Hello,
I am having trouble getting transparent windows.
I am making an image slideshow and would like to write a title on top of
the image
with a background that is somewhat transparent. (The image is drawn to
the layer surface
and I want the text in a window)
I read that the window surface is created using the layers palette so I
tried setting
the layer background mode to DLBM_DONTCARE which made my windows
transparent just the
way i want them. But it seems DLBM_DONTCARE does not support clearing.
So I have been trying to give opacity capabilities to the layer and
setting the background
mode to DLBM_COLOR, hoping that I will be able to add transparency to my
windows but,
so far i cant seem to get it to work.
I always end up with a window on top of my layer that that has no
opacity and is filled
with the same color as the layer background.
How do I add opacity to my windows?
Any help is appreciated.
Daniel
{
DFBResult err;
DFBSurfaceDescription dsc;
DFBCHECK(DirectFBInit(&argc, &argv));
DFBCHECK(DirectFBCreate(&dfb));
dfb->GetDisplayLayer( dfb, DLID_PRIMARY, &layer );
layer->SetCooperativeLevel( layer, DLSCL_ADMINISTRATIVE );
layer->GetConfiguration( layer, &layer_config );
layer_config.flags = (DLCONF_PIXELFORMAT | DLCONF_OPTIONS);
layer_config.pixelformat = DSPF_ARGB;
layer_config.options = DLOP_OPACITY;
layer->SetConfiguration( layer, &layer_config );
layer->SetBackgroundMode(layer, DLBM_COLOR);
layer->SetBackgroundColor( layer, 255, 100, 100, 128 );
// layer->SetBackgroundMode(layer, DLBM_DONTCARE);
layer->SetOpacity(layer, 128);
layer->GetSurface(layer, &primary);
primary->SetDrawingFlags(primary, DSDRAW_BLEND);
DFBCHECK(primary->GetSize(primary, &xres, &yres));
// create window
DFBWindowDescription desc;
desc.flags = (DWDESC_POSX | DWDESC_POSY | DWDESC_WIDTH | DWDESC_HEIGHT
| DWDESC_CAPS);
desc.posx = 100;
desc.posy = 100;
desc.width = 250;
desc.height = 250;
desc.caps = DWCAPS_ALPHACHANNEL;
layer->CreateWindow(layer, &desc, &window);
window->GetSurface(window, &window_surface);
}
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