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/*
* Copyright © 2011 Uli Schlachter
*
* 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: Uli Schlachter <psychon@znc.in>
*/
#include "cairo-test.h"
static void path_none (cairo_t *cr, int size)
{
}
static void path_box (cairo_t *cr, int size)
{
cairo_rectangle (cr, 0, 0, size, size);
}
static void path_box_unaligned (cairo_t *cr, int size)
{
cairo_rectangle (cr, 0.5, 0.5, size - 1, size - 1);
}
static void path_triangle (cairo_t *cr, int size)
{
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, size/2, size);
cairo_line_to (cr, size, 0);
cairo_close_path (cr);
}
static void path_circle (cairo_t *cr, int size)
{
cairo_arc (cr, size / 2.0, size / 2.0, size / 2.0, 0, 2 * M_PI);
}
static void (* const path_funcs[])(cairo_t *cr, int size) = {
path_none,
path_box,
path_box_unaligned,
path_triangle,
path_circle
};
#define SIZE 20
#define PAD 2
#define TYPES 6
/* All-clipped is boring, thus we skip path_none for clipping */
#define CLIP_OFFSET 1
#define IMAGE_WIDTH ((ARRAY_LENGTH (path_funcs) - CLIP_OFFSET) * TYPES * (SIZE + PAD) - PAD)
#define IMAGE_HEIGHT (ARRAY_LENGTH (path_funcs) * (SIZE + PAD) - PAD)
static void
draw_idx (cairo_t *cr, int i, int j, int type)
{
cairo_bool_t little_path;
cairo_bool_t empty_clip;
cairo_bool_t little_clip;
/* The lowest bit controls the path, the rest the clip */
little_path = type & 1;
/* We don't want the combination "empty_clip = TRUE, little_clip = FALSE"
* (== all clipped).
*/
switch (type >> 1)
{
case 0:
empty_clip = FALSE;
little_clip = FALSE;
break;
case 1:
empty_clip = FALSE;
little_clip = TRUE;
break;
case 2:
empty_clip = TRUE;
little_clip = TRUE;
break;
default:
return;
}
cairo_save (cr);
/* Thanks to the fill rule, drawing something twice removes it again */
cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
path_funcs[i] (cr, SIZE);
if (empty_clip)
path_funcs[i] (cr, SIZE);
if (little_clip)
{
cairo_save (cr);
cairo_translate (cr, SIZE / 4, SIZE / 4);
path_funcs[i] (cr, SIZE / 2);
cairo_restore (cr);
}
cairo_clip (cr);
path_funcs[j] (cr, SIZE);
path_funcs[j] (cr, SIZE);
if (little_path)
{
/* Draw the object again in the center of itself */
cairo_save (cr);
cairo_translate (cr, SIZE / 4, SIZE / 4);
path_funcs[j] (cr, SIZE / 2);
cairo_restore (cr);
}
cairo_fill (cr);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
size_t i, j, k;
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_paint (cr);
/* Set an unbounded operator so that we can see how accurate the bounded
* extents were.
*/
cairo_set_operator (cr, CAIRO_OPERATOR_IN);
cairo_set_source_rgb (cr, 1, 1, 1);
for (j = 0; j < ARRAY_LENGTH (path_funcs); j++) {
cairo_save (cr);
for (i = CLIP_OFFSET; i < ARRAY_LENGTH (path_funcs); i++) {
for (k = 0; k < TYPES; k++) {
cairo_save (cr);
cairo_rectangle (cr, 0, 0, SIZE, SIZE);
cairo_clip (cr);
draw_idx (cr, i, j, k);
cairo_restore (cr);
cairo_translate (cr, SIZE + PAD, 0);
}
}
cairo_restore (cr);
cairo_translate (cr, 0, SIZE + PAD);
}
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (tighten_bounds,
"Tests that we tighten the bounds after tessellation.",
"fill", /* keywords */
NULL, /* requirements */
IMAGE_WIDTH, IMAGE_HEIGHT,
NULL, draw)