Use Manimpango

docker/Dockerfile

@@ -26,9 +26,6 @@ COPY . /opt/manim
 WORKDIR /opt/manim
 RUN pip install --no-cache .
 
-# ensure that ffi bindings are generated
-RUN python -c "import pangocairocffi"
-
 # create working directory for user to mount local directory into
 WORKDIR /manim
 RUN chmod 666 /manim

docs/source/installation/mac.rst

@@ -15,16 +15,6 @@ To install cairo:
 
    brew install cairo
 
-To install Pango and it dependencies:
-
-.. code-block:: bash
-
-   brew install pkg-config
-   brew install libffi
-   brew install pango
-   brew install glib
-
-
 To install ffmpeg:
 
 .. code-block:: bash

docs/source/installation/troubleshooting.rst

@@ -3,30 +3,28 @@ Troubleshooting
 
 List of known installation problems.
 
-(Windows) OSError: dlopen() failed to load a library: pango?
-------------------------------------------------------------
-
-If your manual installation of Manim (or even the installation using
-Chocolatey) fails with the error
+``pip install manim`` fails when installing manimpango?
+-------------------------------------------------------
+Most likely this means that pip was not able to use our pre-built wheels
+of ``manimpango``. Let us know (via our `Discord <https://discord.gg/mMRrZQW>`_
+or by opening a
+`new issue on GitHub <https://github.com/ManimCommunity/ManimPango/issues/new>`_)
+which architecture you would like to see supported, and we'll see what we
+can do about it.
+
+To fix errors when installing ``manimpango``, you need to make sure you
+have all the necessary build requirements. Check out the detailed
+instructions given in
+`the BUILDING section <https://github.com/ManimCommunity/ManimPango#BUILDING>`_
+of the corresponding `GitHub repository <https://github.com/ManimCommunity/ManimPango>`_.
 
-.. code-block::
 
-  OSError: dlopen() failed to load a library: pango / pango-1 / pango-1.0 / pango-1.0-0
-
-possibly combined with alerts warning about procedure entry points
-``"deflateSetHeader"`` and ``"inflateReset2"`` that could not be
-located, you might run into an issue with a patched version of ``zlib1.dll``
-shipped by Intel, `as described here <https://github.com/msys2/MINGW-packages/issues/813>`_.
+(Windows) OSError: dlopen() failed to load a library: pango?
+------------------------------------------------------------
 
-To resolve this issue, you can copy ``zlib1.dll`` from the directory
-provided for the Pango binaries to the directory Manim is installed to.
+This should be fixed in Manim's latest version, update
+using ``pip install --upgrade manim``.
 
-For a more global solution (try at your own risk!), try renaming the
-file ``zlib1.dll`` located at ``C:\Program Files\Intel\Wifi\bin`` to
-something like ``zlib1.dll.bak`` -- and then try installing Manim again
-(either using ``pip install manim`` or with Chocolatey). Ensure that
-you are able to revert this name change in case you run into troubles
-with your WiFi (we did not get any reports about such a problem, however).
 
 
 Some letters are missing from TextMobject/TexMobject output?

docs/source/installation/win.rst

@@ -18,32 +18,6 @@ You can install manim very easily using chocolatey, by typing the following comm
 And then you can skip all the other steps and move to installing :ref:`latex-installation`.
 Please see :doc:`troubleshooting` section for details about OSError.
 
