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authorrodri <rgl@antares-labs.eu>2020-06-18 11:15:15 +0000
committerrodri <rgl@antares-labs.eu>2020-06-18 11:15:15 +0000
commit26c7bae49165a78f3e58e0dd45244c8942a1fe22 (patch)
treea1d042638297b83c4fb846906e38f5a8b1014c36
parent6644b94ee7945f8a55238196e702f0c82f4a93c8 (diff)
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avoid zero zooming. import differential and zoom drawing from paint(1). make new layers transparent by default. minor fixes.
-rw-r--r--canvas.c2
-rw-r--r--dat.h1
-rw-r--r--main.c150
3 files changed, 142 insertions, 11 deletions
diff --git a/canvas.c b/canvas.c
index d8077a0..ab54d14 100644
--- a/canvas.c
+++ b/canvas.c
@@ -40,7 +40,7 @@ addlayer(Canvas *c, char *name)
{
Layer *l;
- l = newlayer(name, c->image->r, c->image->chan);
+ l = newlayer(name, c->image->r, RGBA32);
l->prev = c->layers.prev;
l->next = &c->layers;
c->layers.prev->next = l;
diff --git a/dat.h b/dat.h
index 352a394..f08a329 100644
--- a/dat.h
+++ b/dat.h
@@ -19,6 +19,7 @@ struct Layer
RFrame;
char *name;
Image *image;
+ Image *history[1024];
Layer *prev, *next;
};
diff --git a/main.c b/main.c
index b450841..647c3b0 100644
--- a/main.c
+++ b/main.c
@@ -63,6 +63,123 @@ mkcheckerboard(int w, int h)
return i;
}
+/*
+ * A draw operation that touches only the area contained in bot but not in top.
+ * mp and sp get aligned with bot.min.
+ */
+static void
+gendrawdiff(Image *dst, Rectangle bot, Rectangle top,
+ Image *src, Point sp, Image *mask, Point mp, int op)
+{
+ Rectangle r;
+ Point origin;
+ Point delta;
+
+ if(Dx(bot)*Dy(bot) == 0)
+ return;
+
+ /* no points in bot - top */
+ if(rectinrect(bot, top))
+ return;
+
+ /* bot - top ≡ bot */
+ if(Dx(top)*Dy(top)==0 || rectXrect(bot, top)==0){
+ gendrawop(dst, bot, src, sp, mask, mp, op);
+ return;
+ }
+
+ origin = bot.min;
+ /* split bot into rectangles that don't intersect top */
+ /* left side */
+ if(bot.min.x < top.min.x){
+ r = Rect(bot.min.x, bot.min.y, top.min.x, bot.max.y);
+ delta = subpt(r.min, origin);
+ gendrawop(dst, r, src, addpt(sp, delta), mask, addpt(mp, delta), op);
+ bot.min.x = top.min.x;
+ }
+
+ /* right side */
+ if(bot.max.x > top.max.x){
+ r = Rect(top.max.x, bot.min.y, bot.max.x, bot.max.y);
+ delta = subpt(r.min, origin);
+ gendrawop(dst, r, src, addpt(sp, delta), mask, addpt(mp, delta), op);
+ bot.max.x = top.max.x;
+ }
+
+ /* top */
+ if(bot.min.y < top.min.y){
+ r = Rect(bot.min.x, bot.min.y, bot.max.x, top.min.y);
+ delta = subpt(r.min, origin);
+ gendrawop(dst, r, src, addpt(sp, delta), mask, addpt(mp, delta), op);
+ bot.min.y = top.min.y;
+ }
+
+ /* bottom */
+ if(bot.max.y > top.max.y){
+ r = Rect(bot.min.x, top.max.y, bot.max.x, bot.max.y);
+ delta = subpt(r.min, origin);
+ gendrawop(dst, r, src, addpt(sp, delta), mask, addpt(mp, delta), op);
+ bot.max.y = top.max.y;
+ }
+}
+
+void
+zoomdraw(Image *d, Rectangle r, Rectangle top, Image *b, Image *s, Point sp, int f)
+{
+ Rectangle dr;
+ Image *t;
+ Point a;
+ int w;
+
+ a = ZP;
+ if(r.min.x < d->r.min.x){
+ sp.x += (d->r.min.x - r.min.x)/f;
+ a.x = (d->r.min.x - r.min.x)%f;
+ r.min.x = d->r.min.x;
+ }
+ if(r.min.y < d->r.min.y){
+ sp.y += (d->r.min.y - r.min.y)/f;
+ a.y = (d->r.min.y - r.min.y)%f;
+ r.min.y = d->r.min.y;
+ }
+ rectclip(&r, d->r);
+ w = s->r.max.x - sp.x;
+ if(w > Dx(r))
+ w = Dx(r);
+ dr = r;
+ dr.max.x = dr.min.x+w;
+ if(!alphachan(s->chan))
+ b = nil;
+ if(f <= 1){
