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DrawList: optimized AA end overhead in debug builds.

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- inline some code and reuse vars (ctors get function calls in debug msvc) to reduce the AA line end over in debug builds
This commit is contained in:
Mikko Mononen
2026-08-05 21:24:51 +02:00
committed by ocornut
parent 2b0e9043dc
commit d8afe4b81a
1 changed files with 36 additions and 17 deletions
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imgui_draw.cpp
+36 -17
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@@ -895,6 +895,20 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
idx_count = (/*body*/(points_count - 2) * max_tris_per_point + /*last seg*/4 + /*caps*/(4 * 2)) * 3;
}
const float half_texel = 0.5f * _Data->FontAtlas->TexUvScale.x;
const float ratio = thickness0 / (thickness0 + thickness1); // The points using uv2 are placed on the path, calculate the position from stroke offets.
ImVec2 uv0, uv1, uv2;
uv0.x = tex_uvs.x + half_texel;
uv0.y = tex_uvs.y;
uv1.x = tex_uvs.z - half_texel;
uv1.y = tex_uvs.y;
uv2.x = uv0.x + (uv1.x - uv0.x) * ratio;
uv2.y = tex_uvs.y;
const float half_aa = _FringeScale * 0.5f; // Used for end caps, does not use "fringe" since end cap AA is not using the texture.
const float half_thickness = thickness * 0.5f;
PrimReserve(idx_count, vtx_count);
ImDrawVert* start_vtx_ptr = _VtxWritePtr;
@@ -902,19 +916,11 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
int base_idx = (int)_VtxCurrentIdx;
ImVec2 pa, pb, dir;
ImVec2 p1;
ImVec2 n1;
float len_sqr1;
const float half_texel = 0.5f * _Data->FontAtlas->TexUvScale.x;
const ImVec2 uv0(tex_uvs.x + half_texel, tex_uvs.y);
const ImVec2 uv1(tex_uvs.z - half_texel, tex_uvs.y);
const float ratio = thickness0 / (thickness0 + thickness1); // The points using uv2 are placed on the path, calculate the position from stroke offets.
const ImVec2 uv2(uv0.x + (uv1.x - uv0.x) * ratio, tex_uvs.y);
const float half_aa = _FringeScale * 0.5f; // Used for end caps, does not use "fringe" since end cap AA is not using the texture.
const float half_thickness = thickness * 0.5f;
int point_idx = 0;
int point_end = points_count;
if (!closed)
@@ -926,9 +932,14 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
n1 = normals[0];
len_sqr1 = sqr_lengths[0];
const ImVec2 dir(n1.y, -n1.x);
dir.x = n1.y;
dir.y = -n1.x;
if (flags & ImDrawFlags_SquareCap)
p1 -= dir * half_thickness;
{
p1.x -= dir.x * half_thickness;
p1.y -= dir.y * half_thickness;
}
if (flags & ImDrawFlags_NoAAEnds)
{
@@ -938,8 +949,10 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
}
else
{
const ImVec2 pa = p1 - dir * half_aa;
const ImVec2 pb = p1 + dir * half_aa;
pa.x = p1.x - dir.x * half_aa;
pa.y = p1.y - dir.y * half_aa;
pb.x = p1.x + dir.x * half_aa;
pb.y = p1.y + dir.y * half_aa;
base_idx = (int)_VtxCurrentIdx;
IM_APPEND_VTX(pa.x - n1.x * thickness0, pa.y - n1.y * thickness0, uv0, col_trans);
@@ -1108,9 +1121,13 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
n1 = normals[points_count-1];
// End cap
const ImVec2 dir(n1.y, -n1.x);
dir.x = n1.y;
dir.y = -n1.x;
if (flags & ImDrawFlags_SquareCap)
p1 += dir * half_thickness;
{
p1.x += dir.x * half_thickness;
p1.y += dir.y * half_thickness;
}
if (flags & ImDrawFlags_NoAAEnds)
{
@@ -1123,8 +1140,10 @@ void ImDrawList::_AddPolyline(const ImVec2* points, ImVec2* normals, float* sqr_
}
else
{
const ImVec2 pa = p1 - dir * half_aa;
const ImVec2 pb = p1 + dir * half_aa;
pa.x = p1.x - dir.x * half_aa;
pa.y = p1.y - dir.y * half_aa;
pb.x = p1.x + dir.x * half_aa;
pb.y = p1.y + dir.y * half_aa;
int next_base_idx = (int)_VtxCurrentIdx;
IM_APPEND_VTX(pa.x - n1.x * thickness0, pa.y - n1.y * thickness0, uv0, col);