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SkijaGraphics2D

Version 1.0.4, 23 January 2022

Overview

SkijaGraphics2D is an implementation of Java2D's Graphics2D API that targets Skia via the Skija bindings. The project is exploratory at the moment, but potential uses for this are:

  • to provide a path for Java applications to access the Skia rendering engine, perhaps providing speed and/or quality gains compared to Java2D as well as access to target formats supported by Skia (for example, SVG and PDF)
  • to include libraries such as JFreeChart and Orson Charts in Jetpack Compose Desktop applications (but see issue #7).

Note that these are potential uses, so far I haven't tried those things out...if you have then let me know what worked and what didn't work.

Testing

SkijaGraphics2D is being tested using Graphics2D Tester and produces the output shown below and now matches Java2D quite closely:

SkijaGraphics2D test output

Include

To include SkijaGraphics2D in your own project, add the following Maven dependency:

    <dependency>
        <groupId>org.jfree</groupId>
        <artifactId>org.jfree.skijagraphics2d</artifactId>
        <version>1.0.4</version>
    </dependency>

Build

You can build SkijaGraphics2D from sources using Maven:

mvn clean install

History

Version 1.0.4 : 23-Jan-2022
Version 1.0.3 : 7-Aug-2021
  • handle Ellipse2D directly in draw(Shape) and fill(Shape)
  • map focus point correctly for RadialGradientPaint
  • add default font mappings for Java logical fonts
  • get font metrics from Skija (not Java2D)
  • fix bug in setColor(Color) method where Skija paint not set
  • fix clipping issues
Version 1.0.2 : 4-Aug-2021
  • fix setClip() to restore original clip before applying new user clip
  • set PathFillMode when filling paths
  • add MIN_LINE_WIDTH to apply for BasicStroke(0f)
  • fix exception when Rectangle2D has negative width or height
Version 1.0.1 : 27-Jul-2021
  • added specialisation in fill(Shape) for Rectangle2D instances
  • added caching of Typeface instances
  • fix paint setting for font rendering
  • added support for AlphaComposite
  • apply clipping (still work-in-progress)
  • fix for cyclic gradient paint
  • updated Skija to version 0.92.18
  • added logging via SLF4J and Log4J2
Version 1.0.0 : 21-Jul-2021
  • initial public release.

License

SkijaGraphics2D is licensed under a BSD-style license:

Copyright (c) 2021, by David Gilbert.

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, 
this list of conditions and the following disclaimer in the documentation 
and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors 
may be used to endorse or promote products derived from this software without 
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.