diff options
Diffstat (limited to 'libs/cairo-1.16.0/test/linear-gradient.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/linear-gradient.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/linear-gradient.c b/libs/cairo-1.16.0/test/linear-gradient.c new file mode 100644 index 0000000..054d6ab --- /dev/null +++ b/libs/cairo-1.16.0/test/linear-gradient.c @@ -0,0 +1,132 @@ +/* + * Copyright © 2005 Red Hat, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of + * Red Hat, Inc. not be used in advertising or publicity pertaining to + * distribution of the software without specific, written prior + * permission. Red Hat, Inc. makes no representations about the + * suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL, + * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Author: Owen Taylor <otaylor@redhat.com> + */ + +#include "cairo-test.h" +#include "stdio.h" + +/* The test matrix is + * + * A) Horizontal B) 5° C) 45° D) Vertical + * 1) Rotated 0° 2) Rotated 45° C) Rotated 90° + * a) 2 stop b) 3 stop + * + * A1a B1a C1a D1a + * A2a B2a C2a D2a + * A3a B3a C3a D3a + * A1b B1b C1b D1b + * A2b B2b C2b D2b + * A3b B3b C3b D3b + */ + +static const double gradient_angles[] = { 0, 45, 90 }; +#define N_GRADIENT_ANGLES 3 +static const double rotate_angles[] = { 0, 45, 90 }; +#define N_ROTATE_ANGLES 3 +static const int n_stops[] = { 2, 3 }; +#define N_N_STOPS 2 + +#define UNIT_SIZE 6 +#define UNIT_SIZE 6 +#define PAD 1 + +#define WIDTH N_GRADIENT_ANGLES * UNIT_SIZE + (N_GRADIENT_ANGLES + 1) * PAD +#define HEIGHT N_N_STOPS * N_ROTATE_ANGLES * UNIT_SIZE + (N_N_STOPS * N_ROTATE_ANGLES + 1) * PAD + +static void +draw_unit (cairo_t *cr, + double gradient_angle, + double rotate_angle, + int n_stops) +{ + cairo_pattern_t *pattern; + + cairo_rectangle (cr, 0, 0, 1, 1); + cairo_clip (cr); + cairo_new_path(cr); + + cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); + cairo_rectangle (cr, 0, 0, 1, 1); + cairo_fill (cr); + + cairo_translate (cr, 0.5, 0.5); + cairo_scale (cr, 1 / 1.5, 1 / 1.5); + cairo_rotate (cr, rotate_angle); + + pattern = cairo_pattern_create_linear (-0.5 * cos (gradient_angle), -0.5 * sin (gradient_angle), + 0.5 * cos (gradient_angle), 0.5 * sin (gradient_angle)); + + if (n_stops == 2) { + cairo_pattern_add_color_stop_rgb (pattern, 0., + 0.3, 0.3, 0.3); + cairo_pattern_add_color_stop_rgb (pattern, 1., + 1.0, 1.0, 1.0); + } else { + cairo_pattern_add_color_stop_rgb (pattern, 0., + 1.0, 0.0, 0.0); + cairo_pattern_add_color_stop_rgb (pattern, 0.5, + 1.0, 1.0, 1.0); + cairo_pattern_add_color_stop_rgb (pattern, 1., + 0.0, 0.0, 1.0); + } + + cairo_set_source (cr, pattern); + cairo_pattern_destroy (pattern); + cairo_rectangle (cr, -0.5, -0.5, 1, 1); + cairo_fill (cr); +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + int i, j, k; + + cairo_set_source_rgb (cr, 0.5, 0.5, 0.5); + cairo_paint (cr); + + for (i = 0; i < N_GRADIENT_ANGLES; i++) + for (j = 0; j < N_ROTATE_ANGLES; j++) + for (k = 0; k < N_N_STOPS; k++) { + cairo_save (cr); + cairo_translate (cr, + PAD + (PAD + UNIT_SIZE) * i, + PAD + (PAD + UNIT_SIZE) * (N_ROTATE_ANGLES * k + j)); + cairo_scale (cr, UNIT_SIZE, UNIT_SIZE); + + draw_unit (cr, + gradient_angles[i] * M_PI / 180., + rotate_angles[j] * M_PI / 180., + n_stops[k]); + cairo_restore (cr); + } + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (linear_gradient, + "Tests the drawing of linear gradients", + "gradient", /* keywords */ + NULL, /* requirements */ + WIDTH, HEIGHT, + NULL, draw) |