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9a5dfe1415
The previous implementation fell apart quite badly when neither radius value was equal to 0.0. I derived the math from scratch, (much thanks to Vincent Torri <vtorri@univ-evry.fr> for guiding me to a simpler derivation than I was doing originally), and it's working much better now without being any slower, (in fact, cairo-perf shows speedup of 1.05x to 1.58x on my laptop here). This work also provides groundwork for defining the behavior of radial gradients where neither circle is wholly contained within the other, (though we haven't done that definition yet---it will require a new test case and a very little bit of work on the implementation). This is a fix for the following bug report: Radial Gradients with nonzero inner radius misplace stops https://bugs.freedesktop.org/show_bug.cgi?id=7685 |
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| .gitignore | ||
| AUTHORS | ||
| autogen.sh | ||
| ChangeLog | ||
| ChangeLog.libic | ||
| ChangeLog.libpixregion | ||
| ChangeLog.slim | ||
| configure.in | ||
| COPYING | ||
| INSTALL | ||
| libpixman.pc.in | ||
| Makefile.am | ||
| NEWS | ||
| README | ||
| RELEASING | ||
| TODO | ||
| update.pl | ||
libpixman - Pixel manipulation library libpixman is a merge of libpixregion and libic. It also includes the slim headers. ---------------------------------------------------------------------- libpixregion - Pixel region Library libpixregion is a generic library for manipulating pixel regions. A PixRegion is a set of Y-X banded rectangles that cover the desired region. The original code for libxregion was part of the reference X server implementation of the X Window System. A modified copy of the code also exists in the Xlib client library. libpixregion was formed so that both the X server and client libraries could share common code for region manipulation. libpixregion is also intended to be applicable outside of the X Window System. The public interface of libpixregion does not depend on any part of the X Window System. ---------------------------------------------------------------------- libic - Image compositing library libic is a generic image compositing library. libic provides Porter/Duff compositing of images and implicit mask generation for geometric primitives including trapezoids, triangles, and rectangles. The semantics of libic are designed to precisely match the specification of the X Render extension. In fact, the initial implementation of libic was lifted from the reference implementation of RENDER from the X server. However, libic is intended to be useful independent of the X Window System. The public interface exported by libic does not contain any X-specific data structures. Carl Worth cworth@isi.edu Keith Packard (keithp@keithp.com) originally wrote all the original RENDER code that was yanked out to become libic. Keith also provided impetus and guidance in the development of libic. ---------------------------------------------------------------------- slim - Shared Library Interface Macros