Internal types change

[Pascal C. <pi...@gm...>]

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.

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