C++ FontFace::GetGlyph方法代码示例

void Text::UpdateCharLocations()
{
    // Remember the font face to see if it's still valid when it's time to render
    FontFace* face = font_ ? font_->GetFace(fontSize_) : nullptr;
    if (!face)
        return;
    fontFace_ = face;

    auto rowHeight = RoundToInt(rowSpacing_ * rowHeight_);

    // Store position & size of each character, and locations per texture page
    unsigned numChars = unicodeText_.size();
    charLocations_.resize(numChars + 1);
    pageGlyphLocations_.resize(face->GetTextures().size());
    for (unsigned i = 0; i < pageGlyphLocations_.size(); ++i)
        pageGlyphLocations_[i].clear();

    IntVector2 offset = font_->GetTotalGlyphOffset(fontSize_);

    unsigned rowIndex = 0;
    unsigned lastFilled = 0;
    float x = Round(GetRowStartPosition(rowIndex) + offset.x_);
    float y = Round(offset.y_);

    for (unsigned i = 0; i < printText_.size(); ++i)
    {
        CharLocation loc;
        loc.position_ = Vector2(x, y);

        unsigned c = printText_[i];
        if (c != '\n')
        {
            const FontGlyph* glyph = face->GetGlyph(c);
            loc.size_ = Vector2(glyph ? glyph->advanceX_ : 0, rowHeight_);
            if (glyph)
            {
                // Store glyph's location for rendering. Verify that glyph page is valid
                if (glyph->page_ < pageGlyphLocations_.size())
                    pageGlyphLocations_[glyph->page_].push_back(GlyphLocation(x, y, glyph));
                x += glyph->advanceX_;
                if (i < printText_.size() - 1)
                    x += face->GetKerning(c, printText_[i + 1]);
            }
        }
        else
        {
            loc.size_ = Vector2::ZERO;
            x = GetRowStartPosition(++rowIndex);
            y += rowHeight;
        }

        if (lastFilled > printToText_[i])
            lastFilled = printToText_[i];

        // Fill gaps in case characters were skipped from printing
        for (unsigned j = lastFilled; j <= printToText_[i]; ++j)
            charLocations_[j] = loc;
        lastFilled = printToText_[i] + 1;
    }
    // Store the ending position
    charLocations_[numChars].position_ = Vector2(x, y);
    charLocations_[numChars].size_ = Vector2::ZERO;

    charLocationsDirty_ = false;
}

void Text::GetBatches(ea::vector<UIBatch>& batches, ea::vector<float>& vertexData, const IntRect& currentScissor)
{
    FontFace* face = font_ ? font_->GetFace(fontSize_) : nullptr;
    if (!face)
    {
        hovering_ = false;
        return;
    }

    // If face has changed or char locations are not valid anymore, update before rendering
    if (charLocationsDirty_ || !fontFace_ || face != fontFace_)
        UpdateCharLocations();
    // If face uses mutable glyphs mechanism, reacquire glyphs before rendering to make sure they are in the texture
    else if (face->HasMutableGlyphs())
    {
        for (unsigned i = 0; i < printText_.size(); ++i)
            face->GetGlyph(printText_[i]);
    }

    // Hovering and/or whole selection batch
    UISelectable::GetBatches(batches, vertexData, currentScissor);

    // Partial selection batch
    if (!selected_ && selectionLength_ && charLocations_.size() >= selectionStart_ + selectionLength_ && selectionColor_.a_ > 0.0f)
    {
        UIBatch batch(this, BLEND_ALPHA, currentScissor, nullptr, &vertexData);
        batch.SetColor(selectionColor_);

        Vector2 currentStart = charLocations_[selectionStart_].position_;
        Vector2 currentEnd = currentStart;
        for (unsigned i = selectionStart_; i < selectionStart_ + selectionLength_; ++i)
        {
            // Check if row changes, and start a new quad in that case
            if (charLocations_[i].size_ != Vector2::ZERO)
            {
                if (charLocations_[i].position_.y_ != currentStart.y_)
                {
                    batch.AddQuad(currentStart.x_, currentStart.y_, currentEnd.x_ - currentStart.x_,
                        currentEnd.y_ - currentStart.y_, 0, 0);
                    currentStart = charLocations_[i].position_;
                    currentEnd = currentStart + charLocations_[i].size_;
                }
                else
                {
                    currentEnd.x_ += charLocations_[i].size_.x_;
                    currentEnd.y_ = Max(currentStart.y_ + charLocations_[i].size_.y_, currentEnd.y_);
                }
            }
        }
        if (currentEnd != currentStart)
        {
            batch.AddQuad(currentStart.x_, currentStart.y_, currentEnd.x_ - currentStart.x_, currentEnd.y_ - currentStart.y_, 0, 0);
        }

