ImageDraw.textbbox doesn't work with the default font

[iguessthislldo]

What did you do?

I tried to use ImageDraw.textbbox without specifying a font.

What did you expect to happen?

I expected ImageDraw.textbbox to work without specifying a font like ImageDraw.text does.

What actually happened?

It throws an AttributeError:

File "<...>/PIL/ImageDraw.py", line 657, in textbbox
    bbox = font.getbbox(
AttributeError: 'ImageFont' object has no attribute 'getbbox'

It also does this when specifying ImageFont.load_default() manually as shown below. It does work when using another font, as shown below in the commented out line.

What are your OS, Python and Pillow versions?

• OS: Ubuntu 18.04
• Python: 3.6.9
• Pillow: 8.2.0

from PIL import Image, ImageDraw, ImageFont
from io import BytesIO

size = (256, 256)

def thumbnail(orig, fmt, text=None):
    if isinstance(orig, bytes):
        orig = BytesIO(orig)
    image = Image.open(orig)
    image.thumbnail(size)
    if text is not None:
        draw = ImageDraw.Draw(image)
        # font = ImageFont.truetype("FreeSans", size=20)
        font = ImageFont.load_default()
        print(draw.textbbox((0, 0), text, font=font))
        draw.text((0, 0), text, font=font)
    result = BytesIO()
    image.save(result, fmt)
    return result.getvalue()

[nulano]

From the docs (emphasis added) https://pillow.readthedocs.io/en/stable/reference/ImageDraw.html#PIL.ImageDraw.ImageDraw.textbbox:

Returns bounding box (in pixels) of given text relative to given anchor when rendered in font with provided direction, features, and language. Only supported for TrueType fonts.

The default ImageDraw font is in PIL font format, not TrueType.

The default font also doesn't support anchors and all glyphs fit within their own bounding box, so textbbox offers no advantages over textsize. (The inverse is not true, textsize is unreliable for TrueType fonts.) As a workaround you can use the following:

if hasattr(font, "getbbox"):
    bbox = draw.textbbox(...)
else:
    w, h = draw.textsize(...)
    bbox = (x, y, x + w, y + h)

[iguessthislldo]

Alright, thanks I missed that it only worked for TrueType fonts. It would be nice if there was a check for that in textbbox so the mistake made was clear.

[radarhere]

I've created #5510 to add a specific error for that.