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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <geometry.h>
#include "dat.h"
#include "fns.h"
Canvas*
newcanvas(char *name, Point2 p, Rectangle r, ulong chan)
{
Canvas *c;
c = emalloc(sizeof(Canvas));
c->p = p;
c->bx = Vec2(1,0);
c->by = Vec2(0,1);
c->name = strdup(name);
c->image = eallocimage(display, r, chan, 0, alphachan(chan)? DTransparent: DWhite);
memset(&c->layers, 0, sizeof(Layer));
c->layers.next = &c->layers;
c->layers.prev = &c->layers;
c->curlayer = nil;
return c;
}
void
rmcanvas(Canvas *c)
{
Layer *l;
for(l = c->layers.next; l != &c->layers; l = l->next)
rmlayer(l);
freeimage(c->image);
free(c->name);
free(c);
}
Layer*
addlayer(Canvas *c, char *name)
{
Layer *l;
l = newlayer(name, c->image->r, c->image->chan);
l->prev = c->layers.prev;
l->next = &c->layers;
c->layers.prev->next = l;
c->layers.prev = l;
if(c->curlayer == nil)
c->curlayer = l;
return l;
}
Layer*
getlayer(Canvas *c, char *name)
{
Layer *l;
for(l = c->layers.next; l != &c->layers; l = l->next)
if(strcmp(l->name, name) == 0)
return l;
return nil;
}
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