        UIBatch::AddOrMerge(batch, batches);
    }

    // Text batch
    TextEffect textEffect = font_->IsSDFFont() ? TE_NONE : textEffect_;
    const ea::vector<ea::shared_ptr<Texture2D> >& textures = face->GetTextures();
    for (unsigned n = 0; n < textures.size() && n < pageGlyphLocations_.size(); ++n)
    {
        // One batch per texture/page
        UIBatch pageBatch(this, BLEND_ALPHA, currentScissor, textures[n], &vertexData);

        const ea::vector<GlyphLocation>& pageGlyphLocation = pageGlyphLocations_[n];

        switch (textEffect)
        {
        case TE_NONE:
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 0);
            break;

        case TE_SHADOW:
            ConstructBatch(pageBatch, pageGlyphLocation, shadowOffset_.x_, shadowOffset_.y_, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 0);
            break;

        case TE_STROKE:
            if (roundStroke_)
            {
                // Samples should be even or glyph may be redrawn in wrong x y pos making stroke corners rough
                // Adding to thickness helps with thickness of 1 not having enought samples for this formula
                // or certain fonts with reflex corners requiring more glyph samples for a smooth stroke when large
                int thickness = Min(strokeThickness_, fontSize_);
                int samples = thickness * thickness + (thickness % 2 == 0 ? 4 : 3);
                float angle = 360.f / samples;
                auto floatThickness = (float)thickness;
                for (int i = 0; i < samples; ++i)
                {
                    float x = Cos(angle * i) * floatThickness;
                    float y = Sin(angle * i) * floatThickness;
                    ConstructBatch(pageBatch, pageGlyphLocation, x, y, &effectColor_, effectDepthBias_);
                }
            }
            else
            {
                int thickness = Min(strokeThickness_, fontSize_);
                int x, y;
                for (x = -thickness; x <= thickness; ++x)
//.........这里部分代码省略.........

void Text::UpdateText(bool onResize)
{
    rowWidths_.clear();
    printText_.clear();

    if (font_)
    {
        FontFace* face = font_->GetFace(fontSize_);
        if (!face)
            return;

        rowHeight_ = face->GetRowHeight();

        int width = 0;
        int height = 0;
        int rowWidth = 0;
        auto rowHeight = RoundToInt(rowSpacing_ * rowHeight_);

        // First see if the text must be split up
        if (!wordWrap_)
        {
            printText_ = unicodeText_;
            printToText_.resize(printText_.size());
            for (unsigned i = 0; i < printText_.size(); ++i)
                printToText_[i] = i;
        }
        else
        {
            int maxWidth = GetWidth();
            unsigned nextBreak = 0;
            unsigned lineStart = 0;
            printToText_.clear();

            for (unsigned i = 0; i < unicodeText_.size(); ++i)
            {
                unsigned j;
                unsigned c = unicodeText_[i];

                if (c != '\n')
                {
                    bool ok = true;

                    if (nextBreak <= i)
                    {
                        int futureRowWidth = rowWidth;
                        for (j = i; j < unicodeText_.size(); ++j)
                        {
                            unsigned d = unicodeText_[j];
                            if (d == ' ' || d == '\n')
                            {
                                nextBreak = j;
                                break;
                            }
                            const FontGlyph* glyph = face->GetGlyph(d);
                            if (glyph)
                            {
                                futureRowWidth += glyph->advanceX_;
                                if (j < unicodeText_.size() - 1)
                                    futureRowWidth += face->GetKerning(d, unicodeText_[j + 1]);
                            }
                            if (d == '-' && futureRowWidth <= maxWidth)
                            {
                                nextBreak = j + 1;
                                break;
                            }
                            if (futureRowWidth > maxWidth)
                            {
                                ok = false;
                                break;
                            }
                        }
                    }

                    if (!ok)
                    {
                        // If did not find any breaks on the line, copy until j, or at least 1 char, to prevent infinite loop
                        if (nextBreak == lineStart)
                        {
                            while (i < j)
                            {
                                printText_.push_back(unicodeText_[i]);
                                printToText_.push_back(i);
                                ++i;
                            }
                        }
                        // Eliminate spaces that have been copied before the forced break
                        while (printText_.size() && printText_.back() == ' ')
                        {
                            printText_.pop_back();
                            printToText_.pop_back();
                        }
                        printText_.push_back('\n');
                        printToText_.push_back(Min(i, unicodeText_.size() - 1));
                        rowWidth = 0;
                        nextBreak = lineStart = i;
                    }

                    if (i < unicodeText_.size())
                    {
                        // When copying a space, position is allowed to be over row width
//.........这里部分代码省略.........

