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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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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);

-- 
Ben.

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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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