PngOptimizer

A graphics and command line tools to optimize PNGs and convert other lossless formats (GIF, BMP, TGA) into optimized PNGs.

How to build

Linux:

Prerequisites

Install build tools. On Ubuntu, open a terminal then execute: sudo apt install build-essential

For PngOptimizer, install GTK+ 3 development library: sudo apt install libgtk-3-dev

Quick full build and install

This option is only available on Linux. Open a terminal then execute: make sudo make install

These commands build and install both PngOptimizer and PngOptimizerCL in release mode.

Individual builds

Individual builds build in debug mode by default.

1. Open a terminal

2. Change directory to projects/pngoptimizer/

3. Execute command: make or make CONFIG=release

   These commands build in debug and release configuration respectively. The build results are located in the linux-debug/ or linux-release/ directories.

On Linux, make accept other targets: clean, run, install, uninstall, cov. Open sdk/chulib.mk for a description at the top of the file.

For PngOptimizerCL, do the same except that you should change directory to projects/pngoptimizercl instead.

Windows

1. Use Microsoft Visual Studio 2019 and open projects/pngoptimizer/PngOptimizer.sln
2. Build the solution, in either Debug or Release mode, and for Win32 (x86) or x64.

The final build result, PngOptimizer.exe, is located into the Win32-Debug, Win32-Release, x64-Debug or x64-Release sub-directory of the PngOptimizer directory.

For PngOptimizerCL, do the same except that you should change directory to projects/pngoptimizercl instead.

Build directories

The SDK libraries have subdirectories where build files are stored:

• Win32-Debug for the Windows 32-bit debug version
• Win32-Release for the Windows 32-bit release version
• x64-Debug for the Windows 64-bit debug version
• x64-Release for the Windows 64-bit release version
• linux-debug for Linux 64-bit debug version
• linux-release for Linux 64-bit release version

Packaging

To build all and create the packages to be downloaded, call from a terminal:

• On Windows: distrib/make-distrib.bat
• On Linux: distrib/make-distrib.sh

Packages will be created in the distrib/download directory.

On Linux, to build all and install all you can also use the top level Makefile. This is useful when creating a binary Debian package.

License information

• The PngOptimizer application in the "projects" directory is distributed under the terms of the GNU General Public Licence.
• The PngOptimizerCL application in the "projects" directory is distributed under the terms of the GNU General Public Licence.
• The poeng library in the "sdk" directory is distributed under the terms of the GNU Lesser General Public Licence.
• The chuwin32 library in the "sdk" directory is distributed under the terms of the Zlib licence.
• The chustd library in the "sdk" directory is distributed under the terms of the Zlib licence.
• The chustd uses the Zlib library, distributed under the terms of the ZLib licence.
• The unit_tests directory uses the Google Test framework, distributed under the terms of the new BSD license.