ToleranceParams

struct ToleranceParams {
  float Epsilon;
  float CurveTolerance;
  float CollinearityTolerance;
  float IntersectionEpsilon;
  float FillLowerScale;
  float FillUpperScale;
  float FillAliasedLowerScale;
  float FillAliasedUpperScale;
  float StrokeLowerScale;
  float StrokeUpperScale;
  float HintedStrokeLowerScale;
  float HintedStrokeUpperScale;
  float Scale9LowerScale;
  float Scale9UpperScale;
  float EdgeAAScale;
  float MorphTolerance;
  float MinDet3D;
  float MinScale3D;
  unsigned CurveRecursionLimit;
};

Description

ToleranceParams describe the tolerance values which control how smoothly surfaces/shapes/strokes are tessellated for rendering.

The LowerScale and UpperScale indicates the range of scales (lower and upper) that can be reused in cache.

Eg:

if (ShapeScale >= CachedScale * tolerance.FillLowerScale && ShapeScale <= CachedScale * tolerance.FillUpperScale)
    {
        . . . Can use cached mesh
    }

The same is for strokes.

Data Members

Data Member	Description
CollinearityTolerance	Tolerance in screen space, when the curves can be treated as line segments.
CurveRecursionLimit	Tessellation is a recursive process, this is the maximum number of recursions to perform before stopping. This parameter can be used to limit the maximum quality of produced meshes.
CurveTolerance	Curve tolerance in screen space.
EdgeAAScale	Additional EdgeAA scale. Normally it is 1.0, but for more consistent look it should be slightly less than 1.0. This value significantly improves thin vector elements in UI-like applications.
Epsilon	Horizontal and vertical epsilon in screen space.
FillAliasedLowerScale	Scale tolerances for non-EdgeAA.
FillAliasedUpperScale	Scale tolerances for non-EdgeAA.
FillLowerScale	Scale tolerances for EdgeAA.
FillUpperScale	Scale tolerance for EdgeAA.
HintedStrokeLowerScale	Scale tolerances for hinted strokes.
HintedStrokeUpperScale	Scale tolerances for hinted strokes.
IntersectionEpsilon	Epsilon to calculate intersections in screen space.
MinDet3D	Determinant value under which a shape's 3D translation/rotation will be removed.
MinScale3D	Minimum scaling value to clamp to for a shape's 3D matrix.
MorphTolerance	Morphing ratio tolerance. Mostly used to eliminate inequity of floats, when they are essentially equal.
Scale9LowerScale	Scale tolerances for scale9 (better handling in 3D).
Scale9UpperScale	Scale tolerances for scale9 (better handling in 3D).
StrokeLowerScale	Scale tolerances for regular strokes.
StrokeUpperScale	Scale tolerances for regular strokes.

Methods

Method	Description
ToleranceParams	ToleranceParams constructor.

File

Render_ToleranceParams.h