ref: a8ad3fb3d00551bad97e7b10a9666821fe4b601a
dir: /sys/src/libmemlayer/load.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <memdraw.h> #include <memlayer.h> int memload(Memimage *dst, Rectangle r, uchar *data, int n, int iscompressed) { int (*loadfn)(Memimage*, Rectangle, uchar*, int); Memimage *tmp; Memlayer *dl; Rectangle lr; int dx; loadfn = loadmemimage; if(iscompressed) loadfn = cloadmemimage; Top: dl = dst->layer; if(dl == nil) return loadfn(dst, r, data, n); /* * Convert to screen coordinates. */ lr = r; r.min.x += dl->delta.x; r.min.y += dl->delta.y; r.max.x += dl->delta.x; r.max.y += dl->delta.y; dx = dl->delta.x&(7/dst->depth); if(dl->clear && dx==0){ dst = dl->screen->image; goto Top; } /* * dst is an obscured layer or data is unaligned */ if(dl->save && dx==0){ n = loadfn(dl->save, lr, data, n); if(n > 0) memlexpose(dst, r); return n; } tmp = allocmemimage(lr, dst->chan); if(tmp == nil) return -1; n = loadfn(tmp, lr, data, n); memdraw(dst, lr, tmp, lr.min, nil, lr.min, S); freememimage(tmp); return n; }