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Add 0.5px overlap to background rects for sub-pixel gap elimination

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Background rects now extend 0.5px in both width and height to create
a slight overlap, eliminating visible sub-pixel gaps when viewing
SVG screenshots at high zoom levels.
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GitHub Copilot
2026-01-24 19:59:37 +00:00
parent 1f5e5c2c31
commit 3701a3df31
4 changed files with 7 additions and 6 deletions
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tests/test_svg_exporter.py
+3 -3
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@@ -300,15 +300,15 @@ class TestRenderTerminalSvg:
self._char("", bg="red"), # Placeholder inherits bg
]]
svg = render_terminal_svg(buffer, width=80, height=24, char_width=10.0)
# Background should span 2 columns (20px width)
# Background should span 2 columns (20px width + 0.5px overlap)
assert f'fill="{ANSI_COLORS["red"]}"' in svg
# Verify rect width is for 2 columns
# Verify rect width is for 2 columns plus overlap
import re
rect_match = re.search(r'<rect[^>]*width="(\d+\.?\d*)"[^>]*fill="{}"/>'
.format(ANSI_COLORS["red"]), svg)
assert rect_match is not None
width = float(rect_match.group(1))
assert width == 20.0 # 2 columns * 10.0 char_width
assert width == 20.5 # 2 columns * 10.0 char_width + 0.5 overlap
def test_background_same_as_terminal_bg_no_rect(self) -> None:
"""Background same as terminal background doesn't create extra rect."""