C++ GlyphBuffer::size方法代码示例

// Tests that filling a glyph buffer for a specific range returns the same
// results when shaping word by word as when shaping the full run in one go.
TEST_F(CachingWordShaperTest, CommonAccentRightToLeftFillGlyphBuffer)
{
    // "[] []" with an accent mark over the last square bracket.
    const UChar str[] = { 0x5B, 0x5D, 0x20, 0x5B, 0x301, 0x5D, 0x0 };
    TextRun textRun(str, 6);
    textRun.setDirection(RTL);

    CachingWordShaper shaper(cache.get());
    GlyphBuffer glyphBuffer;
    shaper.fillGlyphBuffer(&font, textRun, fallbackFonts, &glyphBuffer, 1, 6);

    OwnPtr<ShapeCache> referenceCache = adoptPtr(new ShapeCache());
    CachingWordShaper referenceShaper(referenceCache.get());
    GlyphBuffer referenceGlyphBuffer;
    font.setCanShapeWordByWordForTesting(false);
    referenceShaper.fillGlyphBuffer(&font, textRun, fallbackFonts,
        &referenceGlyphBuffer, 1, 6);

    ASSERT_EQ(5u, referenceGlyphBuffer.size());
    ASSERT_EQ(referenceGlyphBuffer.size(), glyphBuffer.size());

    ASSERT_EQ(referenceGlyphBuffer.glyphAt(0), glyphBuffer.glyphAt(0));
    ASSERT_EQ(referenceGlyphBuffer.glyphAt(1), glyphBuffer.glyphAt(1));
    ASSERT_EQ(referenceGlyphBuffer.glyphAt(2), glyphBuffer.glyphAt(2));
    ASSERT_EQ(referenceGlyphBuffer.glyphAt(3), glyphBuffer.glyphAt(3));
    ASSERT_EQ(referenceGlyphBuffer.glyphAt(4), glyphBuffer.glyphAt(4));
}

void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point,
                           int from, int to) const
{
    // This glyph buffer holds our glyphs + advances + font data for each glyph.
    GlyphBuffer glyphBuffer;

    float startX = point.x();
    CoreTextController controller(this, run);
    controller.advance(from);
    float beforeWidth = controller.runWidthSoFar();
    controller.advance(to, &glyphBuffer);
    
    // We couldn't generate any glyphs for the run.  Give up.
    if (glyphBuffer.isEmpty())
        return;
    
    float afterWidth = controller.runWidthSoFar();

    if (run.rtl()) {
        startX += controller.totalWidth() + controller.finalRoundingWidth() - afterWidth;
        for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end)
            glyphBuffer.swap(i, end);
    } else
        startX += beforeWidth;

    // Draw the glyph buffer now at the starting point returned in startX.
    FloatPoint startPoint(startX, point.y());
    drawGlyphBuffer(context, glyphBuffer, run, startPoint);
}

TEST(GlyphBufferTest, ReverseForSimpleRTL) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  glyphBuffer.add(42, font1.get(), 10);
  glyphBuffer.add(43, font1.get(), 15);
  glyphBuffer.add(44, font2.get(), 25);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_EQ(3u, glyphBuffer.size());

  glyphBuffer.reverseForSimpleRTL(30, 100);

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_EQ(3u, glyphBuffer.size());
  EXPECT_EQ(44, glyphBuffer.glyphAt(0));
  EXPECT_EQ(43, glyphBuffer.glyphAt(1));
  EXPECT_EQ(42, glyphBuffer.glyphAt(2));
  EXPECT_EQ(font2.get(), glyphBuffer.fontDataAt(0));
  EXPECT_EQ(font1.get(), glyphBuffer.fontDataAt(1));
  EXPECT_EQ(font1.get(), glyphBuffer.fontDataAt(2));
  EXPECT_EQ(70, glyphBuffer.xOffsetAt(0));
  EXPECT_EQ(75, glyphBuffer.xOffsetAt(1));
  EXPECT_EQ(85, glyphBuffer.xOffsetAt(2));
}

float Font::getGlyphsAndAdvancesForSimpleText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
    WidthIterator it(this, run, 0, false, forTextEmphasis);
    GlyphBuffer localGlyphBuffer;
    it.advance(run.length(), &localGlyphBuffer);

