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-rw-r--r--test/radial-gradient.c256
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diff --git a/test/radial-gradient.c b/test/radial-gradient.c
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-/*
- * Copyright © 2005, 2007 Red Hat, Inc.
- *
- * 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: Carl D. Worth <cworth@cworth.org>
- */
-
-#include "cairo-test.h"
-
-#define NUM_GRADIENTS 7
-#define NUM_EXTEND 4
-#define SIZE 120
-#define WIDTH (SIZE * NUM_GRADIENTS)
-#define HEIGHT (SIZE * NUM_EXTEND)
-
-typedef void (*composite_t)(cairo_t *cr, cairo_pattern_t *pattern);
-typedef void (*add_stops_t)(cairo_pattern_t *pattern);
-
-/*
- * We want to test all the possible relative positions of the start
- * and end circle:
- *
- * - The start circle can be smaller/equal/bigger than the end
- * circle. A radial gradient can be classified in one of these
- * three cases depending on the sign of dr.
- *
- * - The smaller circle can be completely inside/internally
- * tangent/outside (at least in part) of the bigger circle. This
- * classification is the same as the one which can be computed by
- * examining the sign of a = (dx^2 + dy^2 - dr^2).
- *
- * - If the two circles have the same size, neither can be inside or
- * internally tangent
- *
- * This test draws radial gradients whose circles always have the same
- * centers (0, 0) and (1, 0), but with different radiuses. From left
- * to right:
- *
- * - Small start circle completely inside the end circle
- * 0.25 -> 1.75; dr = 1.5 > 0; a = 1 - 1.50^2 < 0
- *
- * - Small start circle internally tangent to the end circle
- * 0.50 -> 1.50; dr = 1.0 > 0; a = 1 - 1.00^2 = 0
- *
- * - Small start circle outside of the end circle
- * 0.50 -> 1.00; dr = 0.5 > 0; a = 1 - 0.50^2 > 0
- *
- * - Start circle with the same size as the end circle
- * 1.00 -> 1.00; dr = 0.0 = 0; a = 1 - 0.00^2 > 0
- *
- * - Small end circle outside of the start circle
- * 1.00 -> 0.50; dr = -0.5 > 0; a = 1 - 0.50^2 > 0
- *
- * - Small end circle internally tangent to the start circle
- * 1.50 -> 0.50; dr = -1.0 > 0; a = 1 - 1.00^2 = 0
- *
- * - Small end circle completely inside the start circle
- * 1.75 -> 0.25; dr = -1.5 > 0; a = 1 - 1.50^2 < 0
- *
- */
-
-static const double radiuses[NUM_GRADIENTS] = {
- 0.25,
- 0.50,
- 0.50,
- 1.00,
- 1.00,
- 1.50,
- 1.75
-};
-
-static cairo_pattern_t *
-create_pattern (int index)
-{
- double x0, x1, radius0, radius1, left, right, center;
-
- x0 = 0;
- x1 = 1;
- radius0 = radiuses[index];
- radius1 = radiuses[NUM_GRADIENTS - index - 1];
-
- /* center the gradient */
- left = MIN (x0 - radius0, x1 - radius1);
- right = MAX (x0 + radius0, x1 + radius1);
- center = (left + right) * 0.5;
- x0 -= center;
- x1 -= center;
-
- /* scale to make it fit within a 1x1 rect centered in (0,0) */
- x0 *= 0.25;
- x1 *= 0.25;
- radius0 *= 0.25;
- radius1 *= 0.25;
-
- return cairo_pattern_create_radial (x0, 0, radius0, x1, 0, radius1);
-}
-
-static void
-pattern_add_stops (cairo_pattern_t *pattern)
-{
- cairo_pattern_add_color_stop_rgba (pattern, 0.0, 1, 0, 0, 0.75);
- cairo_pattern_add_color_stop_rgba (pattern, sqrt (0.5), 0, 1, 0, 0);
- cairo_pattern_add_color_stop_rgba (pattern, 1.0, 0, 0, 1, 1);
