Grcov report - linear-gradient.c

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/*

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 * Copyright © 2005 Red Hat, Inc.

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 * Permission to use, copy, modify, distribute, and sell this software

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 * and its documentation for any purpose is hereby granted without

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 * fee, provided that the above copyright notice appear in all copies

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 * and that both that copyright notice and this permission notice

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 * appear in supporting documentation, and that the name of

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 * Red Hat, Inc. not be used in advertising or publicity pertaining to

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 * distribution of the software without specific, written prior

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 * permission. Red Hat, Inc. makes no representations about the

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 * suitability of this software for any purpose.  It is provided "as

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 * is" without express or implied warranty.

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 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

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 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

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 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,

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 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER

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 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

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 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR

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 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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 * Author: Owen Taylor <otaylor@redhat.com>

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*/

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#include "cairo-test.h"

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#include "stdio.h"

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/* The test matrix is

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 * A) Horizontal   B) 5°          C) 45°          D) Vertical

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 * 1) Rotated 0°   2) Rotated 45° C) Rotated 90°

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 * a) 2 stop       b) 3 stop

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 *  A1a   B1a  C1a  D1a

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 *  A2a   B2a  C2a  D2a

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 *  A3a   B3a  C3a  D3a

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 *  A1b   B1b  C1b  D1b

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 *  A2b   B2b  C2b  D2b

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 *  A3b   B3b  C3b  D3b

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*/

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static const double gradient_angles[] = { 0, 45, 90 };

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#define N_GRADIENT_ANGLES 3

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static const double rotate_angles[] = { 0, 45, 90 };

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#define N_ROTATE_ANGLES 3

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static const int n_stops[] = { 2, 3 };

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#define N_N_STOPS 2

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#define UNIT_SIZE 6

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#define UNIT_SIZE 6

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#define PAD 1

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#define WIDTH  N_GRADIENT_ANGLES * UNIT_SIZE + (N_GRADIENT_ANGLES + 1) * PAD

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#define HEIGHT N_N_STOPS * N_ROTATE_ANGLES * UNIT_SIZE + (N_N_STOPS * N_ROTATE_ANGLES + 1) * PAD

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static void

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draw_unit (cairo_t *cr,

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	   double   gradient_angle,

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	   double   rotate_angle,

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	   int      n_stops)

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    cairo_pattern_t *pattern;

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    cairo_rectangle (cr, 0, 0, 1, 1);

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    cairo_clip (cr);

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    cairo_new_path(cr);

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    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);

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    cairo_rectangle (cr, 0, 0, 1, 1);

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    cairo_fill (cr);

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    cairo_translate (cr, 0.5, 0.5);

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    cairo_scale (cr, 1 / 1.5, 1 / 1.5);

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    cairo_rotate (cr, rotate_angle);

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    pattern = cairo_pattern_create_linear (-0.5 * cos (gradient_angle),  -0.5 * sin (gradient_angle),

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					    0.5 * cos (gradient_angle),   0.5 * sin (gradient_angle));

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    if (n_stops == 2) {

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	cairo_pattern_add_color_stop_rgb (pattern, 0.,

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					  0.3, 0.3, 0.3);

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	cairo_pattern_add_color_stop_rgb (pattern, 1.,

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					  1.0, 1.0, 1.0);

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    } else {

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	cairo_pattern_add_color_stop_rgb (pattern, 0.,

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					  1.0, 0.0, 0.0);

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	cairo_pattern_add_color_stop_rgb (pattern, 0.5,

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					  1.0, 1.0, 1.0);

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	cairo_pattern_add_color_stop_rgb (pattern, 1.,

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					  0.0, 0.0, 1.0);

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    cairo_set_source (cr, pattern);

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    cairo_pattern_destroy (pattern);

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    cairo_rectangle (cr, -0.5, -0.5, 1, 1);

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    cairo_fill (cr);

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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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    int i, j, k;

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    cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);

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    cairo_paint (cr);

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    for (i = 0; i < N_GRADIENT_ANGLES; i++)

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	for (j = 0; j < N_ROTATE_ANGLES; j++)

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	  for (k = 0; k < N_N_STOPS; k++) {

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		cairo_save (cr);

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		cairo_translate (cr,

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				 PAD + (PAD + UNIT_SIZE) * i,

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				 PAD + (PAD + UNIT_SIZE) * (N_ROTATE_ANGLES * k + j));

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		cairo_scale (cr, UNIT_SIZE, UNIT_SIZE);

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		draw_unit (cr,

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			   gradient_angles[i] * M_PI / 180.,

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			   rotate_angles[j] * M_PI / 180.,

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			   n_stops[k]);

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		cairo_restore (cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (linear_gradient,

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	    "Tests the drawing of linear gradients",

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	    "gradient", /* keywords */

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	    NULL, /* requirements */

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	    WIDTH, HEIGHT,

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	    NULL, draw)