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reftest: Split out some functionality into own file
Comparing two surfaces is something that can be nicely factored out.
This commit is contained in:
Benjamin Otte
parent
394a7627c5
commit
0182d1ed38
@ -30,6 +30,8 @@ gtk_reftest_LDADD = \
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$(NULL)
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gtk_reftest_SOURCES = \
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reftest-compare.c \
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reftest-compare.h \
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reftest-module.c \
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reftest-module.h \
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gtk-reftest.c \
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@ -20,6 +20,7 @@
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#include "config.h"
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#include "reftest-compare.h"
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#include "reftest-module.h"
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#include <string.h>
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@ -463,154 +464,6 @@ save_image (cairo_surface_t *surface,
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g_free (filename);
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}
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static void
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get_surface_size (cairo_surface_t *surface,
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int *width,
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int *height)
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{
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GdkRectangle area;
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cairo_t *cr;
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cr = cairo_create (surface);
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if (!gdk_cairo_get_clip_rectangle (cr, &area))
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{
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g_assert_not_reached ();
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}
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g_assert (area.x == 0 && area.y == 0);
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g_assert (area.width > 0 && area.height > 0);
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*width = area.width;
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*height = area.height;
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}
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static cairo_surface_t *
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coerce_surface_for_comparison (cairo_surface_t *surface,
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int width,
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int height)
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{
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cairo_surface_t *coerced;
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cairo_t *cr;
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coerced = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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width,
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height);
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cr = cairo_create (coerced);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_paint (cr);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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g_assert (cairo_surface_status (coerced) == CAIRO_STATUS_SUCCESS);
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return coerced;
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}
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/* Compares two CAIRO_FORMAT_ARGB32 buffers, returning NULL if the
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* buffers are equal or a surface containing a diff between the two
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* surfaces.
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*
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* This function should be rewritten to compare all formats supported by
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* cairo_format_t instead of taking a mask as a parameter.
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*
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* This function is originally from cairo:test/buffer-diff.c.
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* Copyright © 2004 Richard D. Worth
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*/
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static cairo_surface_t *
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buffer_diff_core (const guchar *buf_a,
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int stride_a,
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const guchar *buf_b,
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int stride_b,
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int width,
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int height)
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{
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int x, y;
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guchar *buf_diff = NULL;
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int stride_diff = 0;
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cairo_surface_t *diff = NULL;
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for (y = 0; y < height; y++)
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{
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const guint32 *row_a = (const guint32 *) (buf_a + y * stride_a);
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const guint32 *row_b = (const guint32 *) (buf_b + y * stride_b);
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guint32 *row = (guint32 *) (buf_diff + y * stride_diff);
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for (x = 0; x < width; x++)
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{
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int channel;
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guint32 diff_pixel = 0;
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/* check if the pixels are the same */
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if (row_a[x] == row_b[x])
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continue;
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if (diff == NULL)
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{
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diff = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
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width,
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height);
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g_assert (cairo_surface_status (diff) == CAIRO_STATUS_SUCCESS);
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buf_diff = cairo_image_surface_get_data (diff);
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stride_diff = cairo_image_surface_get_stride (diff);
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row = (guint32 *) (buf_diff + y * stride_diff);
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}
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/* calculate a difference value for all 4 channels */
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for (channel = 0; channel < 4; channel++)
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{
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int value_a = (row_a[x] >> (channel*8)) & 0xff;
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int value_b = (row_b[x] >> (channel*8)) & 0xff;
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guint diff;
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diff = ABS (value_a - value_b);
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diff *= 4; /* emphasize */
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if (diff)
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diff += 128; /* make sure it's visible */
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if (diff > 255)
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diff = 255;
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diff_pixel |= diff << (channel*8);
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}
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if ((diff_pixel & 0x00ffffff) == 0)
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{
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/* alpha only difference, convert to luminance */
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guint8 alpha = diff_pixel >> 24;
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diff_pixel = alpha * 0x010101;
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}
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row[x] = diff_pixel;
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}
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}
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return diff;
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}
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static cairo_surface_t *
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compare_surfaces (cairo_surface_t *surface1,
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cairo_surface_t *surface2)
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{
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int w1, h1, w2, h2, w, h;
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cairo_surface_t *diff;
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get_surface_size (surface1, &w1, &h1);
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get_surface_size (surface2, &w2, &h2);
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w = MAX (w1, w2);
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h = MAX (h1, h2);
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surface1 = coerce_surface_for_comparison (surface1, w, h);
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surface2 = coerce_surface_for_comparison (surface2, w, h);
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diff = buffer_diff_core (cairo_image_surface_get_data (surface1),
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cairo_image_surface_get_stride (surface1),
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cairo_image_surface_get_data (surface2),
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cairo_image_surface_get_stride (surface2),
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w, h);
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return diff;
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}
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static void
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test_ui_file (GFile *file)
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{
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@ -635,7 +488,7 @@ test_ui_file (GFile *file)
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}
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g_free (reference_file);
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diff_image = compare_surfaces (ui_image, reference_image);
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diff_image = reftest_compare_surfaces (ui_image, reference_image);
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save_image (ui_image, ui_file, ".out.png");
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save_image (reference_image, ui_file, ".ref.png");
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172
testsuite/reftests/reftest-compare.c
Normal file
172
testsuite/reftests/reftest-compare.c
Normal file
@ -0,0 +1,172 @@
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/*
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* Copyright (C) 2011 Red Hat Inc.
