gdiplus: Implement GdipIsVisiblePoint

[Andrew Eikum]

Nikolay Sivov wrote:
> Andrew Eikum wrote:
>> ---
>>  dlls/gdiplus/graphics.c       |   19 ++++-
>>  dlls/gdiplus/tests/graphics.c |  162 
>> +++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 177 insertions(+), 4 deletions(-)
> Could you do it in opposite direction - implement "I" version on top of 
> GdipIsVisiblePoint?
> 
> This is how the rest of similar cases already works.

Of course.  Just simplified the code to do it the other way around. 
Though I guess that might be confusing looking at a stack trace.

Thanks
Andrew