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c_hal | ||
slow_hal | ||
README.md |
Custom HAL samples
Samples in this folder are intended to demonstrate functionality replacement mechanism in the OpenCV library.
The c_hal is the example of pure C replacement library with all functions returning error. It can be used to verify error handling in the function switching code.
The slow_hal contains naive C++ implementations of the element-wise logical array operations (and, or, xor, not) making them twice slower than the default.
Build custom HAL replacement library
- Create folder for build (for example
<home-dir>/my-hal-build
) - Go to the created folder and run cmake:
cmake <opencv-src>/samples/hal/slow_hal
- Run make
After build you will find static library in the build folder: libslow_hal.a
Build OpenCV with HAL replacement
- Create folder for build (for example
<home-dir>/my-opencv-build
) - Go to the created folder and run cmake:
cmake \ -DOpenCV_HAL_DIR="<home-dir>/my-hal-build/" \ <opencv-src>
- Run make (or
make opencv_perf_core
to build the demonstration test executable only) - After build you can run the tests and verify that some functions works slower:
./bin/opencv_perf_core --gtest_filter=*bitwise_and*