Create bitmap from byte array, which is decompressed from a JPEG file via libjpeg

Question

I used libjpeg (C library) to decompress a JPEG file. Now I have an unsigned char array. How can I create a bitmap from that array in JNI ?

Alex Cohn · Accepted Answer · 2013-07-31 08:22:53Z

5

Yes, it's possible, but there should be a strong justification for going this path. For best performance, use

Bitmap bm = BitmapFactory.decodeByteArray(jpegArray, 0, jpegArray.length);

Even if you need to decode the same jpeg twice - once in C, once in Java, it will save you both programming effort and execution time.

Note that Android has libjpeg built in (see /system/lib on your device), and decodeByteArray() uses it, and is highly optimized.

answered Jul 31, 2013 at 8:22

Alex Cohn

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Co-Gia Over a year ago

Thanks for your answer. I tried the method BitmapFactory.decodeByteArray(jpegArray, 0, jpegArray.length); but failed. I figured out this problem by passing a bitmap object to jni and filled values for that bitmap. It worked.

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