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Implement a consistent behavior in TkAgg backend for bad blit bbox by richardsheridan · Pull Request #20887 · matplotlib/matplotlib · GitHub

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Implement a consistent behavior in TkAgg backend for bad blit bbox #20887

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Merged
tacaswell merged 1 commit into from
Jan 26, 2022
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Implement a consistent behavior in TkAgg backend for bad blit bbox #20887

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4 changes: 4 additions & 0 deletions lib/matplotlib/backends/_backend_tk.py
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,8 @@ def blit(photoimage, aggimage, offsets, bbox=None):

If *bbox* is passed, it defines the region that gets blitted. That region
will be composed with the previous data according to the alpha channel.
Blitting will be clipped to pixels inside the canvas, including silently
doing nothing if the *bbox* region is entirely outside the canvas.

Tcl events must be dispatched to trigger a blit from a non-Tcl thread.
"""
Expand All @@ -92,6 +94,8 @@ def blit(photoimage, aggimage, offsets, bbox=None):
x2 = min(math.ceil(x2), width)
y1 = max(math.floor(y1), 0)
y2 = min(math.ceil(y2), height)
if (x1 > x2) or (y1 > y2):
return
bboxptr = (x1, x2, y1, y2)
comp_rule = TK_PHOTO_COMPOSITE_OVERLAY
else:
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