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TileImages: cache generated sub-images, fixes OS-X performance issue

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This commit is contained in:
Jason Long 2015-01-19 09:21:39 -08:00
parent 71161d650e
commit ef7f14413e
1 changed files with 36 additions and 4 deletions
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40
src/micropolisj/gui/TileImages.java
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@ -180,13 +180,45 @@ public class TileImages
public Image getImage() public Image getImage()
{ {
return image.srcImage.image.getSubimage( return cacheSubImage(image.srcImage.image,
0, image.offsetY, new Rectangle(0, image.offsetY,
TILE_WIDTH, TILE_HEIGHT TILE_WIDTH, TILE_HEIGHT));
);
} }
} }
static class ImageCache extends HashMap<Rectangle,Image>
{
}
IdentityHashMap<BufferedImage, ImageCache> subImageCache = new IdentityHashMap<BufferedImage,ImageCache>();
Image cacheSubImage(BufferedImage bi, Rectangle rect)
{
ImageCache ic = subImageCache.get(bi);
if (ic == null) {
ic = new ImageCache();
subImageCache.put(bi, ic);
}
Image i = ic.get(rect);
if (i == null) {
Image imageRef = bi.getSubimage(
rect.x, rect.y,
rect.width, rect.height);
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice dev = env.getDefaultScreenDevice();
GraphicsConfiguration conf = dev.getDefaultConfiguration();
BufferedImage bi2 = conf.createCompatibleImage(rect.width, rect.height, Transparency.OPAQUE);
Graphics2D gr = bi2.createGraphics();
gr.drawImage(imageRef, 0, 0, null);
i = bi2;
ic.put(rect, i);
}
return i;
}
public ImageInfo getTileImageInfo(int tileNumber) public ImageInfo getTileImageInfo(int tileNumber)
{ {
return getTileImageInfo(tileNumber, 0); return getTileImageInfo(tileNumber, 0);