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/*
* Copyright © 2010 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Author: Benjamin Otte <otte@gnome.org>
*/
#include "cairo-test.h"
#define RECT 10
#define SPACE 5
static void
paint_with_alpha (cairo_t *cr)
{
cairo_paint_with_alpha (cr, 0.0);
}
static void
mask_with_solid (cairo_t *cr)
{
cairo_pattern_t *pattern = cairo_pattern_create_rgba (1, 0, 0, 0);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
}
static void
mask_with_empty_gradient (cairo_t *cr)
{
cairo_pattern_t *pattern = cairo_pattern_create_linear (1, 2, 3, 4);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
}
static void
mask_with_gradient (cairo_t *cr)
{
cairo_pattern_t *pattern = cairo_pattern_create_radial (1, 2, 3, 4, 5, 6);
cairo_pattern_add_color_stop_rgba (pattern, 0, 1, 0, 0, 0);
cairo_pattern_add_color_stop_rgba (pattern, 0, 0, 0, 1, 0);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
}
static void
mask_with_surface (cairo_t *cr)
{
cairo_surface_t *surface = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
RECT,
RECT);
cairo_mask_surface (cr, surface, 0, 0);
cairo_surface_destroy (surface);
}
static void
mask_with_alpha_surface (cairo_t *cr)
{
cairo_surface_t *surface = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_ALPHA,
RECT / 2,
RECT / 2);
cairo_pattern_t *pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
}
static void
mask_with_nonclear_surface (cairo_t *cr)
{
static unsigned char data[8 * 4] = { 0, };
cairo_surface_t *surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_A1,
16, 8, 4);
cairo_mask_surface (cr, surface, 0, 0);
cairo_surface_destroy (surface);
}
static void
mask_with_0x0_surface (cairo_t *cr)
{
cairo_surface_t *surface = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
0, 0);
cairo_mask_surface (cr, surface, 0, 0);
cairo_surface_destroy (surface);
}
static void
mask_with_extend_none (cairo_t *cr)
{
cairo_surface_t *surface = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
RECT,
RECT);
cairo_mask_surface (cr, surface, 2 * RECT, 2 * RECT);
cairo_surface_destroy (surface);
}
typedef void (* mask_func_t) (cairo_t *);
static mask_func_t mask_funcs[] = {
paint_with_alpha,
mask_with_solid,
mask_with_empty_gradient,
mask_with_gradient,
mask_with_surface,
mask_with_alpha_surface,
mask_with_nonclear_surface,
mask_with_0x0_surface,
mask_with_extend_none
};
static cairo_operator_t operators[] = {
CAIRO_OPERATOR_CLEAR,
CAIRO_OPERATOR_SOURCE,
CAIRO_OPERATOR_OVER,
CAIRO_OPERATOR_IN,
CAIRO_OPERATOR_DEST_ATOP,
CAIRO_OPERATOR_SATURATE,
CAIRO_OPERATOR_MULTIPLY
};
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
unsigned int i, op;
/* 565-compatible gray background */
cairo_set_source_rgb (cr, 0.51613, 0.55555, 0.51613);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); /* green */
/* mask with zero-alpha in several ways */
cairo_translate (cr, SPACE, SPACE);
for (op = 0; op < ARRAY_LENGTH (operators); op++) {
cairo_set_operator (cr, operators[op]);
for (i = 0; i < ARRAY_LENGTH (mask_funcs); i++) {
cairo_save (cr);
cairo_translate (cr, i * (RECT + SPACE), op * (RECT + SPACE));
cairo_rectangle (cr, 0, 0, RECT, RECT);
cairo_clip (cr);
mask_funcs[i] (cr);
cairo_restore (cr);
}
}
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (zero_mask,
"Testing that masking with zero alpha works",
"alpha, mask", /* keywords */
NULL, /* requirements */
SPACE + (RECT + SPACE) * ARRAY_LENGTH (mask_funcs),
SPACE + (RECT + SPACE) * ARRAY_LENGTH (operators),
NULL, draw)