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restore and document previous getsize behaviour

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see discussion in issue 4789
This commit is contained in:
nulano 2020-07-22 22:07:42 +02:00
parent b3f5c76742
commit aefb04fff0
3 changed files with 28 additions and 8 deletions
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5
Tests/test_imagefont.py
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@ -37,18 +37,21 @@ class TestImageFont:
(">=2.3", "<2.4"): {
"multiline": 30,
"textsize": 12,
"getters": (13, 16),
"multiline-anchor": 6,
"getlength": (36, 27, 27, 33),
},
(">=2.7",): {
"multiline": 6.2,
"textsize": 2.5,
"getters": (12, 16),
"multiline-anchor": 4,
"getlength": (36, 21, 24, 33),
},
"Default": {
"multiline": 0.5,
"textsize": 0.5,
"getters": (12, 16),
"multiline-anchor": 4,
"getlength": (36, 24, 24, 33),
},
@ -624,7 +627,7 @@ class TestImageFont:
assert t.font.glyphs == 4177
assert t.getsize("A") == (12, 16)
assert t.getsize("AB") == (24, 16)
assert t.getsize("M") == (12, 16)
assert t.getsize("M") == self.metrics["getters"]
assert t.getsize("y") == (12, 20)
assert t.getsize("a") == (12, 16)
assert t.getsize_multiline("A") == (12, 16)

9
docs/reference/ImageDraw.rst
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@ -386,6 +386,15 @@ Methods
Return the size of the given string, in pixels.
You can use :meth:`.FreeTypeFont.getlength` to measure text length
with 1/64 pixel precision.
.. note:: For historical reasons this function measures text height from
the ascender line instead of the top, see :ref:`text-anchors`.
If you wish to measure text height from the top, it is recommended
to use :meth:`.FreeTypeFont.getbbox` with `anchor='lt'` instead.
:param text: Text to be measured. If it contains any newline characters,
the text is passed on to :py:meth:`~PIL.ImageDraw.ImageDraw.multiline_textsize`.
:param font: An :py:class:`~PIL.ImageFont.ImageFont` instance.

22
src/PIL/ImageFont.py
View File

@ -217,8 +217,8 @@ class FreeTypeFont:
def getlength(self, text, mode="", direction=None, features=None, language=None):
"""
Returns length (in pixels) of given text if rendered in font with
provided direction, features, and language.
Returns length (in pixels with 1/64 precision) of given text if rendered
in font with provided direction, features, and language.
This is the amount by which following text should be offset.
Text bounding box may extend past the length in some fonts,
@ -275,8 +275,9 @@ class FreeTypeFont:
Returns bounding box (in pixels) of given text relative to given anchor
if rendered in font with provided direction, features, and language.
Use :py:func`getlength()` to get the offset of following text. The bounding
box includes extra margins for some fonts, e.g. italics or accents.
Use :py:meth`getlength()` to get the offset of following text with
1/64 pixel precision. The bounding box includes extra margins for
some fonts, e.g. italics or accents.
:param text: Text to render.
:param mode: Used by some graphics drivers to indicate what mode the
@ -329,8 +330,14 @@ class FreeTypeFont:
Returns width and height (in pixels) of given text if rendered in font with
provided direction, features, and language.
Use :py:func:`getlength()` to measure the offset of following text.
Use :py:func:`getbbox()` to get the exact bounding box based on an anchor.
Use :py:meth:`getlength()` to measure the offset of following text with
1/64 pixel precision.
Use :py:meth:`getbbox()` to get the exact bounding box based on an anchor.
.. note:: For historical reasons this function measures text height from
the ascender line instead of the top, see :ref:`text-anchors`.
If you wish to measure text height from the top, it is recommended
to use :meth:`getbbox` with `anchor='lt'` instead.
:param text: Text to measure.
@ -369,9 +376,10 @@ class FreeTypeFont:
:return: (width, height)
"""
# vertical offset is added for historical reasons, see discussion in #4789
size, offset = self.font.getsize(text, False, direction, features, language)
return (
size[0] + stroke_width * 2 + offset[0],
size[0] + stroke_width * 2,
size[1] + stroke_width * 2 + offset[1],
)