diff options
author | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
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committer | sanine <sanine.not@pm.me> | 2022-10-12 12:03:23 -0500 |
commit | 530ffd0b7d3c39757b20f00716e486b5caf89aff (patch) | |
tree | 76b35fdf57317038acf6b828871f6ae25fce2ebe /libs/cairo-1.16.0/test/imagediff.c | |
parent | 3dbe9332e47c143a237db12440f134caebd1cfbe (diff) |
add cairo
Diffstat (limited to 'libs/cairo-1.16.0/test/imagediff.c')
-rw-r--r-- | libs/cairo-1.16.0/test/imagediff.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/imagediff.c b/libs/cairo-1.16.0/test/imagediff.c new file mode 100644 index 0000000..6ebbcfc --- /dev/null +++ b/libs/cairo-1.16.0/test/imagediff.c @@ -0,0 +1,303 @@ +/* imagediff - Compare two images + * + * Copyright © 2004 Richard D. Worth + * + * 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 Richard Worth + * not be used in advertising or publicity pertaining to distribution + * of the software without specific, written prior permission. + * Richard Worth makes no representations about the suitability of this + * software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * RICHARD WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN + * NO EVENT SHALL RICHARD WORTH 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: Richard D. Worth <richard@theworths.org> */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <errno.h> + +#include "buffer-diff.h" + +static void +_xunlink (const char *pathname) +{ + if (unlink (pathname) < 0 && errno != ENOENT) { + fprintf (stderr, " Error: Cannot remove %s: %s\n", + pathname, strerror (errno)); + exit (1); + } +} + +void +cairo_test_logv (const cairo_test_context_t *ctx, + const char *fmt, va_list va) +{ + vfprintf (stderr, fmt, va); +} + +void +cairo_test_log (const cairo_test_context_t *ctx, const char *fmt, ...) +{ + va_list va; + + va_start (va, fmt); + vfprintf (stderr, fmt, va); + va_end (va); +} + +/* Flatten an ARGB surface by blending it over white. The resulting + * surface, (still in ARGB32 format, but with only alpha==1.0 + * everywhere) is returned in the same surface pointer. + * + * The original surface will be destroyed. + * + * The (x,y) value specify an origin of interest for the original + * image. The flattened image will be generated only from the box + * extending from (x,y) to (width,height). + */ +static void +flatten_surface (cairo_surface_t **surface, int x, int y) +{ + cairo_surface_t *flat; + cairo_t *cr; + + flat = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, + cairo_image_surface_get_width (*surface) - x, + cairo_image_surface_get_height (*surface) - y); + cairo_surface_set_device_offset (flat, -x, -y); + + cr = cairo_create (flat); + cairo_surface_destroy (flat); + + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + + cairo_set_source_surface (cr, *surface, 0, 0); + cairo_surface_destroy (*surface); + cairo_paint (cr); + + *surface = cairo_surface_reference (cairo_get_target (cr)); + cairo_destroy (cr); +} + +/* Given an image surface, create a new surface that has the same + * contents as the sub-surface with its origin at x,y. + * + * The original surface will be destroyed. + */ +static void +extract_sub_surface (cairo_surface_t **surface, int x, int y) +{ + cairo_surface_t *sub; + cairo_t *cr; + + sub = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, + cairo_image_surface_get_width (*surface) - x, + cairo_image_surface_get_height (*surface) - y); + + /* We don't use a device offset like flatten_surface. That's not + * for any important reason, (the results should be + * identical). This style just seemed more natural to me this + * time, so I'm leaving both here so I can look at both to see + * which I like better. */ + cr = cairo_create (sub); + cairo_surface_destroy (sub); + + cairo_set_source_surface (cr, *surface, -x, -y); + cairo_surface_destroy (*surface); + cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE); + cairo_paint (cr); + + *surface = cairo_surface_reference (cairo_get_target (cr)); + cairo_destroy (cr); +} + +static cairo_status_t +stdio_write_func (void *closure, const unsigned char *data, unsigned int length) +{ + FILE *file = closure; + + if (fwrite (data, 1, length, file) != length) + return CAIRO_STATUS_WRITE_ERROR; + + return CAIRO_STATUS_SUCCESS; +} + +static cairo_status_t +write_png (cairo_surface_t *surface, const char *filename) +{ + cairo_status_t status; + FILE *png_file; + + if (filename != NULL) { + png_file = fopen (filename, "wb"); + if (png_file == NULL) { + switch (errno) { + case ENOMEM: + return CAIRO_STATUS_NO_MEMORY; + default: + return CAIRO_STATUS_WRITE_ERROR; + } + } + } else + png_file = stdout; + + status = cairo_surface_write_to_png_stream (surface, + stdio_write_func, + png_file); + + if (png_file != stdout) + fclose (png_file); + + return status; +} + +static cairo_status_t +png_diff (const char *filename_a, + const char *filename_b, + const char *filename_diff, + int ax, + int ay, + int bx, + int by, + buffer_diff_result_t *result) +{ + cairo_surface_t *surface_a; + cairo_surface_t *surface_b; + cairo_surface_t *surface_diff; + cairo_status_t status; + + surface_a = cairo_image_surface_create_from_png (filename_a); + status = cairo_surface_status (surface_a); + if (status) { + fprintf (stderr, "Error: Failed to create surface from %s: %s\n", + filename_a, cairo_status_to_string (status)); + return status; + } + + surface_b = cairo_image_surface_create_from_png (filename_b); + status = cairo_surface_status (surface_b); + if (status) { + fprintf (stderr, "Error: Failed to create surface from %s: %s\n", + filename_b, cairo_status_to_string (status)); + cairo_surface_destroy (surface_a); + return status; + } + + if (ax || ay) { + extract_sub_surface (&surface_a, ax, ay); + ax = ay = 0; + } + + if (bx || by) { + extract_sub_surface (&surface_b, bx, by); + bx = by = 0; + } + + status = cairo_surface_status (surface_a); + if (status) { + fprintf (stderr, "Error: Failed to extract surface from %s: %s\n", + filename_a, cairo_status_to_string (status)); + cairo_surface_destroy (surface_a); + cairo_surface_destroy (surface_b); + return status; + } + status = cairo_surface_status (surface_b); + if (status) { + fprintf (stderr, "Error: Failed to extract surface from %s: %s\n", + filename_b, cairo_status_to_string (status)); + cairo_surface_destroy (surface_a); + cairo_surface_destroy (surface_b); + return status; + } + + surface_diff = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, + cairo_image_surface_get_width (surface_a), + cairo_image_surface_get_height (surface_a)); + status = cairo_surface_status (surface_diff); + if (status) { + fprintf (stderr, + "Error: Failed to allocate surface to hold differences\n"); + cairo_surface_destroy (surface_a); + cairo_surface_destroy (surface_b); + return CAIRO_STATUS_NO_MEMORY; + } + + status = image_diff (NULL, + surface_a, surface_b, surface_diff, + result); + + if (filename_diff) + _xunlink (filename_diff); + + if (status == CAIRO_STATUS_SUCCESS && + result->pixels_changed) + { + status = write_png (surface_diff, filename_diff); + } + + cairo_surface_destroy (surface_a); + cairo_surface_destroy (surface_b); + cairo_surface_destroy (surface_diff); + + return status; +} + +int +main (int argc, char *argv[]) +{ + buffer_diff_result_t result; + cairo_status_t status; + + unsigned int ax, ay, bx, by; + + if (argc != 3 && argc != 7) { + fprintf (stderr, "Usage: %s image1.png image2.png [ax ay bx by]\n", argv[0]); + fprintf (stderr, "Computes an output image designed to present a \"visual diff\" such that even\n"); + fprintf (stderr, "small errors in single pixels are readily apparent in the output.\n"); + fprintf (stderr, "The output image is written on stdout.\n"); + exit (1); + } + + if (argc == 7) { + ax = strtoul (argv[3], NULL, 0); + ay = strtoul (argv[4], NULL, 0); + bx = strtoul (argv[5], NULL, 0); + by = strtoul (argv[6], NULL, 0); + } else { + ax = ay = bx = by = 0; + } + + status = png_diff (argv[1], argv[2], NULL, ax, ay, bx, by, &result); + + if (status) { + fprintf (stderr, "Error comparing images: %s\n", + cairo_status_to_string (status)); + return 1; + } + + if (result.pixels_changed) + fprintf (stderr, "Total pixels changed: %d with a maximum channel difference of %d.\n", + result.pixels_changed, + result.max_diff); + + return (result.pixels_changed != 0); +} |