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In order to make it easier to change the test font family, add it
as a define in the global header and always reference the macro in
the tests.
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Avoid calling libtool to link every single test case, by building just one
binary from all the sources.
This binary is then given the task of choosing tests to run (based on user
selection and individual test requirement), forking each test into its own
process and accumulating the results.
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In order to run under memfault, the framework is first extended to handle
running concurrent tests - i.e. multi-threading. (Not that this is a
requirement for memfault, instead it shares a common goal of storing
per-test data). To that end all the global data is moved into a per-test
context and the targets are adjusted to avoid overlap on shared, global
resources (such as output files and frame buffers). In order to preserve
the simplicity of the standard draw routines, the context is not passed
explicitly as a parameter to the routines, but is instead attached to the
cairo_t via the user_data.
For the masochist, to enable the tests to be run across multiple threads
simply set the environment variable CAIRO_TEST_NUM_THREADS to the desired
number.
In the long run, we can hope the need for memfault (runtime testing of
error paths) will be mitigated by static analysis. A promising candidate
for this task would appear to be http://hal.cs.berkeley.edu/cil/.
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https://bugs.freedesktop.org/show_bug.cgi?id=13084 demonstrates a
regression where the clip is ignored by the xlib backend whilst
rendering text. Therefore we extend the current test cases to combine
a clip that represents everything clipped out with the rendering of
text. For completeness, we add a new test case that exactly mimics the
sequence of cairo operations that lead to the discovery of this bug -
namely the rendering of text with an empty clip path.
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