JAI 图像调整瓶颈
我正在使用 JAI 库对一系列图像进行调整，每个图像的大小约为 1300x1000。我使用“Rescale”调整像素强度，并使用 TiledImage.createGraphics() 方法中的 Graphics2D 对象添加文本和线条。然后，我使用“subsampleaverage”调整图像大小以适合屏幕，并使用 Graphics2D.drawRenderedImage() 渲染到屏幕。到目前为止，几乎没有任何放缓，渲染大约需要 40-60 毫秒。
但是，如果我只添加文本和线条，显示速度会减慢至 100-200 毫秒。我似乎无法弄清楚这是为什么，因为在调整像素强度之后或之前添加文本就可以了。
我一直在该网站上搜索，但似乎找不到任何具体答案。许多建议都是使用 BufferedImages，但从 PlanarImages 转换为 BufferedImages 似乎也存在速度减慢的问题。
I'm using the JAI library to do adjustments on a series of images, each about 1300x1000 in size. I adjust pixel intensities with "Rescale" and add text and lines with the Graphics2D object from the TiledImage.createGraphics() method. Then I resize the image to fit the screen with "subsampleaverage" and render to screen with Graphics2D.drawRenderedImage(). Up to this point, there is little slowdown, with rendering taking about 40-60 milliseconds.
However, if I only add the text and lines, the display slows down to 100-200 milliseconds. I can't seem to figure out why this is, as adding the text after or before adjust pixel intensities is fine.
I've been searching through the site, but I can't seem to find any concrete answer. Many suggestions have been to use BufferedImages, but converting from PlanarImages to BufferedImages seems to also have a slowdown issue.
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显然，Java 中文本的渲染速度仍然非常慢。每个
Font对象的字形必须在Graphics对象上渲染和绘制。由于对象上有大量文本，Font对象以及所有使用的Glyphs都会被重新创建，从而导致速度大幅下降。即使使用 JOGL，速度也会显着下降。但使用相同的
TextRenderer对象可以通过创建单个Font对象并在TextRenderer处于活动状态时重复使用它来缓解这种情况。当然，这限制了您使用多个 Font 对象，因为 JOGL 尚未实现setFont函数，需要您为每个新字体、font 创建一个新的TextRenderer对象样式和字体粗细。希望这对遇到类似问题的人有所帮助。
Apparently text is still rendered very slowly in Java. The glyphs for each
Fontobject has to be rendered and painted on theGraphicsobject. With a lot of text on the object, theFontobject along with all the usedGlyphsare recreated, causing a massive slowdown.Even using JOGL, there is a significant slowdown. But using the same
TextRendererobject alleviates this by creating a singleFontobject and reusing it as long as theTextRendereris alive. Of course, this restricts you from using multiple Font objects, as JOGL has yet to implement asetFontfunction, requiring you to create a newTextRendererobject for each new font, font style, and font weight.Hope this helps anyone with similar issues.