Grcov report - a1-rasterisation.c

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/*

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 * Copyright 2010 Intel Corporation

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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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 * 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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 * 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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 * 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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3

rectangles (cairo_t *cr, int width, int height)

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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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3

    cairo_paint (cr);

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    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);

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3

    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);

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390

    for (x = 0; x < WIDTH; x += 3) {

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50310

	for (y = 0; y < HEIGHT; y += 3) {

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49923

	    cairo_rectangle (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5, .5, .5);

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3

    cairo_fill (cr);

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    return CAIRO_TEST_SUCCESS;

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static cairo_test_status_t

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3

triangles (cairo_t *cr, int width, int height)

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    int x, y;

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3

    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);

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3

    cairo_paint (cr);

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3

    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);

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3

    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);

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    for (x = 0; x < WIDTH; x += 3) {

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50310

	for (y = 0; y < HEIGHT; y += 3) {

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	    /* a rectangle with a diagonal to force tessellation */

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49923

	    cairo_move_to (cr, x + SUBPIXEL (y/3) - .5, y + SUBPIXEL (x/3) - .5);

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49923

	    cairo_rel_line_to (cr, .5, .5);

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49923

	    cairo_rel_line_to (cr, 0, -.5);

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49923

	    cairo_rel_line_to (cr, -.5, 0);

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49923

	    cairo_rel_line_to (cr, 0, .5);

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	    cairo_rel_line_to (cr, .5, 0);

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    cairo_fill (cr);

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    return CAIRO_TEST_SUCCESS;

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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)