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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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23
src/pyj/read_book/paged_mode.pyj
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@ -618,19 +618,20 @@ def current_cfi():
if yb <= top or ya >= bottom: if yb <= top or ya >= bottom:
break break
yidx += 1 yidx += 1
xidx = 0
ys = v'[ya]' if ya is yb else v'[yb, ya]' ys = v'[ya]' if ya is yb else v'[yb, ya]'
for cury in ys: for cury in ys:
xb, xa = midx - xidx * deltax, midx + xidx * deltax xidx = 0
if xa <= left or xb >= right: while True:
break xb, xa = midx - xidx * deltax, midx + xidx * deltax
xidx += 1 if xb <= left or xa >= right:
xs = v'[xa]' if xa is xb else v'[xb, xa]' break
for curx in xs: xidx += 1
cfi = cfi_at_point(curx, cury) xs = v'[xa]' if xa is xb else v'[xb, xa]'
if cfi: for curx in xs:
# print('Viewport cfi:', cfi) cfi = cfi_at_point(curx, cury)
return cfi if cfi:
# print('Viewport cfi:', cfi)
return cfi
else: else:
try: try:
ans = cfi_at_current() or None ans = cfi_at_current() or None