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DrawList: Optimize AddNgon()

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- test overestimate before testing more expensive details when testing if stroked ngon is actualy filled
- Note: not a common function, but the test harness is using this to draw a triangle, which makes it show up in profiling
This commit is contained in:
Mikko Mononen
2026-06-15 22:23:38 +03:00
committed by ocornut
parent c8867c72dc
commit b35777c58d
1 changed files with 20 additions and 16 deletions
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36
imgui_draw.cpp
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@@ -3131,23 +3131,27 @@ void ImDrawList::AddNgon(const ImVec2& center, float radius, ImU32 col, int num_
radius = ImMax(0.01f, radius);
const float unit_apothem = ImCos(IM_PI / (float)num_segments);
const float miter_thickness = thickness / unit_apothem;
float outer_radius = radius;
if (stroke_pos == ImDrawFlags_StrokeCenter)
outer_radius = radius + miter_thickness * 0.5f;
else if (stroke_pos == ImDrawFlags_StrokeCenterBiased)
outer_radius = radius + _CalculateCenterBiasedOffset(miter_thickness);
else if (stroke_pos == ImDrawFlags_StrokeInside)
outer_radius = radius;
else if (stroke_pos == ImDrawFlags_StrokeOutside)
outer_radius = radius + miter_thickness;
if (outer_radius < (miter_thickness + _FringeScale)) IM_UNLIKELY
// Check overestimate first before testing details.
if (radius < (thickness * 2.f + 1.f))
{
// The polygon has collapsed into a filled polygon.
AddNgonFilled(center, outer_radius, col, num_segments);
return;
const float unit_apothem = ImCos(IM_PI / (float)num_segments);
const float miter_thickness = thickness / unit_apothem;
float outer_radius = radius;
if (stroke_pos == ImDrawFlags_StrokeCenter)
outer_radius = radius + miter_thickness * 0.5f;
else if (stroke_pos == ImDrawFlags_StrokeCenterBiased)
outer_radius = radius + _CalculateCenterBiasedOffset(miter_thickness);
else if (stroke_pos == ImDrawFlags_StrokeInside)
outer_radius = radius;
else if (stroke_pos == ImDrawFlags_StrokeOutside)
outer_radius = radius + miter_thickness;
if (outer_radius < (miter_thickness + _FringeScale)) IM_UNLIKELY
{
// The polygon has collapsed into a filled polygon.
AddNgonFilled(center, outer_radius, col, num_segments);
return;
}
}
// Because we are filling a closed shape we remove 1 from the count of segments/points