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JPEG compression and decompression accelerated on GPU

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Performance

Following tables summarizes encoding/decoding performance using NVIDIA GTX 580 for different quality settings (time, PSNR and encoded size values are averages of encoding several images, each of them multiple times):

Encoding:

         |           4k (4096x2160)         |         HD (1920x1080)
 --------+----------------------------------+---------------------------------
 quality | duration |     psnr |       size | duration |     psnr |       size
 --------+----------+----------+------------+---------------------------------
      10 | 26.79 ms | 29.33 dB |  539.30 kB |  6.71 ms | 27.41 dB |  145.90 kB
      20 | 26.91 ms | 32.70 dB |  697.20 kB |  6.74 ms | 30.32 dB |  198.30 kB
      30 | 27.17 ms | 34.63 dB |  850.60 kB |  6.84 ms | 31.92 dB |  243.60 kB
      40 | 27.19 ms | 35.97 dB |  958.90 kB |  6.89 ms | 32.99 dB |  282.20 kB
      50 | 27.29 ms | 36.94 dB | 1073.30 kB |  6.92 ms | 33.82 dB |  319.10 kB
      60 | 27.39 ms | 37.96 dB | 1217.10 kB |  6.95 ms | 34.65 dB |  360.00 kB
      70 | 27.51 ms | 39.22 dB | 1399.20 kB |  7.04 ms | 35.71 dB |  422.10 kB
      80 | 27.76 ms | 40.67 dB | 1710.00 kB |  7.13 ms | 37.15 dB |  526.70 kB
      90 | 28.36 ms | 42.83 dB | 2441.40 kB |  7.32 ms | 39.84 dB |  768.40 kB
     100 | 35.47 ms | 47.09 dB | 7798.70 kB |  9.31 ms | 47.21 dB | 2499.60 kB

Decoding:

         |           4k (4096x2160)         |         HD (1920x1080)
 --------+----------------------------------+---------------------------------
 quality | duration |     psnr |       size | duration |     psnr |       size
 --------+----------+----------+------------+---------------------------------
      10 | 10.28 ms | 29.33 dB |  539.30 kB |  3.13 ms | 27.41 dB |  145.90 kB
      20 | 11.31 ms | 32.70 dB |  697.20 kB |  3.59 ms | 30.32 dB |  198.30 kB
      30 | 12.36 ms | 34.63 dB |  850.60 kB |  3.97 ms | 31.92 dB |  243.60 kB
      40 | 12.90 ms | 35.97 dB |  958.90 kB |  4.28 ms | 32.99 dB |  282.20 kB
      50 | 13.45 ms | 36.94 dB | 1073.30 kB |  4.56 ms | 33.82 dB |  319.10 kB
      60 | 14.71 ms | 37.96 dB | 1217.10 kB |  4.81 ms | 34.65 dB |  360.00 kB
      70 | 15.03 ms | 39.22 dB | 1399.20 kB |  5.24 ms | 35.71 dB |  422.10 kB
      80 | 16.64 ms | 40.67 dB | 1710.00 kB |  5.89 ms | 37.15 dB |  526.70 kB
      90 | 19.99 ms | 42.83 dB | 2441.40 kB |  7.48 ms | 39.84 dB |  768.40 kB
     100 | 46.45 ms | 47.09 dB | 7798.70 kB | 16.42 ms | 47.21 dB | 2499.60 kB