From a0d146edd7a7de6236a0d60baafeeb59f8452aae Mon Sep 17 00:00:00 2001
From: rsc <devnull@localhost>
Date: Tue, 12 Jul 2005 15:23:36 +0000
Subject: return of venti

---
 src/cmd/venti/srv/graph.c | 202 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 src/cmd/venti/srv/graph.c

(limited to 'src/cmd/venti/srv/graph.c')

diff --git a/src/cmd/venti/srv/graph.c b/src/cmd/venti/srv/graph.c
new file mode 100644
index 00000000..157b82db
--- /dev/null
+++ b/src/cmd/venti/srv/graph.c
@@ -0,0 +1,202 @@
+#include "stdinc.h"
+#include "dat.h"
+#include "fns.h"
+
+enum
+{
+	Top = 1,
+	Bottom = 1,
+	Left = 40,
+	Right = 0,
+	MinWidth = Left+Right+2,
+	MinHeight = Top+Bottom+2,
+	DefaultWidth = Left+Right+500,
+	DefaultHeight = Top+Bottom+40
+};
+
+QLock memdrawlock;
+static Memsubfont *smallfont;
+static Memimage *black;
+static Memimage *blue;
+static Memimage *red;
+static Memimage *lofill[6];
+static Memimage *hifill[6];
+static Memimage *grid;
+
+static ulong fill[] = {
+	0xFFAAAAFF,	0xBB5D5DFF,	/* peach */
+	DPalegreygreen, DPurpleblue,	/* aqua */
+	DDarkyellow, DYellowgreen,	/* yellow */
+	DMedgreen, DDarkgreen,		/* green */
+	0x00AAFFFF, 0x0088CCFF,	/* blue */
+	0xCCCCCCFF, 0x888888FF,	/* grey */
+};
+
+Memimage*
+allocrepl(ulong color)
+{
+	Memimage *m;
+	
+	m = allocmemimage(Rect(0,0,1,1), RGB24);
+	memfillcolor(m, color);
+	m->flags |= Frepl;
+	m->clipr = Rect(-1000000, -1000000, 1000000, 1000000);
+	return m;
+}
+
+static void
+ginit(void)
+{
+	static int first = 1;
+	int i;
+	
+	if(!first)
+		return;
+		
+	first = 0;
+	memimageinit();
+	smallfont = openmemsubfont(unsharp("#9/font/lucidasans/lstr.10"));
+	black = memblack;
+	blue = allocrepl(DBlue);
+	red = allocrepl(DRed);
+	grid = allocrepl(0x77777777);
+	for(i=0; i<nelem(fill)/2 && i<nelem(lofill) && i<nelem(hifill); i++){
+		lofill[i] = allocrepl(fill[2*i]);
+		hifill[i] = allocrepl(fill[2*i+1]);
+	}
+}
+
+static void
+mklabel(char *str, int v)
+{
+	if(v < 0){
+		v = -v;
+		*str++ = '-';
+	}
+	if(v < 10000)
+		sprint(str, "%d", v);
+	else if(v < 10000000)
+		sprint(str, "%dk", v/1000);
+	else
+		sprint(str, "%dM", v/1000000);
+}
+
+static void
+drawlabel(Memimage *m, Point p, int n)
+{
+	char buf[30];
+	Point w;
+	
+	mklabel(buf, n);
+	w = memsubfontwidth(smallfont, buf);
+	memimagestring(m, Pt(p.x-5-w.x, p.y), memblack, ZP, smallfont, buf);
+}
+
+static int
+scalept(int val, int valmin, int valmax, int ptmin, int ptmax)
+{
+	if(val <= valmin)
+		val = valmin;
+	if(val >= valmax)
+		val = valmax;
+	if(valmax == valmin)
+		valmax++;
+	return ptmin + (vlong)(val-valmin)*(ptmax-ptmin)/(valmax-valmin);
+}
+
+Memimage*
+statgraph(Graph *g)
+{
+	int i, lastlo, nbin, x, lo, hi, min, max, first;
+	Memimage *m;
+	Rectangle r;
+	Statbin *b, bin[2000];	/* 32 kB, but whack is worse */
+
+	needstack(8192);	/* double check that bin didn't kill us */
+	
+	if(g->wid <= MinWidth)
+		g->wid = DefaultWidth;
+	if(g->ht <= MinHeight)
+		g->ht = DefaultHeight;
+	if(g->wid > nelem(bin))
+		g->wid = nelem(bin);
+	if(g->fill < 0)
+		g->fill = ((uint)g->arg>>8)%nelem(lofill);
+	if(g->fill > nelem(lofill))
+		g->fill %= nelem(lofill);
+	
+	nbin = g->wid - (Left+Right);
+	binstats(g->fn, g->arg, g->t0, g->t1, bin, nbin);
+
+	/*
+	 * compute bounds
+	 */
+	min = g->min;
+	max = g->max;
+	if(min < 0 || max <= min){
+		min = max = 0;
+		first = 1;
+		for(i=0; i<nbin; i++){
+			b = &bin[i];
+			if(b->nsamp == 0)
+				continue;
+			if(first || b->min < min)
+				min = b->min;
+			if(first || b->max > max)
+				max = b->max;
+			first = 0;
+		}
+	}
+
+	qlock(&memdrawlock);
+	ginit();
+	if(smallfont==nil || black==nil || blue==nil || red==nil || hifill==nil || lofill==nil){
+		werrstr("graphics initialization failed");
+		qunlock(&memdrawlock);
+		return nil;
+	}
+
+	/* fresh image */
+	m = allocmemimage(Rect(0,0,g->wid,g->ht), ABGR32);
+	if(m == nil){
+		qunlock(&memdrawlock);
+		return nil;
+	}
+	r = Rect(Left, Top, g->wid-Right, g->ht-Bottom);
+	memfillcolor(m, DTransparent);
+	
+	/* x axis */
+	memimagedraw(m, Rect(r.min.x, r.max.y, r.max.x, r.max.y+1), black, ZP, memopaque, ZP, S);
+
+	/* y labels */
+	drawlabel(m, r.min, max);
+	if(min != 0)
+		drawlabel(m, Pt(r.min.x, r.max.y-smallfont->height), min);
+	
+	/* actual data */
+	lastlo = -1;
+	for(i=0; i<nbin; i++){
+		b = &bin[i];
+		if(b->nsamp == 0)
+			continue;
+		lo = scalept(b->min, min, max, r.max.y, r.min.y);
+		hi = scalept(b->max, min, max, r.max.y, r.min.y);
+		x = r.min.x+i;
+		hi-=2;
+		if(0)
+		if(lastlo != -1){
+			if(lastlo < lo)
+				memimagedraw(m, Rect(x-1, lastlo, x, lo), hifill[g->fill], ZP, memopaque, ZP, S);
+			else if(lastlo > lo)
+				memimagedraw(m, Rect(x-1, lo, x, lastlo), hifill[g->fill], ZP, memopaque, ZP, S);
+		}
+		memimagedraw(m, Rect(x, hi, x+1,lo), hifill[g->fill], ZP, memopaque, ZP, S);
+		memimagedraw(m, Rect(x, lo, x+1, r.max.y), lofill[g->fill], ZP, memopaque, ZP, S);
+		lastlo = lo;
+	}
+
+	if(bin[nbin-1].nsamp)
+		drawlabel(m, Pt(r.max.x, r.min.y+(Dy(r)-smallfont->height)/2), bin[nbin-1].avg);
+	qunlock(&memdrawlock);
+	return m;
+}
-- 
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