shithub: pplay

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add zooming into a range

--- a/dat.h

+++ b/dat.h

@@ -28,7 +28,6 @@

 extern usize totalsz;

 extern int stereo;

-extern int zoom;

 extern int debug;

 #define MIN(x,y)	((x) < (y) ? (x) : (y))

--- a/draw.c

+++ b/draw.c

@@ -26,6 +26,7 @@

 static uchar *sbuf;

 static usize sbufsz;

 static int sampwidth = 1;

+static double zoom = 1.0;

 static Image *

 eallocimage(Rectangle r, int repl, ulong col)

@@ -220,22 +221,46 @@

 }

 void

-setzoom(int Δz, int pow)

+setzoom(int Δz, int mul)

 {

-	int z;

+	double z;

-	if(!pow)

+	if(!mul)

 		z = zoom + Δz;

 	else if(Δz < 0)

-		z = zoom >> -Δz;

+		z = zoom / pow(2, -Δz);

 	else

-		z = zoom << Δz;

-	if(z < 1 || z > (totalsz / 4) / Dx(screen->r))

+		z = zoom * pow(2, Δz);

+	if(z < 1.0 || z > (totalsz / Sampsz) / Dx(screen->r))

 		return;

 	zoom = z;

 	redraw(0);

 }

+int

+zoominto(vlong from, vlong to)

+{

+	if(dot.from.pos == 0 && dot.to.pos == totalsz){

+		fprint(2, "not a range\n");

+		return -1;

+	}

+	if(from < 0)

+		from = 0;

+	from &= ~3;

+	if(to >= totalsz)

+		to = totalsz;

+	to &= ~3;

+	if((to - from) / Sampsz < Dx(screen->r)){

+		werrstr("range too small");

+		return -1;

+	}

+	views = from;

+	viewe = to;

+	zoom = (double)totalsz / (to - from);

+	redraw(0);

+	return 0;

+}

+

 void

 setpan(int Δx)

 {

@@ -326,7 +351,7 @@

 	usize span;

 	lockdisplay(display);

-	T = totalsz / zoom / Dx(screen->r) & ~3;

+	T = (vlong)(totalsz / zoom / Dx(screen->r)) & ~3;

 	if(T == 0)

 		T = 4;

 	span = Dx(screen->r) * T;

--- a/fns.h

+++ b/fns.h

@@ -2,6 +2,7 @@

 void	initcmd(void);

 void	update(void);

 void	setzoom(int, int);

+int	zoominto(vlong, vlong);

 void	setpan(int);

 void	setloop(vlong);

 void	setofs(usize);

--- a/pplay.c

+++ b/pplay.c

@@ -9,7 +9,7 @@

 extern QLock lsync;

-int stereo, zoom = 1;

+int stereo;

 int debug;

 static Keyboardctl *kc;

@@ -140,12 +140,13 @@

 			break;

 		case 2:

 			switch(r){

+			case Kdel:

+			case 'q': threadexitsall(nil);

 			case ' ': toggleplay(); break;

 			case 'b': setjump(dot.from.pos); break;

 			case Kesc: setrange(0, totalsz); update(); break;

-			case Kdel:

-			case 'q': threadexitsall(nil);

-			case 'z': setzoom(-zoom + 1, 0); break;

+			case '\n': zoominto(dot.from.pos, dot.to.pos); break;

+			case 'z': zoominto(0, totalsz); break;

 			case '-': setzoom(-1, 0); break;

 			case '=': setzoom(1, 0); break;

 			case '_': setzoom(-1, 1); break;