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+/*
+ * Copyright © 2005 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: Owen Taylor <otaylor@redhat.com>
+ */
+
+#include "cairo-test.h"
+#include "stdio.h"
+
+/* The test matrix is
+ *
+ * A) Horizontal B) 5° C) 45° D) Vertical
+ * 1) Rotated 0° 2) Rotated 45° C) Rotated 90°
+ * a) 2 stop b) 3 stop
+ *
+ * A1a B1a C1a D1a
+ * A2a B2a C2a D2a
+ * A3a B3a C3a D3a
+ * A1b B1b C1b D1b
+ * A2b B2b C2b D2b
+ * A3b B3b C3b D3b
+ */
+
+static const double gradient_angles[] = { 0, 45, 90 };
+#define N_GRADIENT_ANGLES 3
+static const double rotate_angles[] = { 0, 45, 90 };
+#define N_ROTATE_ANGLES 3
+static const int n_stops[] = { 2, 3 };
+#define N_N_STOPS 2
+
+#define UNIT_SIZE 6
+#define UNIT_SIZE 6
+#define PAD 1
+
+#define WIDTH N_GRADIENT_ANGLES * UNIT_SIZE + (N_GRADIENT_ANGLES + 1) * PAD
+#define HEIGHT N_N_STOPS * N_ROTATE_ANGLES * UNIT_SIZE + (N_N_STOPS * N_ROTATE_ANGLES + 1) * PAD
+
+static void
+draw_unit (cairo_t *cr,
+ double gradient_angle,
+ double rotate_angle,
+ int n_stops)
+{
+ cairo_pattern_t *pattern;
+
+ cairo_rectangle (cr, 0, 0, 1, 1);
+ cairo_clip (cr);
+ cairo_new_path(cr);
+
+ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ cairo_rectangle (cr, 0, 0, 1, 1);
+ cairo_fill (cr);
+
+ cairo_translate (cr, 0.5, 0.5);
+ cairo_scale (cr, 1 / 1.5, 1 / 1.5);
+ cairo_rotate (cr, rotate_angle);
+
+ pattern = cairo_pattern_create_linear (-0.5 * cos (gradient_angle), -0.5 * sin (gradient_angle),
+ 0.5 * cos (gradient_angle), 0.5 * sin (gradient_angle));
+
+ if (n_stops == 2) {
+ cairo_pattern_add_color_stop_rgb (pattern, 0.,
+ 0.3, 0.3, 0.3);
+ cairo_pattern_add_color_stop_rgb (pattern, 1.,
+ 1.0, 1.0, 1.0);
+ } else {
+ cairo_pattern_add_color_stop_rgb (pattern, 0.,
+ 1.0, 0.0, 0.0);
+ cairo_pattern_add_color_stop_rgb (pattern, 0.5,
+ 1.0, 1.0, 1.0);
+ cairo_pattern_add_color_stop_rgb (pattern, 1.,
+ 0.0, 0.0, 1.0);
+ }
+
+ cairo_set_source (cr, pattern);
+ cairo_pattern_destroy (pattern);
+ cairo_rectangle (cr, -0.5, -0.5, 1, 1);
+ cairo_fill (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ int i, j, k;
+
+ cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
+ cairo_paint (cr);
+
+ for (i = 0; i < N_GRADIENT_ANGLES; i++)
+ for (j = 0; j < N_ROTATE_ANGLES; j++)
+ for (k = 0; k < N_N_STOPS; k++) {
+ cairo_save (cr);
+ cairo_translate (cr,
+ PAD + (PAD + UNIT_SIZE) * i,
+ PAD + (PAD + UNIT_SIZE) * (N_ROTATE_ANGLES * k + j));
+ cairo_scale (cr, UNIT_SIZE, UNIT_SIZE);
+
+ draw_unit (cr,
+ gradient_angles[i] * M_PI / 180.,
+ rotate_angles[j] * M_PI / 180.,
+ n_stops[k]);
+ cairo_restore (cr);
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (linear_gradient,
+ "Tests the drawing of linear gradients",
+ "gradient", /* keywords */
+ NULL, /* requirements */
+ WIDTH, HEIGHT,
+ NULL, draw)