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| 13:02.22 | T0mW | You truly never appreciate your hardwood floors until you wake to find that the dog has had the runs the night before... |
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| 13:31.30 | ben22 | Does anybody here know much about working with the framebuffer directly? I am trying to display images on an 18bpp display, and no matter what I try to convert 24bpp images into the correct format, I can't get anything but garbled images on screen |
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| 14:19.51 | madsy | ben22: 18bpp? That was a weird color depth |
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| 14:20.32 | madsy | ben22: Also, is it truecolor or indexed? |
| 14:22.32 | ben22 | madsy, I don't know how to check that, but fbset -i reports rgba 6/12,6/6,6/0,0/0 |
| 14:24.20 | ben22 | I am going through the pxa2xx developers manual now, but from what I can tell, the device I am trying this on (old gumstix verdex), has added a patch for 18bpp support, so I can't find any details in the manual. |
| 14:25.55 | madsy | Lots of things could go wrong. You could have shifted the values at the wrong bit positions. Or maybe the wrong padding is used. |
| 14:26.49 | madsy | For example, maybe each pixel is padded to 4 bytes, instead of 3 bytes |
| 14:27.03 | madsy | Or maybe padding is done at the end of each scanline |
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| 14:31.51 | ben22 | madsy, thanks, that has given me some clues. |
| 14:33.02 | madsy | ben22: I'm not sure how accurate fbset is. Whether it reports rgba to indicate 4 bytes per pixel, or if it's not intended. |
| 14:34.43 | ben22 | madsy, the framebuffer seems to accept 3 bytes, as I can 'fill' the framebuffer with a single colour. my next test was a gradient, which is when the problem became apparent. the result is stripes of colour across the screen. |
| 14:44.25 | madsy | Can you consistently fill the screen with a single color of your choice? |
| 14:47.20 | ben22 | I can do primary colours. Anything else... well, it doesn't seem to follow any logical pattern. |
| 15:17.51 | madsy | Hm, weird |
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