Tips to Speed up drawImage

Question

My simple array based map game has significant slow down. I profiled it and 85% of my cpu time comes from one line of code. Namely:
g.drawImage(this.img, x * this.w, y * this.w, null);
The img field is a BufferedImage derived from a .png with no alpha channel. The dimensions of the image and the painting area are identical. I'm running linux and when this program is run, xorg consumes 50% of my cpu.
Are there any tips to significantly speed up the painting of image files?

Answer 1

1. Your description is vague. If you are calling this in a loop, call drawImage once, and copyArea to copy it otherwise. You may also want to consider using TexturePaint to do this.
2. Make sure your image's format is compatible with your monitor's configuration:
BufferedImage original = ...
GraphicsConfiguration gc = component.getGraphicsConfiguration();
BufferedImage compat = gc.createCompatibleImage(original.getWidth(), original.getHeight());
Graphics2D g = compat .createGraphics() ;
g.drawRenderedImage(original, null);
g.dispose();Now use compat instead of original.