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gl_engine: Support StrokeCap in GlTessellator

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Add new function `strokeSquare` and `strokeRound` to handle StrokeCap
during Path tessellation
This commit is contained in:
RuiwenTang 2024-05-25 11:51:57 +08:00 • committed by Hermet Park
parent e6deee7fd8
commit 25dbf4aacf
2 changed files with 55 additions and 0 deletions
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51
src/renderer/gl_engine/tvgGlTessellator.cpp
View file

@ -1712,6 +1712,8 @@ void Stroker::doStroke(const PathCommand *cmds, uint32_t cmd_count, const Point
break;
}
}
strokeCap();
}
void Stroker::doDashStroke(const PathCommand *cmds, uint32_t cmd_count, const Point *pts, uint32_t pts_count,
@ -1732,6 +1734,19 @@ void Stroker::doDashStroke(const PathCommand *cmds, uint32_t cmd_count, const Po
void Stroker::strokeCap()
{
if (mStrokeState.firstPt == mStrokeState.prevPt) {
return;
}
if (mStrokeCap == StrokeCap::Butt) return;
else if (mStrokeCap == StrokeCap::Square) {
strokeSquare(mStrokeState.firstPt, GlPoint{-mStrokeState.firstPtDir.x, -mStrokeState.firstPtDir.y});
strokeSquare(mStrokeState.prevPt, mStrokeState.prevPtDir);
} else if (mStrokeCap == StrokeCap::Round) {
strokeRound(mStrokeState.firstPt, GlPoint{-mStrokeState.firstPtDir.x, -mStrokeState.firstPtDir.y});
strokeRound(mStrokeState.prevPt, mStrokeState.prevPtDir);
}
}
void Stroker::strokeLineTo(const GlPoint &curr)
@ -1963,6 +1978,42 @@ void Stroker::strokeBevel(const GlPoint &prev, const GlPoint &curr, const GlPoin
mResIndices->push(c);
}
void Stroker::strokeSquare(const GlPoint& p, const GlPoint& outDir)
{
GlPoint normal{-outDir.y, outDir.x};
GlPoint a = p + normal * strokeRadius();
GlPoint b = p - normal * strokeRadius();
GlPoint c = a + outDir * strokeRadius();
GlPoint d = b + outDir * strokeRadius();
auto ai = detail::_pushVertex(mResGlPoints, a.x, a.y);
auto bi = detail::_pushVertex(mResGlPoints, b.x, b.y);
auto ci = detail::_pushVertex(mResGlPoints, c.x, c.y);
auto di = detail::_pushVertex(mResGlPoints, d.x, d.y);
mResIndices->push(ai);
mResIndices->push(bi);
mResIndices->push(ci);
mResIndices->push(ci);
mResIndices->push(bi);
mResIndices->push(di);
}
void Stroker::strokeRound(const GlPoint& p, const GlPoint& outDir)
{
GlPoint normal{-outDir.y, outDir.x};
GlPoint a = p + normal * strokeRadius();
GlPoint b = p - normal * strokeRadius();
GlPoint c = p + outDir * strokeRadius();
strokeRound(a, c, p);
strokeRound(c, b, p);
}
DashStroke::DashStroke(Array<PathCommand> *cmds, Array<Point> *pts, uint32_t dash_count, const float *dash_pattern)
: mCmds(cmds),
mPts(pts),

4
src/renderer/gl_engine/tvgGlTessellator.h
View file

@ -140,6 +140,10 @@ private:
void strokeMiter(const GlPoint &prev, const GlPoint &curr, const GlPoint &center);
void strokeBevel(const GlPoint &prev, const GlPoint &curr, const GlPoint &center);
void strokeSquare(const GlPoint& p, const GlPoint& outDir);
void strokeRound(const GlPoint& p, const GlPoint& outDir);
private:
Array<float>* mResGlPoints;
Array<uint32_t>* mResIndices;