Public bug reported:
libgdiplus' cairo backend only takes the fontconfig *match* to render
glyphs in cairo, with zero considerations for substitutes. This causes
significant problems when a developer using WinForms tries to display
some CJK glyphs in "Sans", while expecting system-like handling for
these bugs. Tofus will show up in such cases if the first candidate
generated from `fc-match Sans` is not a font with CJK glyphs.
This modified version of WinForms 'hello world' should be able to show
this bug:
```C#
using System;
using System.Drawing;
using System.Windows.Forms;
public class HelloWorld : Form
{
static public void Main ()
{
Application.Run (new HelloWorld ());
}
public HelloWorld ()
{
Button b = new Button ();
b.Text = "Tofus? → 我是方框。";
b.Font = new Font("Sans", 11);
b.Click += new EventHandler (Button_Click);
Controls.Add (b);
}
private void Button_Click (object sender, EventArgs e)
{
MessageBox.Show ("Does it taste good?");
}
}
```
Note this problem is not limited to "Sans", nor CJK chars -- I am just
using these for a common-enough example. In real life developers trying
to do cross-platform Winforms development might instead just use the
default fonts ("MS Sans Serif" or "Tahoma" on Mono), and still bump into
the very same blocks of tofu, perhaps with the emojis sent by their
happy users.
A possible workaround is to try the experimental pango backend, but that
is really very experimental. There is a pending PR at
https://github.com/mono/libgdiplus/pull/39, which is said to be
"basically approved" back in 2009. (Yeah, mono devs are getting tired of
desktop it seems.)
** Affects: libgdiplus
Importance: Unknown
Status: Unknown
** Affects: libgdiplus (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: bugzilla.xamarin.com/ #39418
http://bugzilla.xamarin.com/show_bug.cgi?id=39418
** Also affects: libgdiplus via
http://bugzilla.xamarin.com/show_bug.cgi?id=39418
Importance: Unknown
Status: Unknown
** Description changed:
libgdiplus' cairo backend only takes the fontconfig *match* to render
glyphs in cairo, with zero considerations for substitutes. This causes
significant problems when a developer using WinForms tries to display
some CJK glyphs in "Sans", while expecting system-like handling for
these bugs. Tofus will show up in such cases if the first candidate
generated from `fc-match Sans` is not a font with CJK glyphs.
This modified version of WinForms 'hello world' should be able to show
this bug:
```C#
using System;
using System.Drawing;
using System.Windows.Forms;
public class HelloWorld : Form
{
- static public void Main ()
- {
- Application.Run (new HelloWorld ());
- }
+ static public void Main ()
+ {
+ Application.Run (new HelloWorld ());
+ }
- public HelloWorld ()
- {
- Button b = new Button ();
- b.Text = "Tofus? → 我是方框。";
- b.Font = new Font("Sans", 11);
- b.Click += new EventHandler (Button_Click);
- Controls.Add (b);
- }
+ public HelloWorld ()
+ {
+ Button b = new Button ();
+ b.Text = "Tofus? → 我是方框。";
+ b.Font = new Font("Sans", 11);
+ b.Click += new EventHandler (Button_Click);
+ Controls.Add (b);
+ }
- private void Button_Click (object sender, EventArgs e)
- {
- MessageBox.Show ("Button Clicked!");
- }
+ private void Button_Click (object sender, EventArgs e)
+ {
+ MessageBox.Show ("Does it taste good?");
+ }
}
```
Note this problem is not limited to "Sans", nor CJK chars -- I am just
using these for a common-enough example. In real life developers trying
to do cross-platform Winforms development might instead just use the
default fonts ("MS Sans Serif" or "Tahoma" on Mono), and still bump into
the very same blocks of tofu, perhaps with the emojis sent by their
happy users.
A possible workaround is to try the experimental pango backend, but that
is really very experimental. There is a pending PR at
https://github.com/mono/libgdiplus/pull/39, which is said to be
"basically approved" back in 2009. (Yeah, mono devs are getting tired of
desktop it seems.)
--
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https://bugs.launchpad.net/bugs/1578749
Title:
fontconfig substitutes not considered by libgdiplus
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