    if (localGlyphBuffer.isEmpty())
        return 0;

    float totalWidth = it.m_runWidthSoFar;
    float beforeWidth = 0;
    int glyphPos = 0;
    for (; glyphPos < localGlyphBuffer.size() && it.m_characterIndexOfGlyph[glyphPos] < from; ++glyphPos)
        beforeWidth += localGlyphBuffer.advanceAt(glyphPos).width();
    int glyphFrom = glyphPos;

    float afterWidth = totalWidth;
    glyphPos = localGlyphBuffer.size() - 1;
    for (; glyphPos >= glyphFrom && it.m_characterIndexOfGlyph[glyphPos] >= to; --glyphPos)
        afterWidth -= localGlyphBuffer.advanceAt(glyphPos).width();
    int glyphTo = glyphPos + 1;

    glyphBuffer.add(&localGlyphBuffer, glyphFrom, glyphTo - glyphFrom);

    if (run.rtl()) {
        glyphBuffer.reverse(0, glyphBuffer.size());
        return totalWidth - afterWidth;
    }

    return beforeWidth;
}

FloatRect Font::selectionRectForSimpleText(const TextRun& run, const FloatPoint& point, int h, int from, int to) const
{
    GlyphBuffer glyphBuffer;
    WidthIterator it(this, run);
    it.advance(run.length(), &glyphBuffer);

    float totalWidth = it.m_runWidthSoFar;
    float beforeWidth = 0;
    int glyphPos = 0;
    for (; glyphPos < glyphBuffer.size() && it.m_characterIndexOfGlyph[glyphPos] < from; ++glyphPos)
        beforeWidth += glyphBuffer.advanceAt(glyphPos).width();
    int glyphFrom = glyphPos;

    float afterWidth = totalWidth;
    glyphPos = glyphBuffer.size() - 1;
    for (; glyphPos >= glyphFrom && it.m_characterIndexOfGlyph[glyphPos] >= to; --glyphPos)
        afterWidth -= glyphBuffer.advanceAt(glyphPos).width();

    // Using roundf() rather than ceilf() for the right edge as a compromise to ensure correct caret positioning.
    if (run.rtl()) {
        return FloatRect(floorf(point.x() + totalWidth - afterWidth), point.y(), roundf(point.x() + totalWidth - beforeWidth) - floorf(point.x() + totalWidth - afterWidth), h);
    }

    return FloatRect(floorf(point.x() + beforeWidth), point.y(), roundf(point.x() + afterWidth) - floorf(point.x() + beforeWidth), h);
}

void Font::drawEmphasisMarks(GraphicsContext* context, const TextRun& run, const GlyphBuffer& glyphBuffer, const AtomicString& mark, const FloatPoint& point) const
{
    FontCachePurgePreventer purgePreventer;
    
    GlyphData markGlyphData;
    if (!getEmphasisMarkGlyphData(mark, markGlyphData))
        return;

    const SimpleFontData* markFontData = markGlyphData.fontData;
    ASSERT(markFontData);
    if (!markFontData)
        return;

    Glyph markGlyph = markGlyphData.glyph;
    Glyph spaceGlyph = markFontData->spaceGlyph();

    float middleOfLastGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, 0);
    FloatPoint startPoint(point.x() + middleOfLastGlyph - offsetToMiddleOfGlyph(markFontData, markGlyph), point.y());

    GlyphBuffer markBuffer;
    for (int i = 0; i + 1 < glyphBuffer.size(); ++i) {
        float middleOfNextGlyph = offsetToMiddleOfGlyphAtIndex(glyphBuffer, i + 1);
        float advance = glyphBuffer.advanceAt(i).width() - middleOfLastGlyph + middleOfNextGlyph;
        markBuffer.add(glyphBuffer.glyphAt(i) ? markGlyph : spaceGlyph, markFontData, advance);
        middleOfLastGlyph = middleOfNextGlyph;
    }
    markBuffer.add(glyphBuffer.glyphAt(glyphBuffer.size() - 1) ? markGlyph : spaceGlyph, markFontData, 0);

    drawGlyphBuffer(context, run, markBuffer, startPoint);
}

void Font::drawSimpleText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
    // This glyph buffer holds our glyphs+advances+font data for each glyph.
    GlyphBuffer glyphBuffer;

    float startX = point.x();
    WidthIterator it(this, run);
    it.advance(from);
    float beforeWidth = it.m_runWidthSoFar;
    it.advance(to, &glyphBuffer);
    
