c++ - Image Magick slow drawing -


i trying draw bunch of lines on image using image magick library (magick++ api) , total execution time appears quite large.

are there ways optimize imagick drawing performance?

int size = 700, lines_num = 6000;  image outputimage(geometry(size, size), color("white"));  (int = 0; < lines_num; i++) {     outputimage.draw(drawableline(lines[i].x1,lines[i].y1,                                   lines[i].x2,lines[i].y2)); }

try avoid repeat magick::image.draw calls.

std::vector<magick::drawable> drawlist; (int = 0; < lines_num; i++) {     drawlist.push_back(drawableline(lines[i].x1,lines[i].y1,                                     lines[i].x2,lines[i].y2)); } outputimage.draw(drawlist);

also ensure imagemagick libraries have been compiled openmp support. if going speed, , not quality, recommend recompiling without high dynamic range imagery --enable-hdri=no, , low quantum depth --with-quantum-depth=8.


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