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Fit to contents when image size omitted

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Eliminates the assumption of any specific metrics from the pen. It still
gives some image without giving any parameters, thus it should be a good
starting point for new users.
This commit is contained in:
Takaaki Fuji 2022-01-11 23:00:38 +09:00
parent e3bbf39a28
commit 072b4c8db0
2 changed files with 53 additions and 22 deletions
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55
Lib/fontTools/pens/freetypePen.py
View File

@ -148,12 +148,14 @@ class FreeTypePen(BasePen):
(ctypes.c_int)(flags)
)
def buffer(self, width=1000, height=1000, transform=None, contain=False, evenOdd=False):
def buffer(self, width=None, height=None, transform=None, contain=False, evenOdd=False):
"""Renders the current contours within a bitmap buffer.
Args:
width: Image width of the bitmap in pixels.
height: Image height of the bitmap in pixels.
width: Image width of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
height: Image height of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
transform: A optional 6-tuple containing an affine transformation,
or a ``Transform`` object from the ``fontTools.misc.transform``
module. The bitmap size is not affected by this matrix.
@ -166,7 +168,7 @@ class FreeTypePen(BasePen):
A tuple of ``(buffer, size)``, where ``buffer`` is a ``bytes``
object of the resulted bitmap and ``size` is a 2-tuple of its
dimension.
:Example:
>> pen = FreeTypePen(None)
>> glyph.draw(pen)
@ -177,15 +179,20 @@ class FreeTypePen(BasePen):
transform = transform or Transform()
if not hasattr(transform, 'transformPoint'):
transform = Transform(*transform)
if contain:
contain_x, contain_y = contain or width is None, contain or height is None
width, height = width or 0, height or 0
if contain_x or contain_y:
bbox = self.bbox
bbox = transform.transformPoints((bbox[0:2], bbox[2:4]))
bbox = (*bbox[0], *bbox[1])
bbox_size = bbox[2] - bbox[0], bbox[3] - bbox[1]
dx = min(-transform.dx, bbox[0]) * -1.0
dy = min(-transform.dy, bbox[1]) * -1.0
width = max(width, bbox_size[0])
height = max(height, bbox_size[1])
dx, dy = transform.dx, transform.dy
if contain_x:
dx = min(-dx, bbox[0]) * -1.0
width = max(width, bbox_size[0])
if contain_y:
dy = min(-dy, bbox[1]) * -1.0
height = max(height, bbox_size[1])
transform = Transform(*transform[:4], dx, dy)
width, height = math.ceil(width), math.ceil(height)
buf = ctypes.create_string_buffer(width * height)
@ -205,12 +212,14 @@ class FreeTypePen(BasePen):
raise FT_Exception(err)
return buf.raw, (width, height)
def array(self, width=1000, height=1000, transform=None, contain=False, evenOdd=False):
def array(self, width=None, height=None, transform=None, contain=False, evenOdd=False):
"""Returns the rendered contours as a numpy array. Requires `numpy`.
Args:
width: Image width of the bitmap in pixels.
height: Image height of the bitmap in pixels.
width: Image width of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
height: Image height of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
transform: A optional 6-tuple containing an affine transformation,
or a ``Transform`` object from the ``fontTools.misc.transform``
module. The bitmap size is not affected by this matrix.
@ -222,7 +231,7 @@ class FreeTypePen(BasePen):
Returns:
A ``numpy.ndarray`` object with a shape of ``(height, width)``.
Each element takes a value in the range of ``[0.0, 1.0]``.
:Example:
>> pen = FreeTypePen(None)
>> glyph.draw(pen)
@ -234,13 +243,15 @@ class FreeTypePen(BasePen):
buf, size = self.buffer(width=width, height=height, transform=transform, contain=contain, evenOdd=evenOdd)
return np.frombuffer(buf, 'B').reshape((size[1], size[0])) / 255.0
def show(self, width=1000, height=1000, transform=None, contain=False, evenOdd=False):
def show(self, width=None, height=None, transform=None, contain=False, evenOdd=False):
"""Plots the rendered contours with `pyplot`. Requires `numpy` and
`matplotlib`.
Args:
width: Image width of the bitmap in pixels.
height: Image height of the bitmap in pixels.
width: Image width of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
height: Image height of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
transform: A optional 6-tuple containing an affine transformation,
or a ``Transform`` object from the ``fontTools.misc.transform``
module. The bitmap size is not affected by this matrix.
@ -248,7 +259,7 @@ class FreeTypePen(BasePen):
so that it fits to the bounding box of the paths. Useful for
rendering glyphs with negative sidebearings without clipping.
evenOdd: Pass ``True`` for even-odd fill instead of non-zero.
:Example:
>> pen = FreeTypePen(None)
>> glyph.draw(pen)
@ -259,13 +270,15 @@ class FreeTypePen(BasePen):
plt.imshow(a, cmap='gray_r', vmin=0, vmax=1)
plt.show()
def image(self, width=1000, height=1000, transform=None, contain=False, evenOdd=False):
def image(self, width=None, height=None, transform=None, contain=False, evenOdd=False):
"""Returns the rendered contours as a PIL image. Requires `Pillow`.
Can be used to display a glyph image in Jupyter Notebook.
Args:
width: Image width of the bitmap in pixels.
height: Image height of the bitmap in pixels.
width: Image width of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
height: Image height of the bitmap in pixels. If omitted, it
automatically fits to the bounding box of the contours.
transform: A optional 6-tuple containing an affine transformation,
or a ``Transform`` object from the ``fontTools.misc.transform``
module. The bitmap size is not affected by this matrix.
@ -277,7 +290,7 @@ class FreeTypePen(BasePen):
Returns:
A ``PIL.image`` object. The image is filled in black with alpha
channel obtained from the rendered bitmap.
:Example:
>> pen = FreeTypePen(None)
>> glyph.draw(pen)

20
Tests/pens/freetypePen_test.py
View File

@ -6,7 +6,7 @@ try:
except ImportError:
FREETYPE_PY_AVAILABLE = False
from fontTools.misc.transform import Scale
from fontTools.misc.transform import Scale, Offset
def draw_cubic(pen):
pen.moveTo((50, 0))
@ -127,6 +127,24 @@ class FreeTypePenTest(unittest.TestCase):
self.assertEqual(len(buf1), len(buf2))
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_none_width(self):
pen = FreeTypePen(None)
star(pen)
width, height = None, 1000
buf1, size = pen.buffer(width=width, height=height, transform=Offset(0, 200))
buf2, _ = pen.buffer(width=1000, height=height, transform=Offset(0, 200))
self.assertEqual(size, (1000, 1000))
self.assertEqual(buf1, buf2)
def test_none_height(self):
pen = FreeTypePen(None)
star(pen)
width, height = 1000, None
buf1, size = pen.buffer(width=width, height=height)
buf2, _ = pen.buffer(width=width, height=1000, transform=Offset(0, 200))
self.assertEqual(size, (1000, 1000))
self.assertEqual(buf1, buf2)
if __name__ == '__main__':
import sys
sys.exit(unittest.main())