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*
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* Author:
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* Benjamin Otte <otte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "reftest-compare.h"
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static void
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get_surface_size (cairo_surface_t *surface,
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int *width,
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int *height)
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{
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GdkRectangle area;
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cairo_t *cr;
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cr = cairo_create (surface);
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if (!gdk_cairo_get_clip_rectangle (cr, &area))
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{
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g_assert_not_reached ();
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}
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g_assert (area.x == 0 && area.y == 0);
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g_assert (area.width > 0 && area.height > 0);
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*width = area.width;
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*height = area.height;
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}
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static cairo_surface_t *
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coerce_surface_for_comparison (cairo_surface_t *surface,
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int width,
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int height)
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{
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cairo_surface_t *coerced;
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cairo_t *cr;
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coerced = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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width,
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height);
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cr = cairo_create (coerced);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_paint (cr);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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g_assert (cairo_surface_status (coerced) == CAIRO_STATUS_SUCCESS);
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return coerced;
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}
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/* Compares two CAIRO_FORMAT_ARGB32 buffers, returning NULL if the
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* buffers are equal or a surface containing a diff between the two
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* surfaces.
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*
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* This function should be rewritten to compare all formats supported by
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* cairo_format_t instead of taking a mask as a parameter.
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*
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* This function is originally from cairo:test/buffer-diff.c.
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* Copyright © 2004 Richard D. Worth
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*/
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static cairo_surface_t *
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buffer_diff_core (const guchar *buf_a,
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int stride_a,
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const guchar *buf_b,
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int stride_b,
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int width,
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int height)
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{
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int x, y;
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guchar *buf_diff = NULL;
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int stride_diff = 0;
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cairo_surface_t *diff = NULL;
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for (y = 0; y < height; y++)
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{
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const guint32 *row_a = (const guint32 *) (buf_a + y * stride_a);
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const guint32 *row_b = (const guint32 *) (buf_b + y * stride_b);
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guint32 *row = (guint32 *) (buf_diff + y * stride_diff);
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for (x = 0; x < width; x++)
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{
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int channel;
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guint32 diff_pixel = 0;
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/* check if the pixels are the same */
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if (row_a[x] == row_b[x])
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continue;
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if (diff == NULL)
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{
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diff = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
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width,
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height);
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g_assert (cairo_surface_status (diff) == CAIRO_STATUS_SUCCESS);
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buf_diff = cairo_image_surface_get_data (diff);
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stride_diff = cairo_image_surface_get_stride (diff);
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row = (guint32 *) (buf_diff + y * stride_diff);
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}
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/* calculate a difference value for all 4 channels */
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for (channel = 0; channel < 4; channel++)
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{
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int value_a = (row_a[x] >> (channel*8)) & 0xff;
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int value_b = (row_b[x] >> (channel*8)) & 0xff;
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guint diff;
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diff = ABS (value_a - value_b);
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diff *= 4; /* emphasize */
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if (diff)
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diff += 128; /* make sure it's visible */
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if (diff > 255)
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diff = 255;
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diff_pixel |= diff << (channel*8);
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}
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if ((diff_pixel & 0x00ffffff) == 0)
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{
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/* alpha only difference, convert to luminance */
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guint8 alpha = diff_pixel >> 24;
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diff_pixel = alpha * 0x010101;
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}
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row[x] = diff_pixel;
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}
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}
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return diff;
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}
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cairo_surface_t *
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reftest_compare_surfaces (cairo_surface_t *surface1,
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cairo_surface_t *surface2)
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{
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int w1, h1, w2, h2, w, h;
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cairo_surface_t *diff;
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get_surface_size (surface1, &w1, &h1);
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get_surface_size (surface2, &w2, &h2);
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w = MAX (w1, w2);
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h = MAX (h1, h2);
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surface1 = coerce_surface_for_comparison (surface1, w, h);
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surface2 = coerce_surface_for_comparison (surface2, w, h);
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diff = buffer_diff_core (cairo_image_surface_get_data (surface1),
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cairo_image_surface_get_stride (surface1),
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cairo_image_surface_get_data (surface2),
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cairo_image_surface_get_stride (surface2),
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w, h);
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return diff;
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}
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30
testsuite/reftests/reftest-compare.h
Normal file
30
testsuite/reftests/reftest-compare.h
Normal file
@ -0,0 +1,30 @@
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/* GTK - The GIMP Toolkit
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __REFTEST_COMPARE_H__
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#define __REFTEST_COMPARE_H__
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#include <gtk/gtk.h>
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G_BEGIN_DECLS
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cairo_surface_t * reftest_compare_surfaces (cairo_surface_t *surface1,
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cairo_surface_t *surface2);
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G_END_DECLS
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#endif /* __REFTEST_COMPARE_H__ */
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