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optimize: replace push_back with emplace_back in core loops

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Replaces wasteful temporary object construction with in-place construction using emplace_back. Covers hot paths in objdetect, imgproc, and stitching modules.
This commit is contained in:
AdwaithBatchu
2025-12-19 11:56:20 +05:30
parent b157553e55
commit 5f0bd387db
5 changed files with 50 additions and 50 deletions
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modules/imgproc/src/hough.cpp
+9 -9
View File
@@ -1024,7 +1024,7 @@ void HoughLinesPointSet( InputArray _point, OutputArray _lines, int lines_max, i
int r = idx - (n+1)*(numrho+2) - 1;
line.rho = static_cast<float>(min_rho) + r * (float)rho_step;
line.angle = static_cast<float>(min_theta) + n * (float)theta_step;
lines.push_back(Vec3d((double)accum[idx], (double)line.rho, (double)line.angle));
lines.emplace_back((double)accum[idx], (double)line.rho, (double)line.angle);
}
Mat(lines).copyTo(_lines);
@@ -1125,7 +1125,7 @@ public:
{
if (ptr[x])
{
list.push_back(Point(x, y));
list.emplace_back(x, y);
}
}
}
@@ -1489,7 +1489,7 @@ protected:
// Check if the circle has enough support
if(maxCount > accThreshold)
{
circlesLocal.push_back(EstimatedCircle(Vec3f(curCenter.x, curCenter.y, rBest), maxCount));
circlesLocal.emplace_back(Vec3f(curCenter.x, curCenter.y, rBest), maxCount);
}
}
@@ -1847,7 +1847,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
continue;
mdata[y*mstep + x] = (uchar)1;
stack.push_back(Point(x, y));
stack.emplace_back(x, y);
bool backtrace_mode = false;
do
@@ -1858,7 +1858,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
int vy = dyData[p.y*dxystep + p.x];
float mag = std::sqrt((float)vx*vx+(float)vy*vy);
nz.push_back(Vec4f((float)p.x, (float)p.y, (float)vx, (float)vy));
nz.emplace_back((float)p.x, (float)p.y, (float)vx, (float)vy);
CV_Assert(mdata[p.y*mstep + p.x] == 1);
int sx = cvRound(vx * RAY_FP_SCALE / mag);
@@ -1903,7 +1903,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
if( mdata[y_*mstep + x_] || !edgeData[y_*estep + x_])
continue;
mdata[y_*mstep + x_] = (uchar)1;
stack.push_back(Point(x_, y_));
stack.emplace_back(x_, y_);
neighbors++;
}
@@ -1919,7 +1919,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
// insert a special "stop marker" in the end of each
// connected component to make sure we
// finalize and analyze the arc segment
nz.push_back(Vec4f(0.f, 0.f, 0.f, 0.f));
nz.emplace_back(0.f, 0.f, 0.f, 0.f);
}
}
@@ -1951,7 +1951,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
{
float cx = (float)((left + x - 1)*dp*0.5f);
float cy = (float)(y*dp);
centers.push_back(Point2f(cx, cy));
centers.emplace_back(cx, cy);
left = -1;
}
}
@@ -2223,7 +2223,7 @@ static void HoughCirclesAlt( const Mat& img, std::vector<EstimatedCircle>& circl
// (accepted ? '+' : '-'), cx, cy, rk, cjk.weight, count, max_runlen, cjk.mask);
if( accepted )
local_circles.push_back(EstimatedCircle(Vec3f(cx, cy, (float)rk), cjk.weight));
local_circles.emplace_back(Vec3f(cx, cy, (float)rk), cjk.weight);
}
}
}
modules/imgproc/src/subdivision2d.cpp
+7 -7
View File
@@ -265,7 +265,7 @@ int Subdiv2D::newPoint(Point2f pt, bool isvirtual, int firstEdge)
{
if( freePoint == 0 )
{
vtx.push_back(Vertex());
vtx.emplace_back();
freePoint = (int)(vtx.size()-1);
}
int vidx = freePoint;
@@ -520,8 +520,8 @@ void Subdiv2D::initDelaunay( Rect rect )
Point2f ppB( rx, ry + big_coord );
Point2f ppC( rx - big_coord, ry - big_coord );
vtx.push_back(Vertex());
qedges.push_back(QuadEdge());
vtx.emplace_back();
qedges.emplace_back();
freeQEdge = 0;
freePoint = 0;
@@ -566,8 +566,8 @@ void Subdiv2D::initDelaunay( Rect2f rect )
Point2f ppB( rx, ry + big_coord );
Point2f ppC( rx - big_coord, ry - big_coord );
vtx.push_back(Vertex());
qedges.push_back(QuadEdge());
vtx.emplace_back();
qedges.emplace_back();
freeQEdge = 0;
freePoint = 0;
@@ -784,7 +784,7 @@ void Subdiv2D::getEdgeList(std::vector<Vec4f>& edgeList) const
{
Point2f org = vtx[qedges[i].pt[0]].pt;
Point2f dst = vtx[qedges[i].pt[2]].pt;
edgeList.push_back(Vec4f(org.x, org.y, dst.x, dst.y));
edgeList.emplace_back(org.x, org.y, dst.x, dst.y);
}
}
}
@@ -836,7 +836,7 @@ void Subdiv2D::getTriangleList(std::vector<Vec6f>& triangleList) const
edgemask[edge_a] = true;
edgemask[edge_b] = true;
edgemask[edge_c] = true;
triangleList.push_back(Vec6f(a.x, a.y, b.x, b.y, c.x, c.y));
triangleList.emplace_back(a.x, a.y, b.x, b.y, c.x, c.y);
}
}