Enable linear filter when scaling bitmaps

        const float y = (int) floorf(dstTop + mSnapshot->transform->getTranslateY() + 0.5f);

        GLenum filter = GL_NEAREST;

        if (u1 > 0.0f || u2 < 1.0f || v1 > 0.0f || v2 < 1.0f) {

        // Enable linear filtering if the source rectangle is scaled

        if (srcRight - srcLeft != dstRight - dstLeft || srcBottom - srcTop != dstBottom - dstTop) {

            filter = GL_LINEAR;

        }

        texture->setFilter(filter, filter, true);