ref: b7af62b250e5dff30320a181ca9d53ab5a7c276d
dir: /libdraw/bytesperline.c/
#include "lib9.h" #include "draw.h" static int unitsperline(Rectangle r, int d, int bitsperunit) { ulong l, t; if(r.min.x >= 0){ l = (r.max.x*d+bitsperunit-1)/bitsperunit; l -= (r.min.x*d)/bitsperunit; }else{ /* make positive before divide */ t = (-r.min.x*d+bitsperunit-1)/bitsperunit; l = t+(r.max.x*d+bitsperunit-1)/bitsperunit; } return l; } int wordsperline(Rectangle r, int d) { return unitsperline(r, d, 8*sizeof(ulong)); } int bytesperline(Rectangle r, int d) { return unitsperline(r, d, 8); }