/*
* Copyright (C) 2017 Peng fei Pan <sky@xiaopan.me>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package me.xiaopan.sketch.decode;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import me.xiaopan.sketch.SLog;
import me.xiaopan.sketch.SLogType;
import me.xiaopan.sketch.SketchMonitor;
import me.xiaopan.sketch.cache.BitmapPool;
import me.xiaopan.sketch.cache.BitmapPoolUtils;
import me.xiaopan.sketch.drawable.ImageAttrs;
import me.xiaopan.sketch.feature.ImageSizeCalculator;
import me.xiaopan.sketch.feature.ResizeCalculator;
import me.xiaopan.sketch.request.LoadOptions;
import me.xiaopan.sketch.request.LoadRequest;
import me.xiaopan.sketch.request.Resize;
import me.xiaopan.sketch.util.SketchUtils;
public class ThumbnailModeDecodeHelper implements DecodeHelper {
private static final String LOG_NAME = "ThumbnailModeDecodeHelper";
/**
* 要想使用缩略图功能需要配置开启缩略图功能、配置resize并且图片格式和系统版本支持BitmapRegionDecoder才行
*/
@Override
public boolean match(LoadRequest request, DataSource dataSource, ImageType imageType, BitmapFactory.Options boundOptions) {
LoadOptions loadOptions = request.getOptions();
if (!loadOptions.isThumbnailMode()
|| !SketchUtils.sdkSupportBitmapRegionDecoder()
|| !SketchUtils.formatSupportBitmapRegionDecoder(imageType)) {
return false;
}
Resize resize = loadOptions.getResize();
if (resize == null) {
SLog.e(LOG_NAME, "thumbnailMode need resize ");
return false;
}
// 只有原始图片的宽高比和resize的宽高比相差3倍的时候才能使用略略图方式读取图片
ImageSizeCalculator sizeCalculator = request.getConfiguration().getImageSizeCalculator();
return sizeCalculator.canUseThumbnailMode(boundOptions.outWidth, boundOptions.outHeight,
resize.getWidth(), resize.getHeight());
}
@Override
public DecodeResult decode(LoadRequest request, DataSource dataSource, ImageType imageType,
BitmapFactory.Options boundOptions, BitmapFactory.Options decodeOptions, int orientation) {
decodeOptions.outWidth = boundOptions.outWidth;
decodeOptions.outHeight = boundOptions.outHeight;
decodeOptions.outMimeType = boundOptions.outMimeType;
// 缩略图模式强制质量优先
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD_MR1
&& !decodeOptions.inPreferQualityOverSpeed) {
decodeOptions.inPreferQualityOverSpeed = true;
}
LoadOptions loadOptions = request.getOptions();
Resize resize = loadOptions.getResize();
ImageSizeCalculator sizeCalculator = request.getConfiguration().getImageSizeCalculator();
// 计算resize区域在原图中的对应区域
ResizeCalculator resizeCalculator = request.getConfiguration().getResizeCalculator();
ResizeCalculator.Result result = resizeCalculator.calculator(boundOptions.outWidth, boundOptions.outHeight,
resize.getWidth(), resize.getHeight(), resize.getScaleType(), false);
boolean supportLargeImage = SketchUtils.supportLargeImage(request, imageType);
// 根据resize的大小和原图中对应区域的大小计算缩小倍数，这样会得到一个较为清晰的缩略图
decodeOptions.inSampleSize = sizeCalculator.calculateInSampleSize(result.srcRect.width(), result.srcRect.height(),
resize.getWidth(), resize.getHeight(), supportLargeImage);
if (BitmapPoolUtils.sdkSupportInBitmapForRegionDecoder() && !loadOptions.isBitmapPoolDisabled()) {
BitmapPool bitmapPool = request.getConfiguration().getBitmapPool();
BitmapPoolUtils.setInBitmapFromPoolForRegionDecoder(decodeOptions, result.srcRect, bitmapPool);
}
Bitmap bitmap = null;
try {
bitmap = DefaultImageDecoder.decodeRegionBitmap(dataSource, result.srcRect, decodeOptions);
} catch (IllegalArgumentException e) {
e.printStackTrace();
// TODO: 2017/5/9 过滤异常message，准确的识别出inBitmap异常
// 要是因为inBitmap而解码失败就记录日志并再此尝试
if (BitmapPoolUtils.sdkSupportInBitmapForRegionDecoder()) {
if (!loadOptions.isBitmapPoolDisabled() && decodeOptions.inBitmap != null) {
BitmapPool bitmapPool = request.getConfiguration().getBitmapPool();
SketchMonitor sketchMonitor = request.getConfiguration().getMonitor();
BitmapPoolUtils.inBitmapThrowForRegionDecoder(e, decodeOptions, sketchMonitor, bitmapPool,
request.getUri(), boundOptions.outWidth, boundOptions.outHeight, result.srcRect);
decodeOptions.inBitmap = null;
try {
bitmap = DefaultImageDecoder.decodeRegionBitmap(dataSource, result.srcRect, decodeOptions);
} catch (Throwable error) {
error.printStackTrace();
sketchMonitor.onDecodeNormalImageError(error, request, boundOptions.outWidth,
boundOptions.outHeight, boundOptions.outMimeType);
}
}
}
} catch (Throwable error) {
error.printStackTrace();
SketchMonitor sketchMonitor = request.getConfiguration().getMonitor();
sketchMonitor.onDecodeNormalImageError(error, request,
boundOptions.outWidth, boundOptions.outHeight, boundOptions.outMimeType);
}
// 过滤掉无效的图片
if (bitmap == null || bitmap.isRecycled()) {
DefaultImageDecoder.decodeError(request, dataSource, LOG_NAME);
return null;
}
// 过滤宽高小于等于1的图片
if (bitmap.getWidth() <= 1 || bitmap.getHeight() <= 1) {
if (SLogType.REQUEST.isEnabled()) {
SLog.w(SLogType.REQUEST, LOG_NAME,
"image width or height less than or equal to 1px. imageSize: %dx%d. bitmapSize: %dx%d. %s",
boundOptions.outWidth, boundOptions.outHeight, bitmap.getWidth(), bitmap.getHeight(), request.getKey());
}
bitmap.recycle();
DefaultImageDecoder.decodeError(request, dataSource, LOG_NAME);
return null;
}
// 成功
DefaultImageDecoder.decodeSuccess(bitmap, boundOptions.outWidth, boundOptions.outHeight,
decodeOptions.inSampleSize, request, LOG_NAME);
ImageAttrs imageAttrs = new ImageAttrs(boundOptions.outMimeType,
boundOptions.outWidth, boundOptions.outHeight, orientation);
return new BitmapDecodeResult(imageAttrs, bitmap).setProcessed(true);
}
}