从调色板创建图像的最佳方法Color array + indice byte array？ [英] Best way to create Image from palette Color array + indice byte array?

问题描述

我正在开发一个Java组件来显示一些视频和视频的每一帧，我的解码器给了我一个Color [256]调色板+一个宽*高的字节像素索引数组。以下是我现在如何创建 BufferedImage ：

I'm developing a Java component for displaying some videos and for each frame of the video, my decoder gives me a Color[256] palette + a width*height bytes pixel indices array. Here's how I create my BufferedImage right now:

byte[] iArray = new byte[width * height * 3];
int j = 0;
for (byte i : this.lastFrameData) {
    iArray[j] = (byte) this.currentPalette[i & 0xFF].getRed();
    iArray[j + 1] = (byte) this.currentPalette[i & 0xFF].getGreen();
    iArray[j + 2] = (byte) this.currentPalette[i & 0xFF].getBlue();
    j += 3;
}
DataBufferByte dbb = new DataBufferByte(iArray, iArray.length);
ColorModel cm = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB), new int[] { 8, 8, 8 }, false, false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
return new BufferedImage(cm, Raster.createInterleavedRaster(dbb, width, height, width * 3, 3, new int[] { 0, 1, 2 }, null), false, null);

这有效，但看起来很难看，我确信有更好的方法。那么创建 BufferedImage 的最快方法是什么呢？

This works but it looks ugly and I'm sure there is a better way. So what would the fastest way to create the BufferedImage be then?

/编辑：我尝试过使用setRGB方法直接在我的BufferedImage上，但它导致了比上面更差的性能。

/ I've tried using the setRGB method directly on my BufferedImage but it resulted in worse performance than the above.

谢谢

推荐答案

我会这样做：

 int[] imagePixels = new int[width * height]

 int j = 0;
 for (byte i : this.lastFrameData) {
    byte r = (byte) this.currentPalette[i & 0xFF].getRed();
    byte g = (byte) this.currentPalette[i & 0xFF].getGreen();
    byte b = (byte) this.currentPalette[i & 0xFF].getBlue();
    imagePixels[j] = 0xFF000000 | (r<<16) | (g<<8) | b;
    j++;
 }

 BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
 result.setRGB(0, 0, width, height, imagePixels , 0, width);
 return result;

可能更快，不要测试它。

Maybe it is faster don't test it yet.

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