清除透明的BufferedImage尽可能快 [英] Clear a transparent BufferedImage as fast as possible

问题描述

我有以下code（不相关的它是如何创建的，我认为）创建了一个透明的BufferedImage：

I have a transparent BufferedImage created with the following code(not relevant how it is created, I think):

            GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();

            Rectangle screen = transformationContext.getScreen();

            // Create an image that supports transparent pixels
            return gc.createCompatibleImage((int) screen.getWidth(), (int) screen.getHeight(),
                    Transparency.BITMASK);

我如何清除图像（在相同的状态空图像，因为它创建）最快可能的方式不重新创建的形象呢？重塑形象穿GC的负担，暂停虚拟机并冻结UI。

How do I clear the image(empty image in the same state as it was created) in the fastest way possible without recreating the image? Recreating the image puts a burden on GC, pausing the VM and freezing the UI.

推荐答案

明白了:)使用clearRect代替填充透明色。

Got it :) used clearRect instead of fill with a transparent color.

            graphics = (Graphics2D) offlineBuffer.getGraphics();
            graphics.setBackground(new Color(255, 255, 255, 0));
            Rectangle screen = transformationContext.getScreen();
            graphics.clearRect(0,0, (int)screen.getWidth(), (int)screen.getHeight());

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