letter big.
                    const SimpleFontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);
                    if (!smallCapsFontData)
                        return data;

                    GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
                    const GlyphPage* smallCapsPage = smallCapsNode->page();
                    if (smallCapsPage) {
                        const GlyphData& data = smallCapsPage->glyphDataForCharacter(c);
                        if (data.fontData)
                            return data;
                    }

                    // Do not attempt system fallback off the smallCapsFontData. This is the very unlikely case that
                    // a font has the lowercase character but the small caps font does not have its uppercase version.
                    return smallCapsFontData->missingGlyphData();
                }

                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
            if (pageNumber)
                m_pages.set(pageNumber, node);
            else
                m_pageZero = node;
        }
    }

    ASSERT(page);
    ASSERT(node->isSystemFallback());

    // System fallback is character-dependent. When we get here, we
    // know that the character in question isn't in the system fallback
    // font's glyph page. Try to lazily create it here.
    UChar codeUnits[2];
    int codeUnitsLength;
    if (c <= 0xFFFF) {
        UChar c16 = c;
        if (Font::treatAsSpace(c16))
            codeUnits[0] = ' ';
        else if (Font::treatAsZeroWidthSpace(c16))
            codeUnits[0] = zeroWidthSpace;
        else
            codeUnits[0] = c16;
        codeUnitsLength = 1;
//.........这里部分代码省略.........

// FIXME: It is unfortunate that this function needs to be passed the original cluster.
// It is only required for the platform's FontCache::getFontDataForCharacters(), and it means
// that this function is not correct if it transforms the character to uppercase and calls
// FontCache::getFontDataForCharacters() afterwards.
const GlyphData& Font::glyphDataForCharacter(UChar32 c, const UChar* cluster, unsigned clusterLength, bool mirror, bool attemptFontSubstitution) const
{
    bool smallCaps = false;

    if (m_fontDescription.smallCaps() && !Unicode::isUpper(c)) {
        // Convert lowercase to upper.
        UChar32 upperC = Unicode::toUpper(c);
        if (upperC != c) {
            c = upperC;
            smallCaps = true;
        }
    }

    if (mirror)
        c = mirroredChar(c);

    unsigned pageNumber = (c / GlyphPage::size);

    GlyphPageTreeNode* node = pageNumber ? m_pages.get(pageNumber) : m_pageZero;
    if (!node) {
        node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber);
        if (pageNumber)
            m_pages.set(pageNumber, node);
        else
            m_pageZero = node;
    }

    if (!attemptFontSubstitution && node->level() != 1)
        node = GlyphPageTreeNode::getRootChild(primaryFont(), pageNumber);

    while (true) {
        GlyphPage* page = node->page();

        if (page) {
            const GlyphData& data = page->glyphDataForCharacter(c);
            if (data.glyph || !attemptFontSubstitution) {
                if (!smallCaps)
                    return data;  // We have a glyph for the character in question in the current page (or we've been told not to fall back).

                const FontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);

                if (!smallCapsFontData)
                    // This should not happen, but if it does, we will return a big cap.
                    return data;

                GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
                GlyphPage* smallCapsPage = smallCapsNode->page();

                if (smallCapsPage) {
                    const GlyphData& data = smallCapsPage->glyphDataForCharacter(c);
                    if (data.glyph || !attemptFontSubstitution)
                        return data;
                }
                // Not attempting system fallback off the smallCapsFontData. This is the very unlikely case that
                // a font has the lowercase character but not its uppercase version.
                return smallCapsFontData->missingGlyphData();
            }
        } else if (!attemptFontSubstitution) {
            if (smallCaps) {
                if (const FontData* smallCapsFontData = primaryFont()->smallCapsFontData(m_fontDescription))
                    return smallCapsFontData->missingGlyphData();
            }
            return primaryFont()->missingGlyphData();
        }

        if (node->isSystemFallback()) {
            // System fallback is character-dependent. When we get here, we
            // know that the character in question isn't in the system fallback
            // font's glyph page. Try to lazily create it here.

