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Fixes https://github.com/flutter/flutter/issues/152780 Fixes https://github.com/flutter/flutter/issues/152794 Problems: * If point scale is < 1, we discarded it too early by computing circle divisions with the rounded scale. Since we multiply the scale by the transform _after_ rounding, we may end up generating too many points in some circumstances. * Tessellator used max basis XYZ instead of max basis XY. The latter will never allow scaling factors less than 1 as Flutter canvas scale does not impact Z, only transform layers do. * Computation of max basis required squaring the scaling factor, which would cause us to hit float::inf too early. For translate scale just take the max of m[0] and m[5]. * Draw points minimum circumference is 1, so the min radius should be 0.5