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/*
* 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)
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