ImageProcessor.java 文件源码

public Bitmap doHighlightImage(Bitmap originalImage, int radius, @ColorInt int highlightColor) {
  Bitmap resultingBitmap =
      Bitmap.createBitmap(originalImage.getWidth() + 96, originalImage.getHeight() + 96,
          Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(resultingBitmap);
  canvas.drawColor(0, PorterDuff.Mode.CLEAR);
  Paint paintBlur = new Paint();
  paintBlur.setMaskFilter(new BlurMaskFilter(radius, BlurMaskFilter.Blur.NORMAL));
  int[] offsetXY = new int[2];
  Bitmap bitmapAlpha = originalImage.extractAlpha(paintBlur, offsetXY);
  Paint paintAlphaColor = new Paint();
  paintAlphaColor.setColor(highlightColor);
  canvas.drawBitmap(bitmapAlpha, offsetXY[0], offsetXY[1], paintAlphaColor);
  bitmapAlpha.recycle();
  canvas.drawBitmap(originalImage, 0, 0, null);
  return resultingBitmap;
}