-Pango Installation
-******************
-
-These steps would get you `libpango-1.0-0.dll` to your ``PATH`` along
-with other dependencies. You may probably have them before itself if
-you have installed `GTK <https://www.gtk.org/>`_ or any ``GTK``
-based app like emacs. If you have it you can just add it to your
-path and skip these steps.
-
-1. Go to `Release Page
-   <https://github.com/ManimCommunity/manim-windows/releases/latest>`_
-   and download the one according to your PC architechture.
-
-   .. important:: Please download the ``zip`` file for architechture of python installed.
-                  It is possible to have installed ``x86`` python installed on ``x64`` PC.
-
-2. Extract the zip file using File Explorer or 7z to the loaction you want to install.
-
-   .. code-block:: bash
-
-      7z x pango-windows-binaires-x64.zip -oC:\Pango
-
-3. Finally, add it `PATH variable
-   <https://www.computerhope.com/issues/ch000549.htm>`_.
-
-
 FFmpeg installation
 *******************
 

manim/mobject/svg/text_mobject.py

@@ -53,18 +53,15 @@ def construct(self):
 from xml.sax.saxutils import escape
 
 import cairo
-import cairocffi
-import pangocairocffi
-import pangocffi
+import manimpango
+from manimpango import PangoUtils, TextSetting, MarkupUtils
 
 from ... import config, logger
 from ...constants import *
 from ...mobject.geometry import Dot
 from ...mobject.svg.svg_mobject import SVGMobject
 from ...mobject.types.vectorized_mobject import VGroup
-from ...utils.color import WHITE
-from ...utils.color import Colors
-
+from ...utils.color import WHITE, Colors
 
 TEXT_MOB_SCALE_FACTOR = 0.05
 
@@ -103,68 +100,6 @@ def remove_invisible_chars(mobject):
     return mobject_without_dots
 
 
-class PangoUtils:
-    @staticmethod
-    def str2style(string: str) -> pangocffi.Style:
-        """Internally used function. Converts text to Pango Understandable Styles."""
-        if string == NORMAL:
-            return pangocffi.Style.NORMAL
-        elif string == ITALIC:
-            return pangocffi.Style.ITALIC
-        elif string == OBLIQUE:
-            return pangocffi.Style.OBLIQUE
-        else:
-            raise AttributeError("There is no Style Called %s" % string)
-
-    @staticmethod
-    def str2weight(string: str) -> pangocffi.Weight:
-        """Internally used function. Convert text to Pango Understandable Weight"""
-        if string == NORMAL:
-            return pangocffi.Weight.NORMAL
-        elif string == BOLD:
-            return pangocffi.Weight.BOLD
-        elif string == THIN:
-            return pangocffi.Weight.THIN
-        elif string == ULTRALIGHT:
-            return pangocffi.Weight.ULTRALIGHT
-        elif string == LIGHT:
-            return pangocffi.Weight.LIGHT
-        elif string == SEMILIGHT:
-            return pangocffi.Weight.SEMILIGHT
-        elif string == BOOK:
-            return pangocffi.Weight.BOOK
-        elif string == MEDIUM:
-            return pangocffi.Weight.MEDIUM
-        elif string == SEMIBOLD:
-            return pangocffi.Weight.SEMIBOLD
-        elif string == ULTRABOLD:
-            return pangocffi.Weight.ULTRABOLD
-        elif string == HEAVY:
-            return pangocffi.Weight.HEAVY
-        elif string == ULTRAHEAVY:
-            return pangocffi.Weight.ULTRAHEAVY
-        else:
-            raise AttributeError("There is no Font Weight Called %s" % string)
-
-    @staticmethod
-    def remove_last_M(file_name: str) -> None:
-        with open(file_name, "r") as fpr:
-            content = fpr.read()
-        content = re.sub(r'Z M [^A-Za-z]*? "\/>', 'Z "/>', content)
-        with open(file_name, "w") as fpw:
-            fpw.write(content)
-
-
-class TextSetting(object):
-    def __init__(self, start, end, font, slant, weight, line_num=-1):
-        self.start = start
-        self.end = end
-        self.font = font
-        self.slant = slant
-        self.weight = weight
-        self.line_num = line_num
-
-
 class CairoText(SVGMobject):
     """Display (non-LaTeX) text.
 
