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Java game programming: image rendering hints make no difference to rendering time


I am writing an Open Source/Free Software Java desktop game (Rabbit Escape) and am experimenting with allowing you to zoom in so that the images being rendered are fairly big, and I'm seeing some slow-down.


[Note: Rabbit Escape is also available on Android, where it appears to have no problems with rendering speed...]


Rabbit Escape

Rabbit Escape


To speed it up, I have been experimenting with passing various values to Graphics2D 's setRenderingHint method.


My conclusion is that on my platform (OpenJDK Java 7 on Linux) it makes no difference whatsoever. Please leave a comment if I'm doing it wrong.


I am timing how long each frame takes to render, and comparing the time when I insert this code before my rendering code:


Graphics2D

setRenderingHint


// As slow and high-quality as possible, please!
g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
g.setRenderingHint( RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY );
g.setRenderingHint( RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY );
g.setRenderingHint( RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY );

with inserting this before my rendering code:


// As fast and low-quality as possible, please!
g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF );
g.setRenderingHint( RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_SPEED );
g.setRenderingHint( RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_SPEED );
g.setRenderingHint( RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED );

[Documentation, such as it is, is here: RenderingHints.]


RenderingHints


I see no appreciable difference in rendering time or image quality between these two setups, or when I leave out the calls to setRenderingHint completely.


Platform details:


$ java -version
java version "1.7.0_75"
OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~trusty1)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)

Originally posted at 2015-04-06 21:50:39+00:00. Automatically generated from the original post : apologies for the errors introduced.


original post

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