| /* |
| * Copyright © 2005 Red Hat, Inc. |
| * Copyright © 2007 Emmanuel Pacaud |
| * Copyright © 2008 Benjamin Otte |
| * |
| * 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. |
| * |
| * Authors: Owen Taylor <otaylor@redhat.com> |
| * Kristian Høgsberg <krh@redhat.com> |
| * Emmanuel Pacaud <emmanuel.pacaud@lapp.in2p3.fr> |
| */ |
| |
| #include <math.h> |
| #include "cairo-test.h" |
| #include <stdio.h> |
| |
| #define STEPS 16 |
| #define START_OPERATOR CAIRO_OPERATOR_MULTIPLY |
| #define STOP_OPERATOR CAIRO_OPERATOR_HSL_LUMINOSITY |
| |
| static void |
| create_patterns (cairo_t *bg, cairo_t *fg) |
| { |
| int x; |
| |
| for (x = 0; x < STEPS; x++) { |
| /* draw a yellow background fading in using discrete steps */ |
| cairo_set_source_rgba (bg, 1, 1, 0, (double) x / (STEPS - 1)); |
| cairo_rectangle (bg, x, 0, 1, STEPS); |
| cairo_fill (bg); |
| |
| /* draw an orthogonal teal pattern fading in using discrete steps */ |
| cairo_set_source_rgba (fg, 0, 1, 1, (double) x / (STEPS - 1)); |
| cairo_rectangle (fg, 0, x, STEPS, 1); |
| cairo_fill (fg); |
| } |
| } |
| |
| /* expects a STEP*STEP pixel rectangle */ |
| static void |
| do_blend (cairo_t *cr, cairo_operator_t op, cairo_surface_t *bg, cairo_surface_t *fg) |
| { |
| /* not using CAIRO_OPERATOR_SOURCE here, it triggers a librsvg bug */ |
| cairo_set_operator (cr, CAIRO_OPERATOR_OVER); |
| cairo_set_source_surface (cr, bg, 0, 0); |
| cairo_paint (cr); |
| |
| cairo_set_operator (cr, op); |
| cairo_set_source_surface (cr, fg, 0, 0); |
| cairo_paint (cr); |
| } |
| |
| #define SIZE 5 |
| #define COUNT 4 |
| #define FULL_WIDTH ((STEPS + 1) * COUNT - 1) |
| #define FULL_HEIGHT ((COUNT + STOP_OPERATOR - START_OPERATOR) / COUNT) * (STEPS + 1) |
| |
| static cairo_test_status_t |
| draw (cairo_t *cr, int width, int height) |
| { |
| size_t i = 0; |
| cairo_operator_t op; |
| cairo_t *bgcr, *fgcr; |
| cairo_surface_t *bg, *fg; |
| |
| bg = cairo_surface_create_similar (cairo_get_target (cr), |
| CAIRO_CONTENT_COLOR_ALPHA, SIZE * STEPS, SIZE * STEPS); |
| fg = cairo_surface_create_similar (cairo_get_target (cr), |
| CAIRO_CONTENT_COLOR_ALPHA, SIZE * STEPS, SIZE * STEPS); |
| bgcr = cairo_create (bg); |
| fgcr = cairo_create (fg); |
| cairo_scale (bgcr, SIZE, SIZE); |
| cairo_scale (fgcr, SIZE, SIZE); |
| create_patterns (bgcr, fgcr); |
| cairo_destroy (bgcr); |
| cairo_destroy (fgcr); |
| |
| for (op = START_OPERATOR; op <= STOP_OPERATOR; op++, i++) { |
| cairo_save (cr); |
| cairo_translate (cr, |
| SIZE * (STEPS + 1) * (i % COUNT), |
| SIZE * (STEPS + 1) * (i / COUNT)); |
| do_blend (cr, op, bg, fg); |
| cairo_restore (cr); |
| } |
| |
| cairo_surface_destroy (fg); |
| cairo_surface_destroy (bg); |
| |
| return CAIRO_TEST_SUCCESS; |
| } |
| |
| CAIRO_TEST (extended_blend_alpha, |
| "Tests extended blend modes with alpha", |
| "operator", /* keywords */ |
| NULL, /* requirements */ |
| FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE, |
| NULL, draw) |