0f795e6625
Images are converted to ARGB32 format, then each byte (ie: each pixel channel) in the read image is allowed to deviate by some specified amount from the corresponding byte in the expected image, to allow for rounding errors etc. By default, no deviation is permitted, but the XCF tests are allowed a deviation of 1, as the alpha blending can result in rounding errors (depending on whether hardware acceleration is used, for example). In the end, we are not too concerned about a small deviation that is invisible to the human eye. REVIEW: 116567
KImageFormats
Image format plugins for Qt
Introduction
This framework provides additional image format plugins for QtGui. As such it is not required for the compilation of any other software, but may be a runtime requirement for Qt-based software to support certain image formats.
Formats
The following image formats have read-only support:
- DirectDraw Surface (dds)
- Gimp (xcf)
- OpenEXR (exr)
- Photoshop documents (psd)
- Sun Raster (ras)
The following image formats have read and write support:
- Encapsulated PostScript (eps)
- JPEG-2000 (jp2)
- Personal Computer Exchange (pcx)
- SGI images (rgb, rgba, sgi, bw)
- Softimage PIC (pic)
- Targa (tga): supports more formats than Qt's version
- XView (xv)
Contributing
See the QImageIOPlugin documentation for information on how to write a new plugin.
The main difference between this framework and the qimageformats module of Qt is the license. As such, if you write an imageformat plugin and you are willing to sign the Qt Project contributor agreement, it may be better to submit the plugin directly to the Qt Project.
Note that the imageformat plugins provided by this module also provide a desktop file. This is for the benefit of KImageIO in the KDE4 Support framework.
Duplicated Plugins
The TGA plugin supports more formats than Qt's own TGA plugin; specifically, the one provided here supports indexed, greyscale and RLE images (types 1-3 and 9-11), while Qt's plugin only supports type 2 (RGB) files.
The code for this cannot be contributed upstream directly because of licensing. If anyone were willing to write fresh code to improve Qt's TGA plugin, it would allow the TGA plugin in this framework to be removed.
License
This framework is licensed under the LGPLv2.1.
The CMake code in this framework is licensed under the BSD license.
Links
- Home page: https://projects.kde.org/projects/frameworks/kimageformats
- Mailing list: https://mail.kde.org/mailman/listinfo/kde-frameworks-devel
- IRC channel: #kde-devel on Freenode
- Git repository: https://projects.kde.org/projects/frameworks/kimageformats/repository