Dec 28
Libcairo supports several output file formats (PNG, PDF, SVG) and PNG as input format. But often it is necessary to read and write JPG files as well. Libjpeg-turbo does all the JPEG stuff. All you have to do is to combine this with the Cairographics library. I implemented two functions in this small C source …
Dec 11
This article explains how to calculate the control points for B-Splines. The basic idea is that we want to interpolate a smooth curve into a set of points. B-Splines are a sequence of Bezier curves which solve that problem. But each Bezier curve is defined by four points: the start and end point and two …
Nov 02
This article explains how to open an X11 window using Xlib and shows how to create graphics output with Cairo graphics. Cairo Graphics — also simply called libcairo — is a very powerful 2D graphics library. Among many graphics primitives (such as lines, curves,…) the approach of libcairo is to separate the graphic functions from …
Aug 06
This article is about a tool which creates electronic documents with a real handwritten-like font (download link). Sometimes it is desirable to use a font which looks similar to a handwritten text. Those fonts typically are called script fonts and a quick Google search results in several million hits. Although many of them look as …
Feb 11
About one month of intensive work and it is done! Smrender now uses libcairo as a graphics library for rendering instead of libgd. The major advantages of this change are qualitiy improvement of the output images, performance improvement, and the ability to create native vector-based PDF documents. It was a long outstanding task for me …