Port IMG_Decode (0x4F5F80) and DisplayGfx__Constructor (0x4F5E80) to
pure Rust, eliminating the last transmute bridges in the asset loading
pipeline. img_decode returns Option<DecodedBitGrid> with Display/Collision
discrimination; img_decode_cached always returns *mut DisplayBitGrid.
- Add asset/img.rs with img_decode and img_decode_cached
- Replace transmute bridges in gfx_dir.rs, ddgame_constructor.rs
- Hook IMG_DECODE and IMG_DECODE_CACHED for remaining WA callers
- Type DDGame fields: gradient_image, gradient_image_2, arrow_sprites
as *mut BitGrid instead of *mut u8
- Rename GfxResource__Create_Maybe → IMG__LoadFromDir (Ghidra + Rust)
- Rename DisplayGfx__Constructor_Maybe → IMG__DecodeCached (Ghidra + VA)
- Propagate Option<DecodedBitGrid> through call_gfx_find_and_load
and call_gfx_load_and_wrap
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
refactor: port GfxDir resource loading system to Rust
Port the entire .dir archive I/O layer — GfxDir vtable (read, seek,
load_cached, release), GfxDirStream vtable (all 6 slots), LoadImage,
cache slot management, and cleanup — eliminating all WA.exe asm bridges.
- Move gfx_dir module from render/sprite/ to new asset/ module
- Type cache slots as GfxCacheSlot struct, rename _unknown fields
- Convert GfxDirStreamVtable to #[vtable] macro with bind_! wrappers
- Replace call_gfx_load_dir/call_gfx_load_image bridges with direct calls
- Add WA_FSEEK address, GFX_DIR_STREAM_VTABLE address
- Fix GfxDirStream.gfx_dir field type from *mut u8 to *mut GfxDir
- Rename GfxDirEntry._unknown_08 to data_size
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
refactor: type set_active_layer return + propagate PaletteContext
Cascades a typed `*mut PaletteContext` return through the chain that
starts at `DisplayGfx::set_active_layer` (slot 5) and feeds the GfxDir
loaders.
- Slot 5 vtable signature retyped from `*mut u8` to
`*mut PaletteContext`. Doc-comment promoted from one line to
explain what the result is used for downstream.
- `gfx_resource_create` (`FUN_004F6300` port), `call_gfx_find_and_load`,
and `call_gfx_load_and_wrap` now take `display_ctx: *mut PaletteContext`
instead of `*mut u8`. The single internal `IMG_Decode` call still
casts back to `*mut u8` since `IMG_Decode` is WA-side.
- `compute_complex_gradient` (`render/display/gradient.rs`) takes
`layer3_ctx: *mut PaletteContext` and passes it through to
`call_gfx_find_and_load` without any casts.
- `wa_load_sprites` naked-asm bridge's `_layer_ctx` parameter retyped
to `*mut PaletteContext` to match what its only caller passes after
`set_active_layer`. The naked asm body is unchanged — pointer types
…
refactor: fix DDGameWrapper size to 0x6F10 and remove WABox
DDGameWrapper had an off-by-16 size assertion (0x6F00 vs actual allocation
0x6F10); the 0x20-byte tail is unzeroed unknown padding. Fixed struct field
and size assertion.
WABox never had a Drop implementation so it was purely a leak-by-design
wrapper with no safety value. Remove it entirely and replace all uses:
- WABox::alloc(...).leak() → wa_malloc_struct_zeroed::<T>()
- WABox::from_value(val).leak() → wa_malloc_struct::<T>() + ptr::write(p, val)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
refactor: extract font module, type GfxDir pointers, rename DisplayVtable
Three concurrent cleanups bundled together:
- Extract the font implementation (~830 lines) from display/vtable.rs
into a new display/font.rs module: Font struct (renamed from
FontObject), font_extend, font_set_palette_impl, font_get_info_impl,
font_get_metric_impl, font_set_param_impl, font_load_from_gfx, and
GlyphEntry. vtable.rs is now 870 lines lighter and only contains
vtable definitions and slot wrappers.
- Replace `*mut u8` with typed `*mut GfxDir` across the GfxDir call
graph: LayerSprite.gfx_dir, PCLandscape.{level,water}_gfx_dir,
DDGameWrapper.{primary,secondary}_gfx_dir, slot 31 load_sprite,
slot 34 load_font, slot 37 load_sprite_by_layer,
gfx_dir_find_entry, gfx_resource_create, call_gfx_find_and_load,
call_gfx_load_and_wrap, call_gfx_load_image, plus the matching DLL
trampolines and the inner transmuted vtable[2] cached-load function
pointer in three places. Also renames the misleading local names
`land_layer`/`water_layer` to `land_dir`/`water_d…
refactor: reorganize display/ and render/ into unified render/ module
Merge the display/ and render/ sibling modules into a single render/
module with display/, sprite/, and ddraw/ sub-modules. Pure mechanical
refactor — file moves and import rewrites only, zero logic changes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
