rasterize()

bool MayaFlux::Portal::Text::GlyphAtlas::rasterize ( FT_UInt  glyph_index )

private

Definition at line 69 of file GlyphAtlas.cpp.

{
    FT_Face face = m_face.get_face();
 
    if (const FT_Error err = FT_Set_Pixel_Sizes(face, 0, m_pixel_size); err != 0) {
        MF_ERROR(Journal::Component::Portal, Journal::Context::API,
            "FT_Set_Pixel_Sizes({}) failed: {}", m_pixel_size, static_cast<int>(err));
        return false;
    }
 
    if (const FT_Error err = FT_Load_Glyph(face, glyph_index, FT_LOAD_RENDER); err != 0) {
        MF_ERROR(Journal::Component::Portal, Journal::Context::API,
            "FT_Load_Glyph({}) failed: {}", glyph_index, static_cast<int>(err));
        return false;
    }
 
    const FT_Bitmap& bmp = face->glyph->bitmap;
    const uint32_t gw = bmp.width;
    const uint32_t gh = bmp.rows;
 
    constexpr uint32_t k_pad = 1;
 
    if (m_cursor_x + gw + k_pad > m_atlas_size) {
        m_cursor_x = 0;
        m_cursor_y += m_shelf_height + k_pad;
        m_shelf_height = 0;
    }
 
    if (m_cursor_y + gh + k_pad > m_atlas_size) {
        MF_ERROR(Journal::Component::Portal, Journal::Context::API,
            "GlyphAtlas full at pixel_size={} atlas_size={}. "
            "Construct with a larger atlas_size.",
            m_pixel_size, m_atlas_size);
        return false;
    }
 
    const std::span<uint8_t> pixels = m_texture->pixel_bytes(0);
    if (pixels.empty()) {
        MF_ERROR(Journal::Component::Portal, Journal::Context::API,
            "GlyphAtlas: TextureContainer pixel_bytes returned empty span");
        return false;
    }
 
    const uint32_t stride = m_atlas_size;
 
    for (uint32_t row = 0; row < gh; ++row) {
        const uint8_t* src = bmp.buffer + static_cast<size_t>(row * static_cast<uint32_t>(std::abs(bmp.pitch)));
        uint8_t* dst = pixels.data() + static_cast<size_t>((m_cursor_y + row) * stride) + m_cursor_x;
        std::memcpy(dst, src, gw);
    }
 
    const float inv = 1.F / static_cast<float>(m_atlas_size);
 
    GlyphMetrics m;
    m.uv_x0 = static_cast<float>(m_cursor_x) * inv;
    m.uv_y0 = static_cast<float>(m_cursor_y) * inv;
    m.uv_x1 = static_cast<float>(m_cursor_x + gw) * inv;
    m.uv_y1 = static_cast<float>(m_cursor_y + gh) * inv;
    m.bearing_x = face->glyph->bitmap_left;
    m.bearing_y = face->glyph->bitmap_top;
    m.width = gw;
    m.height = gh;
    m.advance_x = static_cast<int32_t>(face->glyph->advance.x >> 6);
 
    m_cache.emplace(glyph_index, m);
 
    m_cursor_x += gw + k_pad;
    if (gh > m_shelf_height) {
        m_shelf_height = gh;
    }
 
    m_dirty = true;
    return true;
}

References MayaFlux::Portal::Text::GlyphMetrics::advance_x, MayaFlux::Journal::API, MayaFlux::Portal::Text::GlyphMetrics::bearing_x, MayaFlux::Portal::Text::GlyphMetrics::bearing_y, MayaFlux::Portal::Text::FontFace::get_face(), MayaFlux::Portal::Text::GlyphMetrics::height, m_atlas_size, m_cache, m_cursor_x, m_cursor_y, m_dirty, m_face, m_pixel_size, m_shelf_height, m_texture, MF_ERROR, pixels, MayaFlux::Journal::Portal, MayaFlux::Portal::Text::GlyphMetrics::uv_x0, MayaFlux::Portal::Text::GlyphMetrics::uv_x1, MayaFlux::Portal::Text::GlyphMetrics::uv_y0, MayaFlux::Portal::Text::GlyphMetrics::uv_y1, and MayaFlux::Portal::Text::GlyphMetrics::width.

Referenced by get_or_rasterize().

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