altos/draw: Use damage for lco demo

[fw/altos] / src / draw / test-frame.c

diff --git a/src/draw/test-frame.c b/src/draw/test-frame.c
index a90dfc74543593360590f0e2fa07435d48786f45..fc054738c711c51193b65a2489182e4e9e80b298 100644 (file)
--- a/src/draw/test-frame.c
+++ b/src/draw/test-frame.c
@@ -44,7 +44,8 @@ static struct ao_bitmap fb = {
        .base = bits,
        .stride = STRIDE,
        .width = WIDTH,
-       .height = HEIGHT
+       .height = HEIGHT,
+       .damage = AO_BOX_INIT,
 };
 
 static XImage *shm_image;
@@ -83,11 +84,11 @@ DoDisplay(Display *dpy, Window win, GC gc)
        else
                image = nonshm_image;
 
-       scan = bits;
-       for (iy = 0; iy < HEIGHT; iy++) {
+       scan = bits + STRIDE * fb.damage.y1;
+       for (iy = fb.damage.y1; iy < fb.damage.y2; iy++) {
                w = scan;
                scan += STRIDE;
-               for (ix = 0; ix < WIDTH; ix += 32) {
+               for (ix = fb.damage.x1 & ~31; ix < fb.damage.x2; ix += 32) {
                        d = *w++;
                        for (ib = 0; ib < 32 && ix + ib < WIDTH; ib++) {
                                unsigned long p = d & 1 ? white : black;
@@ -105,4 +106,5 @@ DoDisplay(Display *dpy, Window win, GC gc)
                XShmPutImage(dpy, win, gc, image, 0, 0, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, False);
        else
                XPutImage(dpy, win, gc, image, 0, 0, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
+       ao_damage_set_empty(&fb);
 }