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Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio

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On 6/12/23 09:48, Ben Bacarisse wrote:
> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
> 
>> Blue-Maned_Hawk <bluemanedhawk@gmail.com> writes:
>>
>>> On 6/11/23 20:07, Ben Bacarisse wrote:
>>>> Blue-Maned_Hawk <bluemanedhawk@gmail.com> writes:
>> <cut>
>>>>> cairo_xlib_surface_set_size(cairo_get_target(root_instance), fmax(width,
>>>>> e.xconfigure.width), fmax(height, e.xconfigure.height));
>>>> This case looks odd.  What's the intent?  Do you want stop the user
>>>> making the window narrower than width or shorted than height?
>>>
>>> Yes, i do.  I didn't know of any other way to do this.
>>>
>>>>                                                                If that's
>>>> what you want you should probably limit e.xconfigure.{width,height}, set
>>>> the X window size and then carry on as before because you still need to
>>>> set the offset and scale and offset the source in this case as well.
>>>
>>> How would i do that?
>>
>> You could change e.xconfigure.width (and height) but rather than do that
>> I'd base all the code on two new sizes
>>
>>    int new_width = e.xconfigure.width, new_height = e.xconfigure.height;
>>    if (new_width < width || new_height < height) {
>>       new_width = fmax(width, new_width);
>>       ditto height
>>       set Xwindow size to new_width/new_height
>>    }
>>    what goes here is what was your else clause but using new_width and
>>    new_height rather than the e.xconfigure versions
> 
> Correction.  This is a bad idea!  The correct way to do this is to rope
> in the window manager.  Include X11/Xutil.h and then, after creating the
> window, do
> 
>       XSizeHints sizeHints = {
>            .flags = PMinSize, .min_width = width, .min_height = height
>       };
>       XSetWMNormalHints(display, window, &sizeHints);
> 

​Thank you!  This does exactly what i was trying to do!

-- 
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Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2023-06-11 19:13 -0400
  Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-06-12 01:07 +0100
    Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2023-06-11 20:54 -0400
      Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-06-12 12:24 +0100
        Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-06-12 14:48 +0100
          Re: Running into problems while trying to scale Cairo surface to take up maximum space at specific aspect ratio Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2023-06-12 14:23 -0400

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