Geminus gains accelerated JPEG supportBy Chris Williams. Published: 24th Mar 2006, 13:58:23 | Permalink | Printable
Three times faster than RISC OS 5, says LeesRendering JPEGs up to three times faster than RISC OS 5 can manage, Adrian Lees's project to overhaul the handling of JPEG images is now available. His update to Geminus means images passed to the operating system by application software are intercepted by Geminus. The speed at which these images are handled is then accelerated, and programs such as Draw can be used to scale and rotate the JPEGs. The software is compatible with Iyonix, RiscPC and A9home computers.
Publisher Neil Spellings said: "We see this release as being of great benefit to users who work with images from digital cameras, as JPEG is the preferred format in this area."
Aemulor and Geminus author Adrian said: "The main reason for developing this is that I've always been frustrated by how slowly RISC OS's SpriteExtend decodes and renders large JPEGs.
"If you have large images from digital cameras and you view them in applications like Thump, Paint, Draw, SwiftJPEG, or use them as backdrops then you'll know that it takes many seconds for a full screen JPEG to render. In fact it spends so long decoding and rendering the JPEG that audio playback will cease with apps like DigitalCD because of the way the OS is structured."
Adrian explained that when his JPEG handling code is used, the sound system and other components such as ShareFS will continue to work rather than stalling if the image decoding consumes too much processor time.
He said: "Decoding and rendering is about three times faster than the RISC OS 5 SpriteExtend module. It's also faster than the RISC OS 4, Select and Adjust SpriteExtend module but the difference is not as great because these versions already have faster JPEG decoding."
The enhanced JPEG handling was first previewed in February at the South West show. Open source graphics applications OpenVector, OpenGridPro and DrawPlus have also been updated by Adrian to make use of the JPEG acceleration and also use RISC OS Select's Image File Convert plugins.
Spellings Software website
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