In message <[EMAIL PROTECTED]>
Sven Neumann <[EMAIL PROTECTED]> wrote:
> Hi,
>
> [EMAIL PROTECTED] (Simon Willcocks) writes:
>
> > I'm writing a program that needs to plot images on the screen and it works
> > fine for any image without a mask, but when I try one with a mask the
> > transparent pixels come out in strange colours (e.g. mauve, light green,
> > apparently different for each image).
> >
> > The images, whether PNG or GIF display fine under Konquerer, but dfbshow
> > (from the C++ examples) has the same problem I do.
> >
> > I can attach a 711 byte example GIF file to a future message (or mail
> > direct) if anyone wants it.
>
> It would be more helpful if you could show us some example code that
> shows how you load and display the images. It would also help to let
> us know which version of DirectFB you are using.
Apologies! The versions are:
DirectFB-0.9.20
DFB++-0.9.20
I thought my code was irrelevant since the example class DFBImage in
DFB++-0.9.20/examples/dfbimage.cpp had the same problem. I could extract
the parts in question, but since they were based on the example code I think
it's better to discuss that.
dfbshow is built from the files dfbimage.cpp, dfbapp.cpp and dfbshow.cpp;
here are the relevant sections:
>From dfbimage.cpp, DFBImage::LoadImage:
dfb = DirectFB::Create();
provider = dfb->CreateImageProvider( filename.data() );
provider->GetImageDescription( &m_desc );
provider->GetSurfaceDescription( &desc );
if (width)
desc.width = width;
if (height)
desc.height = height;
surface = dfb->CreateSurface( desc );
provider->RenderTo( surface, NULL );
m_flags = DSBLIT_NOFX;
if (m_desc.caps & DICAPS_ALPHACHANNEL)
//*** This is *not* the case for my image
DFB_ADD_BLITTING_FLAG( m_flags, DSBLIT_BLEND_ALPHACHANNEL );
if (m_desc.caps & DICAPS_COLORKEY) {
//*** This flag *is* set and call made
DFB_ADD_BLITTING_FLAG( m_flags, DSBLIT_SRC_COLORKEY );
surface->SetSrcColorKey( m_desc.colorkey_r,
m_desc.colorkey_g,
m_desc.colorkey_b );
}
// provider and dfb are subsequently Released.
>From dfbshow.cpp, DFBShow::Render (called by DFBApp::Run at startup and
followed by a Flip of the surface):
surface->Clear();
surface->Blit( m_image, NULL, x, y );
The surface parameter is m_primary, created in DFBApp as follows:
m_dfb = DirectFB::Create();
DFBSurfaceDescription dsc;
dsc.flags = DSDESC_CAPS;
dsc.caps = DSCAPS_PRIMARY;
DFB_ADD_SURFACE_CAPS( dsc.caps, DSCAPS_FLIPPING );
m_primary = m_dfb->CreateSurface( dsc );
I hope this helps.
If anyone with dfbshow compiled/installed could try to display an image with
a simple mask and tell me if you can see through it or not, I'd appreciate
even that!
Regards,
Simon
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