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* Added SHR pattern * Added IIGS SHR animation test file * Added pattern to readme * Added description and author --------- Co-authored-by: Nik <werwolv98@gmail.com>
189 lines
6.7 KiB
Rust
189 lines
6.7 KiB
Rust
/*!
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Apple IIgs Super Hi-Res (SHR) + PaintWorks Animation (ANI) — ImHex pattern
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Supports:
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• PIC $C1/$0000 — 32 KB uncompressed SHR screen image
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• PIC $C1/$0002 — 3200-color (“Brooks”) per-scanline palettes
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• ANI $C2/$0000 — PaintWorks animation:
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0x0000..0x7FFF : base SHR $C1/$0000 image
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0x8000.. : animation header + chunks
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PaintWorks animation structure (per reversed docs):
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- Base image: uncompressed SHR ($C1/$0000)
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- +0x8000 u32: total animation data length after header (file_len - 0x8008)
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- +0x8004 u16: global frame delay in VBLs
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- +0x8006 u16: flag/? (commonly 0x00C0 or 0x00C1)
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- +0x8008 ...: one or more animation chunks:
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chunk:
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u32 chunk_len (includes this length field)
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repeated { u16 offset; u16 value; } pairs
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offset==0x0000 marks End-of-Frame (value is ignored)
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- Offsets may target any byte in the 32 KB SHR space (pixels, SCBs, palettes).
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This enables palette-cycling and SCB effects.
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References:
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- CiderPress2 PaintWorks Animation notes (file structure, fields, semantics).
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*/
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import std.core;
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import std.sys;
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import std.math;
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#pragma endian little
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#include <std/mem.pat>
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#pragma description Apple IIgs Super Hi-Res (SHR) + PaintWorks Animation (ANI)
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#pragma author hasseily
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// ------------------------------ Constants ------------------------------
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const u32 SHR_ROWS = 200;
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const u32 SHR_BYTES_PER_ROW = 160;
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const u32 SHR_PIXEL_DATA_SIZE = SHR_ROWS * SHR_BYTES_PER_ROW; // 32000 (0x7D00)
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const u32 PIC0000_FILE_SIZE = 0x8000; // 32768
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const u32 PIC0002_FILE_SIZE = 0x9600; // 38400 (32000 + 200*32)
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const u32 PIC0000_OFF_PIXELS = 0x0000;
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const u32 PIC0000_OFF_SCB = 0x7D00;
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const u32 PIC0000_OFF_RESERVED = 0x7DC8;
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const u32 PIC0000_OFF_PALETTES = 0x7E00;
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const u32 PALETTE_COUNT = 16;
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const u32 PALETTE_COLORS = 16;
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const u32 ANI_BASE_SHR_SIZE = 0x8000; // First 32 KB is a $C1/$0000 image
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const u32 ANI_HDR_OFF = 0x8000; // Animation header starts here
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const u32 ANI_MIN_TOTAL_SIZE = 0x8008; // base + header (no chunks)
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// ------------------------------ Types: SHR core ------------------------------
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struct Row160 { u8 data[SHR_BYTES_PER_ROW]; };
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// Scanline Control Byte
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bitfield ShrSCB {
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palette : 4; // 0..15
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reserved : 1;
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color_fill : 1;
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interrupt : 1;
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mode_640 : 1; // 0=320, 1=640
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};
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// helper: expand a 4-bit channel to 8-bit (0x0..0xF -> 0x00..0xFF)
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fn expand4(u8 v) { return (v << 4) | v; };
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bitfield Colors_gb {
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blue : 4; // Blue (B3..B0)
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green : 4; // Green (G3..G0)
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};
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bitfield Colors_r0 {
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red : 4; // Red (R3..R0)
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unused : 4; // Unused / reserved
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};
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// RGB444 stored as 0RGB
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struct Rgb444_0RGB {
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Colors_gb gb;
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Colors_r0 r0;
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} [[color(std::format("{:02X}{:02X}{:02X}", expand4(r0.red), expand4(gb.green), expand4(gb.blue)))]];
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struct Palette16 { Rgb444_0RGB color[PALETTE_COLORS]; };
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// $C1/$0000 raw 32 KB screen dump
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struct SHR_PIC0000 {
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Row160 pixels[SHR_ROWS] @ PIC0000_OFF_PIXELS;
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ShrSCB scb[SHR_ROWS] @ PIC0000_OFF_SCB;
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u8 reserved[56] @ PIC0000_OFF_RESERVED;
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Palette16 palettes[PALETTE_COUNT] @ PIC0000_OFF_PALETTES;
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};
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// “Brooks” 3200-color: pixels + 200 per-line palettes (no SCBs)
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struct BrooksLinePalette { Rgb444_0RGB color[PALETTE_COLORS]; };
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struct SHR_PIC0002 {
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Row160 pixels[SHR_ROWS] @ 0x0000;
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BrooksLinePalette line_palettes[SHR_ROWS] @ SHR_PIXEL_DATA_SIZE; // 0x7D00
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};
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// ------------------------------ Types: PaintWorks ANI ($C2/$0000) ------------------------------
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/* Each operation modifies 1 word at an absolute offset in the 32 KB SHR area.
