feat(print): Windows Native Raw Print Spooler (GDI/ICM Bypass) (#26) #29

2026-08-23T11:34:08+01:00

gronod commented

2026-08-23 11:34:08 +01:00

Summary

Resolves #26 (Sub-Task 1 of Milestone 6: Native Raw OS Printing Engine #25).

Implements the Windows native raw printing spooler backend within the Tauri Rust core to bypass Windows GDI Image Color Management (ICM) and print unmanaged profiling targets directly to inkjet and raster printers.

Changes

Modular Printing Backend (src-tauri/src/print/):
- mod.rs: Platform abstraction with non-Windows stubs.
- windows.rs:
  - get_printers: Native printer enumeration using EnumPrintersW (Level 4 with Level 2 fallback).
  - print_target:
    - TIFF loading and conversion into an uncompressed 24-bit BGR DIB buffer with 4-byte row stride alignment.
    - Printer handle management via OpenPrinterW and DEVMODEW manipulation (dmICMMethod = DMICMMETHOD_NONE).
    - Device context creation (CreateDCW) and GDI color management bypass (SetICMMode(hdc, ICM_OFF)).
    - Bitmap drawing to device context via StretchDIBits and GDI document lifecycle APIs (StartDocW, StartPage, EndPage, EndDoc).
Tauri Commands & Registration (src-tauri/src/commands.rs & src-tauri/src/lib.rs):
- Added and registered get_windows_printers and print_target_windows.
Dependencies (src-tauri/Cargo.toml):
- Added image crate (v0.25) with TIFF decoding.
- Added windows crate (v0.58) under target.'cfg(windows)'.dependencies.

Testing & Verification

cargo check: Clean compilation on Linux.
cargo test: All 8 unit tests passed.

## Summary Resolves #26 (Sub-Task 1 of Milestone 6: Native Raw OS Printing Engine #25). Implements the Windows native raw printing spooler backend within the Tauri Rust core to bypass Windows GDI Image Color Management (ICM) and print unmanaged profiling targets directly to inkjet and raster printers. ### Changes - **Modular Printing Backend (`src-tauri/src/print/`)**: - `mod.rs`: Platform abstraction with non-Windows stubs. - `windows.rs`: - `get_printers`: Native printer enumeration using `EnumPrintersW` (Level 4 with Level 2 fallback). - `print_target`: - TIFF loading and conversion into an uncompressed 24-bit BGR DIB buffer with 4-byte row stride alignment. - Printer handle management via `OpenPrinterW` and `DEVMODEW` manipulation (`dmICMMethod = DMICMMETHOD_NONE`). - Device context creation (`CreateDCW`) and GDI color management bypass (`SetICMMode(hdc, ICM_OFF)`). - Bitmap drawing to device context via `StretchDIBits` and GDI document lifecycle APIs (`StartDocW`, `StartPage`, `EndPage`, `EndDoc`). - **Tauri Commands & Registration (`src-tauri/src/commands.rs` & `src-tauri/src/lib.rs`)**: - Added and registered `get_windows_printers` and `print_target_windows`. - **Dependencies (`src-tauri/Cargo.toml`)**: - Added `image` crate (v0.25) with TIFF decoding. - Added `windows` crate (v0.58) under `target.'cfg(windows)'.dependencies`. ### Testing & Verification - `cargo check`: Clean compilation on Linux. - `cargo test`: All 8 unit tests passed.

gronod added 1 commit 2026-08-23 11:34:09 +01:00

feat(print): implement Windows native raw print spooler and printer enumeration (#26 )

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