Image cache cleaning about glg2d HOT 4 CLOSED

Possible solution for image update problem:

on GLG2DImageHelper:

void updateImage(Image image, int x, int y, int width, int height, Color bgColor, Buffer buffer);

on AbstractImageHelper:

public void updateImage(Image image, int x, int y, int width, int height, Color bgColor, Buffer buffer) {
        Texture texture = cache.get(image);
        if (texture != null) {
            begin(texture, null, bgColor);
            g2d.getGLContext().getGL().glTexSubImage2D(GL.GL_TEXTURE_2D, 0, 0, 0, image.getWidth(null), image.getHeight(null), GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, buffer);
            drawImage(image, x, y, width, height, bgColor, null);
            end(texture);
        }
    }

The code is compatible with GL2 and ES2 (glTexSubImage2D),
I use for video update on textures..

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My custom WeakHashMap is a holdover from when I had some additional
functionality, I think I can expunge it.

There are two reasons I've stuck with clearing the cache on every paint.

• an Image may not have all its data at the time of painting in which
  case we want to paint with new data the next time
• an application may be painting custom Images then discarding them, in
  which case we don't want to cache longer than we have to

But I do like your idea of using a RenderingHint to enable developers to
keep the cache from being cleared after each draw. Another option might be
a multi-level cache, where Images that do have all the data are kept across
draws and the cache has some maximum size.

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Is a big problem a new texture generation for every video frame :(

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I fixed this with 831147a. The new default cache policy is to never clear the cache. You can control this with the new GLG2DRenderingHints class. So if you draw the same icon each frame, it won't generate a new texture each time.

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