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    Just evaluating `Display extent` will tell you the pixel resolution
    that Pharo is using. Maximizing the Pharo window, and checking the
    pixel resolution of the physical screen, and what MacOS thinks about
    what the pixel resolution is will give useful information. If all
    these match, then Pharo is using real resolution. If not, it is
    fake. Trying this both in Retina and external screen may help
    understand the behavior you see.<br>
    <br>
    But still, the real question is: is it possible to know the pixel
    pitch? The real DPI of the physical screen?<br>
    <br>
    On 3/1/2023 8:38 PM, Ignacio Sniechowski via Cuis-dev wrote:
    <blockquote
cite="mid:CAMCzT-bnJ60KOyb29G1C5aNLMPybsxc4KJz0prn1iotsx9UKXQ@mail.gmail.com"
      type="cite">
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        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">Hi Juan.</div>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">Starting my job here. From what I've
          been researching in Pharo it seems that SDL2 is used. </div>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">There's a process running </div>
        <div class="gmail_default"><font face="monospace">OSSDL2Driver
            >> eventLoopProcessWithoutPlugin</font></div>
        <font face="monospace"> <span class="gmail_default"
            style="font-family: monospace; font-size: large;">    </span>|
          event session |<br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>event := SDL_Event new.<br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>session := Smalltalk
          session.<br>
          <br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>[ session == Smalltalk
          session] <br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>whileTrue: [<br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>[ (SDL2 pollEvent: event)
          > 0 ] <br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>whileTrue: [ self
          processEvent: event ].<br>
          <br>
          <span class="gmail_default" style="font-family: monospace;
            font-size: large;">     </span>(Delay forMilliseconds: 5)
          wait ]</font>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;"><br>
        </div>
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          font-size: large;"><br>
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        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">And also there's a class
          OSSDL2BackendWindows with a method</div>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">fetchDPI</div>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">That seems to adjust the scale factor. So
          evidence seems to point that they are using fake resolution.</div>
        <div class="gmail_default" style="font-family: monospace;
          font-size: large;">I will check with Squeak</div>
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                                            <div><b><font size="2">Ignacio
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        <div dir="ltr" class="gmail_attr">On Wed, Mar 1, 2023 at 9:48 AM
          Juan Vuletich <<a moz-do-not-send="true"
            href="mailto:juan@cuis.st">juan@cuis.st</a>> wrote:<br>
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          <div bgcolor="#ffffff"> Hi Nacho,<br>
            <br>
            This is a great opportunity for you to help Cuis!<br>
            <br>
            - Is Pharo aware of the true pixel resolution both in Retina
            and External displays?<br>
            - Is Pharo aware of the true pixel pitch both in Retina and
            External displays?<br>
            <br>
            Answering these questions may take a little time of
            researching the system. Would you do it for us?<br>
            <br>
            If the answer to both is YES, then we really need to learn
            how they do it and try to do the same in Cuis.<br>
            <br>
            If the answer is NO, maybe they are running at fake pixel
            resolution and fake pixel pitch. Then, using the Mac zoom
            you could check that a Pharo pixel doesn't correspond to a
            physical display pixel. If this is the case, then the
            solution is not interesting, because running at true pixel
            resolution is crucial to good visual quality.<br>
            <br>
            Thanks!<br>
            <br>
            On 3/1/2023 8:20 AM, Ignacio Sniechowski via Cuis-dev wrote:
            <blockquote type="cite">
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                <div class="gmail_default" style="font-family:
                  monospace; font-size: large;">Hi Juan!</div>
                <div class="gmail_default" style="font-family:
                  monospace; font-size: large;">Thanks for your
                  prompt reply</div>
                <div class="gmail_default" style="font-family:
                  monospace; font-size: large;">Yes, I mean Pharo.