+ if(b) gendrawdiff(d, dr, top, b, sp, nil, ZP, SoverD);
+ gendrawdiff(d, dr, top, s, sp, nil, ZP, SoverD);
+ return;
+ }
+ if((t = allocimage(display, dr, s->chan, 0, 0)) == nil)
+ return;
+ for(; dr.min.y < r.max.y; dr.min.y++){
+ dr.max.y = dr.min.y+1;
+ draw(t, dr, s, nil, sp);
+ if(++a.y == f){
+ a.y = 0;
+ sp.y++;
+ }
+ }
+ dr = r;
+ for(sp=dr.min; dr.min.x < r.max.x; sp.x++){
+ dr.max.x = dr.min.x+1;
+ if(b) gendrawdiff(d, dr, top, b, sp, nil, ZP, SoverD);
+ gendrawdiff(d, dr, top, t, sp, nil, ZP, SoverD);
+ for(dr.min.x++; ++a.x < f && dr.min.x < r.max.x; dr.min.x++){
+ dr.max.x = dr.min.x+1;
+ gendrawdiff(d, dr, top, d, Pt(dr.min.x-1, dr.min.y), nil, ZP, SoverD);
+ }
+ a.x = 0;
+ }
+ freeimage(t);
+}
+
+
void
drawstats(void)
{
@@ -70,7 +187,7 @@ drawstats(void)
Point o;
for(i = 0, o = Pt(10,10); i < nelem(stats); i++, o.y += font->height)
- stringn(screen, addpt(screen->r.min, o), pal[PCWhite], ZP, font, stats[i], sizeof stats[i]);
+ stringnbg(screen, addpt(screen->r.min, o), pal[PCWhite], ZP, font, stats[i], sizeof stats[i], pal[PCBlack], ZP);
}
void
@@ -88,15 +205,15 @@ drawcanvas(Canvas *c)
return;
for(l = c->layers.next; l != &c->layers; l = l->next)
drawlayer(l, c);
- draw(screen, rectaddpt(c->image->r, toscreen(c->p)), c->image, nil, ZP);
+ zoomdraw(screen, rectaddpt(Rpt(mulpt(c->image->r.min, zoom),mulpt(c->image->r.max, zoom)), toscreen(c->p)), ZR, nil, c->image, ZP, zoom);
}
void
redraw(void)
{
lockdisplay(display);
- draw(screen, screen->r, pal[PCBlack], nil, ZP);
- draw(screen, curcanvas == nil? screen->r: rectaddpt(curcanvas->image->r, toscreen(curcanvas->p)), background, nil, ZP);
+ gendrawdiff(screen, screen->r, curcanvas == nil? ZR: rectaddpt(Rpt(mulpt(curcanvas->image->r.min, zoom),mulpt(curcanvas->image->r.max, zoom)), toscreen(curcanvas->p)), pal[PCBlack], ZP, nil, ZP, S);
+ gendrawdiff(screen, curcanvas == nil? screen->r: rectaddpt(Rpt(mulpt(curcanvas->image->r.min, zoom),mulpt(curcanvas->image->r.max, zoom)), toscreen(curcanvas->p)), ZR, background, ZP, nil, ZP, S);
drawcanvas(curcanvas);
drawstats();
flushimage(display, 1);
@@ -196,6 +313,7 @@ rmb(Mousectl *mc, Keyboardctl *kc)
case NEWLAYER:
if(curcanvas == nil)
return;
+ snprint(buf, sizeof buf, "%s", curcanvas->layers.prev->name);
do{
if(enter("layer name", buf, sizeof buf, mc, kc, nil) <= 0)
return;
@@ -226,7 +344,9 @@ rmb(Mousectl *mc, Keyboardctl *kc)
fd = create(buf, OWRITE, 0666);
if(fd < 0)
return;
+ lockdisplay(display);
drawcanvas(curcanvas);
+ unlockdisplay(display);
writeimage(fd, curcanvas->image, 1);
close(fd);
break;
@@ -314,10 +434,16 @@ mouse(Mousectl *mc, Keyboardctl *kc)
mmb(mc, kc);
if((mc->buttons&4) != 0)
rmb(mc, kc);
- if((mc->buttons&8) != 0)
- zoom = clamp(++zoom, 0, MAXZOOM);
- if((mc->buttons&16) != 0)
- zoom = clamp(--zoom, 0, MAXZOOM);
+ if((mc->buttons&8) != 0){
+ zoom = clamp(++zoom, 1, MAXZOOM);
+ worldrf.bx = Vec2(zoom,0);
+ worldrf.by = Vec2(0,zoom);
+ }
+ if((mc->buttons&16) != 0){
+ zoom = clamp(--zoom, 1, MAXZOOM);
+ worldrf.bx = Vec2(zoom,0);
+ worldrf.by = Vec2(0,zoom);
+ }
}
void
@@ -328,10 +454,14 @@ key(Rune r)
case 'q':
threadexitsall(nil);
case '+':
- zoom = clamp(++zoom, 0, MAXZOOM);
+ zoom = clamp(++zoom, 1, MAXZOOM);
+ worldrf.bx = Vec2(zoom,0);
+ worldrf.by = Vec2(0,zoom);
break;
case '-':
- zoom = clamp(--zoom, 0, MAXZOOM);
+ zoom = clamp(--zoom, 1, MAXZOOM);
+ worldrf.bx = Vec2(zoom,0);
+ worldrf.by = Vec2(0,zoom);
break;
}
}