ToBounds() [1/2]

Transform16 fl::Transform16::ToBounds ( alpha16 max_value )

static

Definition at line 44 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_value) {
        // numerator = max_value * 2^16
        uint32_t numer = static_cast<uint32_t>(max_value) << 16;
        // denom = 0xFFFF; use ceil so 0xFFFF→max_value exactly:
        uint32_t scale32 = numer / 0xFFFF;
        scale16 = static_cast<alpha16>(scale32);
    }
    tx.scale_x = scale16;
    tx.scale_y = scale16;
    tx.offset_x = 0;
    tx.offset_y = 0;
    tx.rotation = 0;
    return tx;
}

References Transform16(), offset_x, offset_y, rotation, scale16(), scale_x, and scale_y.

Referenced by From().

Here is the call graph for this function:

Here is the caller graph for this function: