1.5beta1 drawLine accelerated, drawPoly not?!?!

Java 2D
#1

While answering another persons question regarding the poor performance of drawPolygon in 1.4.x, I tested 1.5neta1 to see if it was going to fix the problem.
I expected to find 1.5 HW accelerating polygon drawing, but it appears it doesn’t, which sucks :frowning:

However what realy suprised me was that drawLine calls are accelerated, yet drawPolygon calls arn’t :-/

I can see the reason for this if the 2 are handled differently in native code, however, would an intermediary implementation of drawPolygon which used HW accelerated drawLine() not be a good idea?

I would imagine it is trivial to implement, and would greatly improve drawPolygon performance until a proper implementation can be done.

#2

Without hijacking your thread, how can you tell if something is accel or not? Is there a list?

#3

Just simple performance comparison.

1.4.2_03 I can render ~2000 lines @ 30fps.
1.5beta1 I can render ~5200 lines @ 30fps.

#4

The 1.5 performance improvement in rendering lines is likely because of batching of Direct3D primitives (non h/v lines are rendered via d3d).

DrawPoly is rendered using GDI’s :: Polyline. GDI rendering is typically accelerated when rendering to the screen, but I guess not so for offscreen images…