Re: Fwd: Re: Marlin-Renderer and JavaFX

[Kevin Rushforth]

Hi Jim,

Thanks for the summary. We should proceed as you outlined. Can you file 
a new RFE (Enhancement) to integrate Marlin into JavaFX as an optional 
rasterizer (disabled by default) so we have a clean JBS issue to use for 
the JDK 9 feature extension request, rather than using JDK-8092373? You 
can assign the RFE to Laurent. It can be linked to the Java2D/Marlin JEP 
and to JDK-8092373.

Laurent: Since there are multiple reasons for submitting the Path2D fix 
as a separate bug fix, please file a new bug for this, linking it to the 
equivalent Java2D bug and also to the new RFE that Jim will file.

Thanks.

-- Kevin


Jim Graham wrote:
There are basically 2 isolated changes to the existing code base and 
then a set of added source files.

The first change is to use Marlin if the appropriate property is 
specified, and those changes are very localized and easy to verify 
that they won't hurt anything.

The second change is to modify the growth pattern of Path2D.  While 
these changes are live in AWT already and have already been code 
reviewed, it would probably be better to submit them as a separate FX 
fix if they are only performance oriented and not strictly required 
for Marlin to function.  That way we compartmentalize anything that 
could possibly result in a regression into a separate bugid so we 
don't have to pull everything if someone complains that the new growth 
pattern is having negative consequences for their app.  I doubt that 
will happen, but it is simple enough to break them into 2 separate 
fixes so it couldn't hurt to do that.

After that, this just boils down to adding a bunch of code that has 
already been vetted elsewhere and a small and simple change to use it 
only optionally and conditionally, which is a very low risk fix.

That would take this change from "no obvious drawbacks" to "obviously 
no drawbacks" (or, more precisely, one "obviously no drawbacks" fix 
and one related "no obvious drawbacks" fix)...

            ...jim

On 11/2/2016 2:54 PM, Laurent Bourgès wrote:
Jim,

Here is an updated patch for MarlinFX:
http://cr.openjdk.java.net/~lbourges/marlinFX/marlinFX-s02-ofx9/

I made big improvements: MarlinFX is now "feature-complete":
- Added MarlinAlphaConsumer & MarlinRenderer interfaces to define new
methods on AlphaConsumer and common methods between AA & noAA renderers
- Renderer: fixed cubic dec/inc lengths (like openpisces) + use 
optimized
copyAlphas from MarlinAlphaConsumer (with block flag optimization 
derived
from former MarlinCache)
- RendererNoAA: optimized Renderer for non-antialiasing (tested OK)
- Dasher & Stroker: backported changes from openpisces (small dash 
phase &
refined cubic / quad mitters)
- Added MarlinPrismUtils & MarlinRasterizer classes to wrap the Marlin
renderer as a JavaFX ShapeRasterizer and implement the 
MarlinAlphaConsumer
efficiently (mimics former MarlinCache ie support the block flag
optimization); MarlinPrismUtils performs properly NaN / Infinity
coordinates filtering and use the same pipeline stages (delta / invDelta
transformers for Dasher/Stroker) like in the MarlinRenderingEngine
- Thread safety: MarlinRasterizer completely thread-safe (for future
multi-threaded rendering) using ReentrantContext...
- Modified (OpenJFX) ShapeUtil to use the MarlinRasterizer instead of 
the
OpenPiscesRasterizer class (use -Dsun.javafx.marlin=true to enable
Marlin-FX)
- Fixed Path2D growing algorithm (like java2d)

So MarlinFX is 13K LOC (few unused classes could be removed soon) and 
only
few lines are added in ShapeUtil to switch MarlinFX ON:

        if (PrismSettings.doNativePisces) {
            shapeRasterizer = new NativePiscesRasterizer();
        } else {






*            // TODO: move that new setting into PrismSettings:
// Enable Marlin-FX by setting -Dsun.javafx.marlin=true            if
(MarlinProperties.isMarlinEnabled()) {
System.out.println("Marlin-FX[" + Version.getVersion() + "]
enabled.");                shapeRasterizer = new
MarlinRasterizer();            } else {*                
shapeRasterizer =
new OpenPiscesRasterizer();

*            }*        }

So the OpenPisces classes are totally left unchanged and MarlinFX is 
just
added as another rasterizer and is enabled with the following settings:
-Dsun.javafx.marlin=true and -Dprism.nativepisces=false

Of course, we could adapt these few lines to satisfy your requirements
(system properties ...); please tell me what you prefer.

I tested this new release with DemoFX, Guimark HTML5, Ensemble8 and
everything is working fine.


Does it look acceptable as a low risk RFE ?

Finally what do you prefer for OpenJDK9 integration ?
- as a new javafx rasterizer (like the provided marlinFX patch)
- or as a javafx wrapper using OpenJDK9's marlin renderer (java2d) ?
I wonder if it would be better to create another JavaFX ShapeRasterizer
that wraps OpenJDK9 Marlin (java2d) to minimize the code duplication 
but it
will add some complexity in the marlin renderer (itself) to introduce 
the
AlphaConsumer interface...


I can make separate patches for all these changes concerning jfx 
Path2D or
Marlin changes for OpenJDK9 first, then MarlinFX.

PS: MarlinFX is based on my (internal) Marlin-renderer 0.7.5 (a bit
different than OpenJDK9's Marlin as it is compatible with jdk 1.8) so I
will synchronize both branches to provide soon MarlinFX9 patches 
closer to
OpenJDK9's Marlin renderer if we are going to work on its integration.

PS2: I will also work on another MarlinFX variant not using Unsafe 
but only
plain arrays to evaluate the performance loss (small) that could 
simplify
the integration with Jigsaw ...

So I made a big step forward, and I am looking forward your feedback,

Cheers,
Laurent