Composite Quesiton

[Huang, FrankR]

Hi, all

            

            I want to ask you guys a question about composite.

            A condition:

                        dest:           a 100x100 picture(all white
color)

                        source:       a 1x1 picture with repeat
parameter (PICT_x8r8g8b8, color green)

                        mask:         a 20x20 mask (PICT_a8)

 

            As we know, the rendering model is as below:

                        dest = (source IN mask) OP dest

 

 

            When I use XRenderComposite(), the call is as below:

                        XRenderComposite(dpy, PictOpSrc, source, mask,
dest, 0, 0, 0, 0, 50, 50, 40, 40)

 

            You can imagine the result of this test. I attached the
result of this application. I can understand the green part , but for
the black part, I have no idea. Is it all solid to black???

 

 

Thanks,

Frank 

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