People may find the following example:
http://people.redhat.com/otaylor/x/xr-knockout-example.c
http://people.redhat.com/otaylor/x/xr-knockout-example.png
useful. It contains:
- The Xlib boilerplate needed to get a window up on the screen,
handle exposes, etc.
- Expose compression code. (needed pretty badly until we get
a bit faster code for RENDER in the server)
- A simple oval_path routine for drawing circles.
- An example of using operators other than Over and Saturate
The knockout in the name does not indicate that it's especially
pretty; it just means that the example has to do with effects
similar to knockout-groups in PDF-1.4.
You can compile it with a makefile like:
===
CFLAGS=-I/opt/xf/include/ -Wall -O2
LIBS=-L/opt/xf/lib/ -lXr -lXc -lXft -lXrender -lXext -lX11 -lm
xr-knockout-example: xr-knockout-example.o
$(CC) -o $@ $< $(LIBS)
===
Regards,
Owen
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