On Mon, 27 Aug 2007, Tabaro Toni wrote:
Hi, i have succesfully cross-compiled the xfree 4.7.0 on a embedded board with mipsel processor and framebuffer on a 2.6.12 linux environment, with the framebuffer running at 960x1080x32 ARGB8888 or 1280x720x16 ARGB1555. The Xfbdev program start and work (if i export a display on a i386 machine and start xclock the xclock program work). The problem is: to see the image on the board i must run a program in background which set the alpha bit to 1 (on the 1280x720x16 ARGB 1555 frame buffer) or byte to 0xff (in the case of 960x1080x32 ARGB8888), otherwise the screen remains black.
That is an oddball alpha implementation. What adapter is this? Does the (text) screen appear correctly before starting Xfbdev?
I think the Xfbdev can't handle the alpha channel correctly, leaving it to 0. I dont need the translucency or other features, only see the image on screen, maybe i can patch the framebuffer code to leave the alpha at fixed value, is someone able to help me by suggest the part of code to patch? I searched on the programs/Xserver/hw/tinyx/fbdev/ or programs/Xserver/fb/ path, but i am not able to understand how the alpha is handled :-(
The X server does not touch the alpha channel, but uses whatever applications provide in that field.
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