uint8_t* op = other->data()[0] + oy * other->stride()[0];
for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
float const alpha = float (op[3]) / 255;
tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;
uint8_t* op = other->data()[0] + oy * other->stride()[0];
for (int tx = start_tx, ox = start_ox; tx < size().width && ox < other->size().width; ++tx, ++ox) {
float const alpha = float (op[3]) / 255;
tp[0] = (tp[0] * (1 - alpha)) + op[0] * alpha;
tp[1] = (tp[1] * (1 - alpha)) + op[1] * alpha;
tp[2] = (tp[2] * (1 - alpha)) + op[2] * alpha;