cairo/perf/long-lines.c

   1 /*
   2  * Copyright © 2006 Red Hat, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  * Author: Carl D. Worth <cworth@cworth.org>
  25  */
  26
  27 #include "cairo-perf.h"
  28
  29 /* This test case is designed to illustrate a performance bug in
  30  * drawing very long lines, where most of the line is out of bounds of
  31  * the destination surface, (but some portion of the line is
  32  * visibile). These results are in the "long-lines-uncropped" report.
  33  *
  34  * For comparison, this test also renders the visible portions of the
  35  * same lines, (this is the "long-lines-cropped" report).
  36  */
  37
  38 typedef enum { LONG_LINES_UNCROPPED, LONG_LINES_CROPPED } long_lines_crop_t;
  39 #define NUM_LINES    20
  40 #define LONG_FACTOR  50.0
  41
  42 static cairo_perf_ticks_t
  43 do_long_lines (cairo_t *cr, int width, int height, long_lines_crop_t crop)
  44 {
  45     int i;
  46     double x, y, dx, dy, min_x, min_y, max_x, max_y;
  47     double outer_width, outer_height;
  48
  49     cairo_save (cr);
  50
  51     cairo_translate (cr, width / 2, height / 2);
  52
  53     if (crop == LONG_LINES_UNCROPPED) {
  54         outer_width = LONG_FACTOR * width;
  55         outer_height = LONG_FACTOR * height;
  56         cairo_set_source_rgb (cr, 1.0, 0.0, 0.0); /* red */
  57     } else {
  58         outer_width = width;
  59         outer_height = height;
  60         cairo_set_source_rgb (cr, 0.0, 1.0, 0.0); /* green */
  61     }
  62
  63     min_x = x = - outer_width / 2.0;
  64     min_y = y = - outer_height / 2.0;
  65     max_x = outer_width / 2.0;
  66     max_y = outer_width / 2.0;
  67     dx = outer_width / NUM_LINES;
  68     dy = outer_height / NUM_LINES;
  69
  70     cairo_perf_timer_start ();
  71
  72     for (i = 0; i < NUM_LINES; i++) {
  73         cairo_move_to (cr, 0, 0);
  74         cairo_line_to (cr, x, min_y);
  75         cairo_stroke (cr);
  76
  77         cairo_move_to (cr, 0, 0);
  78         cairo_line_to (cr, x, max_y);
  79         cairo_stroke (cr);
  80
  81         cairo_move_to (cr, 0, 0);
  82         cairo_line_to (cr, min_x, y);
  83         cairo_stroke (cr);
  84
  85         cairo_move_to (cr, 0, 0);
  86         cairo_line_to (cr, max_x, y);
  87         cairo_stroke (cr);
  88
  89         x += dx;
  90         y += dy;
  91     }
  92
  93     cairo_perf_timer_stop ();
  94
  95     cairo_restore (cr);
  96
  97     return cairo_perf_timer_elapsed ();
  98 }
  99
 100 static cairo_perf_ticks_t
 101 long_lines_uncropped (cairo_t *cr, int width, int height)
 102 {
 103     return do_long_lines (cr, width, height, LONG_LINES_UNCROPPED);
 104 }
 105
 106 static cairo_perf_ticks_t
 107 long_lines_cropped (cairo_t *cr, int width, int height)
 108 {
 109     return do_long_lines (cr, width, height, LONG_LINES_CROPPED);
 110 }
 111
 112 void
 113 long_lines (cairo_perf_t *perf, cairo_t *cr, int width, int height)
 114 {
 115     cairo_perf_run (perf, "long-lines-uncropped", long_lines_uncropped);
 116     cairo_perf_run (perf, "long-lines-cropped", long_lines_cropped);
 117 }