    // We couldn't generate any glyphs for the run.  Give up.
    if (glyphBuffer.isEmpty())
        return;
    
    float afterWidth = it.m_runWidthSoFar;

    if (run.rtl()) {
        float finalRoundingWidth = it.m_finalRoundingWidth;
        it.advance(run.length());
        startX += finalRoundingWidth + it.m_runWidthSoFar - afterWidth;
    } else
        startX += beforeWidth;

    // Swap the order of the glyphs if right-to-left.
    if (run.rtl())
        for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end)
            glyphBuffer.swap(i, end);

    // Calculate the starting point of the glyphs to be displayed by adding
    // all the advances up to the first glyph.
    FloatPoint startPoint(startX, point.y());
    drawGlyphBuffer(context, glyphBuffer, run, startPoint);
}

bool WidthIterator::advanceOneCharacter(float& width, GlyphBuffer& glyphBuffer)
{
    int oldSize = glyphBuffer.size();
    advance(m_currentCharacter + 1, &glyphBuffer);
    float w = 0;
    for (int i = oldSize; i < glyphBuffer.size(); ++i)
        w += glyphBuffer.advanceAt(i);
    width = w;
    return glyphBuffer.size() > oldSize;
}

float Font::getGlyphsAndAdvancesForSimpleText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
    float initialAdvance;

    WidthIterator it(this, run, 0, false, forTextEmphasis);
    // FIXME: Using separate glyph buffers for the prefix and the suffix is incorrect when kerning or
    // ligatures are enabled.
    GlyphBuffer localGlyphBuffer;
    it.advance(from, &localGlyphBuffer);
    float beforeWidth = it.m_runWidthSoFar;
    it.advance(to, &glyphBuffer);

    if (glyphBuffer.isEmpty())
        return 0;

    float afterWidth = it.m_runWidthSoFar;

    if (run.rtl()) {
        float finalRoundingWidth = it.m_finalRoundingWidth;
        it.advance(run.length(), &localGlyphBuffer);
        initialAdvance = finalRoundingWidth + it.m_runWidthSoFar - afterWidth;
    } else {
        initialAdvance = beforeWidth;
    }

    if (run.rtl())
        glyphBuffer.reverse(0, glyphBuffer.size());

    return initialAdvance;
}

TEST(GlyphBufferTest, StoresVerticalOffsets) {
  RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
  RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();

  GlyphBuffer glyphBuffer;
  EXPECT_FALSE(glyphBuffer.hasVerticalOffsets());

  glyphBuffer.add(42, font1.get(), FloatPoint(10, 0));
  glyphBuffer.add(43, font1.get(), FloatPoint(15, 0));
  glyphBuffer.add(44, font2.get(), FloatPoint(12, 2));

  EXPECT_FALSE(glyphBuffer.isEmpty());
  EXPECT_TRUE(glyphBuffer.hasVerticalOffsets());
  EXPECT_EQ(3u, glyphBuffer.size());

  const float* offsets = glyphBuffer.offsets(0);
  EXPECT_EQ(10, glyphBuffer.xOffsetAt(0));
  EXPECT_EQ(0, glyphBuffer.yOffsetAt(0));
  EXPECT_EQ(15, glyphBuffer.xOffsetAt(1));
  EXPECT_EQ(0, glyphBuffer.yOffsetAt(1));
  EXPECT_EQ(12, glyphBuffer.xOffsetAt(2));
  EXPECT_EQ(2, glyphBuffer.yOffsetAt(2));

