LibTiff6 for Delphi

A modernized Delphi wrapper for LibTiff 4.7.1, specifically refactored for x64 compatibility, BigTIFF support, and Unicode-safe string handling.

Overview

This project is an updated version of the classic LibTiff Delphi headers. It has been overhauled to work seamlessly with modern Delphi versions (tested on XE7) and provides a stable interface for both 32-bit and 64-bit Windows applications.

Key Improvements

• Full 64-bit Support: All internal types (THandle, NativeInt, UInt64) have been corrected to match the x64 ABI.
• BigTIFF Ready: Replaced legacy 32-bit file pointers with SetFilePointerEx, enabling support for TIFF files larger than 4GB.
• Safety Checks: Added explicit checks for Windows API limits (e.g., 32-bit DWORD limits in ReadFile/WriteFile) to prevent data corruption.
• Unicode Compatibility: Correct mapping of PAnsiChar for library calls, ensuring stability in Unicode Delphi environments.
• Clean Implementation: Removed obsolete .obj linking and legacy 16/32-bit hacks.

Precompiled Binaries

The repository includes libtiff.dll (v4.7.1) for both x86 and x64 architectures. These were compiled using the MinGW-w64 environment and are standalone (no external dependencies).

Built-in support for the following codecs:

• libdeflate: High-performance DEFLATE compression.
• liblzma: LZMA (7z) compression.
• zlib: Standard ZIP/Deflate compression.
• jpeg-10: JPEG-in-TIFF support.

Requirements

• Delphi
• libtiff.dll (Included in the /Bin folder).

Usage

Simply include the unit in your project:

uses
  LibTiff6;

License

This project is licensed under the Mozilla Public License (MPL) 2.0.

Credits

Based on the original work by:

• Vampyre Imaging Library - v0.26.4 - 2009.10.11 - (https://github.com/galfar/imaginglib)
• Do-wan Kim - LibTiffDelphi v3.9.4.00

Updated and maintained by bigmike & Gemini (Google AI).