void Text::GetBatches(PODVector<UIBatch>& batches, PODVector<float>& vertexData, const IntRect& currentScissor)
{
    FontFace* face = font_ ? font_->GetFace(fontSize_) : (FontFace*)0;
    if (!face)
    {
        hovering_ = false;
        return;
    }

    // If face has changed or char locations are not valid anymore, update before rendering
    if (charLocationsDirty_ || !fontFace_ || face != fontFace_)
        UpdateCharLocations();
    // If face uses mutable glyphs mechanism, reacquire glyphs before rendering to make sure they are in the texture
    else if (face->HasMutableGlyphs())
    {
        for (unsigned i = 0; i < printText_.Size(); ++i)
            face->GetGlyph(printText_[i]);
    }

    // Hovering and/or whole selection batch
    if ((hovering_ && hoverColor_.a_ > 0.0) || (selected_ && selectionColor_.a_ > 0.0f))
    {
        bool both = hovering_ && selected_ && hoverColor_.a_ > 0.0 && selectionColor_.a_ > 0.0f;
        UIBatch batch(this, BLEND_ALPHA, currentScissor, 0, &vertexData);
        batch.SetColor(both ? selectionColor_.Lerp(hoverColor_, 0.5f) :
            (selected_ && selectionColor_.a_ > 0.0f ? selectionColor_ : hoverColor_));
        batch.AddQuad(0, 0, GetWidth(), GetHeight(), 0, 0);
        UIBatch::AddOrMerge(batch, batches);
    }

    // Partial selection batch
    if (!selected_ && selectionLength_ && charLocations_.Size() >= selectionStart_ + selectionLength_ && selectionColor_.a_ > 0.0f)
    {
        UIBatch batch(this, BLEND_ALPHA, currentScissor, 0, &vertexData);
        batch.SetColor(selectionColor_);

        IntVector2 currentStart = charLocations_[selectionStart_].position_;
        IntVector2 currentEnd = currentStart;
        for (unsigned i = selectionStart_; i < selectionStart_ + selectionLength_; ++i)
        {
            // Check if row changes, and start a new quad in that case
            if (charLocations_[i].size_ != IntVector2::ZERO)
            {
                if (charLocations_[i].position_.y_ != currentStart.y_)
                {
                    batch.AddQuad(currentStart.x_, currentStart.y_, currentEnd.x_ - currentStart.x_,
                        currentEnd.y_ - currentStart.y_, 0, 0);
                    currentStart = charLocations_[i].position_;
                    currentEnd = currentStart + charLocations_[i].size_;
                }
                else
                {
                    currentEnd.x_ += charLocations_[i].size_.x_;
                    currentEnd.y_ = Max(currentStart.y_ + charLocations_[i].size_.y_, currentEnd.y_);
                }
            }
        }
        if (currentEnd != currentStart)
        {
            batch.AddQuad(currentStart.x_, currentStart.y_, currentEnd.x_ - currentStart.x_, currentEnd.y_ - currentStart.y_, 0, 0);
        }

        UIBatch::AddOrMerge(batch, batches);
    }

    // Text batch
    TextEffect textEffect = font_->IsSDFFont() ? TE_NONE : textEffect_;
    const Vector<SharedPtr<Texture2D> >& textures = face->GetTextures();
    for (unsigned n = 0; n < textures.Size() && n < pageGlyphLocations_.Size(); ++n)
    {
        // One batch per texture/page
        UIBatch pageBatch(this, BLEND_ALPHA, currentScissor, textures[n], &vertexData);

        const PODVector<GlyphLocation>& pageGlyphLocation = pageGlyphLocations_[n];

        switch (textEffect)
        {
        case TE_NONE:
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 0);
            break;

        case TE_SHADOW:
            ConstructBatch(pageBatch, pageGlyphLocation, 1, 1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 0);
            break;

        case TE_STROKE:
            ConstructBatch(pageBatch, pageGlyphLocation, -1, -1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 0, -1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 1, -1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, -1, 0, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 1, 0, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, -1, 1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 1, 1, &effectColor_, effectDepthBias_);
            ConstructBatch(pageBatch, pageGlyphLocation, 0, 0);
            break;
        }

        UIBatch::AddOrMerge(pageBatch, batches);
//.........这里部分代码省略.........