[9fans] Q: libdraw, loadimage, allocimage

[9fans] Q: libdraw, loadimage, allocimage

[a.b]

hi!

could anyone, please, help me?

i have no problem with line, fillelipse, bezier and so on.
but i can't put bitmap image onto screen. i red man, draw.h, faces,
but my code is not working. 
could you show me the solution for this code:

uchar bitmap[]={0xff,0x00.......}    /* CMAP8 image */
image=allocimage("help me here!");
loadimage(image,bitmap,sizeof(bitmap),"help me here!");
draw("help me here!");

thank everyone for help :-)
Sasa Babic (a.b@email.cz)


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Re: [9fans] Q: libdraw, loadimage, allocimage

[mirtchov]

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I had a long winded reply which died with my drawterm,
unfortunately...

Anyway, take a look at the example I've attached here, and also at the
xscr hacks:

	http://pages.cpsc.ucalgary.ca/~mirtchov/p9/xscr/xscr.tar.gz

The key with loadimage() is to avoid using it if possible -- it
circumvents optimizations in the draw() design by loading data over
the network all the time.  Very slow over slow networks.

Compare for example 'eruption', which does 'loadimage' for the entire
display, rd-bomb, which does loadimage of a 256x256 bitmap, and
polyominoes, which uses pre-allocated color palette stored on the
display machine and see which one is faster...

andrey

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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>

void
eresized(int new)
{
	USED(new);
	exits("done");
}

void
main(int argc, char **argv)
{
	Image *img;
	Mouse m;
	uchar bmp[256];
	ulong tick = 0;
	int i;

	USED(argc, argv);

	if(initdraw(nil, nil, "bmap") < 0)
		sysfatal("initdraw failed: %r");

	einit(Emouse);

	img = allocimage(display, Rect(0, 0, 16, 16), CMAP8, 1, DCyan);
	if(img == nil)
		sysfatal("cannot allocate image: %r\n");

	/* set so it replicates over the entire window */
	replclipr(img, 1, Rect(0, 0, Dx(screen->r), Dy(screen->r)));

	for(;;) {
		for(i = 0; i < 256; i++)
			bmp[i] = tick++;
		tick++;

		/* fill it up with whatever is in bitmap */
		loadimage(img, Rect(0, 0, 16, 16), bmp, 16*16);

		/* draw it over the entire screen */
		draw(screen, screen->r, img, nil, ZP);

		flushimage(display, 1);

		if(ecanmouse()) {
			m = emouse();
			if(m.buttons)
					exits(0);
		}
	}

}

Re: [9fans] Q: libdraw, loadimage, allocimage

[okamoto]

> Compare for example 'eruption', which does 'loadimage' for the entire
> display, rd-bomb, which does loadimage of a 256x256 bitmap, and
> polyominoes, which uses pre-allocated color palette stored on the
> display machine and see which one is faster...

or try
http://basalt.cias.osakafu-u.ac.jp/plan9/plumb.tgz

This is a games/plumb.☺

Kenji