ImageDrawable.java 文件源码

private static void updateShaderAndSize(@NonNull ImageView.ScaleType scaleType, int vWidth, int vHeight, ImageDrawable imageDrawable, BitmapShader bitmapShader) {
  Matrix matrix = createShaderMatrix(scaleType, vWidth, vHeight,
                                     imageDrawable.bitmapWidth,
                                     imageDrawable.bitmapHeight);
  int intrinsicWidth = vWidth, intrinsicHeight = vHeight;
  if (scaleType == ImageView.ScaleType.FIT_CENTER) {
    RectF bitmapRect = new RectF(0, 0, imageDrawable.bitmapWidth, imageDrawable.bitmapHeight), contentRect = new RectF();
    matrix.mapRect(contentRect, bitmapRect);
    intrinsicWidth = (int) contentRect.width();
    intrinsicHeight = (int) contentRect.height();
    matrix = createShaderMatrix(scaleType, intrinsicWidth, intrinsicHeight, imageDrawable
        .bitmapWidth, imageDrawable.bitmapHeight);
  }
  imageDrawable.setIntrinsicWidth(intrinsicWidth);
  imageDrawable.setIntrinsicHeight(intrinsicHeight);
  bitmapShader.setLocalMatrix(matrix);
}