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101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
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* Copyright 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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/*
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* Test the fidelity of the rasterisation, paying careful attention to rounding.
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*/
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#include "../src/cairo-fixed-type-private.h"
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#define PRECISION (int)(1 << CAIRO_FIXED_FRAC_BITS)
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#define WIDTH ((PRECISION/2+1)*3)
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#define HEIGHT ((PRECISION/2+1)*3)
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#define SUBPIXEL(v) ((v)/(double)(PRECISION/2))
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static cairo_test_status_t
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rectangles (cairo_t *cr, int width, int height)
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{
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int x, y;
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cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
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for (x = 0; x < WIDTH; x += 3) {
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for (y = 0; y < HEIGHT; y += 3) {
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cairo_rectangle (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5, .5, .5);
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}
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}
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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triangles (cairo_t *cr, int width, int height)
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{
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int x, y;
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cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
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for (x = 0; x < WIDTH; x += 3) {
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for (y = 0; y < HEIGHT; y += 3) {
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/* a rectangle with a diagonal to force tessellation */
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cairo_move_to (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5);
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cairo_rel_line_to (cr, .5, .5);
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cairo_rel_line_to (cr, 0, -.5);
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cairo_rel_line_to (cr, -.5, 0);
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cairo_rel_line_to (cr, 0, .5);
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cairo_rel_line_to (cr, .5, 0);
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}
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}
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (a1_rasterisation_rectangles,
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"Check the fidelity of the rasterisation.",
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"rasterisation", /* keywords */
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"target=raster", /* requirements */
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WIDTH, HEIGHT,
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NULL, rectangles)
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CAIRO_TEST (a1_rasterisation_triangles,
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"Check the fidelity of the rasterisation.",
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"rasterisation", /* keywords */
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"target=raster", /* requirements */
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WIDTH, HEIGHT,
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NULL, triangles)
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