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DrawList: Optimize AddRectFilled()

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- detect and draw non-rounded non-AA rect with less branches and calculations
- improves new AddRectFilled() overhead from 30% to 5-10%
This commit is contained in:
Mikko Mononen
2026-06-15 21:07:08 +03:00
committed by ocornut
parent 9549b6ff7e
commit c8867c72dc
1 changed files with 15 additions and 6 deletions
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21
imgui_draw.cpp
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@@ -2923,17 +2923,27 @@ void ImDrawList::AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 c
return;
}
if ((flags & ImDrawFlags_RoundCornersMask_) == 0)
flags |= ImDrawFlags_RoundCornersAll;
const bool has_rounding = (flags & ImDrawFlags_RoundCornersMask_) != ImDrawFlags_RoundCornersNone && IM_HAS_ROUNDING(rounding);
const bool is_truncated = IM_IS_TRUNCATED4(p_min.x, p_min.y, p_max.x, p_max.y) && IM_IS_TRUNCATED(rounding);
if (_FringeScaleIsInteger && is_truncated)
{
// Fast path for the non-AA non-rounded rect.
if (!has_rounding)
{
PrimReserve(6, 4);
PrimRect(p_min, p_max, col);
return;
}
if ((flags & ImDrawFlags_RoundCornersMask_) == 0)
flags |= ImDrawFlags_RoundCornersAll;
rounding = ImMin(rounding, ImFabs(width) * (((flags & ImDrawFlags_RoundCornersTop) == ImDrawFlags_RoundCornersTop) || ((flags & ImDrawFlags_RoundCornersBottom) == ImDrawFlags_RoundCornersBottom) ? 0.5f : 1.0f) - 1.0f);
rounding = ImMin(rounding, ImFabs(height) * (((flags & ImDrawFlags_RoundCornersLeft) == ImDrawFlags_RoundCornersLeft) || ((flags & ImDrawFlags_RoundCornersRight) == ImDrawFlags_RoundCornersRight) ? 0.5f : 1.0f) - 1.0f);
const int s_rounding = (int)(rounding * _InvFringeScale);
if (s_rounding <= 0 || (flags & ImDrawFlags_RoundCornersMask_) == ImDrawFlags_RoundCornersNone)
if (s_rounding <= 0)
{
PrimReserve(6, 4);
PrimRect(p_min, p_max, col);
@@ -2953,8 +2963,7 @@ void ImDrawList::AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 c
}
}
const bool has_rounding = (rounding >= _FringeScale * 0.5f);
if (!has_rounding || (flags & ImDrawFlags_RoundCornersMask_) == ImDrawFlags_RoundCornersNone)
if (!has_rounding)
{
const ImVec2 points[4] = { p_min, ImVec2(p_max.x, p_min.y), p_max, ImVec2(p_min.x, p_max.y) };
AddConvexPolyFilled(points, 4, col, ImDrawFlags_MiterOnly);