public Layer(Layer rgb, Channel a) {
this.r = rgb.r;
this.g = rgb.g;
this.b = rgb.b;
this.width = r.getWidth();
this.height = r.getHeight();
this.a = a;
}
public Layer place(Layer sprite, int x_offset, int y_offset)
{
r.place(sprite.r, x_offset, y_offset);
g.place(sprite.g, x_offset, y_offset);
b.place(sprite.b, x_offset, y_offset);
if (a != null && sprite.a != null)
a.place(sprite.a, x_offset, y_offset);
return this;
}
public Layer layerSubtract(Layer layer)
{
r.channelSubtract(layer.r);
g.channelSubtract(layer.g);
b.channelSubtract(layer.b);
return this;
}
public Layer layerMultiply(Layer layer)
{
r.channelMultiply(layer.r);
g.channelMultiply(layer.g);
b.channelMultiply(layer.b);
return this;
}
public Layer layerDifference(Layer layer)
{
r.channelDifference(layer.r);
g.channelDifference(layer.g);
b.channelDifference(layer.b);
return this;
}
public Layer layerDarkest(Layer layer)
{
r.channelDarkest(layer.r);
g.channelDarkest(layer.g);
b.channelDarkest(layer.b);
return this;
}
public Layer layerBrightest(Layer layer)
{
r.channelBrightest(layer.r);
g.channelBrightest(layer.g);
b.channelBrightest(layer.b);
return this;
}
public Layer layerBlend(Layer layer)
{
if(!(layer.a != null))
throw new Exception("cannot blend RGB only layer");
if (a == null) {
r.channelBlend(layer.r, layer.a);
g.channelBlend(layer.g, layer.a);
b.channelBlend(layer.b, layer.a);
} else {
float alpha;
float alpha_inv;
float r1;
float g1;
float b1;
float a2;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (a.getPixel(x, y) == 0) {
putPixel(x, y, layer.r.getPixel(x, y), layer.g.getPixel(x, y), layer.b.getPixel(x, y), layer.a.getPixel(x, y));
} else if (layer.a.getPixel(x, y) == 0) {
continue;
} else {
alpha = 1f - (1f - a.getPixel(x, y))*(1f - layer.a.getPixel(x, y));
alpha_inv = 1f/alpha;
r1 = r.getPixel(x, y);
g1 = g.getPixel(x, y);
b1 = b.getPixel(x, y);
a2 = layer.a.getPixel(x, y);
r.putPixel(x, y, r1 - r1*a2*alpha_inv + layer.r.getPixel(x, y)*a2*alpha_inv);
g.putPixel(x, y, g1 - g1*a2*alpha_inv + layer.g.getPixel(x, y)*a2*alpha_inv);
b.putPixel(x, y, b1 - b1*a2*alpha_inv + layer.b.getPixel(x, y)*a2*alpha_inv);
a.putPixel(x, y, alpha);
}
}
}
}
return this;
}
public Layer layerBlend(Layer rgb, Channel a)
{
return layerBlend(new Layer(rgb.r, rgb.g, rgb.b, a));
}
public Layer layerBlend(Layer layer, float alpha)
{
r.channelBlend(layer.r, alpha);
g.channelBlend(layer.g, alpha);
b.channelBlend(layer.b, alpha);
return this;
}
public Layer layerAverage(Layer layer)
{
r.channelAverage(layer.r);
g.channelAverage(layer.g);
b.channelAverage(layer.b);
return this;
}
public Layer layerAdd(Layer layer)
{
r.channelAdd(layer.r);
g.channelAdd(layer.g);
b.channelAdd(layer.b);
return this;
}
