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af9fbd176b
Having spent the last dev cycle looking at how we could specialize the compositors for various backends, we once again look for the commonalities in order to reduce the duplication. In part this is motivated by the idea that spans is a good interface for both the existent GL backend and pixman, and so they deserve a dedicated compositor. xcb/xlib target an identical rendering system and so they should be using the same compositor, and it should be possible to run that same compositor locally against pixman to generate reference tests. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> P.S. This brings massive upheaval (read breakage) I've tried delaying in order to fix as many things as possible but now this one patch does far, far, far too much. Apologies in advance for breaking your favourite backend, but trust me in that the end result will be much better. :)
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*
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* Copyright © 2011 Andrea Canciani
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Andrea Canciani <ranma42@gmail.com>
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*/
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#include "cairo-perf.h"
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#define ITER 1000
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#define HOLDOVERS 256
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#define LIVE_ENTRIES 257
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#define ACTIVE_FONTS (LIVE_ENTRIES - HOLDOVERS - 1)
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/*
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* The original implementation of hash tables was very inefficient, as
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* pointed out in https://bugs.freedesktop.org/show_bug.cgi?id=17399
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*
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* This benchmark tries to fill up the scaled_font_map hash table to
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* show the O(n) behavior.
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*/
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static cairo_time_t
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do_hash_table (cairo_t *cr, int width, int height, int loops)
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{
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/*
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* Microsoft C Compiler complains that:
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* error C2466: cannot allocate an array of constant size 0
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* so we add an unused element to make it happy
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*/
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cairo_scaled_font_t *active_fonts[ACTIVE_FONTS + 1];
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cairo_matrix_t m;
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int i;
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cairo_matrix_init_identity (&m);
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/* Touch HOLDOVERS scaled fonts to fill up the holdover list. */
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for (i = 0; i < HOLDOVERS; i++) {
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m.yy = m.xx * (i + 1);
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cairo_set_font_matrix (cr, &m);
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cairo_get_scaled_font (cr);
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}
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/*
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* Reference some scaled fonts so that they will be kept in the
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* scaled fonts map. We want LIVE_ENTRIES elements in the font
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* map, but cairo keeps HOLDOVERS recently used fonts in it and we
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* will be activating a new font in the cr context, so we just
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* keep references to ACTIVE_FONTS fonts.
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*
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* Note: setting LIVE_ENTRIES == HOLDOVERS+1 means that we keep no
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* font in active_fonts and the slowness is caused by the holdover
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* fonts only.
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*/
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for (i = 0; i < ACTIVE_FONTS; i++) {
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cairo_scaled_font_t *scaled_font;
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m.yy = m.xx * (i + 1);
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cairo_set_font_matrix (cr, &m);
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scaled_font = cairo_get_scaled_font (cr);
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active_fonts[i] = cairo_scaled_font_reference (scaled_font);
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}
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cairo_perf_timer_start ();
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while (loops--) {
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m.xx += 1.0;
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/* Generate ITER new scaled fonts per loop */
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for (i = 0; i < ITER; i++) {
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m.yy = m.xx * (i + 1);
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cairo_set_font_matrix (cr, &m);
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cairo_get_scaled_font (cr);
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}
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}
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cairo_perf_timer_stop ();
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for (i = 0; i < ACTIVE_FONTS; i++)
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cairo_scaled_font_destroy (active_fonts[i]);
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return cairo_perf_timer_elapsed ();
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}
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cairo_bool_t
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hash_table_enabled (cairo_perf_t *perf)
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{
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return cairo_perf_can_run (perf, "hash-table", NULL);
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}
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void
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hash_table (cairo_perf_t *perf, cairo_t *cr, int width, int height)
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{
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cairo_perf_cover_sources_and_operators (perf, "hash-table",
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do_hash_table, NULL);
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}
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