Compiling with the Intel Compiler reveals a problem:
tolerance-test.c(350): error: index variable "i" of for statement following an OpenMP for pragma must be private
# pragma omp parallel for default(none) shared(i) private (result)
^
In addition to this, the 'result' variable also should not be private
(otherwise its value does not survive after the end of the loop). It
needs to be either shared or use the reduction clause to describe how
the results from multiple threads are combined together. Reduction
seems to be more appropriate here.
This new test program is similar to test/composite in that it relies
on the pixel_checker_t API to do tolerance based verification. But
unlike the composite test, which verifies combinations of a fixed set
of pixels, this one generates random images and verifies that those
composite correctly.
Also unlike composite, tolerance-test supports all the separable blend
mode operators in addition to the original Render operators.
When tests fail, a C struct is printed that can be pasted into
pixel-test for regression purposes.
There is an option "--forever" which causes the random seed to be set
to the current time, and then the test runs until interrupted. This is
useful for overnight runs.
This test currently fails badly due to various bugs in the blend mode
operators. Later commits will fix those.
