diff options
Diffstat (limited to 'svg-flatten/src/svg_path.cpp')
| -rw-r--r-- | svg-flatten/src/svg_path.cpp | 47 |
1 files changed, 31 insertions, 16 deletions
diff --git a/svg-flatten/src/svg_path.cpp b/svg-flatten/src/svg_path.cpp index e45a0c9..68003ad 100644 --- a/svg-flatten/src/svg_path.cpp +++ b/svg-flatten/src/svg_path.cpp @@ -32,7 +32,7 @@ static void clipper_add_cairo_path(cairo_t *cr, ClipperLib::Clipper &c, bool clo c.AddPaths(in_poly, ClipperLib::ptSubject, closed); } -static bool path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c, const pugi::char_t *path_data) { +static pair<bool, bool> path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c_stroke, ClipperLib::Clipper &c_fill, const pugi::char_t *path_data) { istringstream d(path_data); string cmd; @@ -41,6 +41,7 @@ static bool path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c, const bool first = true; bool has_closed = false; bool path_is_empty = true; + int num_subpaths = 0; while (!d.eof()) { d >> cmd; assert (!d.fail()); @@ -48,12 +49,23 @@ static bool path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c, const if (cmd == "Z") { /* Close path */ cairo_close_path(cr); - clipper_add_cairo_path(cr, c, /* closed= */ true); + clipper_add_cairo_path(cr, c_stroke, /* closed= */ true); + clipper_add_cairo_path(cr, c_fill, /* closed= */ true); has_closed = true; cairo_new_path(cr); path_is_empty = true; + num_subpaths += 1; } else if (cmd == "M") { /* Move to */ + if (!first && !path_is_empty) { + cairo_close_path(cr); + clipper_add_cairo_path(cr, c_stroke, /* closed= */ false); + clipper_add_cairo_path(cr, c_fill, /* closed= */ true); + num_subpaths += 1; + } + + cairo_new_path (cr); + d >> x >> y; /* We need to transform all points ourselves here, and cannot use the transform feature of cairo_to_clipper: * Our transform may contain offsets, and clipper only passes its data into cairo's transform functions @@ -63,10 +75,6 @@ static bool path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c, const */ cairo_user_to_device(cr, &x, &y); assert (!d.fail()); - if (!first) { - clipper_add_cairo_path(cr, c, /* closed= */ false); - } - cairo_new_path (cr); path_is_empty = true; cairo_move_to(cr, x, y); @@ -94,13 +102,15 @@ static bool path_to_clipper_via_cairo(cairo_t *cr, ClipperLib::Clipper &c, const } if (!path_is_empty) { cairo_close_path(cr); - clipper_add_cairo_path(cr, c, /* closed= */ false); + clipper_add_cairo_path(cr, c_stroke, /* closed= */ false); + clipper_add_cairo_path(cr, c_fill, /* closed= */ true); + num_subpaths += 1; } - return has_closed; + return {has_closed, num_subpaths > 1}; } -void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLib::PolyTree &ptree) { +void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLib::PolyTree &ptree_stroke, ClipperLib::PolyTree &ptree_fill) { auto *path_data = node.attribute("d").value(); auto fill_rule = clipper_fill_rule(node); @@ -110,11 +120,14 @@ void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLi cairo_set_tolerance (cr, 0.1); /* FIXME make configurable, scale properly for units */ cairo_set_fill_rule(cr, CAIRO_FILL_RULE_WINDING); - ClipperLib::Clipper c; - c.StrictlySimple(true); - bool has_closed = path_to_clipper_via_cairo(cr, c, path_data); + ClipperLib::Clipper c_stroke; + ClipperLib::Clipper c_fill; + c_stroke.StrictlySimple(true); + c_fill.StrictlySimple(true); + auto res = path_to_clipper_via_cairo(cr, c_stroke, c_fill, path_data); + bool has_closed = res.first, has_multiple = res.second; - if (!has_closed) { + if (!has_closed && !has_multiple) { /* FIXME: Workaround! * * When we render silkscreen layers from gerbv's output, we get a lot of two-point paths (lines). Many of these are @@ -132,12 +145,14 @@ void gerbolyze::load_svg_path(cairo_t *cr, const pugi::xml_node &node, ClipperLi auto le_min = -ClipperLib::loRange; auto le_max = ClipperLib::hiRange; ClipperLib::Path p = {{le_min, le_min}, {le_max, le_min}, {le_max, le_max}, {le_min, le_max}}; - c.AddPath(p, ClipperLib::ptClip, /* closed= */ true); - c.Execute(ClipperLib::ctIntersection, ptree, fill_rule, ClipperLib::pftNonZero); + c_stroke.AddPath(p, ClipperLib::ptClip, /* closed= */ true); + c_stroke.Execute(ClipperLib::ctIntersection, ptree_stroke, fill_rule, ClipperLib::pftNonZero); + ptree_fill.Clear(); } else { /* We cannot clip the polygon here since that would produce incorrect results for our stroke. */ - c.Execute(ClipperLib::ctUnion, ptree, fill_rule, ClipperLib::pftNonZero); + c_stroke.Execute(ClipperLib::ctUnion, ptree_stroke, fill_rule, ClipperLib::pftNonZero); + c_fill.Execute(ClipperLib::ctUnion, ptree_fill, fill_rule, ClipperLib::pftNonZero); } } |