cairo/perf/long-lines.c

/*
 * Copyright © 2006 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: Carl D. Worth <cworth@cworth.org>
 */

#include "cairo-perf.h"

/* This test case is designed to illustrate a performance bug in
 * drawing very long lines, where most of the line is out of bounds of
 * the destination surface, (but some portion of the line is
 * visibile). These results are in the "long-lines-uncropped" report.
 *
 * For comparison, this test also renders the visible portions of the
 * same lines, (this is the "long-lines-cropped" report).
 */

typedef enum { LONG_LINES_UNCROPPED, LONG_LINES_CROPPED } long_lines_crop_t;
#define NUM_LINES    20
#define LONG_FACTOR  50.0

static cairo_perf_ticks_t
do_long_lines (cairo_t *cr, int width, int height, long_lines_crop_t crop)
{
    int i;
    double x, y, dx, dy, min_x, min_y, max_x, max_y;
    double outer_width, outer_height;

    cairo_save (cr);

    cairo_translate (cr, width / 2, height / 2);

    if (crop == LONG_LINES_UNCROPPED) {
	outer_width = LONG_FACTOR * width;
	outer_height = LONG_FACTOR * height;
	cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); /* red */
    } else {
	outer_width = width;
	outer_height = height;
	cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); /* green */
    }

    min_x = x = - outer_width / 2.0;
    min_y = y = - outer_height / 2.0;
    max_x = outer_width / 2.0;
    max_y = outer_width / 2.0;
    dx = outer_width / NUM_LINES;
    dy = outer_height / NUM_LINES;

    cairo_perf_timer_start ();

    for (i = 0; i < NUM_LINES; i++) {
	cairo_move_to (cr, 0, 0);
	cairo_line_to (cr, x, min_y);
	cairo_stroke (cr);

	cairo_move_to (cr, 0, 0);
	cairo_line_to (cr, x, max_y);
	cairo_stroke (cr);

	cairo_move_to (cr, 0, 0);
	cairo_line_to (cr, min_x, y);
	cairo_stroke (cr);

	cairo_move_to (cr, 0, 0);
	cairo_line_to (cr, max_x, y);
	cairo_stroke (cr);

	x += dx;
	y += dy;
    }

    cairo_perf_timer_stop ();

    cairo_restore (cr);

    return cairo_perf_timer_elapsed ();
}

static cairo_perf_ticks_t
long_lines_uncropped (cairo_t *cr, int width, int height)
{
    return do_long_lines (cr, width, height, LONG_LINES_UNCROPPED);
}

static cairo_perf_ticks_t
long_lines_cropped (cairo_t *cr, int width, int height)
{
    return do_long_lines (cr, width, height, LONG_LINES_CROPPED);
}

void
long_lines (cairo_perf_t *perf, cairo_t *cr, int width, int height)
{
    cairo_perf_run (perf, "long-lines-uncropped", long_lines_uncropped);
    cairo_perf_run (perf, "long-lines-cropped", long_lines_cropped);
}