On Thu, Sep 26, 2024 at 07:38:23AM +0200, Ahmad Fatoum wrote: > On 25.09.24 16:34, Sascha Hauer wrote: > > When we have a background image we want the background to actually shine > > through, so set the alpha value of the background to transparent and not > > opaque. > > > > Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de> > > Reviewed-by: Ahmad Fatoum <a.fat...@pengutronix.de> > > I wonder if this could cause a slow down for framebuffers with no alpha > channel, > because it will read the framebuffer on every pixel write for alpha blending > purposes, even if ultimately unnecessary?
A pixel is drawn with gu_set_pixel() which doesn't read at all. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