            // Convert characters that shouldn't render to zero width spaces when asking what font is
            // appropriate.
            const FontData* characterFontData;
            if (clusterLength == 1 && Font::treatAsZeroWidthSpace(cluster[0]))
#ifdef __OWB__
                characterFontData = FontCache::getFontDataForCharacters(*this, &WebCore::zeroWidthSpace, 1);
#else
                characterFontData = FontCache::getFontDataForCharacters(*this, &zeroWidthSpace, 1);
#endif //__OWB__
            else
                characterFontData = FontCache::getFontDataForCharacters(*this, cluster, clusterLength);
            if (smallCaps)
                characterFontData = characterFontData->smallCapsFontData(m_fontDescription);
            if (characterFontData) {
                // Got the fallback font, return the glyph page associated with
                // it. We also store the FontData for the glyph in the fallback
                // page for future use (it's lazily populated by us).
                GlyphPage* fallbackPage = GlyphPageTreeNode::getRootChild(characterFontData, pageNumber)->page();
                const GlyphData& data = fallbackPage ? fallbackPage->glyphDataForCharacter(c) : characterFontData->missingGlyphData();
                if (!smallCaps)
                    page->setGlyphDataForCharacter(c, data.glyph, characterFontData);
                return data;
            }
            // Even system fallback can fail.
            // FIXME: Should the last resort font be used?
            const GlyphData& data = primaryFont()->missingGlyphData();
//.........这里部分代码省略.........

GlyphData Font::glyphDataForCharacter(UChar32 c, bool mirror, bool forceSmallCaps) const
{
    ASSERT(isMainThread());

    bool useSmallCapsFont = forceSmallCaps;
    if (m_fontDescription.smallCaps()) {
        UChar32 upperC = toUpper(c);
        if (upperC != c) {
            c = upperC;
            useSmallCapsFont = true;
        }
    }

    if (mirror)
        c = mirroredChar(c);

    unsigned pageNumber = (c / GlyphPage::size);

    GlyphPageTreeNode* node = pageNumber ? m_fontList->m_pages.get(pageNumber) : m_fontList->m_pageZero;
    if (!node) {
        node = GlyphPageTreeNode::getRootChild(fontDataAt(0), pageNumber);
        if (pageNumber)
            m_fontList->m_pages.set(pageNumber, node);
        else
            m_fontList->m_pageZero = node;
    }

    GlyphPage* page;
    if (!useSmallCapsFont) {
        // Fastest loop, for the common case (not small caps).
        while (true) {
            page = node->page();
            if (page) {
                GlyphData data = page->glyphDataForCharacter(c);
                if (data.fontData)
                    return data;
                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
            if (pageNumber)
                m_fontList->m_pages.set(pageNumber, node);
            else
                m_fontList->m_pageZero = node;
        }
    } else {
        while (true) {
            page = node->page();
            if (page) {
                GlyphData data = page->glyphDataForCharacter(c);
                if (data.fontData) {
                    // The smallCapsFontData function should not normally return 0.
                    // But if it does, we will just render the capital letter big.
                    const SimpleFontData* smallCapsFontData = data.fontData->smallCapsFontData(m_fontDescription);
                    if (!smallCapsFontData)
                        return data;

                    GlyphPageTreeNode* smallCapsNode = GlyphPageTreeNode::getRootChild(smallCapsFontData, pageNumber);
                    const GlyphPage* smallCapsPage = smallCapsNode->page();
                    if (smallCapsPage) {
                        GlyphData data = smallCapsPage->glyphDataForCharacter(c);
                        if (data.fontData)
                            return data;
                    }

                    // Do not attempt system fallback off the smallCapsFontData. This is the very unlikely case that
                    // a font has the lowercase character but the small caps font does not have its uppercase version.
                    return smallCapsFontData->missingGlyphData();
                }

                if (node->isSystemFallback())
                    break;
            }

            // Proceed with the fallback list.
            node = node->getChild(fontDataAt(node->level()), pageNumber);
            if (pageNumber)
                m_fontList->m_pages.set(pageNumber, node);
            else
                m_fontList->m_pageZero = node;
        }
    }

    ASSERT(page);
    ASSERT(node->isSystemFallback());

    // System fallback is character-dependent. When we get here, we
    // know that the character in question isn't in the system fallback
    // font's glyph page. Try to lazily create it here.
    UChar codeUnits[2];
    int codeUnitsLength;
    if (c <= 0xFFFF) {
        codeUnits[0] = Font::normalizeSpaces(c);
        codeUnitsLength = 1;
    } else {
        codeUnits[0] = U16_LEAD(c);
        codeUnits[1] = U16_TRAIL(c);
        codeUnitsLength = 2;
//.........这里部分代码省略.........