/**
* Starts a render job with a number of threads equal to the number of available processor cores.
*
* @param factory A {@link WorkerFactory} used to instantiate the workers used to render the
* fractal.
* @param viewport The current viewport settings.
*/
@SuppressWarnings("unchecked")
public Renderer(final WorkerFactory factory, final Viewport viewport) {
this.viewport = viewport;
rows = new Future[viewport.getHeight()];
// Iterate over every row in the fractal
for (int y = 0; y < viewport.getHeight(); y++) {
// Add the worker to the queue
rows[y] = service.submit(factory.create(viewport, y));
}
}
/**
* Draws only the rows that have completely finished rendering to a BufferedImage and returns the
* result without blocking.
*
* @return A BufferedImage containing the fully rendered rows.
*/
public BufferedImage getImage() {
BufferedImage result =
new BufferedImage(viewport.getWidth(), viewport.getHeight(), BufferedImage.TYPE_INT_RGB);
for (int y = 0; y < rows.length; y++) {
// If the row is not finished rendering, skip it
if (!rows[y].isDone()) continue;
MandelbrotWorker.Pixel[] row = null;
try {
row = rows[y].get();
} catch (InterruptedException ex) {
continue;
} catch (ExecutionException ex) {
continue;
}
// Draw each pixel in the current row to the image
for (int x = 0; x < row.length; x++) {
result.setRGB(
x, y, RenderSettings.getInstance().getColourScheme().calculateColour(row[x]).getRGB());
}
}
return result;
}