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mothra: limit amount of image data kept in devdraw to 8MB

--- a/sys/src/cmd/mothra/getpix.c

+++ b/sys/src/cmd/mothra/getpix.c

@@ -21,12 +21,6 @@

 [BMP]	"bmp -9t",

 };

-void storebitmap(Rtext *t, Image *b){

-	t->b=b;

-	free(t->text);

-	t->text=0;

-}

-

 void getimage(Rtext *t, Www *w){

 	int pfd[2];

 	Action *ap;

@@ -40,7 +34,7 @@

 	seturl(&url, ap->image, w->url->fullname);

 	for(p=w->pix;p!=nil; p=p->next)

 		if(strcmp(ap->image, p->name)==0 && ap->width==p->width && ap->height==p->height){

-			storebitmap(t, p->b);

+			t->b = p->b;

 			w->changed=1;

 			return;

 		}

@@ -87,7 +81,7 @@

 	p->height=ap->height;

 	p->next=w->pix;

 	w->pix=p;

-	storebitmap(t, b);

+	t->b=b;

 	w->changed=1;

 }

@@ -144,8 +138,15 @@

 	}

 }

-void freepix(void *p)

-{

+ulong countpix(void *p){

+	ulong n=0;

+	Pix *x;

+	for(x = p; x; x = x->next)

+		n += Dy(x->b->r)*bytesperline(x->b->r, x->b->depth);

+	return n;

+}

+

+void freepix(void *p){

 	Pix *x, *xx;

 	xx = p;

 	while(x = xx){

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -961,9 +961,10 @@

  * get the file at the given url

  */

 void geturl(char *urlname, int method, char *body, int plumb, int map){

-	int i, fd, typ;

+	int i, fd, typ, pfd[2];

 	char cmd[NNAME];

-	int pfd[2];

+	Rtext *t;

+	ulong n;

 	Www *w;

 	if(*urlname == '#'){

@@ -1013,11 +1014,22 @@

 		case HTML:

 			fd = pipeline("/bin/uhtml", fd);

 		case PLAIN:

+			n=0; 

+			for(i=wwwtop-1; i>=0 && i!=(wwwtop-NWWW-1); i--){

+				w = www(i);

+				n += countpix(w->pix);

+				if(n < NPIXMB*1024*1024)

+					continue;

+				if(!w->finished && !w->alldone)

+					continue;

+				for(t=w->text; t; t=t->next)

+					if(t->b && t->user)

+						t->b=0;

+				freepix(w->pix);

+				w->pix=0;

+			}

 			w = www(i = wwwtop++);

 			if(i >= NWWW){

-				extern void freeform(void *p);

-				extern void freepix(void *p);

-

 				/* wait for the reader to finish the document */

 				while(!w->finished && !w->alldone){

 					unlockdisplay(display);

@@ -1024,7 +1036,6 @@

 					sleep(10);

 					lockdisplay(display);

 				}

-

 				freetext(w->text);

 				freeform(w->form);

 				freepix(w->pix);

--- a/sys/src/cmd/mothra/mothra.h

+++ b/sys/src/cmd/mothra/mothra.h

@@ -1,6 +1,7 @@

 enum{

 	NWWW=64,	/* # of pages we hold in the log */

 	NXPROC=5,	/* # of parallel procs loading the pix */

+	NPIXMB=8,	/* megabytes of image data to keep arround */

 	NNAME=512,

 	NLINE=256,

 	NAUTH=128,

@@ -82,12 +83,14 @@

 void htmlerror(char *, int, char *, ...);	/* user-supplied routine */

 void seturl(Url *, char *, char *);

 void getpix(Rtext *, Www *);

+ulong countpix(void *p);

+void freepix(void *p);

 int pipeline(char *, int);

 int urlopen(Url *, int, char *);

 void getfonts(void);

 void *emalloc(int);

 void *emallocz(int, int);

-void setbitmap(Rtext *);

+void freeform(void *p);

 void message(char *, ...);

 int snooptype(int fd);

 void mkfieldpanel(Rtext *);