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[test] Compare a failure against the image output

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If a backend fails in exactly the same way as the image, then we can
safely assume that the failure is systematic and not an error in the
backend, so change the result to XFAIL.
This commit is contained in:
Chris Wilson 2009-09-09 13:57:06 +01:00
parent 41fbea053a
commit abaef9bfbe
1 changed files with 46 additions and 0 deletions
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46
test/cairo-test.c
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@ -1369,6 +1369,52 @@ REPEAT:
cairo_test_copy_file (test_filename, pass_filename);
}
/* If failed, compare against the current image output,
* and attempt to detect systematic failures.
*/
if (ret == CAIRO_TEST_FAILURE) {
char *image_out_path;
image_out_path =
cairo_test_reference_filename (ctx,
base_name,
ctx->test_name,
"image",
"image",
format,
CAIRO_TEST_OUT_SUFFIX,
CAIRO_TEST_PNG_EXTENSION);
if (image_out_path != NULL) {
if (cairo_test_files_equal (out_png_path,
image_out_path))
{
ret = CAIRO_TEST_XFAILURE;
}
else
{
ref_image =
cairo_image_surface_create_from_png (image_out_path);
if (cairo_surface_status (ref_image) == CAIRO_STATUS_SUCCESS)
{
diff_status = image_diff (ctx,
test_image, ref_image,
diff_image,
&result);
if (diff_status == CAIRO_STATUS_SUCCESS &&
(result.pixels_changed == 0 ||
result.max_diff > target->error_tolerance))
{
ret = CAIRO_TEST_XFAILURE;
}
cairo_surface_destroy (ref_image);
}
}
free (image_out_path);
}
}
cairo_surface_destroy (test_image);
cairo_surface_destroy (diff_image);
}