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/*
* Copyright © 2004 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of
* Red Hat, Inc. not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. Red Hat, Inc. makes no representations about the
* suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Carl D. Worth <cworth@cworth.org>
*/
#include <unistd.h>
#include <errno.h>
#include "cairo_test.h"
#include "read_png.h"
#include "write_png.h"
#include "xmalloc.h"
#define CAIRO_TEST_PNG_SUFFIX "-out.png"
#define CAIRO_TEST_REF_SUFFIX "-ref.png"
#define CAIRO_TEST_DIFF_SUFFIX "-diff.png"
static void
xasprintf (char **strp, const char *fmt, ...)
{
va_list va;
int ret;
va_start (va, fmt);
ret = vasprintf (strp, fmt, va);
va_end (va);
if (ret < 0) {
fprintf (stderr, "Out of memory\n");
exit (1);
}
}
/* Image comparison code courttesy of Richard Worth.
* Returns number of pixels changed.
* Also fills out a "diff" image intended to visually show where the
* images differ.
*/
static int
image_diff (char *buf_a, char *buf_b, char *buf_diff,
int width, int height, int stride)
{
int x, y;
int total_pixels_changed = 0;
unsigned char *row_a, *row_b, *row;
for (y = 0; y < height; y++)
{
row_a = buf_a + y * stride;
row_b = buf_b + y * stride;
row = buf_diff + y * stride;
for (x = 0; x < width; x++)
{
int channel;
unsigned char value_a, value_b;
int pixel_changed = 0;
for (channel = 0; channel < 4; channel++)
{
double diff;
value_a = row_a[x * 4 + channel];
value_b = row_b[x * 4 + channel];
if (value_a != value_b)
pixel_changed = 1;
diff = value_a - value_b;
row[x * 4 + channel] = 128 + diff / 3.0;
}
if (pixel_changed) {
total_pixels_changed++;
} else {
row[x*4+0] = 0;
row[x*4+1] = 0;
row[x*4+2] = 0;
}
row[x * 4 + 3] = 0xff; /* Set ALPHA to 100% (opaque) */
}
}
return total_pixels_changed;
}
cairo_test_status_t
cairo_test (cairo_test_t *test, cairo_test_draw_function_t draw)
{
cairo_t *cr;
int stride;
unsigned char *png_buf, *ref_buf, *diff_buf;
char *png_name, *ref_name, *diff_name;
char *srcdir;
int pixels_changed;
int ref_width, ref_height, ref_stride;
read_png_status_t png_status;
cairo_test_status_t ret;
/* The cairo part of the test is the easiest part */
cr = cairo_create ();
stride = 4 * test->width;
png_buf = xcalloc (stride * test->height, 1);
diff_buf = xcalloc (stride * test->height, 1);
cairo_set_target_image (cr, png_buf, CAIRO_FORMAT_ARGB32,
test->width, test->height, stride);
(draw) (cr, test->width, test->height);
cairo_destroy (cr);
/* Then we've got a bunch of string manipulation and file I/O for the check */
srcdir = getenv ("srcdir");
if (!srcdir)
srcdir = "";
xasprintf (&png_name, "%s%s", test->name, CAIRO_TEST_PNG_SUFFIX);
xasprintf (&ref_name, "%s/%s%s", srcdir, test->name, CAIRO_TEST_REF_SUFFIX);
xasprintf (&diff_name, "%s%s", test->name, CAIRO_TEST_DIFF_SUFFIX);
write_png_argb32 (png_buf, png_name, test->width, test->height, stride);
ref_buf = NULL;
png_status = (read_png_argb32 (ref_name, &ref_buf, &ref_width, &ref_height, &ref_stride));
if (png_status) {
switch (png_status)
{
case READ_PNG_FILE_NOT_FOUND:
fprintf (stderr, " Error: No reference image found: %s\n", ref_name);
break;
case READ_PNG_FILE_NOT_PNG:
fprintf (stderr, " Error: %s is not a png image\n", ref_name);
break;
default:
fprintf (stderr, " Error: Failed to read %s\n", ref_name);
}
ret = CAIRO_TEST_FAILURE;
goto BAIL;
}
if (test->width != ref_width || test->height != ref_height) {
fprintf (stderr,
" Error: Image size mismatch: (%dx%d) vs. (%dx%d)\n"
" for %s vs %s\n",
test->width, test->height,
ref_width, ref_height,
png_name, ref_name);
ret = CAIRO_TEST_FAILURE;
goto BAIL;
}
pixels_changed = image_diff (png_buf, ref_buf, diff_buf,
test->width, test->height, stride);
if (pixels_changed) {
fprintf (stderr, " Error: %d pixels differ from reference image %s\n",
pixels_changed, ref_name);
write_png_argb32 (diff_buf, diff_name, test->width, test->height, stride);
ret = CAIRO_TEST_FAILURE;
goto BAIL;
} else {
if (unlink (diff_name) < 0 && errno != ENOENT) {
fprintf (stderr, " Error: Cannot remove %s: %s\n",
diff_name, strerror (errno));
ret = CAIRO_TEST_FAILURE;
goto BAIL;
}
}
ret = CAIRO_TEST_SUCCESS;
BAIL:
free (png_buf);
free (ref_buf);
free (diff_buf);
free (png_name);
free (ref_name);
free (diff_name);
return ret;
}
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