Here are three patches that simplify the type signature of the
iterator initializers. The signature before:
void (*pixman_iter_init_func_t) (pixman_implementation_t *imp,
pixman_iter_t *iter,
pixman_image_t *image,
int x,
int y,
int width,
int height,
uint8_t *buffer,
iter_flags_t flags);
void (*pixman_iter_init_func_t) (pixman_implementation_t *imp,
pixman_iter_t *iter);
They achieve this by passing all the information in the iterator
itself rather than as arguments.
This means the role of _pixman_implementation_{src,dest}_iter_init()
changes. Before they were wrappers around the implementation
functions; now they are convenience functions that store the various
parameters in the iterator and then call into the implementation.
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