Hi,
On 14.01.2014 16:13, Tom Gundersen wrote:
On Tue, Jan 14, 2014 at 2:15 PM, Joonas Lahtinen
<joonas.lahti...@linux.intel.com> wrote:
I've implemented very basic BMP support and commited it.
The custom format was there for best possible speed to be achieved when
displaying the splash, as the original use case is extremely time critical.
I will look into the speed differences and see if there's still need to use
the custom format.
In case it is still causing your trouble, the BMP parser can certainly
be optimized a bit. In particular, if you target a specific format
(e.g. without alpha support etc).
By our measurements, the original BGRX code only adds some 5
milliseconds to the boot time compared to no logo at all, where the BMP
code adds almost 70 milliseconds.
I think the most difference comes from the fact that in the BGRX file
the pixel data is already in format suitable format for UEFI blit
operations, and pixels are pushed to the blit operation as a big batch,
just like they are loaded as one big batch. The BMP code invidually
loops each pixel. Would the BGRX format be accepted aside the BMP
format, for these speed reasons?
Regards, Joonas
Cheers,
Tom
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