                  Didn't try Squeak. At least using Pharo 10 on a mac
                  and moving the window from the internal screen to the
                  external monitor adapts automatically...</div>
                <div class="gmail_default" style="font-family:
                  monospace; font-size: large;">Cheers!</div>
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                  monospace; font-size: large;"><br>
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                                                    <div><b><font
                                                          size="2">Ignacio

                                                          Sniechowski</font></b><b><br>
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              <div class="gmail_quote">
                <div dir="ltr" class="gmail_attr">On Wed, Mar 1, 2023 at
                  8:15 AM Juan Vuletich <<a moz-do-not-send="true"
                    href="mailto:juan@cuis.st" target="_blank">juan@cuis.st</a>>
                  wrote:<br>
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                  <div bgcolor="#ffffff"> Hi Nacho,<br>
                    <br>
                    The VM doesn't tell the image about pixel pitch. It
                    would be nice if Cuis could automatically adapt to
                    it.<br>
                    <br>
                    When you say "as other open-source Smalltalk do", do
                    you mean that Squeak or Pharo know the actual pixel
                    pitch?<br>
                    <br>
                    Thanks,<br>
                    <br>
                    On 3/1/2023 7:57 AM, Ignacio Sniechowski via
                    Cuis-dev wrote:
                    <blockquote type="cite">
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                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">Hi!<br
                            clear="all">
                        </div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">Hope everyone is
                          okay.</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">This is a
                          question for those who have displays (or
                          notebooks) with "retina" like displays. </div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">How do you
                          manage the size of the GUI elements and fonts?</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">If I set Cuis to
                          work correctly on an external, full HD
                          monitor, then when using the internal display
                          of my mac, everything is enormous, and
                          vice-versa.</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">It is a
                          VM-related issue or some configuration that I
                          have to do on Cuis.</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">But either the
                          VM or Cuis is unaware (as other open-source
                          Smalltalk do) of which kind of display one
                          uses.</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">Thanks!</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">Cheers</div>
                        <div class="gmail_default" style="font-family:
                          monospace; font-size: large;">Nacho</div>
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                                                          <div><b><font
                                                          size="2">Ignacio


                                                          Sniechowski</font></b><b><br>
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                    <pre cols="72">-- 
Juan Vuletich
<a moz-do-not-send="true" href="http://cuis.st" target="_blank">cuis.st</a>
<a moz-do-not-send="true" href="http://github.com/jvuletich" target="_blank">github.com/jvuletich</a>
<a moz-do-not-send="true" href="http://researchgate.net/profile/Juan-Vuletich" target="_blank">researchgate.net/profile/Juan-Vuletich</a>
<a moz-do-not-send="true" href="http://independent.academia.edu/JuanVuletich" target="_blank">independent.academia.edu/JuanVuletich</a>
<a moz-do-not-send="true" href="http://patents.justia.com/inventor/juan-manuel-vuletich" target="_blank">patents.justia.com/inventor/juan-manuel-vuletich</a>
<a moz-do-not-send="true" href="http://linkedin.com/in/juan-vuletich-75611b3" target="_blank">linkedin.com/in/juan-vuletich-75611b3</a>
<a moz-do-not-send="true" href="http://twitter.com/JuanVuletich" target="_blank">twitter.com/JuanVuletich</a></pre>
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            <br>
            <pre cols="72">-- 
Juan Vuletich
<a moz-do-not-send="true" href="http://cuis.st" target="_blank">cuis.st</a>
<a moz-do-not-send="true" href="http://github.com/jvuletich" target="_blank">github.com/jvuletich</a>
<a moz-do-not-send="true" href="http://researchgate.net/profile/Juan-Vuletich" target="_blank">researchgate.net/profile/Juan-Vuletich</a>
<a moz-do-not-send="true" href="http://independent.academia.edu/JuanVuletich" target="_blank">independent.academia.edu/JuanVuletich</a>
<a moz-do-not-send="true" href="http://patents.justia.com/inventor/juan-manuel-vuletich" target="_blank">patents.justia.com/inventor/juan-manuel-vuletich</a>
<a moz-do-not-send="true" href="http://linkedin.com/in/juan-vuletich-75611b3" target="_blank">linkedin.com/in/juan-vuletich-75611b3</a>
<a moz-do-not-send="true" href="http://twitter.com/JuanVuletich" target="_blank">twitter.com/JuanVuletich</a></pre>
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    <pre class="moz-signature" cols="72">-- 
Juan Vuletich
cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
linkedin.com/in/juan-vuletich-75611b3
twitter.com/JuanVuletich</pre>
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