Method findErrors

MyGUIEngine/src/msdfgen/core/MSDFErrorCorrection.cpp:384–410

template <int N>
void MSDFErrorCorrection::findErrors(const BitmapConstSection<float, N> &sdf) {
    stencil.reorient(sdf.yOrientation);
    // Compute the expected deltas between values of horizontally, vertically, and diagonally adjacent texels.
    double hSpan = minDeviationRatio*transformation.unprojectVector(Vector2(transformation.distanceMapping(DistanceMapping::Delta(1)), 0)).length();
    double vSpan = minDeviationRatio*transformation.unprojectVector(Vector2(0, transformation.distanceMapping(DistanceMapping::Delta(1)))).length();
    double dSpan = minDeviationRatio*transformation.unprojectVector(Vector2(transformation.distanceMapping(DistanceMapping::Delta(1)))).length();
    // Inspect all texels.
    for (int y = 0; y < sdf.height; ++y) {
        for (int x = 0; x < sdf.width; ++x) {
            const float *c = sdf(x, y);
            float cm = median(c[0], c[1], c[2]);
            bool protectedFlag = (*stencil(x, y)&PROTECTED) != 0;
            const float *l = NULL, *b = NULL, *r = NULL, *t = NULL;
            // Mark current texel c with the error flag if an artifact occurs when it's interpolated with any of its 8 neighbors.
            *stencil(x, y) |= (byte) (ERROR*(
                (x > 0 && ((l = sdf(x-1, y)), hasLinearArtifact(BaseArtifactClassifier(hSpan, protectedFlag), cm, c, l))) ||
                (y > 0 && ((b = sdf(x, y-1)), hasLinearArtifact(BaseArtifactClassifier(vSpan, protectedFlag), cm, c, b))) ||
                (x < sdf.width-1 && ((r = sdf(x+1, y)), hasLinearArtifact(BaseArtifactClassifier(hSpan, protectedFlag), cm, c, r))) ||
                (y < sdf.height-1 && ((t = sdf(x, y+1)), hasLinearArtifact(BaseArtifactClassifier(vSpan, protectedFlag), cm, c, t))) ||
                (x > 0 && y > 0 && hasDiagonalArtifact(BaseArtifactClassifier(dSpan, protectedFlag), cm, c, l, b, sdf(x-1, y-1))) ||
                (x < sdf.width-1 && y > 0 && hasDiagonalArtifact(BaseArtifactClassifier(dSpan, protectedFlag), cm, c, r, b, sdf(x+1, y-1))) ||
                (x > 0 && y < sdf.height-1 && hasDiagonalArtifact(BaseArtifactClassifier(dSpan, protectedFlag), cm, c, l, t, sdf(x-1, y+1))) ||
                (x < sdf.width-1 && y < sdf.height-1 && hasDiagonalArtifact(BaseArtifactClassifier(dSpan, protectedFlag), cm, c, r, t, sdf(x+1, y+1)))
            ));
        }
    }
}

template <template <typename> class ContourCombiner, int N>
void MSDFErrorCorrection::findErrors(BitmapConstSection<float, N> sdf, const Shape &shape) {