@@ -448,7 +383,7 @@ def text2svg(self):
         offset_x = 0
         last_line_num = 0
         for setting in settings:
-            font = setting.font
+            font = setting.font.decode("utf-8")
             slant = self.str2slant(setting.slant)
             weight = self.str2weight(setting.weight)
             text = self.text[setting.start : setting.end].replace("\n", " ")
@@ -1012,45 +947,22 @@ def text2svg(self):
         file_name = os.path.join(dir_name, hash_name) + ".svg"
         if os.path.exists(file_name):
             return file_name
-        surface = cairocffi.SVGSurface(file_name, 600, 400)
-        context = cairocffi.Context(surface)
-        context.move_to(START_X, START_Y)
         settings = self.text2settings()
-        offset_x = 0
-        last_line_num = 0
-        layout = pangocairocffi.create_layout(context)
-        layout.set_width(pangocffi.units_from_double(600))
-        for setting in settings:
-            family = setting.font
-            style = PangoUtils.str2style(setting.slant)
-            weight = PangoUtils.str2weight(setting.weight)
-            text = self.text[setting.start : setting.end].replace("\n", " ")
-            fontdesc = pangocffi.FontDescription()
-            fontdesc.set_size(pangocffi.units_from_double(size))
-            if family:
-                fontdesc.set_family(family)
-            fontdesc.set_style(style)
-            fontdesc.set_weight(weight)
-            layout.set_font_description(fontdesc)
-            if setting.line_num != last_line_num:
-                offset_x = 0
-                last_line_num = setting.line_num
-            context.move_to(
-                START_X + offset_x, START_Y + line_spacing * setting.line_num
-            )
-            pangocairocffi.update_layout(context, layout)
-            if disable_liga:
-                text = escape(text)
-                layout.set_markup(
-                    f"<span font_features='liga=0,dlig=0,clig=0,hlig=0'>{text}</span>"
-                )
-            else:
-                layout.set_text(text)
-            logger.debug(f"Setting Text {text}")
-            pangocairocffi.show_layout(context, layout)
-            offset_x += pangocffi.units_to_double(layout.get_size()[0])
-        surface.finish()
-        return file_name
+        width = 600
+        height = 400
+
+        return manimpango.text2svg(
+            settings,
+            size,
+            line_spacing,
+            disable_liga,
+            file_name,
+            START_X,
+            START_Y,
+            width,
+            height,
+            self.text,
+        )
 
 
 class MarkupText(SVGMobject):
@@ -1360,32 +1272,22 @@ def text2svg(self):
         file_name = os.path.join(dir_name, hash_name) + ".svg"
         if os.path.exists(file_name):
             return file_name
-        surface = cairocffi.SVGSurface(file_name, 600, 400)
-        context = cairocffi.Context(surface)
-        context.move_to(START_X, START_Y)
-        layout = pangocairocffi.create_layout(context)
-        layout.set_width(pangocffi.units_from_double(600))
-
-        fontdesc = pangocffi.FontDescription()
-        fontdesc.set_size(pangocffi.units_from_double(size))
-        if self.font:
-            fontdesc.set_family(self.font)
-        fontdesc.set_style(PangoUtils.str2style(self.slant))
-        fontdesc.set_weight(PangoUtils.str2weight(self.weight))
-        layout.set_font_description(fontdesc)
 
-        context.move_to(START_X, START_Y)
-        pangocairocffi.update_layout(context, layout)
-        if disable_liga:
-            layout.set_markup(
-                f"<span font_features='liga=0,dlig=0,clig=0,hlig=0'>{self.text}</span>"
-            )
-        else:
-            layout.set_markup(self.text)
         logger.debug(f"Setting Text {self.text}")
-        pangocairocffi.show_layout(context, layout)
-        surface.finish()
-        return file_name
+        return MarkupUtils.text2svg(
+            self.text,
+            self.font,
+            self.slant,
+            self.weight,
+            size,
+            line_spacing,
+            disable_liga,
+            file_name,
+            START_X,
+            START_Y,
+            600,  # width
+            400,  # height
+        )
 
     def _count_real_chars(self, s):
         """Counts characters that will be displayed.