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test/path-precision.c: Correct initialization, error margin for comparisons

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This commit is contained in:
Heiko Lewin 2021-02-04 01:39:15 +01:00
parent 48194cf093
commit fb017cc73a
1 changed files with 24 additions and 6 deletions
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30
test/path-precision.c
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@ -24,32 +24,50 @@
*
* Based on an example by Dirk "krit" Schulze found during WebKit integration.
*/
/* Copyright (C) 2021 Heiko Lewin <hlewin@gmx.de>
* Added error margin for point comparisons */
#include "cairo-test.h"
#include "cairo-fixed-type-private.h"
/* we know that this is an inherent limitation in cairo */
#define FAIL CAIRO_TEST_XFAILURE
/* Test the idempotency of path construction and copying */
/* The error to be expected from double<->fixed conversions */
#define EXPECTED_ERROR (0.5 / (1<<CAIRO_FIXED_FRAC_BITS))
static int compare_points( double *p1, double *p2 ) {
for(int i=0; i<2; ++i) {
double error = fabs(p2[i]-p1[i]);
if(error > EXPECTED_ERROR) {
return 1;
}
}
return 0;
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_path_data_t path_data[] = {
{ { CAIRO_PATH_MOVE_TO, 2 }, },
{ { 95.000000, 40.000000 }, },
{ .point={ 95.000000, 40.000000 }, },
{ { CAIRO_PATH_LINE_TO, 2 }, },
{ { 94.960533, 41.255810 }, },
{ .point={ 94.960533, 41.255810 }, },
{ { CAIRO_PATH_LINE_TO, 2 }, },
{ { 94.842293, 42.50666 }, },
{ .point={ 94.842293, 42.50666 }, },
{ { CAIRO_PATH_LINE_TO, 2 }, },
{ { 94.645744, 43.747627 }, },
{ .point={ 94.645744, 43.747627 }, },
{ { CAIRO_PATH_LINE_TO, 2 }, },
{ { 94.371666, 44.973797 }, },
{ .point={ 94.371666, 44.973797 }, },
};
const cairo_test_context_t *ctx = cairo_test_get_context (cr);
cairo_path_t path, *path_copy;
@ -87,7 +105,7 @@ draw (cairo_t *cr, int width, int height)
break;
}
if (memcmp (&src[1].point, &dst[1].point, sizeof (src->point))) {
if (compare_points ((double*)&src[1].point, (double*)&dst[1].point)) {
cairo_test_log (ctx,
"Paths differ in coordinates after %d operations.\n"
"Expected point (%f, %f), found (%f, %f).\n",