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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-accuracy.c
parentb164187ff6e8e643428165370dd53f9ac5f87bb3 (diff)
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-accuracy.c')
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diff --git a/test/mesh-pattern-accuracy.c b/test/mesh-pattern-accuracy.c
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+++ b/test/mesh-pattern-accuracy.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"
+#include <float.h>
+
+#define SIZE 256
+
+/* This test is designed to test the accuracy of the rendering of mesh
+ * patterns.
+ *
+ * Color accuracy is tested by a square patch covering the whole
+ * surface with black and white corners.
+ *
+ * Extents accuracy is checked by a small red square patch at the
+ * center of the surface which should measure 2x2 pixels.
+ */
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ cairo_pattern_t *pattern;
+ double offset;
+
+ cairo_test_paint_checkered (cr);
+
+ 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, 1, 0);
+ cairo_pattern_mesh_line_to (pattern, 1, 1);
+ cairo_pattern_mesh_line_to (pattern, 0, 1);
+
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 0, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 1, 1, 1);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 0, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 1, 1);
+
+ cairo_pattern_mesh_end_patch (pattern);
+
+ cairo_pattern_mesh_begin_patch (pattern);
+
+ /* A small 1x1 red patch, that should be rendered as a 2x2 red
+ * square in the center of the image */
+
+ offset = 0.5 / SIZE;
+
+ cairo_pattern_mesh_move_to (pattern, 0.5 + offset, 0.5 + offset);
+ cairo_pattern_mesh_line_to (pattern, 0.5 + offset, 0.5 - offset);
+ cairo_pattern_mesh_line_to (pattern, 0.5 - offset, 0.5 - offset);
+ cairo_pattern_mesh_line_to (pattern, 0.5 - offset, 0.5 + offset);
+
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 0, 1, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 1, 1, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 2, 1, 0, 0);
+ cairo_pattern_mesh_set_corner_color_rgb (pattern, 3, 1, 0, 0);
+
+ cairo_pattern_mesh_end_patch (pattern);
+
+ cairo_scale (cr, SIZE, SIZE);
+
+ cairo_set_source (cr, pattern);
+ cairo_paint (cr);
+ cairo_pattern_destroy (pattern);
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (mesh_pattern_accuracy,
+ "Paint mesh pattern",
+ "mesh,pattern", /* keywords */
+ NULL, /* requirements */
+ SIZE, SIZE,
+ NULL, draw)