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E-book viewer: Make CFI calculation more robust especially on pages with very little content. Fixes #2037454 [E-book viewer: "Back" button doesn't work under some conditions](https://bugs.launchpad.net/calibre/+bug/2037454)

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We were only testing two x values per y value. Instead test all 48.
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Kovid Goyal 2023-09-27 19:54:56 +05:30
parent a3ae1ad46e
commit ff3af3ac15
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1 changed files with 12 additions and 11 deletions
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src/pyj/read_book/paged_mode.pyj
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@ -618,11 +618,12 @@ def current_cfi():
if yb <= top or ya >= bottom:
break
yidx += 1
xidx = 0
ys = v'[ya]' if ya is yb else v'[yb, ya]'
for cury in ys:
xidx = 0
while True:
xb, xa = midx - xidx * deltax, midx + xidx * deltax
if xa <= left or xb >= right:
if xb <= left or xa >= right:
break
xidx += 1
xs = v'[xa]' if xa is xb else v'[xb, xa]'