private void renderBlend(Surface input1, Surface input2, Surface output) {
if (output.hasAlpha()) {
output.process(new Blit().setBlendMode(BlendMode.Add).setOpacity(1 - mix), input1);
output.process(new Blit().setBlendMode(BlendMode.Add).setOpacity(mix), input2);
input1.release();
} else {
output.copy(input1);
input1.release();
output.process(new Blit().setBlendMode(BlendMode.Normal).setOpacity(mix), input2);
}
input2.release();
}
private void drawSingle(Surface input, Surface output) {
if (mix == 0.0) {
output.copy(input);
} else if (mix == 1.0) {
output.clear();
} else {
output.process(new Blit().setBlendMode(BlendMode.Normal).setOpacity(1 - mix), input);
}
input.release();
}
private void drawComposite(Surface input1, Surface input2, Surface output) {
if (mix == 0.0) {
output.process(Blit.op(), input1);
} else if (mix == 1.0) {
output.process(Blit.op(), input2);
} else {
switch (mode) {
case Add:
renderAdd(input1, input2, output);
break;
case Difference:
renderDifference(input1, input2, output);
break;
case BitXor:
renderBitXor(input1, input2, output);
break;
default:
renderBlend(input1, input2, output);
}
}
}
private void renderDifference(Surface input1, Surface input2, Surface output) {
double alpha;
Surface src;
Surface dst;
if (mix >= 0.5) {
alpha = (1.0 - mix) * 2;
src = input1;
dst = input2;
} else {
alpha = mix * 2;
src = input2;
dst = input1;
}
output.copy(dst);
dst.release();
output.process(new Blit().setBlendMode(BlendMode.Difference).setOpacity(alpha), src);
src.release();
}