Files
Sylpheed/docs/re/data/frame-blend-field-hunt.txt
sylph-decoder dad9f2761a re: no per-element field on the disc separates the four too-dark frames
The port measures four elements as rendering too dark against the capture --
ptframe1/2 on the main menu, ptframe3/4 on EXTRAS -- with the shortfall
correlating +0.77/+0.80 with the BACKGROUND and only +0.24 with the element's
own contribution. That is the signature of a blend that scales what is already
there. It asked whether the disc selects one.

Three examples, one negative, wider than the one I gave last iteration:

* frame_alpha_census -- every T8aD sprite on builds 5 and 6 by alpha. It
  REFUTES the port's own sharpener: 'neither frame has a single fully-opaque
  pixel, against ptbase's 99.1 %' is true, and pteff10 (max alpha 130, 100 %
  partial, no opaque pixel) is measured by the port as NEARLY EXACT. So being
  wholly semi-transparent is not what makes the frames special.

* frame_vs_accurate_words -- all 12 T8aD header words for both screens, plus a
  per-BIT sweep of +0x04 and +0x08. NO word and NO bit puts the four frames on
  one side and pteff10 on the other. It also kills my own remaining candidate a
  second time: +0x08 = 0x8050 is shared with pteff21/22/23 on EXTRAS.

* frame_keyframe_unknowns -- the keyframe record's fade, tint, rotation and its
  two unexplained signed words. unknown_4 and unknown_8 are ZERO on every
  keyframe of both screens, so they carry nothing here; no frame takes a value
  of any field that another element does not.

Reach: the 60-byte declaration entry, the T8aD header word-wise and bit-wise,
and the keyframe record. Four elements, two screens. Not the executable's draw
path, which is the next commit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
2026-08-31 05:37:43 +00:00

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# Does ANY per-element field on the disc separate the four too-dark frames from
# the elements the port renders accurately, on the same two screens?
# cargo run -p sylpheed-formats --example frame_vs_accurate_words (SYLPHEED_DISC=/disc)
# and --example frame_keyframe_unknowns
sprite build +0x04 +0x08 +0x1C +0x2C
ptbase.t32 5 00008830 00008000 00000006 00000044
ptbtn01.t32 5 00008130 00008110 00000001 00000030
ptbtn01f.t32 5 00008130 00008112 00000001 00000030
ptbtn02.t32 5 00008130 00008110 00000001 00000030
ptbtn02b.t32 5 00000810 00008110 00000001 00000030
ptbtn02f.t32 5 00008130 00008112 00000001 00000030
ptbtn03.t32 5 00008130 00008110 00000001 00000030
ptbtn03f.t32 5 00008130 00008112 00000001 00000030
ptbtn04.t32 5 00008130 00008110 00000001 00000030
ptbtn04f.t32 5 00008130 00008112 00000001 00000030
ptbtn05.t32 5 00008130 00008110 00000001 00000030
ptbtn05f.t32 5 00008130 00008112 00000001 00000030
ptbtneff01.t32 5 00008130 00008112 00000001 00000030
pteff03.t32 5 00008832 00008010 00000002 00000034
pteff03a.t32 5 00008832 00008010 00000002 00000034
pteff05.t32 5 00008830 00008020 0000000F 00000068
pteff10.t32 5 00008832 00008040 00000002 00000034
pteff12.t32 5 00008832 00008041 00000004 0000003C
ptframe1.t32 5 00008832 00008050 00000002 00000034 <- TOO DARK
ptframe2.t32 5 00008832 00008050 00000004 0000003C <- TOO DARK
ptmsg.t32 5 00008830 00008100 00000001 00000030
ptbase.t32 6 00008830 00008000 00000006 00000044
ptbtn11.t32 6 00008130 00008110 00000001 00000030
ptbtn11f.t32 6 00008130 00008112 00000002 00000034
ptbtn12.t32 6 00008130 00008110 00000001 00000030
ptbtn12f.t32 6 00008130 00008112 00000002 00000034
ptbtn13.t32 6 00008130 00008110 00000001 00000030
ptbtn13f.t32 6 00008130 00008112 00000001 00000030
ptbtneff02.t32 6 00008130 00008112 00000001 00000030
pteff03.t32 6 00008832 00008010 00000002 00000034
pteff03a.t32 6 00008832 00008010 00000002 00000034
pteff05.t32 6 00008830 00008020 0000000F 00000068
pteff10.t32 6 00008832 00008040 00000002 00000034
pteff20.t32 6 00008832 00008041 00000004 0000003C
pteff21.t32 6 00008832 00008050 00000002 00000034
pteff22.t32 6 00008832 00008050 00000002 00000034
pteff23.t32 6 00008832 00008050 00000002 00000034
ptframe3.t32 6 00008832 00008050 00000001 00000030 <- TOO DARK
ptframe4.t32 6 00008832 00008050 00000001 00000030 <- TOO DARK
ptmsg2.t32 6 00008830 00008100 00000002 00000034
pttitle.t32 6 00008830 00008100 00000001 00000030
words where every ptframe* agrees and NO other sprite takes that value:
NONE — no header word separates the four frames from the rest
per-bit check on +0x04 and +0x08 (a bit that is 1 on all frames, 0 on all others):
NONE
=== keyframe record: fade / tint / rotation / the two unexplained words ===
pteff00.prm 6 3 0 0 FF000000 FFFFFFFF 0
frame keyframes: 28 other keyframes: 116
unknown_4 frames take {0} others take 1 distinct values; frame-only values: []
unknown_8 frames take {0} others take 1 distinct values; frame-only values: []
fade frames take {16777215, 2164260863, 3238002687, 4294967295} others take 7 distinct values; frame-only values: []
tint frames take {4294967295} others take 1 distinct values; frame-only values: []
rotation frames take {0} others take 1 distinct values; frame-only values: []