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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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 com.android.tv.util;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
public class BitmapUtils {
private static final String TAG = "BitmapUtils";
private static final int MARK_READ_LIMIT = 10 * 1024; // 10K
private BitmapUtils() { /* cannot be instantiated */ }
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx, float targetWidth,
float targetHeight) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.BLACK);
canvas.drawARGB(0, 0, 0, 0);
canvas.drawRoundRect(rectF, roundPx * bitmap.getWidth() / targetWidth,
roundPx * bitmap.getHeight() / targetHeight, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
public static Bitmap scaleBitmap(Bitmap bm, int maxWidth, int maxHeight) {
final double ratio = maxHeight / (double) maxWidth;
final double bmRatio = bm.getHeight() / (double) bm.getWidth();
Bitmap result = null;
Rect rect = new Rect();
if (ratio > bmRatio) {
rect.right = maxWidth;
rect.bottom = Math.round((float) bm.getHeight() * maxWidth / bm.getWidth());
} else {
rect.right = Math.round((float) bm.getWidth() * maxHeight / bm.getHeight());
rect.bottom = maxHeight;
}
result = Bitmap.createBitmap(rect.right, rect.bottom, bm.getConfig());
Canvas canvas = new Canvas(result);
canvas.drawBitmap(bm, null, rect, null);
return result;
}
/*
* Decode large sized bitmap into required size.
*/
public static Bitmap decodeSampledBitmapFromUriString(Context context, String uriString,
int reqWidth, int reqHeight) {
if (TextUtils.isEmpty(uriString)) {
return null;
}
InputStream is = null;
try {
is = getInputStream(context, uriString);
if (is == null) {
return null;
}
// We doesn't trust TIS to provide us with proper sized image
Bitmap bitmap = decodeSampledBitmapFromStream(is, reqWidth, reqHeight);
if (bitmap != null) {
return bitmap;
}
closeInputStream(is);
is = getInputStream(context, uriString);
if (is == null) {
return null;
}
return BitmapFactory.decodeStream(is);
} finally {
closeInputStream(is);
}
}
/*
* Decode large sized bitmap into required size.
* If it returns null, the InputStream should be closed and re-opened.
*/
public static Bitmap decodeSampledBitmapFromStream(InputStream is, int reqWidth,
int reqHeight) {
// The input stream is read two times, so BufferedInputStream which supports marking should
// be used.
BufferedInputStream bis = new BufferedInputStream(is);
// 10K is the sufficient for the image header, because only the image header will be read
// at the first time.
bis.mark(MARK_READ_LIMIT);
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(bis, null, options);
// Reset the input stream to read from the start.
try {
bis.reset();
} catch (IOException e) {
Log.i(TAG, "Failed to reset input stream.", e);
return null;
}
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeStream(bis, null, options);
}
private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth,
int reqHeight) {
// Raw height and width of image
// They are shifted right by one bit which causes an effect that inSampleSize is shifted
// left by one bit.
int width = options.outWidth >> 1;
int height = options.outHeight >> 1;
int inSampleSize = 1;
// Calculate the largest inSampleSize value that is a power of 2 and keeps either
// height and width larger than the requested height and width.
while (width > reqWidth || height > reqHeight) {
width >>= 1;
height >>= 1;
inSampleSize <<= 1;
}
return inSampleSize;
}
private static InputStream getInputStream(Context context, String uriString) {
try {
return new URL(uriString).openStream();
} catch (MalformedURLException e) {
try {
return context.getContentResolver().openInputStream(Uri.parse(uriString));
} catch (FileNotFoundException ex) {
Log.i(TAG, "Unable to load uri: " + uriString);
}
} catch (IOException e) {
Log.i(TAG, "Failed to open stream: " + uriString);
}
return null;
}
private static void closeInputStream(InputStream is) {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// Does nothing.
}
}
}
}
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