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Tweak CalcTextSize() awkward width rounding/ceiling code to reduce floating-point imprecisions altering the result by 1 even at relatively small width. (#791) + apply same fudge factor to less important roundings.

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ceilf() is still measurable e.g. ballpark +0.5 for 200k calls.
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ocornut
2026-05-28 19:19:11 +02:00
parent 33bb693b4c
commit 12b7977555
4 changed files with 10 additions and 9 deletions
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imgui_draw.cpp
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@@ -656,7 +656,7 @@ void ImDrawList::_OnChangedVtxOffset()
int ImDrawList::_CalcCircleAutoSegmentCount(float radius) const
{
// Automatic segment count
const int radius_idx = (int)(radius + 0.999999f); // ceil to never reduce accuracy
const int radius_idx = (int)(radius + 0.999f); // ceil to never reduce accuracy
if (radius_idx >= 0 && radius_idx < IM_COUNTOF(_Data->CircleSegmentCounts))
return _Data->CircleSegmentCounts[radius_idx]; // Use cached value
else