Merge "Fixing a bad bug when there is no real umbra"

    Vector2 penumbra[k];

    int penumbraLength = hull(shadowRegion, shadowRegionLength, penumbra);

    // no real umbra make a fake one

    Vector2 fakeUmbra[polyLength];

    if (umbraLength < 3) {

        // The shadow from the centroid of the light polygon.

        Vector2 centShadow[polyLength];

        // If there is no real umbra, make a fake one.

        for (int i = 0; i < polyLength; i++) {

            float t = lightCenter.z - poly[i].z;

            if (t == 0) {

            float x = lightCenter.x - t * (lightCenter.x - poly[i].x);

            float y = lightCenter.y - t * (lightCenter.y - poly[i].y);

            centShadow[i].x = x;

            centShadow[i].y = y;

            fakeUmbra[i].x = x;

            fakeUmbra[i].y = y;

        }

        // Shrink the centroid's shadow by 10%.

        // TODO: Study the magic number of 10%.

        Vector2 shadowCentroid = centroid2d(centShadow, polyLength);

        Vector2 shadowCentroid = centroid2d(fakeUmbra, polyLength);

        for (int i = 0; i < polyLength; i++) {

            centShadow[i] = shadowCentroid * (1.0f - SHADOW_SHRINK_SCALE) +

                    centShadow[i] * SHADOW_SHRINK_SCALE;

            fakeUmbra[i] = shadowCentroid * (1.0f - SHADOW_SHRINK_SCALE) +

                    fakeUmbra[i] * SHADOW_SHRINK_SCALE;

        }

#if DEBUG_SHADOW

        ALOGD("No real umbra make a fake one, centroid2d =  %f , %f",

                shadowCentroid.x, shadowCentroid.y);

#endif

        // Set the fake umbra, whose size is the same as the original polygon.

        umbra = centShadow;

        umbra = fakeUmbra;

        umbraLength = polyLength;

    }