Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/backends/_backend_pdf_ps.py

@@ -0,0 +1,121 @@
+"""
+Common functionality between the PDF and PS backends.
+"""
+
+import functools
+
+import matplotlib as mpl
+from .. import font_manager, ft2font
+from ..afm import AFM
+from ..backend_bases import RendererBase
+
+
+@functools.lru_cache(50)
+def _cached_get_afm_from_fname(fname):
+    with open(fname, "rb") as fh:
+        return AFM(fh)
+
+
+class CharacterTracker:
+    """
+    Helper for font subsetting by the pdf and ps backends.
+
+    Maintains a mapping of font paths to the set of character codepoints that
+    are being used from that font.
+    """
+
+    def __init__(self):
+        self.used = {}
+
+    @mpl.cbook.deprecated("3.3")
+    @property
+    def used_characters(self):
+        d = {}
+        for fname, chars in self.used.items():
+            realpath, stat_key = mpl.cbook.get_realpath_and_stat(fname)
+            d[stat_key] = (realpath, chars)
+        return d
+
+    def track(self, font, s):
+        """Record that string *s* is being typeset using font *font*."""
+        if isinstance(font, str):
+            # Unused, can be removed after removal of track_characters.
+            fname = font
+        else:
+            fname = font.fname
+        self.used.setdefault(fname, set()).update(map(ord, s))
+
+    def merge(self, other):
+        """Update self with a font path to character codepoints."""
+        for fname, charset in other.items():
+            self.used.setdefault(fname, set()).update(charset)
+
+
+class RendererPDFPSBase(RendererBase):
+    # The following attributes must be defined by the subclasses:
+    # - _afm_font_dir
+    # - _use_afm_rc_name
+
+    def __init__(self, width, height):
+        super().__init__()
+        self.width = width
+        self.height = height
+
+    def flipy(self):
+        # docstring inherited
+        return False  # y increases from bottom to top.
+
+    def option_scale_image(self):
+        # docstring inherited
+        return True  # PDF and PS support arbitrary image scaling.
+
+    def option_image_nocomposite(self):
+        # docstring inherited
+        # Decide whether to composite image based on rcParam value.
+        return not mpl.rcParams["image.composite_image"]
+
+    def get_canvas_width_height(self):
+        # docstring inherited
+        return self.width * 72.0, self.height * 72.0
+
+    def get_text_width_height_descent(self, s, prop, ismath):
+        # docstring inherited
+        if ismath == "TeX":
+            texmanager = self.get_texmanager()
+            fontsize = prop.get_size_in_points()
+            w, h, d = texmanager.get_text_width_height_descent(
+                s, fontsize, renderer=self)
+            return w, h, d
+        elif ismath:
+            parse = self.mathtext_parser.parse(s, 72, prop)
+            return parse.width, parse.height, parse.depth
+        elif mpl.rcParams[self._use_afm_rc_name]:
+            font = self._get_font_afm(prop)
+            l, b, w, h, d = font.get_str_bbox_and_descent(s)
+            scale = prop.get_size_in_points() / 1000
+            w *= scale
+            h *= scale
+            d *= scale
+            return w, h, d
+        else:
+            font = self._get_font_ttf(prop)
+            font.set_text(s, 0.0, flags=ft2font.LOAD_NO_HINTING)
+            w, h = font.get_width_height()
+            d = font.get_descent()
+            scale = 1 / 64
+            w *= scale
+            h *= scale
+            d *= scale
+            return w, h, d
+
+    def _get_font_afm(self, prop):
+        fname = font_manager.findfont(
+            prop, fontext="afm", directory=self._afm_font_dir)
+        return _cached_get_afm_from_fname(fname)
+
+    def _get_font_ttf(self, prop):
+        fname = font_manager.findfont(prop)
+        font = font_manager.get_font(fname)
+        font.clear()
+        font.set_size(prop.get_size_in_points(), 72)
+        return font