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Build zig-zag path in a preallocated buffer.

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Bartosz Taudul 2021-05-02 02:17:59 +02:00
parent 0525cbc791
commit ab627f9da2
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GPG Key ID: B7FE2008B7575DF3
1 changed files with 23 additions and 13 deletions
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36
server/TracyView.cpp
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@ -2,6 +2,12 @@
# pragma warning( disable: 4267 ) // conversion from don't care to whatever, possible loss of data
#endif
#ifdef _WIN32
# include <malloc.h>
#else
# include <alloca.h>
#endif
#ifdef __MINGW32__
# define __STDC_FORMAT_MACROS
#endif
@ -2393,42 +2399,46 @@ static uint32_t MixGhostColor( uint32_t c0, uint32_t c1 )
static void DrawZigZag( ImDrawList* draw, const ImVec2& wpos, double start, double end, double h, uint32_t color, float thickness = 1.f )
{
const auto dpos = wpos + ImVec2( 0.5f, 0.5f );
const auto spanSz = end - start;
if( spanSz <= h * 0.5 )
{
DrawLine( draw, wpos + ImVec2( start + 0.5f, 0.5f ), wpos + ImVec2( start + spanSz + 0.5f, round( -spanSz ) + 0.5f ), color, thickness );
DrawLine( draw, dpos + ImVec2( start, 0 ), wpos + ImVec2( start + spanSz, round( -spanSz ) ), color, thickness );
return;
}
const auto p = wpos + ImVec2( 0.5f, 0.5f );
const auto h05 = round( h * 0.5 );
draw->PathLineTo( p + ImVec2( start, 0 ) );
draw->PathLineTo( p + ImVec2( start + h05, -h05 ) );
start += h05;
const auto h2 = h*2;
int steps = int( ( end - start ) / h2 );
auto path = (ImVec2*)alloca( sizeof( ImVec2 ) * ( 2 * steps + 4 ) );
auto ptr = path;
*ptr++ = dpos + ImVec2( start, 0 );
*ptr++ = dpos + ImVec2( start + h05, -h05 );
start += h05;
while( steps-- )
{
draw->PathLineTo( p + ImVec2( start + h, h05 ) );
draw->PathLineTo( p + ImVec2( start + h2, -h05 ) );
*ptr++ = dpos + ImVec2( start + h, h05 );
*ptr++ = dpos + ImVec2( start + h2, -h05 );
start += h2;
}
if( end - start <= h )
{
const auto span = end - start;
draw->PathLineTo( p + ImVec2( start + span, round( span - h*0.5 ) ) );
*ptr++ = dpos + ImVec2( start + span, round( span - h*0.5 ) );
}
else
{
const auto span = end - start - h;
draw->PathLineTo( p + ImVec2( start + h, h05 ) );
draw->PathLineTo( p + ImVec2( start + h + span, round( h*0.5 - span ) ) );
*ptr++ = dpos + ImVec2( start + h, h05 );
*ptr++ = dpos + ImVec2( start + h + span, round( h*0.5 - span ) );
}
draw->PathStroke( color, false, thickness );
draw->AddPolyline( path, ptr - path, color, 0, thickness );
}
static uint32_t GetColorMuted( uint32_t color, bool active )