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The RenderingOptimization
class allows settings to be made which affect the way web pages
are rendered. These can be used to modify the speed and detail of
the rendering.
Smooth Scrolling
Since
the WebRenderer Swing Edition uses Java to perform the rendering
of web pages, some pages can appear slow to scroll when there is
Flash or other plugins present on the page. There are a few options
which can be used to improve the page scrolling in these cases.
By setting a smooth scrolling option, pulgins or Flash will not
be rendered while the page is being scrolled. This only applies
to scrolling from the scrollbar, not other forms such as mousewheel
or cursor keys.
These smooth scrolling options are not used
by default. They can be set by using the following functions:
RenderingOptimization.setSmoothPluginScrolling(boolean
smoothPluginScrolling);
RenderingOptimization.setWindowlessFlashSmoothScrolling(boolean
windowlessFlashSmoothScrolling);
Anti-aliasing
Options
are available to use anti-aliasing in the rendering of web pages.
There are seperate options for graphics and text. The anti-aliasing
is not enabled by default for general rendering and can be set using
the following function:
RenderingOptimization.setAntiAliasing(boolean
antiAlias);
The anti-aliasing for text has three different
settings.
TEXT_ANTIALIAS_OFF -
No anti-aliasing is used on text.
TEXT_ANTIALIAS_AUTO -
Anti-aliasing is only used on text of a certain point size and above.
This makes large fonts appear smoother and small fonts easy to read.
The font point size is that used in java.awt.Font, which is measured
in pixels, or 1/72 inch units. This threshold is set to 14
point by default.
TEXT_ANTIALIAS_ALL -
Anti-aliasing is used on all text.
This is set by using the
following function:
RenderingOptimization.setTextAntiAliasing(int
textAntiAliasing);
Note: By default this is set to
TEXT_ANTIALIAS_ALL on Mac OSX and TEXT_ANTIALIAS_AUTO on all other
systems.
If the TEXT_ANTIALIAS_AUTO option is used,
the threshold size can be changed from the default value of 14 to
the required value using the following function:
RenderingOptimization.setAntiAliasTextAutoThreshold(int
antiAliasTextAutoThreshold);
Example usage:
IMozillaBrowserCanvas
browser = new IMozillaBrowserCanvas();
...
RenderingOptimization
renOps = new RenderingOptimization();
renOps.setSmoothPluginScrolling(true);
renOps.setWindowlessFlashSmoothScrolling(true);
renOps.setAntiAliasing(true);
renOps.setAntiAliasTextAutoThreshold(12);
browser.setRenderingOptimizations(renOps);
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