I just thought of this truly horrifying use for offscreen bitmap rendering:
----8<----
/* Something silly you can do with bitmap rendering... */
#include <picogui.h>
pghandle bBitmap,wButton;
pgcontext gc;
void animate(void) {
static int frame = 0;
/* A little drawing... */
pgSetColor(gc,0xFFFFFF);
pgRect(gc,0,0,15,15);
pgSetColor(gc,0x000000);
pgFrame(gc,0,0,15,15);
pgLine(gc,frame,0,14-frame,14);
pgLine(gc,0,14-frame,14,frame);
if ((++frame)==15) frame = 0;
/* FIXME: This is just a hack, need a better way to
* force bitmap redraw. */
pgSetWidget(wButton,PG_WP_BITMAP,bBitmap,0);
pgUpdate();
}
int main(int argc, char **argv) {
pgInit(argc,argv);
pgRegisterApp(PG_APP_NORMAL,"Animated Button",0);
bBitmap = pgCreateBitmap(15,15);
gc = pgNewBitmapContext(bBitmap);
pgNewWidget(PG_WIDGET_TOOLBAR,0,0);
wButton = pgNewWidget(PG_WIDGET_BUTTON,PG_DERIVE_INSIDE,PGDEFAULT);
pgSetWidget(PGDEFAULT,
PG_WP_TEXT,pgNewString("Nifty!"),
PG_WP_BITMAP,bBitmap,
0);
pgSetIdle(75,&animate);
pgEventLoop();
return 0;
}
----8<----
--
To the systems programmer, users and applications serve only to provide a
test load.
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