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fix drawing text alpha on RGBA image on big-endian platforms

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Nulano 2023-11-27 16:42:45 +01:00
parent f3b3442c50
commit 0cef9f251c
3 changed files with 4 additions and 2 deletions
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Tests/images/bitmap_font_blend.png
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2
Tests/test_imagefont.py
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@ -862,7 +862,7 @@ def test_bitmap_blend(layout_engine, embedded_color):
"Tests/fonts/EBDTTestFont.ttf", size=64, layout_engine=layout_engine "Tests/fonts/EBDTTestFont.ttf", size=64, layout_engine=layout_engine
) )
im = Image.new("RGB", (128, 96), "white") im = Image.new("RGBA", (128, 96), "white")
d = ImageDraw.Draw(im) d = ImageDraw.Draw(im)
d.text((16, 16), "AA", font=font, embedded_color=embedded_color, fill="#8E2F52") d.text((16, 16), "AA", font=font, embedded_color=embedded_color, fill="#8E2F52")

4
src/PIL/ImageDraw.py
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@ -32,6 +32,7 @@
import math import math
import numbers import numbers
import struct
from . import Image, ImageColor from . import Image, ImageColor
@ -542,7 +543,8 @@ class ImageDraw:
# font.getmask2(mode="RGBA") returns color in RGB bands and mask in A # font.getmask2(mode="RGBA") returns color in RGB bands and mask in A
# extract mask and set text alpha # extract mask and set text alpha
color, mask = mask, mask.getband(3) color, mask = mask, mask.getband(3)
color.fillband(3, (ink >> 24) & 0xFF) ink_alpha = struct.pack("=i", ink)[3]
color.fillband(3, ink_alpha)
x, y = coord x, y = coord
self.im.paste(color, (x, y, x + mask.size[0], y + mask.size[1]), mask) self.im.paste(color, (x, y, x + mask.size[0], y + mask.size[1]), mask)
else: else: