TimelineBitmapCompress.java

package org.aisen.weibo.sina.support.compress;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapRegionDecoder;
import android.graphics.Rect;

import org.aisen.android.common.context.GlobalContext;
import org.aisen.android.common.utils.Logger;
import org.aisen.android.common.utils.SystemUtils;
import org.aisen.android.component.bitmaploader.core.BitmapDecoder;
import org.aisen.android.component.bitmaploader.core.IBitmapCompress;
import org.aisen.android.component.bitmaploader.core.ImageConfig;

import java.io.File;

public class TimelineBitmapCompress implements IBitmapCompress {

	public static final String TAG = "TimelineCompress";
	
	@Override
	public Bitmap compress(byte[] bitmapBytes, File file, String url, ImageConfig config, int origW, int origH) throws Exception {
		Logger.v("ATimeline", "压缩小图片");
		
		Bitmap bitmap = null;

		int maxWidth = config.getMaxWidth() == 0 ? SystemUtils.getScreenWidth(GlobalContext.getInstance()) : config.getMaxWidth();
		int maxHeight = config.getMaxHeight() == 0 ? SystemUtils.getScreenHeight(GlobalContext.getInstance()) : config.getMaxHeight();
		
		// 如果高度比宽度在2倍以上，取高度的一部分
		if (origH * 1.0f / origW > 2) {
			int reqHeight = maxHeight;
			
			// 截取局部图片
			BitmapRegionDecoder bitmapDecoder = BitmapRegionDecoder.newInstance(bitmapBytes, 0, bitmapBytes.length, true);
			Rect rect = new Rect(0, 0, origW, reqHeight);
			bitmap = bitmapDecoder.decodeRegion(rect, null).copy(Config.ARGB_8888, true);
			
		} else {
			bitmap = BitmapDecoder.decodeSampledBitmapFromByte(bitmapBytes, maxWidth, maxHeight);
		}
		
		Logger.d(TAG, String.format("bitmap width = %d, height = %d", bitmap.getWidth(), bitmap.getHeight()));
		return bitmap;
	}

}