Re: Cairo 1.14.2 problems with Solaris 10, libXrender

On Wed, Aug 5, 2015 at 1:23 PM, Andreas F. Borchert <
[email protected]> wrote:

> The obvious intention was to keep the code in cairo-xlib-source.c
> tidy without myriads of #if directives. A better solution could
> be the replacement of
>
>    #define CAIRO_RENDER_HAS_GRADIENTS(surface) \
>       CAIRO_RENDER_AT_LEAST((surface), 0, 10)
>
> by
>
>    #define CAIRO_RENDER_HAS_GRADIENTS(surface) \
>       (HAVE_XRENDERCREATELINEARGRADIENT &&
>          CAIRO_RENDER_AT_LEAST((surface), 0, 10))
>
> and likewise for all the other macros of this kind in cairo-xlib-private.h.


I think that is already being done, at least in some of the image code I
was working on.

The problem is that if you write this:

   if (CAIRO_RENDER_HAS_GRADIENTS(surface))
      XRenderCreateLinearGraident(x);
   else
      ...

Actually that would still cause the compilation to fail because
XRenderCreateLinearGradient is not defined, even though the compiler can
tell that the if statement is always false. I assume that is the reason the
#define was done this way.

It might be better to #define it to assert(false)?

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