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profiling says: caching qrCode bitmaps is a good idea

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Vincent Breitmoser
2015-04-27 13:51:39 +02:00
parent 9eb98f6eb7
commit 8dbb82a8b6
2 changed files with 41 additions and 17 deletions
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44
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/QrCodeUtils.java
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@@ -29,6 +29,7 @@ import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.KeychainApplication;
import org.sufficientlysecure.keychain.util.Log;
import java.util.Hashtable;
@@ -40,36 +41,45 @@ public class QrCodeUtils {
/**
* Generate Bitmap with QR Code based on input.
*
* @param input
* @param size
* @return QR Code as Bitmap
*/
public static Bitmap getQRCodeBitmap(final String input, final int size) {
try {
final Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
final BitMatrix result = new QRCodeWriter().encode(input, BarcodeFormat.QR_CODE, size,
size, hints);
final int width = result.getWidth();
final int height = result.getHeight();
final int[] pixels = new int[width * height];
// the qrCodeCache is handled in KeychainApplication so we can
// properly react to onTrimMemory calls
Bitmap bitmap = KeychainApplication.qrCodeCache.get(input);
if (bitmap == null) {
for (int y = 0; y < height; y++) {
final int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
BitMatrix result = new QRCodeWriter().encode(input, BarcodeFormat.QR_CODE, size,
size, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
final int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.TRANSPARENT;
}
}
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
KeychainApplication.qrCodeCache.put(input, bitmap);
}
final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
} catch (final WriterException e) {
} catch (WriterException e) {
Log.e(Constants.TAG, "QrCodeUtils", e);
return null;
}
}
}