blob: 1eef402eef69ec4f5520c5db597b9a2092db91fa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
# Improved JPEG decoder implementation
This subdirectory contains a JPEG decoder implementation that is API and ABI
compatible with libjpeg62.
*NOTE*: This is still a work in progress, currently only API functions called
from libjxl's benchmark_xl tool are implemented.
To decompress an ```input.jpg``` file with this new library:
```
(from the libjxl root directory)
$ ./ci.sh opt
$ LD_PRELOAD=./build/libjpeg.so.62 ./build/tools/benchmark_xl --input input.jpg --codec=jpeg --decode_only --save_decompressed --output_dir .
```
The decompressed file will be saved as ```input.jpg.jpeg.png```.
To benchmark the jpeg encoding-decoding round-trip on an ```input.png``` with
the new library, first build a statically linked ```cjpeg-static``` binary,
which is found in ```$PATH```, and then run:
```
(from the libjxl root directory)
$ ./ci.sh opt
$ LD_PRELOAD=./build/libjpeg.so.62 ./build/tools/benchmark_xl --input input.png --codec=jpeg:cjpeg-static:q90
```
|
