ref: c630a46750f449cd67ab56e6045f1e0100613362
dir: /draw.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
enum{
Csamp,
Cline,
Cloop,
Ncol,
};
static Image *col[Ncol];
static Image *viewbg, *view;
static Rectangle liner;
static Point statp;
static vlong views, viewe, viewmax, bgofs;
static int bgscalyl, bgscalyr, bgscalf;
static uchar bgbuf[Nchunk * 200];
static void (*drawbg)(void);
static Image *
eallocimage(Rectangle r, int repl, ulong col)
{
Image *i;
if((i = allocimage(display, r, screen->chan, repl, col)) == nil)
sysfatal("allocimage: %r");
return i;
}
static void
drawsamps(void)
{
int x, n, lmin, lmax, rmin, rmax;
s16int s;
uchar *p, *e, *et;
Rectangle l, r;
if(bgofs >= viewe)
return;
n = viewe - bgofs;
if(n > sizeof bgbuf)
n = sizeof bgbuf;
if(n > T)
n -= n % T;
if(!file)
p = pcmbuf + bgofs;
else{
seek(ifd, bgofs, 0);
n = read(ifd, bgbuf, n);
seek(ifd, seekp, 0);
p = bgbuf;
}
e = p + n;
x = (bgofs - views) / T;
while(p < e){
n = T;
if(n > e - p)
n -= n - (e - p);
bgofs += n;
et = p + n;
lmin = lmax = 0;
rmin = rmax = 0;
while(p < et){
s = (s16int)(p[1] << 8 | p[0]);
if(s < lmin)
lmin = s;
else if(s > lmax)
lmax = s;
if(stereo){
s = (s16int)(p[3] << 8 | p[2]);
if(s < rmin)
rmin = s;
else if(s > rmax)
rmax = s;
}
p += 4;
}
l = Rect(x, bgscalyl - lmax / bgscalf,
x+1, bgscalyl - lmin / bgscalf);
r = Rect(x, bgscalyr - rmax / bgscalf,
x+1, bgscalyr - rmin / bgscalf);
draw(viewbg, l, col[Csamp], nil, ZP);
if(stereo)
draw(viewbg, r, col[Csamp], nil, ZP);
x++;
}
}
static void
b2t(uvlong ofs, int *th, int *tm, int *ts, int *tμ)
{
uvlong nsamp;
nsamp = ofs / 4;
*ts = nsamp / 44100;
*tm = *ts / 60;
*th = *tm / 60;
*tμ = 100 * (nsamp - *ts * 44100) / 44100;
*ts %= 60;
}
static void
drawstat(void)
{
int th, tm, ts, tμ;
uvlong ssamp;
char s[256], *p;
ssamp = seekp / 4;
ts = ssamp / 44100;
tm = ts / 60;
th = tm / 60;
tμ = 100 * (ssamp - ts * 44100) / 44100;
ts %= 60;
p = seprint(s, s+sizeof s, "T %lld @ %02d:%02d:%02d.%03d (%llud) ⋅ ",
T/4, th, tm, ts, tμ, ssamp);
if(loops != 0 && loops >= views){
b2t(loops, &th, &tm, &ts, &tμ);
p = seprint(p, s+sizeof s, "%02d:%02d:%02d.%03d (%llud) ↺ ",
th, tm, ts, tμ, loops);
}else
p = seprint(p, s+sizeof s, "0 ↺ ");
if(loope != filesz){
b2t(loope, &th, &tm, &ts, &tμ);
seprint(p, s+sizeof s, "%02d:%02d:%02d.%03d (%llud)",
th, tm, ts, tμ, loope);
}else
seprint(p, s+sizeof s, "∞");
string(screen, statp, col[Cline], ZP, font, s);
}
static void
drawview(void)
{
int x;
Rectangle r;
draw(view, view->r, viewbg, nil, ZP);
if(loops != 0 && loops >= views){
x = (loops - views) / T;
r = view->r;
r.min.x += x;
r.max.x = r.min.x + 1;
draw(view, r, col[Cloop], nil, ZP);
}
if(loope != filesz ){
x = (loope - views) / T;
r = view->r;
r.min.x += x;
r.max.x = r.min.x + 1;
draw(view, r, col[Cloop], nil, ZP);
}
}
void
update(void)
{
int x;
drawbg();
drawview();
x = screen->r.min.x + (seekp - views) / T;
//if(liner.min.x == x || seekp < views && x > liner.min.x)
// return;
draw(screen, screen->r, view, nil, ZP);
liner.min.x = x;
liner.max.x = x + 1;
if(seekp >= views)
draw(screen, liner, col[Cline], nil, ZP);
drawstat();
flushimage(display, 1);
}
void
setzoom(int Δz, int pow)
{
int z;
if(!pow)
z = zoom + Δz;
else if(Δz < 0)
z = zoom >> -Δz;
else
z = zoom << Δz;
if(z < 1 || z > nsamp / Dx(screen->r))
return;
zoom = z;
redraw(0);
}
void
setpan(int Δx)
{
Δx *= T;
if(zoom == 1 || views == 0 && Δx < 0 || views >= viewmax && Δx > 0)
return;
views += Δx;
redraw(0);
}
void
setloop(vlong ofs)
{
ofs *= T;
ofs += views;
if(ofs < 0 || ofs > filesz)
return;
if(ofs < seekp)
loops = ofs;
else
loope = ofs;
update();
}
void
setpos(vlong ofs)
{
if(ofs < loops || ofs > loope - Nchunk)
return;
seekp = ofs;
if(file)
seek(ifd, ofs, 0);
update();
}
void
setofs(vlong ofs)
{
setpos(views + ofs * T);
}
static void
resetdraw(void)
{
int x;
Rectangle viewr, midr;
x = screen->r.min.x + (seekp - views) / T;
viewr = rectsubpt(screen->r, screen->r.min);
freeimage(viewbg);
freeimage(view);
viewbg = eallocimage(viewr, 0, DNofill);
view = eallocimage(viewr, 0, DBlack);
if(stereo){
midr = viewr;
midr.min.y = midr.max.y / 2;
midr.max.y = midr.min.y + 1;
draw(viewbg, midr, col[Csamp], nil, ZP);
statp = Pt(screen->r.min.x,
screen->r.min.y + (Dy(screen->r) - font->height) / 2 + 1);
}else
statp = Pt(screen->r.min.x, screen->r.max.y - font->height);
liner = screen->r;
liner.min.x = x;
liner.max.x = x + 1;
bgscalyl = viewbg->r.max.y / (stereo ? 4 : 2);
bgscalyr = viewbg->r.max.y - bgscalyl;
bgscalf = 32767 / bgscalyl;
}
void
redraw(int all)
{
vlong span;
T = filesz / zoom / Dx(screen->r) & ~3;
if(T == 0)
T = 4;
span = Dx(screen->r) * T;
viewmax = filesz - span;
if(views < 0)
views = 0;
else if(views > viewmax)
views = viewmax;
viewe = views + span;
bgofs = views;
if(all)
resetdraw();
draw(viewbg, viewbg->r, display->black, nil, ZP);
update();
}
void
initdrw(void)
{
if(initdraw(nil, nil, "pplay") < 0)
sysfatal("initdraw: %r");
col[Csamp] = eallocimage(Rect(0,0,1,1), 1, 0x440000FF);
col[Cline] = eallocimage(Rect(0,0,1,1), 1, 0x884400FF);
col[Cloop] = eallocimage(Rect(0,0,1,1), 1, 0x777777FF);
drawbg = drawsamps;
loope = filesz;
redraw(1);
}