  EXPECT_EQ(10, offsets[0]);
  EXPECT_EQ(0, offsets[1]);
  EXPECT_EQ(15, offsets[2]);
  EXPECT_EQ(0, offsets[3]);
  EXPECT_EQ(12, offsets[4]);
  EXPECT_EQ(2, offsets[5]);
}

int Font::offsetForPositionForSimpleText(const TextRun& run, float x, bool includePartialGlyphs) const
{
    GlyphBuffer glyphBuffer;
    WidthIterator it(this, run);
    it.advance(run.length(), &glyphBuffer);

    int characterOffset = 0;
    if (run.rtl()) {
        float currentX = it.m_runWidthSoFar;
        for (int glyphPosition = 0; glyphPosition <= glyphBuffer.size(); ++glyphPosition) {
            if (glyphPosition == glyphBuffer.size()) {
                characterOffset = run.length();
                break;
            }
            characterOffset = it.m_characterIndexOfGlyph[glyphPosition];
            float glyphWidth = glyphBuffer.advanceAt(glyphPosition).width();
            if (includePartialGlyphs) {
                if (currentX - glyphWidth / 2.0f <= x)
                    break;
            } else {
                if (currentX - glyphWidth <= x)
                    break;
            }
            currentX -= glyphWidth;
        }
    } else {
        float currentX = 0;
        for (int glyphPosition = 0; glyphPosition <= glyphBuffer.size(); ++glyphPosition) {
            if (glyphPosition == glyphBuffer.size()) {
                characterOffset = run.length();
                break;
            }
            characterOffset = it.m_characterIndexOfGlyph[glyphPosition];
            float glyphWidth = glyphBuffer.advanceAt(glyphPosition).width();
            if (includePartialGlyphs) {
                if (currentX + glyphWidth / 2.0f >= x)
                    break;
            } else {
                if (currentX + glyphWidth >= x)
                    break;
            }
            currentX += glyphWidth;
        }
    }

    return characterOffset;
}

DashArray FontCascade::dashesForIntersectionsWithRect(const TextRun& run, const FloatPoint& textOrigin, const FloatRect& lineExtents) const
{
    if (isLoadingCustomFonts())
        return DashArray();

    GlyphBuffer glyphBuffer;
    glyphBuffer.saveOffsetsInString();
    float deltaX;
    if (codePath(run) != FontCascade::Complex)
        deltaX = getGlyphsAndAdvancesForSimpleText(run, 0, run.length(), glyphBuffer);
    else
        deltaX = getGlyphsAndAdvancesForComplexText(run, 0, run.length(), glyphBuffer);

    if (!glyphBuffer.size())
        return DashArray();

    // FIXME: Handle SVG + non-SVG interleaved runs. https://bugs.webkit.org/show_bug.cgi?id=133778
    FloatPoint origin = FloatPoint(textOrigin.x() + deltaX, textOrigin.y());
    std::unique_ptr<GlyphToPathTranslator> translator = std::make_unique<CairoGlyphToPathTranslator>(run, glyphBuffer, origin);
    DashArray result;
    for (int index = 0; translator->containsMorePaths(); ++index, translator->advance()) {
        float centerOfLine = lineExtents.y() + (lineExtents.height() / 2);
        GlyphIterationState info = GlyphIterationState(FloatPoint(), FloatPoint(), centerOfLine, lineExtents.x() + lineExtents.width(), lineExtents.x());
        const Font* localFontData = glyphBuffer.fontAt(index);
        if (!localFontData) {
            // The advances will get all messed up if we do anything other than bail here.
            result.clear();
            break;
        }
        switch (translator->underlineType()) {
        case GlyphToPathTranslator::GlyphUnderlineType::SkipDescenders: {
            Path path = translator->path();
            path.apply([&info](const PathElement& pathElement) {
                findPathIntersections(info, pathElement);
            });
            if (info.minX < info.maxX) {
                result.append(info.minX - lineExtents.x());
                result.append(info.maxX - lineExtents.x());
            }
            break;
        }
        case GlyphToPathTranslator::GlyphUnderlineType::SkipGlyph: {
            std::pair<float, float> extents = translator->extents();
            result.append(extents.first - lineExtents.x());
            result.append(extents.second - lineExtents.x());
            break;
        }
        case GlyphToPathTranslator::GlyphUnderlineType::DrawOverGlyph:
            // Nothing to do
            break;
        }
    }
    return result;
}

void Font::drawGlyphBuffer(GraphicsContext* context, const TextRun& run, const GlyphBuffer& glyphBuffer, FloatPoint& point) const
{
#if !ENABLE(SVG_FONTS)
    UNUSED_PARAM(run);
#endif

