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/*
* Copyright 2010 Intel Corporation
*
* 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: Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "cairo-test.h"
/*
* Test the fidelity of the rasterisation, paying careful attention to rounding.
*/
#include "../src/cairo-fixed-type-private.h"
#define PRECISION (int)(1 << CAIRO_FIXED_FRAC_BITS)
#define WIDTH ((PRECISION/2+1)*3)
#define HEIGHT ((PRECISION/2+1)*3)
#define SUBPIXEL(v) ((v)/(double)(PRECISION/2))
static cairo_test_status_t
rectangles (cairo_t *cr, int width, int height)
{
int x, y;
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
for (x = 0; x < WIDTH; x += 3) {
for (y = 0; y < HEIGHT; y += 3) {
cairo_rectangle (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5, .5, .5);
}
}
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
triangles (cairo_t *cr, int width, int height)
{
int x, y;
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
for (x = 0; x < WIDTH; x += 3) {
for (y = 0; y < HEIGHT; y += 3) {
/* a rectangle with a diagonal to force tessellation */
cairo_move_to (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5);
cairo_rel_line_to (cr, .5, .5);
cairo_rel_line_to (cr, 0, -.5);
cairo_rel_line_to (cr, -.5, 0);
cairo_rel_line_to (cr, 0, .5);
cairo_rel_line_to (cr, .5, 0);
}
}
cairo_fill (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (a1_rasterisation_rectangles,
"Check the fidelity of the rasterisation.",
"rasterisation", /* keywords */
"target=raster", /* requirements */
WIDTH, HEIGHT,
NULL, rectangles)
CAIRO_TEST (a1_rasterisation_triangles,
"Check the fidelity of the rasterisation.",
"rasterisation", /* keywords */
"target=raster", /* requirements */
WIDTH, HEIGHT,
NULL, triangles)