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DrawList: fixed overdraw of transparent rounded rectangles

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- transition earlier to _AddRectTinyRounding() to avoid overdraw issues
This commit is contained in:
Mikko Mononen
2026-06-04 10:28:18 +03:00
committed by ocornut
parent 7a717a297c
commit 589c83aab9
1 changed files with 3 additions and 2 deletions
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5
imgui_draw.cpp
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@@ -2630,7 +2630,7 @@ void ImDrawList::_AddRectTinyRounding(const ImVec2& p_min, const ImVec2& p_max,
thickness += fringe; thickness += fringe;
rounding += half_fringe; rounding += half_fringe;
const float stem_offset = thickness - (thickness - rounding); const float stem_offset = ImMin(rounding, thickness); // The function might get called with rounding slightly bigger than thickness, which is ok, but we should keep the stem inside the shape.
const float half_texel = 0.5f * _Data->FontAtlas->TexUvScale.x; const float half_texel = 0.5f * _Data->FontAtlas->TexUvScale.x;
const float ratio = stem_offset / thickness; const float ratio = stem_offset / thickness;
ImVec2 inner_uv, outer_uv, stem_uv; ImVec2 inner_uv, outer_uv, stem_uv;
@@ -2835,7 +2835,8 @@ void ImDrawList::AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, fl
} }
else else
{ {
if (thickness > outer_rounding) // Switch to specialized rendering a bit early to avoid overdraw visible in transparent shapes.
if (thickness + (0.75f * _FringeScale) > outer_rounding)
{ {
// Special case rendering to avoid rendering artifacts at the corners. // Special case rendering to avoid rendering artifacts at the corners.
// If rendered using the regular polyline, the stroke will fold and leave artifact on the corner if rendered with transparency. // If rendered using the regular polyline, the stroke will fold and leave artifact on the corner if rendered with transparency.