ref: 20557a701a58427918a503d97c0fcd7f4756b4f7
dir: /page-invert/
diff 6e64d30454f71ecda88dba1bd792e97509115d73 uncommitted
--- a//sys/src/cmd/page.c
+++ b//sys/src/cmd/page.c
@@ -33,6 +33,7 @@
int imode;
int newwin;
int rotate;
+int invert;
int viewgen;
int forward; /* read ahead direction: >= 0 forwards, < 0 backwards */
Point resize, pos;
@@ -67,6 +68,7 @@
Cfitheight,
Crotate90,
Cupsidedown,
+ Cinvert,
Cdummy1,
Cnext,
Cprev,
@@ -91,6 +93,7 @@
[Cfitheight] "fit height", 'h', 0, 0,
[Crotate90] "rotate 90", 'r', 0, 0,
[Cupsidedown] "upside down", 'u', 0, 0,
+ [Cinvert] "invert", 'i', 0, 0,
[Cdummy1] "", 0, 0, 0,
[Cnext] "next", Kright, ' ', '\n',
[Cprev] "prev", Kleft, Kbs, 0,
@@ -894,6 +897,26 @@
}
void
+invertimage(Image *i)
+{
+ int n, m;
+ uchar *b;
+ uintptr *buf, *p;
+
+ n = imagesize(i);
+ if((buf = malloc(n)) == nil)
+ return;
+ unloadimage(i, i->r, (uchar*)buf, n);
+ m = n;
+ for(p=buf; m>=sizeof *p; m-=sizeof *p, p++)
+ *p = ~*p;
+ for(b=(uchar*)p; m>0; m--, b++)
+ *b = ~*b;
+ loadimage(i, i->r, (uchar*)buf, n);
+ free(buf);
+}
+
+void
loadpage(Page *p)
{
int fd;
@@ -913,6 +936,8 @@
p->open = nil;
else {
lockdisplay(display);
+ if(invert)
+ invertimage(p->image);
imemsize += imagesize(p->image);
unlockdisplay(display);
}
@@ -1492,6 +1517,9 @@
zoom = 1;
resize = subpt(screen->r.max, screen->r.min);
resize.x = 0;
+ goto Unload;
+ case Cinvert:
+ invert = !invert;
goto Unload;
case Czoomin:
case Czoomout: