[cairo] Fwd: cairo_paint() with GPU Buffer
psychon at znc.in
Mon Feb 11 08:07:11 UTC 2019
On 11.02.19 08:11, Abimathi Natarajan wrote:
> The above command will decode the input file (input.mp4) with
> hardware accelerations(vaapi) and hwmap will directly map the hardware
> frames to system memory.
> - I will directly feed this memory to
> cairo_image_surface_create_for_data ((unsigned char
> *)buffer, CAIRO_FORMAT_ARGB32,width, height, stride) to create a
> cairo_surface for the given frame.
>From the information you provided, I can only make a guess. My guess is
that CPU access to the buffer in GPU memory is uncached and thus slow.
You could try copying the image to a buffer in main memory and using
that copy for cairo_image_surface_create_for_data(). That way
cairo/pixman get to operate on cached memory.
"Are you preparing for another war, Plutarch?" I ask.
"Oh, not now. Now we're in that sweet period where
everyone agrees that our recent horrors should never
be repeated," he says.
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