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STR #3309
| Application: | FLTK Library |
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| Status: | 1 - Closed w/Resolution |
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| Priority: | 1 - Request for Enhancement, e.g. asking for a feature |
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| Scope: | 2 - Specific to an operating system |
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| Subsystem: | X11 |
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| Summary: | Use pango to draw UTF-8 text under X11+Xft |
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| Version: | 1.4-feature |
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| Created By: | manolo |
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| Assigned To: | manolo |
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| Fix Version: | 1.4-current (SVN: v12153) |
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| Update Notification: | |
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Trouble Report Files:
Trouble Report Comments:
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| #1 | manolo
23:06 May 30, 2016 |
| I'd like to propose to add the possibility to use the pango
library when drawing text for the X11+Xft platform.
The benefit is that any font can be used to draw any text
(latin, greek, chinese, arabic,...).
Apparently, drawing is very fast.
The attached patch has been tested under Debian, FreeBSD and Darwin.
It is intended as a new option of the porting branch.
For now, only the CMake build system is usable with :
cmake -D OPTION_PANGO=true path-to-source | |
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| #2 | manolo
23:56 Jun 03, 2016 |
| Attached pango2.patch adds some optimization and fixes
drawing of newline-containing strings. | |
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| #3 | manolo
08:55 Jun 05, 2016 |
| To build under Unbuntu, 2 more changes are required,
besides pango2.patch :
1) add these 2 more directories to the dir list at line 358
of file CMake/options.cmake :
/usr/lib/i386-linux-gnu/glib-2.0/include /usr/lib/x86_64-linux-gnu/glib-2.0/include
2) in file src/drivers/xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx,
line 1206, use const void * instead of void * | |
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| #4 | manolo
23:05 Jun 05, 2016 |
| Attached file pango3.patch includes all changes for
building under Ubuntu with
cmake -D OPTION_PANGO=true path-to-source
and works also without OPTION_PANGO | |
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| #5 | manolo
23:28 Jun 10, 2016 |
| Attached file pango5.patch supports CMake-based building
under Debian, Ubuntu, FreeBSD, NetBSD and Darwin.
Also, file src/drivers/Xlib/Fl_Xlib_Graphics_Driver_font_xft.cxx
has been slightly modified and committed to svn (no Pango
support in svn repository yet).
With that, the patch can be applied either with
patch -p0 < pango5.patch
or
svn patch pango5.patch
(Thanks to Albrecht who discovered why patch did not work before) | |
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| #6 | manolo
07:46 Jun 14, 2016 |
| Attached file configure.patch gives pango support for
configure-based build (porting branch always).
It's necessary to apply both pango5.patch and configure.patch.
It's expected to work for Debian, Ubuntu, Darwin, FreeBSD, NetBSD.
Recipe:
./autogen.sh
./configure --enable-pango
make
Under FreeBSD and NetBSD, it's necessary to use gmake instead of make because the construct
CPPFILES += $(shell if test $(BUILD_X11) = Yes;
then echo $(XLIBCPPFILES); fi)
does not work (that is STR#3315).
Advise from configure expert for how to improve the patch
is much welcome. | |
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| #7 | michaelbaeuerle
10:01 Jun 14, 2016 |
| Looks like the glyph composition with pango fails in some cases:
For U+0331 'COMBINING MACRON BELOW' it works. Example:
a̱ e̱
But for U+0332 'COMBINING LOW LINE' it fails. Example:
a̲ e̲ | |
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| #8 | manolo
07:41 Dec 11, 2016 |
| Attached 'word_limit.patch' alows double-click word selection
with non-ASCII, left-to-right text.
Note: text selection remains seriously broken with
right-to-left scripts. | |
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| #9 | AlbrechtS
13:58 Dec 11, 2016 |
| Some comments or suggestions:
pango6.patch:
First I thought OPTION_PANGO should be called OPTION_USE_PANGO for consistency, but then we also have OPTION_CAIRO and some more, so I'm not sure what to suggest.
However, all variables named HAS_* should definitely be renamed to HAVE_*:
- HAS_LIB_GOBJECT
- HAS_LIB_PANGO
- HAS_LIB_PANGOXFT
- HAS_PANGO_H
- HAS_PANGOXFT_H
The point is e.g. selection/groups (search) in cmake-gui. All existing (user defined) variables are called HAVE_*.
word_limit.patch:
+ if (C == 0xA0) return true; // NO-BREAK SPACE
My gut feeling is that NO-BREAK SPACE should NOT be considered a word delimiter, but ... who knows?
Other than that: great, thanks! | |
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| #10 | manolo
07:11 Dec 21, 2016 |
| Pango support for the X11 platform has been committed at r.12153.
It is turned OFF by default.
Turning it ON requires the OPTION_USE_PANGO CMake option, or
the --enable-pango option for configure-based builds.
Word-selection by double-click seems OK also.
Text selection with right-to-left text is miserable. | |
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| #11 | manolo
07:13 Dec 21, 2016 |
| Will close w/resolution if no major problem is discovered. | |
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| #12 | AlbrechtS
11:56 Mar 05, 2017 |
| Shouldn't we close this STR now? | |
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| #13 | manolo
01:27 Mar 06, 2017 |
| Fixed in Subversion repository. | |
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