Grcov report - mesh-pattern-conical.c

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/*

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 * Copyright © 2009 Adrian Johnson

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 * Permission is hereby granted, free of charge, to any person

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 * obtaining a copy of this software and associated documentation

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 * files (the "Software"), to deal in the Software without

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 * restriction, including without limitation the rights to use, copy,

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 * modify, merge, publish, distribute, sublicense, and/or sell copies

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 * of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 * The above copyright notice and this permission notice shall be

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 * included in all copies or substantial portions of the Software.

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

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 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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 * Author: Adrian Johnson <ajohnson@redneon.com>

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*/

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#include "cairo-test.h"

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#include <math.h>

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#define PAT_WIDTH  100

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#define PAT_HEIGHT 100

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#define SIZE PAT_WIDTH

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#define PAD 2

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#define WIDTH (PAD + SIZE + PAD)

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#define HEIGHT WIDTH

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/*

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 * This test is designed to paint a mesh pattern which contains 8

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 * circular sectors approximating a conical gradient.

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*/

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#define CENTER_X 50

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#define CENTER_Y 50

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#define RADIUS   50

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static void

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sector_patch (cairo_pattern_t *pattern,

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	      double angle_A,

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	      double A_r, double A_g, double A_b,

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	      double angle_B,

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	      double B_r, double B_g, double B_b)

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    double r_sin_A, r_cos_A;

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    double r_sin_B, r_cos_B;

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    double h;

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    r_sin_A = RADIUS * sin (angle_A);

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    r_cos_A = RADIUS * cos (angle_A);

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    r_sin_B = RADIUS * sin (angle_B);

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    r_cos_B = RADIUS * cos (angle_B);

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    h = 4.0/3.0 * tan ((angle_B - angle_A) / 4.0);

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    cairo_mesh_pattern_begin_patch (pattern);

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    cairo_mesh_pattern_move_to (pattern, CENTER_X, CENTER_Y);

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    cairo_mesh_pattern_line_to (pattern,

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				CENTER_X + r_cos_A,

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				CENTER_Y + r_sin_A);

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    cairo_mesh_pattern_curve_to (pattern,

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				 CENTER_X + r_cos_A - h * r_sin_A,

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				 CENTER_Y + r_sin_A + h * r_cos_A,

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				 CENTER_X + r_cos_B + h * r_sin_B,

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				 CENTER_Y + r_sin_B - h * r_cos_B,

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				 CENTER_X + r_cos_B,

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				 CENTER_Y + r_sin_B);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 0, 1, 1, 1);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 1, A_r, A_g, A_b);

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    cairo_mesh_pattern_set_corner_color_rgb (pattern, 2, B_r, B_g, B_b);

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    cairo_mesh_pattern_end_patch (pattern);

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    cairo_pattern_t *pattern;

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    cairo_set_source_rgb (cr, 1, 1, 1);

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    cairo_paint (cr);

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    cairo_translate (cr, PAD, PAD);

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    pattern = cairo_pattern_create_mesh ();

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    sector_patch (pattern,

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		  0,         1, 0, 0,

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		  M_PI/4,    1, 1, 0);

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    sector_patch (pattern,

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		  M_PI/4,    0, 1, 0,

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		  M_PI/2,    0, 1, 1);

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    sector_patch (pattern,

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		  M_PI/2,    0, 0, 1,

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		  3*M_PI/4,  1, 0, 1);

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3

    sector_patch (pattern,

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		  3*M_PI/4,  1, 0, 0,

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		  M_PI,      1, 1, 0);

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    sector_patch (pattern,

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		  -M_PI,     1, 1, 0,

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		  -3*M_PI/4, 0, 1, 0);

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    sector_patch (pattern,

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		  -3*M_PI/4, 0, 1, 0,

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		  -M_PI/2,   0, 1, 1);

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    sector_patch (pattern,

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		  -M_PI/2,   0, 1, 1,

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		  -M_PI/4,   0, 0, 1);

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    sector_patch (pattern,

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		  -M_PI/4,   0, 0, 1,

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		  0,         1, 0, 0);

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    cairo_set_source (cr, pattern);

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    cairo_paint (cr);

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    cairo_pattern_destroy (pattern);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (mesh_pattern_conical,

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	    "Paint a conical pattern using a mesh pattern",

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	    "conical, mesh, pattern", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)