diff options
Diffstat (limited to 'src/libdraw/ml-lalloc.c')
-rw-r--r-- | src/libdraw/ml-lalloc.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/libdraw/ml-lalloc.c b/src/libdraw/ml-lalloc.c new file mode 100644 index 00000000..17d934d3 --- /dev/null +++ b/src/libdraw/ml-lalloc.c @@ -0,0 +1,79 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> +#include <memdraw.h> +#include <memlayer.h> + +Memimage* +memlalloc(Memscreen *s, Rectangle screenr, Refreshfn refreshfn, void *refreshptr, u32int val) +{ + Memlayer *l; + Memimage *n; + static Memimage *paint; + + if(paint == nil){ + paint = allocmemimage(Rect(0,0,1,1), RGBA32); + if(paint == nil) + return nil; + paint->flags |= Frepl; + paint->clipr = Rect(-0x3FFFFFF, -0x3FFFFFF, 0x3FFFFFF, 0x3FFFFFF); + } + + n = allocmemimaged(screenr, s->image->chan, s->image->data, nil); + if(n == nil) + return nil; + l = malloc(sizeof(Memlayer)); + if(l == nil){ + free(n); + return nil; + } + + l->screen = s; + if(refreshfn) + l->save = nil; + else{ + l->save = allocmemimage(screenr, s->image->chan); + if(l->save == nil){ + free(l); + free(n); + return nil; + } + /* allocmemimage doesn't initialize memory; this paints save area */ + if(val != DNofill) + memfillcolor(l->save, val); + } + l->refreshfn = refreshfn; + l->refreshptr = nil; /* don't set it until we're done */ + l->screenr = screenr; + l->delta = Pt(0,0); + + n->data->ref++; + n->zero = s->image->zero; + n->width = s->image->width; + n->layer = l; + + /* start with new window behind all existing ones */ + l->front = s->rearmost; + l->rear = nil; + if(s->rearmost) + s->rearmost->layer->rear = n; + s->rearmost = n; + if(s->frontmost == nil) + s->frontmost = n; + l->clear = 0; + + /* now pull new window to front */ + _memltofrontfill(n, val != DNofill); + l->refreshptr = refreshptr; + + /* + * paint with requested color; previously exposed areas are already right + * if this window has backing store, but just painting the whole thing is simplest. + */ + if(val != DNofill){ + memsetchan(paint, n->chan); + memfillcolor(paint, val); + memdraw(n, n->r, paint, n->r.min, nil, n->r.min, S); + } + return n; +} |