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+% Copyright 2019 by an anonymous contributor
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU General Public License.
+%
+% See the file doc/generic/pgf/licenses/LICENSE for more details.
+
+\global\let\pgf@bbox@lt@curveto@normal\pgf@lt@curveto
+\global\let\pgf@bbox@nlt@curveto@normal\pgf@nlt@curveto
+
+\pgfqkeys{/pgf}{bezier bounding box/.is if=pgf@bbox@switch@}
+
+\def\pgf@bbox@switch@false{%
+ \let\pgf@lt@curveto \pgf@bbox@lt@curveto@normal
+ \let\pgf@nlt@curveto\pgf@bbox@nlt@curveto@normal
+}
+
+\def\pgf@bbox@switch@true{%
+ \let\pgf@lt@curveto \pgf@bbox@curveto
+ \let\pgf@nlt@curveto\pgf@bbox@curveto
+}
+
+\def\pgf@bbox@curveto#1#2#3#4#5#6{%
+ % extrema in x
+ \pgfmathsetmacro{\pgf@temp@b}{abs(\pgf@path@lastx-#5-3*#1+3*#3)}%
+ % ^^^ this is used for the denominator below, cannot become too small
+ \pgfmathsetmacro{\pgf@temp@c}{max(1+\pgf@path@lastx,max(#1,max(#3,#5)))}%
+ % ^^^ in order to avoid dimension too large errors from squaring lengths in pt
+ \pgfmathparse{((#1/\pgf@temp@c)*(#1/\pgf@temp@c)-1*((#1/\pgf@temp@c)*(#3/\pgf@temp@c))+(#3/\pgf@temp@c)*(#3/\pgf@temp@c)-1*((#1/\pgf@temp@c)*(#5/\pgf@temp@c))+(-(#3/\pgf@temp@c)+(#5/\pgf@temp@c))*(\pgf@path@lastx/\pgf@temp@c))}%
+ \pgfutil@tempdima=\pgfmathresult pt\relax%
+ % ^^^ discriminant
+ \ifdim\pgf@temp@b pt<0.01pt\relax%
+ % approximately linear
+ \pgfmathparse{abs(2*(#1)-2*(#3)+(#5))}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \ifdim\pgfutil@tempdimb<0.1pt\relax%
+ % if the denominator is very small, t is *likely* large but could be 0/0
+ \else
+ \pgfmathsetmacro{\pgf@temp@a}{(2*(#1)-3*(#3)+(#5))/(2*(#1)-2*(#3)+(#5))}%
+ \pgfmathparse{\pgf@path@lastx*pow(1-\pgf@temp@a,3)+3*#1*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#3*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#5*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{\pgfutil@tempdimb}{#6}%
+ \fi%
+ \else
+ \ifdim\pgfutil@tempdima<0pt\relax% negative discriminant -> no turning point
+ \else
+ \pgfmathsetmacro{\pgf@temp@a}{min(1,max(0,(\pgf@path@lastx-2*#1+#3-\pgf@temp@c*sqrt(\pgfutil@tempdima))/(\pgf@path@lastx-#5-3*#1+3*#3)))}%
+ \pgfmathparse{\pgf@path@lastx*pow(1-\pgf@temp@a,3)+3*#1*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#3*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#5*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{\pgfutil@tempdimb}{#6}%
+ \pgfmathsetmacro{\pgf@temp@a}{min(1,max(0,(\pgf@path@lastx-2*#1+#3+\pgf@temp@c*sqrt(\pgfutil@tempdima))/(\pgf@path@lastx-#5-3*#1+3*#3)))}%
+ \pgfmathparse{\pgf@path@lastx*pow(1-\pgf@temp@a,3)+3*#1*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#3*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#5*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{\pgfutil@tempdimb}{#6}%
+ \fi%
+ \fi
+ %%%%%%%%%%%%%%%%%%%%%%%%%%%
+ % extrema in y (completely analogous to the above)
+ \pgfmathsetmacro{\pgf@temp@b}{abs(\pgf@path@lasty-#6-3*#2+3*#4)}%
+ \pgfmathsetmacro{\pgf@temp@c}{max(1+\pgf@path@lasty,max(#2,max(#4,#6)))}%
+ \pgfmathparse{((#2/\pgf@temp@c)*(#2/\pgf@temp@c)-1*((#2/\pgf@temp@c)*(#4/\pgf@temp@c))+(#4/\pgf@temp@c)*(#4/\pgf@temp@c)-1*((#2/\pgf@temp@c)*(#6/\pgf@temp@c))+(-(#4/\pgf@temp@c)+(#6/\pgf@temp@c))*(\pgf@path@lasty/\pgf@temp@c))}%
+ \pgfutil@tempdima=\pgfmathresult pt\relax%
+ % ^^^ discriminant
+ \ifdim\pgf@temp@b pt<0.01pt\relax%
+ % approximately linear
+ \pgfmathparse{abs(2*(#2)-2*(#4)+(#6))}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \ifdim\pgfutil@tempdimb<0.1pt\relax%
+ % if the denominator is very small, t is *likely* large but could be 0/0
+ \else
+ \pgfmathsetmacro{\pgf@temp@a}{(2*(#2)-3*(#4)+(#6))/(2*(#2)-2*(#4)+(#6))}%
+ \pgfmathparse{\pgf@path@lasty*pow(1-\pgf@temp@a,3)+3*#2*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#4*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#6*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{#5}{\pgfutil@tempdimb}%
+ \fi%
+ \else
+ \ifdim\pgfutil@tempdima<0pt\relax% negative discriminant -> no turning point
+ \else
+ \pgfmathsetmacro{\pgf@temp@a}{min(1,max(0,(\pgf@path@lasty-2*#2+#4-\pgf@temp@c*sqrt(\pgfutil@tempdima))/(\pgf@path@lasty-#6-3*#2+3*#4)))}%
+ \pgfmathparse{\pgf@path@lasty*pow(1-\pgf@temp@a,3)+3*#2*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#4*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#6*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{#5}{\pgfutil@tempdimb}%
+ \pgfmathsetmacro{\pgf@temp@a}{min(1,max(0,(\pgf@path@lasty-2*#2+#4+\pgf@temp@c*sqrt(\pgfutil@tempdima))/(\pgf@path@lasty-#6-3*#2+3*#4)))}%
+ \pgfmathparse{\pgf@path@lasty*pow(1-\pgf@temp@a,3)+3*#2*pow(1-\pgf@temp@a,2)*\pgf@temp@a+3*#4*(1-\pgf@temp@a)*\pgf@temp@a*\pgf@temp@a+#6*pow(\pgf@temp@a,3)}%
+ \pgfutil@tempdimb=\pgfmathresult pt\relax%
+ \pgf@protocolsizes{#5}{\pgfutil@tempdimb}%
+ \fi%
+ \fi
+ \pgf@protocolsizes{\pgf@path@lastx}{\pgf@path@lasty}%
+ \pgf@protocolsizes{#5}{#6}%
+ \pgfsyssoftpath@curveto{\the#1}{\the#2}{\the#3}{\the#4}{\the#5}{\the#6}%
+}