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End-of-frame marker: offset == 0x0000 (value is ignored). */
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struct AniOp {
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u16 offset [[color("0000AA")]]; // 0x0000..0x7FFE valid; 0x0000 = End-of-Frame
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u16 value [[color("00AAAA")]]; // word to store at [offset]
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// For convenience in the sidebar:
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bool is_eof = (offset == 0x0000);
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};
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// A contiguous animation chunk: length + packed AniOp pairs.
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// Most files have exactly one chunk that spans all frames.
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struct AniChunk {
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u32 chunk_len; // includes this field
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// ops_count = (chunk_len - 4)/4, unless chunk_len == 4
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// in which case: (__file_size - 0x8000 - 12)/4
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u64 ops_count64 =
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(chunk_len == 4)
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? ( (__file_size > (0x8000 + 12)) ? ((__file_size - 0x8000 - 12) / 4) : 0 )
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: ( (chunk_len >= 4) ? (u64(chunk_len - 4) / 4) : 0 );
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u32 ops_count = u32(ops_count64);
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// ops start immediately after chunk_len (offset +4)
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AniOp ops[ops_count];
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};
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// Header located at 0x8000 after the base 32 KB image
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struct AniHeader {
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u32 anim_data_len [[color("660000")]]; // total bytes of animation data after header
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u16 frame_delay_vbl [[color("CC0000")]]; // global per-frame delay in VBLs (NTSC/PAL differ)
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u16 flag_unknown; // usually 0x00C0 or 0x00C1
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};
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// Full PaintWorks animation container
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struct ANI_PaintWorks {
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// Base frame: a normal uncompressed SHR image
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SHR_PIC0000 base @ 0x0000;
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// Global animation header
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AniHeader hdr @ ANI_HDR_OFF;
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// One or more chunks, typically exactly one:
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AniChunk chunks[ std::math::min(
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u32(16), // cap to keep ImHex happy in pathological cases
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u32((__file_size - (ANI_HDR_OFF + sizeof(AniHeader))) > 3 ?
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1 + u32((__file_size - (ANI_HDR_OFF + sizeof(AniHeader))) / 0x10000000) :
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1)
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) ] @ (ANI_HDR_OFF + sizeof(AniHeader));
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// Helpful computed values for inspection:
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u64 file_len = __file_size;
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u64 expected_anim_end = ANI_HDR_OFF + sizeof(AniHeader) + u64(hdr.anim_data_len);
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};
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// ------------------------------ Dispatcher ------------------------------
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u64 __file_size = std::mem::size();
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if (__file_size == PIC0000_FILE_SIZE) {
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// Plain SHR dump
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SHR_PIC0000 pic0000 @ 0x0000;
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} else if (__file_size == PIC0002_FILE_SIZE) {
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// Brooks 3200-color
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SHR_PIC0002 pic0002 @ 0x0000;
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} else if (__file_size >= ANI_MIN_TOTAL_SIZE) {
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// Heuristic: treat as PaintWorks ANI if there’s room for base+header.
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// (Many PW ANI files use ProDOS type $C2/$0000.)
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ANI_PaintWorks ani @ 0x0000;
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} else if (__file_size >= SHR_PIXEL_DATA_SIZE) {
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// Fallback: show pixels only for odd dumps
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Row160 pixels_only[SHR_ROWS] @ 0x0000;
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}
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ANI_PaintWorks ani_paintworks_at_0 @ 0; |