Hello all, I have a question about mode selection; more specifically about the bit depth of the surface.
Looking in systems/fbdev/fbdev.c in primarySetRegion, I see that DirectFB iterates over the available modes and compares the requested width and height, but not the bit depth. Also, I see that a "priority" is checked, but I can't find anywhere where this priority is actually set. I ran into this while investigating the bug reported at http:// www.directfb.org/mantis/view.php?id=32, and looking at the resulting rgb codes it looks to me like there is some intermediate RGB565 conversion going on. I put some debugging printfs in primarySetRegion (notably printing out highest->bpp), and it seems to pick a [EMAIL PROTECTED] bit screen, which I thought would explain the results seen on a Via CLE266. However, when I try the test app included with the bug report on my laptop (Radeon M9), the resulting rgb values _are_ correct - and even there, DirectFB seems to pick a 16 bit screen. Also, adding printfs in dfb_fbdev_set_mode, printing out var.bits_per_pixel and mode->bpp, I see a lot of mode->bpp - 16 (12 times), then one var.bits_per_pixel = 16, then the (*) DirectFB/Code/ WM: Default 0.2 (Convergence GmbH) line, then one more var.bits_per_pixel = 16, then 5 times var.bits_per_pixel = 32, then I see my primarySetRegion printf (saying a [EMAIL PROTECTED] mode is selected), then finally one more var.bits_per_pixel = 32. Since the code attached to the bug report reads data back from the frame buffer as 32 bit RGB values, apparently the buffer _is_ set to a 32 bit mode. Looking at /etc/fb.modes, I notice that there are no 32 bit modes listed. So I guess I have the following questions: - Am I supposed to be able to select 32 bit frame buffer modes at all? - Is SetVideoMode supposed to fall back to a lower bit depth when the requested one is not available? - Is it possible that the unichrome driver somehow uses 16bit palette lookups when doing a LUT8 blit to a 32bit surface? Thanks for any hints, Sander Stoks _______________________________________________ directfb-users mailing list [email protected] http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
