ref: 7caa9585434c771bea1aaf6d3317b969df5afa9d
dir: /page-invertone/
diff -r 813115218568 sys/src/cmd/page.c
--- a/sys/src/cmd/page.c Tue Jan 19 13:06:22 2016 +0100
+++ b/sys/src/cmd/page.c Sat Jan 23 01:35:43 2016 +0100
@@ -67,6 +67,7 @@
Cfitheight,
Crotate90,
Cupsidedown,
+ Cinv,
Cdummy1,
Cnext,
Cprev,
@@ -91,6 +92,7 @@
[Cfitheight] "fit height", 'h', 0, 0,
[Crotate90] "rotate 90", 'r', 0, 0,
[Cupsidedown] "upside down", 'u', 0, 0,
+ [Cinv] "invert", 'i', 0, 0,
[Cdummy1] "", 0, 0, 0,
[Cnext] "next", Kright, ' ', '\n',
[Cprev] "prev", Kleft, Kbs, 0,
@@ -1375,6 +1377,23 @@
}
void
+inv(Image *i)
+{
+ int n;
+ uchar *buf, *p;
+
+ n = imagesize(i);
+ buf = malloc(n);
+ if(buf == 0)
+ return;
+ unloadimage(i, i->r, buf, n);
+ for(p=buf; p<buf+n; p++)
+ *p = ~*p;
+ loadimage(i, i->r, buf, n);
+ free(buf);
+}
+
+void
showext(Page *p)
{
char label[64], *argv[4];
@@ -1494,6 +1513,13 @@
resize = subpt(screen->r.max, screen->r.min);
resize.x = 0;
goto Unload;
+ case Cinv:
+ if(current == nil || !canqlock(current))
+ break;
+ inv(current->image);
+ drawpage(current);
+ qunlock(current);
+ break;
case Czoomin:
case Czoomout:
if(current == nil || !canqlock(current))