Commit 0af465b9 authored by Paul Asmuth's avatar Paul Asmuth
Browse files

improved handling of edge cases in the glyph outline conversion code

parent af298bf5

core/graphics/font_lookup.cc

+117 −59
Original line number Diff line number Diff line
@@ -57,12 +57,21 @@ void* font_get_freetype(FontRef font) { 
  return font->ft_font;

}



enum class GlyphPointType : char { ON = 'x', OFF2 = '2', OFF3 = '3' };



struct GlyphContour {

  std::vector<Point> points;

  std::vector<GlyphPointType> tags;

};



ReturnCode font_get_glyph_path(

    FontRef font,

    double font_size,

    double dpi,

    uint32_t codepoint,

    Path* path) {

  *path = Path{};



  // load the glyph using freetype

  auto font_size_ft = font_size * (72.0 / dpi) * 64;

  if (FT_Set_Char_Size(font->ft_font, 0, font_size_ft, dpi, dpi)) {
@@ -85,95 +94,144 @@ ReturnCode font_get_glyph_path( 
  auto glyph_outline = &((FT_OutlineGlyph) glyph)->outline;



  // retrieve the glyph outline data from freetype

  enum class GlyphPointType { MOVE, SIMPLE, CONTROL };



  std::vector<Point> glyph_points;

  std::vector<GlyphPointType> glyph_point_tags;

  std::vector<GlyphContour> contours;



  auto glyph_outline_tags = glyph_outline->tags;

  for (size_t n = 0; n < glyph_outline->n_contours; n++) {

    auto glyph_outline_idx = n == 0 ? 0 : glyph_outline->contours[n - 1] + 1;

    auto glyph_outline_end = glyph_outline->contours[n];



    // read contour points

    GlyphContour contour;

    for (size_t i = glyph_outline_idx; i <= glyph_outline_end; ++i) {

      Point p;

      p.x = glyph_outline->points[i].x / 64.0;

      p.y = -glyph_outline->points[i].y / 64.0;



      GlyphPointType pt;

      if (i == glyph_outline_idx) {

        pt = GlyphPointType::MOVE;

      } else if (int(glyph_outline->tags[i]) & 1) {

        pt = GlyphPointType::SIMPLE;

      } else {

        pt = GlyphPointType::CONTROL;

      switch (FT_CURVE_TAG(glyph_outline->tags[i])) {

        case FT_CURVE_TAG_ON:

          pt = GlyphPointType::ON;

          break;

        case FT_CURVE_TAG_CONIC:

          pt = GlyphPointType::OFF2;

          break;

        case FT_CURVE_TAG_CUBIC:

          pt = GlyphPointType::OFF3;

          break;

        default:

          return ERROR;

      }



      glyph_points.push_back(p);

      glyph_point_tags.push_back(pt);

      contour.points.push_back(p);

      contour.tags.push_back(pt);

    }



    // close the path

    {

      Point p;

      p.x = glyph_outline->points[glyph_outline_idx].x / 64.0;

      p.y = -glyph_outline->points[glyph_outline_idx].y / 64.0;

      glyph_points.push_back(p);

      glyph_point_tags.push_back(GlyphPointType::SIMPLE);

    }

    contours.push_back(contour);

  }



  FT_Done_Glyph(glyph);



  // convert the glyph outline to a path object

  *path = Path{};

  // convert the contours to the output path object

  for (auto& c : contours) {

    if (c.points.empty()) {

      return ERROR;

    }



    // insert virtual "on" points for each pair of successive OFF2 points

    for (size_t i = 0; i + 1 < c.points.size(); ++i) {

      if (c.tags[i + 0] == GlyphPointType::OFF2 &&

          c.tags[i + 1] == GlyphPointType::OFF2) {

        c.tags.insert(

            c.tags.begin() + i + 1,

            GlyphPointType::ON);



  for (size_t i = 0; i < glyph_points.size(); ++i) {

    const auto& p = glyph_points[i];

    const auto& pt = glyph_point_tags[i];

        c.points.insert(

            c.points.begin() + i + 1,

            vec2_mul(vec2_add(c.points[i + 0], c.points[i + 1]), 0.5));

      }

    }



    // edge case: first point can be OFF2 -> start with last point

    if (c.tags.front() == GlyphPointType::OFF2 &&

        c.tags.back() == GlyphPointType::ON) {

      c.points.insert(c.points.begin(), c.points.back());

      c.tags.insert(c.tags.begin(), c.tags.back());

