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The bounding box of the text is rounded to the nearest pixel boundaries,
so therefore the test must accept a similar level of imprecision.
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Need to check that an error was not raised on the context before checking
whether the extents match expectations.
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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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comparison
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This is done grudgingly due to freetype rounding the coordinates
of the extents when hinting is enabled.
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That causes some tests to be skipped if the preceding test failed.
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It's a common idiom to stroke degenerate sub-paths made with
cairo_move_to(x,y);cairo_rel_line_to(0,0) to draw dots. Test
that we get the desired extents from cairo_fill_extents,
cairo_stroke_extents, and cairo_path_extents for these cases.
Also document that the cairo_path_extents result is equivalent
to the limit of stroking with CAIRO_LINE_CAP_ROUND, (so that
these "dot" points are included), as the line width
approaches 0.0 .
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With these degenerate shapes, cairo_path_extents still returns
a zero-area rectangle, but with a non-zero offset.
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This wasn't affecting the test quality at all, but it did annoy
me to see this mistake.
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This new function gets the extents of the current path, whether
or not they would be inked by a 'fill'. It differs from
cairo_fill_extents() when the area enclosed by the path is 0.
Includes documentation and updated test.
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Compare cairo_scaled_font_text_extents() to cairo_text_extents() in
order to provide test coverage of cairo_scaled_font_text_extents().
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Ensure that degenerate paths have zero extents.
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cairo_get_target() returns the original surface passed to
cairo_create(), and not the current destination as required when
testing drawing to the same surface using multiple contexts.
For completeness we also use the group target when creating similar
surfaces within the tests (to check that similar surfaces of similar
surfaces also work).
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Add a link to the original bug report for the broken extents with arcs.
[http://bugs.freedesktop.org/show_bug.cgi?id=7245]
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Check that the text path extents match the computed metrics.
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Add the test case from bug 7245,
https://bugs.freedesktop.org/show_bug.cgi?id=7245.
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Add new public API methods:
void cairo_clip_extents (cairo_t *cr, double *x1, double *y1,
double *x2, double *y2);
cairo_rectangle_list_t *cairo_copy_clip_rectangles (cairo_t *);
void cairo_rectangle_list_destroy (cairo_rectangle_list_t *);
Also add 'get-clip' and 'get-path-extents' tests.
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