7c3e063f78
Answers the port's ask about ptframe1/ptframe2, whose residual is uniquely higher on flat pixels than edges and signed one direction -- a body-intensity difference. Prior work covers .prm primitives and a refuted T8aD +0x04 bit; neither covers a .t32 element. All 15 words of the 60-byte declaration entry are read: 3 are the name, 8 constant, the rest kind, focus index, position and pivot. The frames are kind 0, identical to every other plain sprite. One candidate found and refuted by myself: T8aD +0x08 is the only word where both frames agree uniquely on that screen, at 0x8050 -- but 38 sprites carry it disc-wide, only 8 named frame, and the high byte tracks the archive. It is an atlas/format word, not a mode. Also records a false positive of my own test: +0x00 and +0x08 first read as 'separating the frames' because those words are the name string. So any blend the port picks is authored. Reach: not looked at the executable's draw path, where a mode selected in code rather than data would live. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
49 lines
2.4 KiB
Rust
49 lines
2.4 KiB
Rust
//! Does a textured element's declaration carry anything that distinguishes the
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//! two FRAME elements from every other element on the main menu?
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//!
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//! `sylpheed-port` asks for the blend/alpha mode of `ptframe1`/`ptframe2`. Prior
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//! work is on `.prm` PRIMITIVES (`ui-prm-blend-mode.md`, undecodable with reach —
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//! no field, the declaration words are constant) and on a refuted `T8aD +0x04`
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//! bit. Neither covers a `.t32` element's own declaration entry, which is 60
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//! bytes and mostly unread.
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//!
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//! This dumps every declaration entry on the menu and reports, per 4-byte word,
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//! whether the two frames share a value that no other element has. A word that
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//! separates exactly those two is a candidate; one that does not, is not.
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//!
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//! cargo run -p sylpheed-formats --example decl_entry_diff
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use sylpheed_formats::{pak::PakArchive, ui_layout};
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use std::path::PathBuf;
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const AT: usize = 0x20;
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const N: usize = 60;
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fn main() {
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let root = PathBuf::from(std::env::var("SYLPHEED_DISC").expect("SYLPHEED_DISC"));
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let ar = PakArchive::open(root.join("dat/GP_TITLE.pak")).expect("GP_TITLE");
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let by = ar.read(&ar.entries()[5]).expect("entry 5");
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let b = ui_layout::parse_build(&by).expect("build");
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let names: Vec<String> = b.elements.iter().map(|e| e.name.clone()).collect();
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let frames: Vec<usize> = names.iter().enumerate()
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.filter(|(_, n)| n.starts_with("ptframe")).map(|(i, _)| i).collect();
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println!("{} elements; frames at indices {:?}", names.len(), frames);
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let word = |i: usize, w: usize| -> u32 {
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let o = AT + i * N + w * 4;
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u32::from_be_bytes([by[o], by[o + 1], by[o + 2], by[o + 3]])
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};
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println!("\nper-word: does a value separate EXACTLY the two frames?");
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for w in 0..N / 4 {
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let fv: Vec<u32> = frames.iter().map(|&i| word(i, w)).collect();
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let same_in_frames = fv.windows(2).all(|p| p[0] == p[1]);
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let others: Vec<u32> = (0..names.len()).filter(|i| !frames.contains(i))
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.map(|i| word(i, w)).collect();
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let unique = same_in_frames && !others.contains(&fv[0]);
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let distinct = { let mut v: Vec<u32> = (0..names.len()).map(|i| word(i, w)).collect();
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v.sort_unstable(); v.dedup(); v.len() };
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println!(" +0x{:02X} frames {:?} distinct values {distinct:2}{}",
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w * 4, fv.iter().map(|v| format!("{v:08X}")).collect::<Vec<_>>(),
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if unique { " <- SEPARATES THE FRAMES" } else { "" });
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}
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}
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