Re: Internal types change

[Cort S. <cor...@gm...>]

I don't see a problem with it off hand, without really putting a whole lot
of thought into it.  I do agree with the W3 comment though about getting the
highest precision you can.  I don't think I have come across this one in the
past though, and I push a lot of SVG through the code.  :)
Cort

On Thu, Feb 5, 2009 at 10:26 AM, Pascal Craponne <pi...@gm...> wrote:

> Hi everyone,
> I experienced some problems today, with overflows on floating point
> calculations, with rounding errors, or overflows in GDI rendering.
> The W3 specification says:
> It is recommended that higher precision floating point storage and
> computation be performed on operations such as coordinate system
> transformations to provide the best possible precision and to prevent
> round-off errors.
> Conforming High-Quality SVG Viewers<http://www.w3.org/TR/SVG11/conform.html#ConformingHighQualitySVGViewers> are
> required to use at least double-precision floating point (see [ICC32<http://www.color.org/ICC-1A_1999-04.PDF>])
> for intermediate calculations on certain numerical operations.
> Within the SVG DOM, a <number> is represented as a float or an
> SVGAnimatedNumber<http://www.w3.org/TR/SVG11/types.html#InterfaceSVGAnimatedNumber>
> .
> so even if they speak about float in end, it's all left to user choice
> before.
>
> My suggestion is to:
> - use double in SVG DOM (it also has the effect of speeding up
> computations, since it's the native format)
> - use float in SVG renderer and let the renderer do the conversion by
> itself (and check the overflows there).
>
> Pascal.
>
> jabber/gtalk: pa...@ja...
> msn: pa...@cr...
>
>
>
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