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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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Tidily destroy the font immediately after use.
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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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If a match cannot be found, or if any other error occured, then fontconfig
will return NULL. Check and propagate.
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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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This test used to be named -truetype, which reflected the type of font used in
the test, in contrast to the -type1 test that uses a Type1 font. However, we
renamed this test to -type3 to emphasize the fact that a TrueType subset is
not emitted for vertical fonts and a Type3 fallback font is generated.
Now things have changed: we try generating a Type1 fallback font which is what
is happening for this test. Moreover, the -typ1 test also is generating a
Type1 fallback font since the Type1 subset font is not useful for vertical
fonts.
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