static IDirectFBSurface *
_dfb_surface_from_data(IDirectFB *dfb, int w, int h, void *data)
{
IDirectFBSurface *s;
DFBSurfaceDescription desc;
DFBResult r;
desc.flags = (DSDESC_CAPS | DSDESC_WIDTH | DSDESC_HEIGHT |
DSDESC_PIXELFORMAT | DSDESC_PREALLOCATED);
desc.caps = DSCAPS_PREMULTIPLIED;
desc.width = w;
desc.height = h;
desc.preallocated[0].data = data;
desc.preallocated[0].pitch = w * 4;
desc.preallocated[1].data = NULL;
desc.preallocated[1].pitch = 0;
desc.pixelformat = DSPF_ARGB;
r = dfb->CreateSurface(dfb, &desc, &s);
if (r != DFB_OK)
{
ERR("Cannot create DirectFB surface: %s",
DirectFBErrorString(r));
return NULL;
}
s->SetPorterDuff(s, DSPD_SRC_OVER);
return s;
}
static mrb_value surface_set_porter_duff(mrb_state *mrb, mrb_value self)
{
IDirectFBSurface* surface = mrb_directfb_surface(mrb, self);
DFBResult ret = -1;
if (surface != NULL) {
mrb_int rule;
mrb_get_args(mrb, "i", &rule);
ret = surface->SetPorterDuff(surface, rule);
}
return mrb_fixnum_value(ret);
}