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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,
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);
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_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_translate (cr, 0, 1);
return CAIRO_TEST_SUCCESS;
composite_simple (cairo_t *cr, cairo_pattern_t *pattern)
cairo_set_source (cr, pattern);
cairo_paint (cr);
composite_mask (cairo_t *cr, cairo_pattern_t *pattern)
cairo_set_source_rgb (cr, 1, 0, 1);
cairo_mask (cr, pattern);
draw_simple (cairo_t *cr, int width, int height)
cairo_test_paint_checkered (cr);
return draw (cr, pattern_add_stops, composite_simple);
draw_mask (cairo_t *cr, int width, int height)
return draw (cr, pattern_add_stops, composite_mask);
draw_source (cairo_t *cr, int width, int height)
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
draw_mask_source (cairo_t *cr, int width, int height)
draw_one_stop (cairo_t *cr, int width, int height)
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, draw_mask)
CAIRO_TEST (radial_gradient_source,
"Simple test of radial gradients using the SOURCE operator",
"gradient,source", /* keywords */
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, draw_mask_source)
CAIRO_TEST (radial_gradient_one_stop,
"Tests radial gradients with a single stop",
"gradient,radial", /* keywords */
NULL, draw_one_stop)