ref: fc4bfd57d261e5c99c5d4367adf5c72e8c7e6496
dir: /sys/src/cmd/jpg/multichan.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <bio.h> #include "imagefile.h" /* Separate colors, if not a grey scale or bitmap, into one byte per color per pixel, no alpha or X */ /* Result is GREY[1248] or RGB24 */ static int notrans(ulong chan) { switch(chan){ case GREY1: case GREY2: case GREY4: case GREY8: case RGB24: return 1; } return 0; } Image* multichan(Image *i) { Image *ni; if(notrans(i->chan)) return i; ni = allocimage(display, i->r, RGB24, 0, DNofill); if(ni == nil) return ni; draw(ni, ni->r, i, nil, i->r.min); return ni; } Memimage* memmultichan(Memimage *i) { Memimage *ni; if(notrans(i->chan)) return i; ni = allocmemimage(i->r, RGB24); if(ni == nil) return ni; memimagedraw(ni, ni->r, i, i->r.min, nil, i->r.min, S); return ni; }