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Re: [Gnash-dev] Optimization to jpeg decoding

From: Benjamin Wolsey
Subject: Re: [Gnash-dev] Optimization to jpeg decoding
Date: Thu, 27 Nov 2008 08:25:00 +0100

Am Mittwoch, den 26.11.2008, 20:32 -0500 schrieb dolphinling:
> Hitachi's animation The Hard Drive is the New Bling (Bling_Final.swf, 
> available 
> from e.g. plays slowly in gnash. It 
> contains a small number of very large jpegs (up to 3422x2516 px), and a 
> profile 
> shows that there are over 8 million calls to JpegImageInput::getWidth, nearly 
> 2% 
> of the total cpu time (in a debug build with video and audio output disabled).
> All but 32 of those 8 million calls are from ImageInput::readSWFJpeg3. This 
> patch simply stores the result of getWidth within readSWFJpeg3.
Thanks, that's definitely better. I'll make the changes you suggest
manually. Most of the actual image handling has been essentially
untouched for years, so there is certainly potential for more


The current release of Gnash is 0.8.4

Benjamin Wolsey, Software Developer -

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