shithub: sce

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vspr: allow reusing a single shadow frame

--- a/utils/vspr.c

+++ b/utils/vspr.c

@@ -19,7 +19,7 @@

 QLock pauselck;

 int Δt = 1000;

 Point pan, center, shadofs;

-int frm, nfrm, rot, nrot, nspr, cansz;

+int frm, nfrm, nshfrm, rot, nrot, nspr, cansz;

 char *name;

 Image *canvas, *gridcol, *selcol, *bgcol, **imtab, **shtab;

@@ -51,7 +51,7 @@

 	ui = imtab[nrot * frm + rot];

 	us = nil;

 	if(shtab != nil){

-		us = shtab[nrot * frm + rot];

+		us = shtab[nrot * (nshfrm != 1 ? frm : 0) + rot];

 		draw(canvas, rectaddpt(us->r, addpt(o, shadofs)), us, us, us->r.min);

 	}

 	r = ui->r;

@@ -87,8 +87,10 @@

 	if((path = smprint("/sys/games/lib/sce/%s.%s.%02ud%s.bit", name, frm, rot, shad?".s":"")) == nil)

 		sysfatal("mprint: %r");

-	if((fd = open(path, OREAD)) < 0)

-		sysfatal("open: %r");

+	if((fd = open(path, OREAD)) < 0){

+		fprint(2, "open: %r\n");

+		return nil;

+	}

 	if((i = readimage(display, fd, 0)) == nil)

 		sysfatal("readimage: %r");

 	close(fd);

@@ -164,9 +166,10 @@

 	name = *argv++;

 	argc--;

 	nfrm = argc;

+	nshfrm = nfrm;

 	if((imtab = malloc(nfrm * nrot * sizeof *imtab)) == nil)

 		sysfatal("malloc: %r");

-	if(shad && (shtab = malloc(nfrm * nrot * sizeof *shtab)) == nil)

+	if(shad && (shtab = malloc(nshfrm * nrot * sizeof *shtab)) == nil)

 		sysfatal("malloc: %r");

 	i = imtab;

 	s = shtab;

@@ -173,12 +176,20 @@

 	while(*argv != nil){

 		for(n=0; n<nrot; n++){

 			nr = nrot == Nrot ? rot17[n] : n;

-			*i++ = loadframe(*argv, nr, 0);

-			if(shad)

-				*s++ = loadframe(*argv, nr, 1);

+			if((*i++ = loadframe(*argv, nr, 0)) == nil)

+				sysfatal("missing frame");

+			if(shad){

+				if((*s++ = loadframe(*argv, nr, 1)) == nil){

+					if(s - shtab == 1 || n != 0)

+						sysfatal("missing frame");

+					nshfrm = 1;

+				}

+			}

 		}

 		argv++;

 	}

+	if(nshfrm == 1 && nfrm > 1)

+		fprint(2, "only one shadow frame will be used\n");

 	fmtinstall('P', Pfmt);

 	fmtinstall('R', Rfmt);

 	resetdraw();