Transparency of the layer is a property of your hardware. There is a few ways to set transparency for layers or surfaces. You have to try they and choose what is working properly for your goals.
1 Using SetSrcColorKey() see http://www.directfb.org/docs/DirectFB_Reference_1_0/IDirectFBDisplayLayer_SetSrcColorKey.html 2 Using SetDstColor() see http://www.directfb.org/docs/DirectFB_Reference_1_0/IDirectFBDisplayLayer_SetDstColorKey.html 3 You can too set some pixel format with alpha channel for the layer. (ARGB, ARGB4444, ARGB1555 and so on). In this case lower layer will appear through upper. Colour of result pixel can be calculated: Pscr = Plo * (1 - A) + Pup * A. Pscr is a screen pixel. Plo is a pixel of lower layer. Pup is a pixel of upper layer. A is a normalized value of the alpha channel from pixel of upper layer. If A is 0 - you'll see only background.If the alpha channel has the greatest value you'll see only upper pixel. -- Best Regards Nikita Egorov nik...@gmail.com nik...@varma-el.com
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