    }



    // move at begin of contour

    if (pt == GlyphPointType::MOVE) {

      path->moveTo(glyph_points[i].x, glyph_points[i].y);

    // edge case: first and last point can be OFF2 -> start with virtual point

    if (c.tags.front() == GlyphPointType::OFF2 &&

        c.tags.back() == GlyphPointType::OFF2) {

      c.points.insert(

          c.points.begin(),

          vec2_mul(vec2_add(c.points.front(), c.points.back()), 0.5));



      c.tags.insert(c.tags.begin(), GlyphPointType::ON);

    }



    // the last point in the contour uses the first as its end point

    c.points.push_back(c.points[0]);

    c.tags.push_back(c.tags[0]);



    // now every contour should end and begin with an "on" point

    assert(c.tags.front() == GlyphPointType::ON);

    assert(c.tags.back() == GlyphPointType::ON);

    assert(c.points.size() == c.tags.size());



    // translate the resolved contour to the path object representation

    path->moveTo(c.points[0].x, c.points[0].y);



    for (size_t i = 0; i < c.points.size() - 1; ) {

      const auto& p = c.points[i];

      const auto& pt = c.tags[i];



      // line segment

      if (i + 1 < c.points.size() &&

          c.tags[i + 0] == GlyphPointType::ON &&

          c.tags[i + 1] == GlyphPointType::ON) {

        path->lineTo(c.points[i + 1].x, c.points[i + 1].y);

        i += 1;

        continue;

      }



      // third order bezier

    if (i + 2 < glyph_points.size() &&

        glyph_point_tags[i + 0] == GlyphPointType::CONTROL &&

        glyph_point_tags[i + 1] == GlyphPointType::CONTROL) {

      //assert(glyph_point_tags[i + 2] != GlyphPointType::CONTROL);



      if (i + 3 < c.points.size() &&

          c.tags[i + 0] == GlyphPointType::ON &&

          c.tags[i + 1] == GlyphPointType::OFF3 &&

          c.tags[i + 2] == GlyphPointType::OFF3 &&

          c.tags[i + 3] == GlyphPointType::ON) {

        path->cubicCurveTo(

          glyph_points[i + 0].x,

          glyph_points[i + 0].y,

          glyph_points[i + 1].x,

          glyph_points[i + 1].y,

          glyph_points[i + 2].x,

          glyph_points[i + 2].y);



      i += 2;

            c.points[i + 1].x,

            c.points[i + 1].y,

            c.points[i + 2].x,

            c.points[i + 2].y,

            c.points[i + 3].x,

            c.points[i + 3].y);



        i += 3;

        continue;

      }



      // second order bezier

    if (i + 1 < glyph_points.size() &&

        glyph_point_tags[i] == GlyphPointType::CONTROL) {

      //assert(glyph_point_tags[i + 1] != GlyphPointType::CONTROL);



      if (i + 2 < c.points.size() &&

          c.tags[i + 0] == GlyphPointType::ON &&

          c.tags[i + 1] == GlyphPointType::OFF2 &&

          c.tags[i + 2] == GlyphPointType::ON) {

        path->quadraticCurveTo(

          glyph_points[i + 0].x,

          glyph_points[i + 0].y,

          glyph_points[i + 1].x,

          glyph_points[i + 1].y);

            c.points[i + 1].x,

            c.points[i + 1].y,

            c.points[i + 2].x,

            c.points[i + 2].y);



      i += 1;

        i += 2;

        continue;

      }



    // simple line segments

    path->lineTo(glyph_points[i].x, glyph_points[i].y);

      // invalid contour

      break;

    }



    // close the path

    path->closePath();

  }



  return OK;

core/graphics/layer_svg.cc

+2 −0
Original line number Diff line number Diff line
@@ -95,6 +95,8 @@ std::string svg_path_data(const Path& path) { 
        path_data << fmt::format("a{} {} 0 1 0 {} 0 ", cmd[2], cmd[2], cmd[2] * 2);

        path_data << fmt::format("a{} {} 0 1 0 {} 0 ", cmd[2], cmd[2], -cmd[2] * 2);

        break;

      case PathCommand::CLOSE:

        path_data << "Z";

      default:

        break; // not yet implemented

    }

examples/charts-basic/areachart.svg

+1 −1
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ 
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examples/charts-basic/areas_and_lines.svg

+2 −2
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examples/charts-basic/areas_vertical.svg

+1 −1
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