src/android/src/com/google/android/inputmethod/japanese/view/MozcPictureDrawable.java

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package org.mozc.android.inputmethod.japanese.view;

import com.google.common.base.Preconditions;

import android.graphics.Canvas;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PictureDrawable;

/**
 * This class is very similar to {@link PictureDrawable}, except this class scale to fit
 * to the given bounding box as similar to other drawables.
 *
 */
public class MozcPictureDrawable extends PictureDrawable {
  public MozcPictureDrawable(Picture picture) {
    super(Preconditions.checkNotNull(picture));
  }

  @Override
  public void draw(Canvas canvas) {
    Preconditions.checkArgument(!canvas.isHardwareAccelerated(),
        "MozcPictureDrawable doesn't accept h/w accelerated canvas, "
        + "which doesn't support drawPicture().");
    Picture picture = getPicture();
    if (picture == null) {
      return;
    }
    Rect bounds = getBounds();
    int saveCount = canvas.save();
    try {
      canvas.clipRect(bounds);
      canvas.translate(bounds.left, bounds.top);
      float scaleX = bounds.width() / (float) getIntrinsicWidth();
      float scaleY = bounds.height() / (float) getIntrinsicHeight();
      canvas.scale(scaleX, scaleY);
      canvas.drawPicture(picture);
    } finally {
      canvas.restoreToCount(saveCount);
    }
  }

  @Override
  public ConstantState getConstantState() {
    return new ConstantState() {
      @Override
      public int getChangingConfigurations() {
        return 0;
      }

      @Override
      public Drawable newDrawable() {
        return new MozcPictureDrawable(getPicture());
      }
    };
  }
}