/*
* 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 "cairo-test.h"
#include <math.h>
#include <stdio.h>
#define STEPS 16
#define START_OPERATOR CAIRO_OPERATOR_MULTIPLY
#define STOP_OPERATOR CAIRO_OPERATOR_HSL_LUMINOSITY
#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 void
set_solid_pattern (cairo_t *cr,
int step,
cairo_bool_t bg,
cairo_bool_t alpha)
{
double c, a;
a = ((double) step) / (STEPS - 1);
if (alpha) {
c = 1;
} else {
c = a;
a = 1;
}
if (bg) /* draw a yellow background fading in using discrete steps */
cairo_set_source_rgba (cr, c, c, 0, a);
else /* draw a teal foreground pattern fading in using discrete steps */
cairo_set_source_rgba (cr, 0, c, c, a);
}
/* expects a STEP*STEP pixel rectangle */
static void
do_blend_solid (cairo_t *cr, cairo_operator_t op, cairo_bool_t alpha)
{
int x;
cairo_save (cr);
cairo_scale (cr, SIZE, SIZE);
/* not using CAIRO_OPERATOR_SOURCE here, it triggers a librsvg bug */
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
for (x = 0; x < STEPS; x++) {
/* draw the background using discrete steps */
set_solid_pattern (cr, x, TRUE, alpha);
cairo_rectangle (cr, x, 0, 1, STEPS);
cairo_fill (cr);
}
cairo_set_operator (cr, op);
for (x = 0; x < STEPS; x++) {
/* draw an orthogonal foreground pattern using discrete steps */
set_solid_pattern (cr, x, FALSE, alpha);
cairo_rectangle (cr, 0, x, STEPS, 1);
cairo_fill (cr);
}
cairo_restore (cr);
}
static void
create_patterns (cairo_t *cr,
cairo_surface_t **bg,
cairo_surface_t **fg,
cairo_bool_t alpha)
{
cairo_t *bgcr, *fgcr;
*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);
do_blend_solid (bgcr, CAIRO_OPERATOR_DEST, alpha);
do_blend_solid (fgcr, CAIRO_OPERATOR_SOURCE, alpha);
cairo_destroy (bgcr);
cairo_destroy (fgcr);
}
/* expects a STEP*STEP pixel rectangle */
static void
do_blend (cairo_t *cr, cairo_operator_t op, cairo_bool_t alpha)
{
cairo_surface_t *bg, *fg;
create_patterns (cr, &bg, &fg, alpha);
/* 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);
cairo_surface_destroy (fg);
cairo_surface_destroy (bg);
}
static void
do_blend_mask (cairo_t *cr, cairo_operator_t op, cairo_bool_t alpha)
{
cairo_surface_t *bg, *fg;
create_patterns (cr, &bg, &fg, alpha);
/* 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_with_alpha (cr, .5);
cairo_surface_destroy (fg);
cairo_surface_destroy (bg);
}
static cairo_test_status_t
draw (cairo_t *cr, cairo_bool_t alpha,
void (*blend)(cairo_t *, cairo_operator_t, cairo_bool_t))
{
size_t i = 0;
cairo_operator_t op;
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));
blend (cr, op, alpha);
cairo_restore (cr);
}
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
draw_extended_blend (cairo_t *cr, int width, int height)
{
return draw (cr, FALSE, do_blend);
}
static cairo_test_status_t
draw_extended_blend_alpha (cairo_t *cr, int width, int height)
{
return draw (cr, TRUE, do_blend);
}
static cairo_test_status_t
draw_extended_blend_solid (cairo_t *cr, int width, int height)
{
return draw (cr, FALSE, do_blend_solid);
}
static cairo_test_status_t
draw_extended_blend_solid_alpha (cairo_t *cr, int width, int height)
{
return draw (cr, TRUE, do_blend_solid);
}
static cairo_test_status_t
draw_extended_blend_mask (cairo_t *cr, int width, int height)
{
return draw (cr, FALSE, do_blend_mask);
}
static cairo_test_status_t
draw_extended_blend_alpha_mask (cairo_t *cr, int width, int height)
{
return draw (cr, TRUE, do_blend_mask);
}
CAIRO_TEST (extended_blend,
"Tests extended blend modes without alpha",
"operator", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend)
CAIRO_TEST (extended_blend_alpha,
"Tests extended blend modes with alpha",
"operator", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend_alpha)
CAIRO_TEST (extended_blend_mask,
"Tests extended blend modes with an alpha mask",
"operator,mask", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend_mask)
CAIRO_TEST (extended_blend_alpha_mask,
"Tests extended blend modes with an alpha mask",
"operator,mask", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend_alpha_mask)
CAIRO_TEST (extended_blend_solid,
"Tests extended blend modes on solid patterns without alpha",
"operator", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend_solid)
CAIRO_TEST (extended_blend_solid_alpha,
"Tests extended blend modes on solid patterns with alpha",
"operator", /* keywords */
NULL, /* requirements */
FULL_WIDTH * SIZE, FULL_HEIGHT * SIZE,
NULL, draw_extended_blend_solid_alpha)