[Qemu-devel] [PATCH v5] showing a splash picture when start, seabios image for test

[Qemu-devel] [PATCH v5] showing a splash picture when start, seabios image for test

[xiaxia347work]

[-- Attachment #1: Type: text/plain, Size: 596 bytes --]

   The patch let qemu pass a compressed data to seabios.  This image
 support the compressed jpg/bmp file by LZMA algorithm.

    The attachment is the seabios image that help test the patch.  

usage:
    apply the patch for qemu.
    alternate the bios.bin.
    start x86 qemu with a specified splash-time and file name.

limitation in seabios:
     jpeg decoder have its limitation, it only accept jpg file with
width=16*M, height=16*N.
     bmp decoder only accept 24bpp file, with a resolution that a video
mode could support. Recommended is 640x480(mostly used).

2011-07-05

[-- Attachment #2: bios.bin --]
[-- Type: application/octet-stream, Size: 131072 bytes --]

Re: [Qemu-devel] [PATCH v5] showing a splash picture when start, seabios image for test

[Paul Brook]

>      jpeg decoder have its limitation, it only accept jpg file with
> width=16*M, height=16*N.
>      bmp decoder only accept 24bpp file, with a resolution that a video
> mode could support. Recommended is 640x480(mostly used).

Doing image decoding in the bios seems particularly pointless.  Why don't you 
just pass the bios raw image data?

If you really want to directly support fancier formats IMO it makes much more 
sense to do that in qemu itself.  There we can use the same libraries as 
everyone else (libjpeg, libpng, etc) rather than badly reimpleenting them 
inside the bios.

Paul

Re: [Qemu-devel] [PATCH v5] showing a splash picture when start, seabios image for test

[Wayne Xia]

于 2011-7-5 2:31, Paul Brook 写道:
>>       jpeg decoder have its limitation, it only accept jpg file with
>> width=16*M, height=16*N.
>>       bmp decoder only accept 24bpp file, with a resolution that a video
>> mode could support. Recommended is 640x480(mostly used).
>
> Doing image decoding in the bios seems particularly pointless.  Why don't you
> just pass the bios raw image data?
>
> If you really want to directly support fancier formats IMO it makes much more
> sense to do that in qemu itself.  There we can use the same libraries as
> everyone else (libjpeg, libpng, etc) rather than badly reimpleenting them
> inside the bios.
>
   I think the BMP file with 24bpp is almost the raw image data that 
need just a little format adjusting in bios according to the video mode 
it found.
    Jpeg and LZMA decoder are the old small functions that sea-bios 
support, so I think user could use that format as an option.

> Paul


-- 
Best Regards

Wayne Xia
mail:xiawenc@linux.vnet.ibm.com
tel:86-010-82450803

Re: [Qemu-devel] [PATCH v5] showing a splash picture when start, seabios image for test

[Wayne Xia]

于 2011-7-5 2:31, Paul Brook 写道:
>>       jpeg decoder have its limitation, it only accept jpg file with
>> width=16*M, height=16*N.
>>       bmp decoder only accept 24bpp file, with a resolution that a video
>> mode could support. Recommended is 640x480(mostly used).
>
> Doing image decoding in the bios seems particularly pointless.  Why don't you
> just pass the bios raw image data?
>
> If you really want to directly support fancier formats IMO it makes much more
> sense to do that in qemu itself.  There we can use the same libraries as
> everyone else (libjpeg, libpng, etc) rather than badly reimpleenting them
> inside the bios.
>
> Paul
   I think the BMP file with 24bpp is almost the raw image data that
need just a little format adjusting in bios according to the video mode
it found.
    Jpeg and LZMA decoder are the old small functions that sea-bios
support, so I think user could use that format as an option.

-- 
Best Regards

Wayne Xia
mail:xiawenc@linux.vnet.ibm.com
tel:86-010-82450803