Add ImageText use_max_line_height()

Tests/fonts/LICENSE.txt

@@ -8,6 +8,7 @@ ArefRuqaa-Regular.ttf, from https://github.com/google/fonts/tree/master/ofl/aref
 ter-x20b.pcf, from http://terminus-font.sourceforge.net/
 BungeeColor-Regular_colr_Windows.ttf, from https://github.com/djrrb/bungee
 OpenSans.woff2, from https://fonts.googleapis.com/css?family=Open+Sans
+GreatVibes-Regular.ttf, from https://fonts.google.com/specimen/Great+Vibes
 
 All of the above fonts are published under the SIL Open Font License (OFL) v1.1 (http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL), which allows you to copy, modify, and redistribute them if you need to.
 

Tests/test_imagetext.py

@@ -1,10 +1,16 @@
 from __future__ import annotations
 
+import sysconfig
+
 import pytest
 
 from PIL import Image, ImageDraw, ImageFont, ImageText, features
 
-from .helper import assert_image_similar_tofile, skip_unless_feature
+from .helper import (
+    assert_image_equal_tofile,
+    assert_image_similar_tofile,
+    skip_unless_feature,
+)
 
 FONT_PATH = "Tests/fonts/FreeMono.ttf"
 
@@ -71,6 +77,21 @@ def test_get_bbox(
     assert ImageText.Text(text, font).get_bbox() == expected
 
 
+def test_use_max_line_height() -> None:
+    font = ImageFont.truetype("Tests/fonts/GreatVibes-Regular.ttf", 120)
+    text = ImageText.Text("adjust\nYellow", font)
+    text.use_max_line_height()
+
+    im = Image.new("RGB", (309, 306))
+    draw = ImageDraw.Draw(im)
+    draw.text((0, 0), text, "#ff0")
+    expected = "Tests/images/use_max_line_height.png"
+    if sysconfig.get_platform() in ("win32", "win-amd64"):
+        assert_image_similar_tofile(im, expected, 12.28)
+    else:
+        assert_image_equal_tofile(im, expected)
+
+
 def test_standard_embedded_color(layout_engine: ImageFont.Layout) -> None:
     if features.check_module("freetype2"):
         font = ImageFont.truetype(FONT_PATH, 40, layout_engine=layout_engine)

src/PIL/ImageText.py

@@ -141,10 +141,24 @@ def __init__(
         self.language = language
 
         self.embedded_color = False
+        self.line_height: float | None = None
 
         self.stroke_width: float = 0
         self.stroke_fill: _Ink | None = None
 
+    def use_max_line_height(self) -> None:
+        """
+        Use the maximum line height from the text.
+        """
+        self.line_height = self.font.getbbox(
+            self.text,
+            self._get_fontmode(),
+            None,
+            self.features,
+            self.language,
+            self.stroke_width,
+        )[3]
+
     def embed_color(self) -> None:
         """
         Use embedded color glyphs (COLR, CBDT, SBIX).
@@ -351,18 +365,18 @@ def _split(
             raise ValueError(msg)
 
         fontmode = self._get_fontmode()
-        line_spacing = (
-            self.font.getbbox(
+        if self.line_height is not None:
+            line_height = self.line_height
+        else:
+            line_height = self.font.getbbox(
                 "A",
                 fontmode,
                 None,
                 self.features,
                 self.language,
                 self.stroke_width,
             )[3]
-            + self.stroke_width
-            + self.spacing
-        )
+        line_spacing = line_height + self.stroke_width + self.spacing
 
         top = xy[1]
         parts = []