Ah, never mind I resolved this by using a mask! I did notice a particular bug with using a PIXMAN_a8 mask on images of sizes not divisible by 4 such as a width 854. The alpha of the mask was completely ignored. I was using composite with PIXMAN_OP_OVER and running an arm build neon disabled.
On Fri, Aug 21, 2015 at 11:39 AM, Jonathan Meson <j...@visualblasters.com> wrote: > Hey guys, I'm new to the list. I'm very excited about this powerful > library and slowly understanding how to use it properly. > > So, I'm looking to modify the opacity of an image but I'm not sure how. I > attempted to do some research and try some things but it was a bit hard > finding documentation or samples. > > The simple formula to set opacity at 50% is: > float alpha = 0.5f; > C = c*alpha; > A = a*alpha; > > However, I'm not sure how to achieve this using pixman_image_composite or > any other method from the pixman library. > > Thanks for any details or guidance with respect to this. > > -- > *Jonathan Meson* > *CEO and Lead Engineer* > Visual Blasters LLC > 717-813-4287 > -- *Jonathan Meson* *CEO and Lead Engineer* Visual Blasters LLC 717-813-4287
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