-}
-
-static void
-pattern_add_single_stop (cairo_pattern_t *pattern)
-{
- cairo_pattern_add_color_stop_rgba (pattern, 0.25, 1, 0, 0, 1);
-}
-
-
-static cairo_test_status_t
-draw (cairo_t *cr, add_stops_t add_stops, composite_t composite)
-{
- int i, j;
- cairo_extend_t extend[NUM_EXTEND] = {
- CAIRO_EXTEND_NONE,
- CAIRO_EXTEND_REPEAT,
- CAIRO_EXTEND_REFLECT,
- CAIRO_EXTEND_PAD
- };
-
- cairo_scale (cr, SIZE, SIZE);
- cairo_translate (cr, 0.5, 0.5);
-
- for (j = 0; j < NUM_EXTEND; j++) {
- cairo_save (cr);
- for (i = 0; i < NUM_GRADIENTS; i++) {
- cairo_pattern_t *pattern;
-
- pattern = create_pattern (i);
- add_stops (pattern);
- cairo_pattern_set_extend (pattern, extend[j]);
-
- cairo_save (cr);
- cairo_rectangle (cr, -0.5, -0.5, 1, 1);
- cairo_clip (cr);
- composite (cr, pattern);
- cairo_restore (cr);
- cairo_pattern_destroy (pattern);
-
- cairo_translate (cr, 1, 0);
- }
- cairo_restore (cr);
- cairo_translate (cr, 0, 1);
- }
-
- return CAIRO_TEST_SUCCESS;
-}
-
-
-static void
-composite_simple (cairo_t *cr, cairo_pattern_t *pattern)
-{
- cairo_set_source (cr, pattern);
- cairo_paint (cr);
-}
-
-static void
-composite_mask (cairo_t *cr, cairo_pattern_t *pattern)
-{
- cairo_set_source_rgb (cr, 1, 0, 1);
- cairo_mask (cr, pattern);
-}
-
-
-static cairo_test_status_t
-draw_simple (cairo_t *cr, int width, int height)
-{
- cairo_test_paint_checkered (cr);
- return draw (cr, pattern_add_stops, composite_simple);
-}
-
-static cairo_test_status_t
-draw_mask (cairo_t *cr, int width, int height)
-{
- cairo_test_paint_checkered (cr);
- return draw (cr, pattern_add_stops, composite_mask);
-}
-
-static cairo_test_status_t
-draw_source (cairo_t *cr, int width, int height)
-{
- cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
- return draw (cr, pattern_add_stops, composite_simple);
-}
-
-
-static cairo_test_status_t
-draw_mask_source (cairo_t *cr, int width, int height)
-{
- cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
- return draw (cr, pattern_add_stops, composite_mask);
-}
-
-static cairo_test_status_t
-draw_one_stop (cairo_t *cr, int width, int height)
-{
- cairo_test_paint_checkered (cr);
- return draw (cr, pattern_add_single_stop, composite_simple);
-}
-
-CAIRO_TEST (radial_gradient,
- "Simple test of radial gradients",
- "gradient", /* keywords */
- NULL, /* requirements */
- WIDTH, HEIGHT,
- NULL, draw_simple)
-
-CAIRO_TEST (radial_gradient_mask,
- "Simple test of radial gradients using a MASK",
- "gradient,mask", /* keywords */
- NULL, /* requirements */
- WIDTH, HEIGHT,
- NULL, draw_mask)
-
-CAIRO_TEST (radial_gradient_source,
- "Simple test of radial gradients using the SOURCE operator",
- "gradient,source", /* keywords */
- NULL, /* requirements */
- WIDTH, HEIGHT,
- NULL, draw_source)
-
-CAIRO_TEST (radial_gradient_mask_source,
- "Simple test of radial gradients using a MASK with a SOURCE operator",
- "gradient,mask,source", /* keywords */
- NULL, /* requirements */
- WIDTH, HEIGHT,
- NULL, draw_mask_source)
-
-CAIRO_TEST (radial_gradient_one_stop,
- "Tests radial gradients with a single stop",
- "gradient,radial", /* keywords */
- NULL, /* requirements */
- WIDTH, HEIGHT,
- NULL, draw_one_stop)
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