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svg-flatten: outline mode WIP

wip
jaseg 2022-06-20 18:48:17 +02:00
rodzic e4a0c1ba4a
commit 2fc5d1d929
1 zmienionych plików z 24 dodań i 7 usunięć
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31
svg-flatten/src/svg_doc.cpp
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@ -354,6 +354,26 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
offx.ArcTolerance = 0.01 * clipper_scale; /* 10µm; TODO: Make this configurable */
offx.MiterLimit = stroke_miterlimit;
/* We forward strokes as regular gerber interpolations instead of tracing their outline using clipper when one
* of these is true:
*
* (1) Global outline mode is enabled (-o gerber-outline).
* (2) The stroke has round joins and ends and no clip is set.
*
* We have to ignore patterned strokes since then we recursively call down to the pattern renderer. The checks
* in (2) are to make sure that the semantics of our source SVG align with gerber's aperture semantics. Gerber
* cannot express anything other than "round" joins and ends. If a clip is set, the clipped line ends would not
* be round so we have to exclude that as well. A possible future optimization would be to check if we actually
* did clip the stroke, but that is too expensive since then we'd have to outline it first to account for
* stroke thickness and end caps.
*/
bool local_outline_mode =
stroke_color != GRB_PATTERN_FILL && (
ctx.settings().outline_mode || (
ctx.clip().empty() &&
end_type == ClipperLib::etOpenRound &&
join_type == ClipperLib::jtRound));
/* For stroking we have to separately handle open and closed paths */
for (auto &poly : stroke_closed) {
if (poly.empty())
@ -362,8 +382,7 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
/* Special case: A closed path becomes a number of open paths when it is dashed. */
if (dasharray.empty()) {
if (ctx.settings().outline_mode && stroke_color != GRB_PATTERN_FILL) {
cerr << "add closed path of size " << poly.size() << endl;
if (local_outline_mode) {
stroke_clip.AddPath(poly, ptSubject, /* closed */ true);
} else {
offx.AddPath(poly, join_type, etClosedLine);
@ -375,8 +394,7 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
Paths out;
dash_path(poly_copy, out, dasharray, stroke_dashoffset);
if (ctx.settings().outline_mode && stroke_color != GRB_PATTERN_FILL) {
cerr << "add open path dashes of size " << out.size() << endl;
if (local_outline_mode) {
stroke_clip.AddPaths(out, ptSubject, /* closed */ false);
} else {
offx.AddPaths(out, join_type, end_type);
@ -388,15 +406,14 @@ void gerbolyze::SVGDocument::export_svg_path(RenderContext &ctx, const pugi::xml
Paths out;
dash_path(poly, out, dasharray, stroke_dashoffset);
if (ctx.settings().outline_mode && stroke_color != GRB_PATTERN_FILL) {
cerr << "add open paths of size " << out.size() << endl;
if (ctx.settings().outline_mode) {
stroke_clip.AddPaths(out, ptSubject, /* closed */ false);
} else {
offx.AddPaths(out, join_type, end_type);
}
}
if (ctx.settings().outline_mode && stroke_color != GRB_PATTERN_FILL) {
if (ctx.settings().outline_mode) {
stroke_clip.Execute(ctIntersection, ptree, pftNonZero, pftNonZero);
Paths outline_paths;
ctx.sink() << ApertureToken(stroke_width);