shithub: pplay

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draw: improve panning drawing performance by reducing updates

--- a/draw.c

+++ b/draw.c

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

 static usize T;

 static int sampwidth = 1;

 static double zoom = 1.0;

+int viewdone;

 static Image *

 eallocimage(Rectangle r, int repl, ulong col)

@@ -162,9 +163,10 @@

 				draw(viewbg, r, col[Csamp], nil, ZP);

 			unlockdisplay(display);

 			x = (d.pos - views) / T;

-			if(x % 100 == 0)

+			if(x % 320 == 0)

 				update();

 		}

+		viewdone = 1;

 		update();

 		qunlock(&lsync);

 	}

@@ -205,6 +207,8 @@

 	int x;

 	usize p;

+	if(!viewdone)

+		return;

 	p = dot.pos;

 	lockdisplay(display);

 	drawview();

@@ -360,7 +364,7 @@

 		resetdraw();

 	unlockdisplay(display);

 	nbsendul(drawc, 1);

-	update();

+	viewdone = 0;

 }

 void

--- a/pplay.c

+++ b/pplay.c

@@ -40,7 +40,8 @@

 		}

 		nerr = 0;

 		advance(&dot, n);

-		update();

+		if(viewdone)

+			update();

 		yield();

 	}

 }