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authorAdrian Johnson <ajohnson@redneon.com>2010-12-24 16:43:53 +0100
committerAndrea Canciani <ranma42@gmail.com>2011-01-01 13:05:14 +0100
commita8344f98e7f4d463c85629d00420f2c8433aff9f (patch)
treeda8cca6abbda421854a5a66d385dafe43586fa8e /test/mesh-pattern-control-points.c
parentb164187ff6e8e643428165370dd53f9ac5f87bb3 (diff)
downloadcairo-a8344f98e7f4d463c85629d00420f2c8433aff9f.tar.gz
test: Add tests for mesh patterns
mesh-pattern tests a mesh pattern with non-opaque two overlapping patches. mesh-pattern-accuracy tests the accuracy of the color computed in each point of a patch. It can point out defects in rasterizers which rely on mesh subdivision only use the mesh shape instead of both shape and color to decide when the tensor-product patches can be approximated with Gouraud-shaded triangles. mesh-pattern-conical is an example of how a conical gradient can be approximated with a mesh pattern. mesh-pattern-control-points tests a mesh pattern with control points in non-default position to verify that their position affects the color as expected. mesh-pattern-fold tests a mesh pattern with a patch which folds along both sides. mesh-pattern-overlap tests a mesh pattern with a patch which folds along just one side. mesh-pattern-transformed tests a mesh pattern with non-identity transform matrix.
Diffstat (limited to 'test/mesh-pattern-control-points.c')
-rw-r--r--test/mesh-pattern-control-points.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/test/mesh-pattern-control-points.c b/test/mesh-pattern-control-points.c
new file mode 100644
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+++ b/test/mesh-pattern-control-points.c
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+/*
+ * Copyright © 2009 Adrian Johnson
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Adrian Johnson <ajohnson@redneon.com>
+ */
+
+#include "cairo-test.h"
+
+#define SIZE 90
+#define PAD 10
+#define WIDTH (PAD + 2 * (SIZE + PAD))
+#define HEIGHT (PAD + SIZE + PAD)
+
+
+/*
+ * This test is designed to paint a two mesh patches. One with default
+ * control points and one with a control point at a no default
+ * location. The control points of both of them are drawn as squares
+ * to make them visible.
+ */
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ cairo_pattern_t *pattern;
+ unsigned int i, j;
+ unsigned int num_patches;
+ double x, y;
+
+ cairo_set_source_rgb (cr, 1, 1, 1);
+ cairo_paint (cr);
+
+ cairo_translate (cr, PAD, PAD);
+
+ pattern = cairo_pattern_create_mesh ();
+ cairo_pattern_mesh_begin_patch (pattern);
+
+ cairo_pattern_mesh_move_to (pattern, 0, 0);
+ cairo_pattern_mesh_line_to (pattern, SIZE, 0);
+ cairo_pattern_mesh_line_to (pattern, SIZE, SIZE);
+ cairo_pattern_mesh_line_to (pattern, 0, SIZE);
+
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 1, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 0, 1, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 0, 0, 1);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 1, 0);
+
+ cairo_pattern_mesh_set_control_point (pattern, 0, SIZE * .7, SIZE * .7);
+ cairo_pattern_mesh_set_control_point (pattern, 1, SIZE * .9, SIZE * .7);
+ cairo_pattern_mesh_set_control_point (pattern, 2, SIZE * .9, SIZE * .9);
+ cairo_pattern_mesh_set_control_point (pattern, 3, SIZE * .7, SIZE * .9);
+
+ cairo_pattern_mesh_end_patch (pattern);
+
+ cairo_pattern_mesh_begin_patch (pattern);
+
+ cairo_pattern_mesh_move_to (pattern, SIZE + PAD, 0);
+ cairo_pattern_mesh_line_to (pattern, 2*SIZE + PAD, 0);
+ cairo_pattern_mesh_line_to (pattern, 2*SIZE + PAD, SIZE);
+ cairo_pattern_mesh_line_to (pattern, SIZE + PAD, SIZE);
+
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 1, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 0, 1, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 0, 0, 1);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 1, 0);
+
+ cairo_pattern_mesh_end_patch (pattern);
+
+ cairo_set_source (cr, pattern);
+ cairo_paint (cr);
+
+ /* mark the location of the control points */
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_pattern_mesh_get_patch_count (pattern, &num_patches);
+ for (i = 0; i < num_patches; i++) {
+ for (j = 0; j < 4; j++) {
+ cairo_pattern_mesh_get_control_point (pattern, i, j, &x, &y);
+ cairo_rectangle (cr, x - 5, y - 5, 10, 10);
+ cairo_fill (cr);
+ }
+ }
+
+ cairo_pattern_destroy (pattern);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+
+CAIRO_TEST (mesh_pattern_control_points,
+ "Paint mesh pattern with non default control points",
+ "mesh,pattern", /* keywords */
+ NULL, /* requirements */
+ WIDTH, HEIGHT,
+ NULL, draw)