    // Draw each contiguous run of glyphs that use the same font data.
    const SimpleFontData* fontData = glyphBuffer.fontDataAt(0);
    FloatSize offset = glyphBuffer.offsetAt(0);
    FloatPoint startPoint(point.x(), point.y() - glyphBuffer.initialAdvance().height());
    float nextX = startPoint.x() + glyphBuffer.advanceAt(0).width();
    float nextY = startPoint.y() + glyphBuffer.advanceAt(0).height();
    int lastFrom = 0;
    int nextGlyph = 1;
#if ENABLE(SVG_FONTS)
    TextRun::RenderingContext* renderingContext = run.renderingContext();
#endif
    while (nextGlyph < glyphBuffer.size()) {
        const SimpleFontData* nextFontData = glyphBuffer.fontDataAt(nextGlyph);
        FloatSize nextOffset = glyphBuffer.offsetAt(nextGlyph);

        if (nextFontData != fontData || nextOffset != offset) {
#if ENABLE(SVG_FONTS)
            if (renderingContext && fontData->isSVGFont())
                renderingContext->drawSVGGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
            else
#endif
                drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);

            lastFrom = nextGlyph;
            fontData = nextFontData;
            offset = nextOffset;
            startPoint.setX(nextX);
            startPoint.setY(nextY);
        }
        nextX += glyphBuffer.advanceAt(nextGlyph).width();
        nextY += glyphBuffer.advanceAt(nextGlyph).height();
        nextGlyph++;
    }

#if ENABLE(SVG_FONTS)
    if (renderingContext && fontData->isSVGFont())
        renderingContext->drawSVGGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
    else {
#endif
        drawGlyphs(context, fontData, glyphBuffer, lastFrom, nextGlyph - lastFrom, startPoint);
        point.setX(nextX);
#if ENABLE(SVG_FONTS)
    }
#endif
}

float Font::getGlyphsAndAdvancesForComplexText(const TextRun& run, int from, int to, GlyphBuffer& glyphBuffer, ForTextEmphasisOrNot forTextEmphasis) const
{
    float initialAdvance;

    ComplexTextController controller(this, run, false, 0, forTextEmphasis);
    controller.advance(from);
    float beforeWidth = controller.runWidthSoFar();
    controller.advance(to, &glyphBuffer);

    if (glyphBuffer.isEmpty())
        return 0;

    float afterWidth = controller.runWidthSoFar();

    if (run.rtl()) {
        initialAdvance = controller.totalWidth() - afterWidth;
        for (int i = 0, end = glyphBuffer.size() - 1; i < glyphBuffer.size() / 2; ++i, --end)
            glyphBuffer.swap(i, end);
    } else
        initialAdvance = beforeWidth;

    return initialAdvance;
}

SVGGlyphToPathTranslator::SVGGlyphToPathTranslator(const GlyphBuffer& glyphBuffer, const FloatPoint& point, const SVGFontData& svgFontData, SVGFontElement& fontElement, const int from, const int numGlyphs, float scale, bool isVerticalText)
    : m_glyphBuffer(glyphBuffer)
    , m_svgFontData(svgFontData)
    , m_currentPoint(point)
    , m_glyphOrigin(m_svgFontData.horizontalOriginX() * scale, m_svgFontData.horizontalOriginY() * scale)
    , m_index(from)
    , m_glyph(glyphBuffer.glyphAt(m_index))
    , m_fontElement(fontElement)
    , m_stoppingPoint(numGlyphs + from)
    , m_scale(scale)
    , m_isVerticalText(isVerticalText)
{
    ASSERT(glyphBuffer.size() > m_index);
    if (m_glyph) {
        m_svgGlyph = m_fontElement.svgGlyphForGlyph(m_glyph);
        ASSERT(!m_svgGlyph.isPartOfLigature);
        ASSERT(m_svgGlyph.tableEntry == m_glyph);
        SVGGlyphElement::inheritUnspecifiedAttributes(m_svgGlyph, &m_svgFontData);
    }
    moveToNextValidGlyph();
}