ToBounds() [2/2]

Transform16 fl::Transform16::ToBounds ( const vec2< alpha16 > & min, const vec2< alpha16 > & max, alpha16 rotation = 0 )

static

Definition at line 64 of file transform.cpp.

                                                                              {
    Transform16 tx;
    // Compute a Q16 “scale” so that:
    //    (alpha16 * scale) >> 16  == max_value  when alpha16==0xFFFF
    alpha16 scale16 = 0;
    if (max.x > min.x) {
        // numerator = max_value * 2^16
        uint32_t numer = static_cast<uint32_t>(max.x - min.x) << 16;
        // denom = 0xFFFF; use ceil so 0xFFFF→max_value exactly:
        uint32_t scale32 = numer / 0xFFFF;
        scale16 = static_cast<alpha16>(scale32);
    }
    tx.scale_x = scale16;
    if (max.y > min.y) {
        // numerator = max_value * 2^16
        uint32_t numer = static_cast<uint32_t>(max.y - min.y) << 16;
        // denom = 0xFFFF; use ceil so 0xFFFF→max_value exactly:
        uint32_t scale32 = numer / 0xFFFF;
        scale16 = static_cast<alpha16>(scale32);
    }
    tx.scale_y = scale16;
    tx.offset_x = min.x;
    tx.offset_y = min.y;
    tx.rotation = rotation;
    return tx;
}

References Transform16(), offset_x, offset_y, rotation, scale16(), scale_x, scale_y, fl::vec2< T >::x, and fl::vec2< T >::y.

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