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Re[2]: [Gnash-dev] gnash run slowly on arm w ith agg-renderer

From: Udo Giacomozzi
Subject: Re[2]: [Gnash-dev] gnash run slowly on arm w ith agg-renderer
Date: Tue, 9 Oct 2007 09:57:24 +0200

Changing everything to fixed point is a hard job. We use floating point all 
over the place in Gnash. The rendering engine is just one part of it. 

The AGG library is one of the fastest software rendering libs available. Most 
of the actual rendering is done using fixed point. 

I'm sorry but I don't see a realistic way to optimize Gnash for your CPU.

You have two options:

- use OpenGL rendering (you need appropriate hardware for that and I     don't 
know if matrix transformations are hardware accelerated, but I   think so)

- optimize your movie so that it can be rendered faster (less
  gradients, less vertices, less transparency).

I assume you are using the framebuffer GUI. In case you are using the GTK GUI 
make sure you have the MIT-SHM extension enabled and that Gnash renders in your 
graphics card native color resolution!


Tuesday, October 9, 2007, 9:41:08 AM, you wrote:

l1c> Thanks for your reply!
l1c> My cpu lacks FPU , Now I want to translate all double point
l1c> comput to fixed point arithmatic,but I can't guess the result.
l1c> The format of flash I play on arm board is swf, and it's graphs
l1c> display too slow , may be 50-60times slower than the normally one.
l1c> Would you optimize the software rendering more, or replace agg with 
another graphy libs.
l1c> B Regards
l1c> jeson

l1c> 在2007-10-09,"Udo Giacomozzi" <address@hidden> 写道:
l1c> AGG renders everything in software. It uses fixed point math
l1c> whenever it's possible but obviously there are lots of floating
l1c> point calculations to be done. If your CPU lacks a FPU then this will 
certainly slow rendering.

l1c> I don't know what kind of Flash movie you are trying to play and
l1c> how well it performs on your CPU. We try to optimize software
l1c> rendering but there is no much left that can be done to speed up rendering.

l1c> Udo

l1c> Tuesday, October 9, 2007, 4:10:30 AM, you wrote:

l1c>> I meet some problems when run gnash on arm platform. 

l1c>> Now, the gnash has transplanted to arm board, but when it play, it's 
effeciency is too slow,
l1c>> and the graphs displayed too slowly. I use AGG with renderer, 
l1c>> and I found when deal with vector graphs , it took too many time 

l1c>> to do the work, in agg libs, there are also so many double point 

l1c>> type compute when rastering the graphs. So I want to know how
l1c>> can I resolve the problem I counted.Hope you can give me some 
l1c>> My CPU is ARM926EJ-S, It's main frequency is 266MHz .
l1c>> B Rgards 
l1c>> jeson 

l1c> 你 玩 过 大 富 翁 吗 ?使 用 邮 箱 积 分 兑 换 道 具 ,点 击 这 里 >> 


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