forked from AuroraMiddleware/gtk
170130f1d9
Add a fast path for parent selector matching that uses a bloom filter to quickly discard selectors that can't possibly match. Keep in mind that we match using a bloom filter, so we might accidentally include too many selectors when hash/bucket collisions occur. That's not a correctness problem though, because we'll do a real check afterwards. The idea for this change is taken from browsers, in particular WebKit.
368 lines
10 KiB
C
368 lines
10 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2012 Benjamin Otte <otte@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkstylecascadeprivate.h"
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#include "gtkstyleprovider.h"
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#include "gtkstyleproviderprivate.h"
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#include "gtkprivate.h"
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typedef struct _GtkStyleCascadeIter GtkStyleCascadeIter;
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typedef struct _GtkStyleProviderData GtkStyleProviderData;
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struct _GtkStyleCascadeIter {
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int n_cascades;
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int *cascade_index; /* each one points at last index that was returned, */
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/* not next one that should be returned */
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};
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struct _GtkStyleProviderData
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{
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GtkStyleProvider *provider;
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guint priority;
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guint changed_signal_id;
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};
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static GtkStyleProvider *
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gtk_style_cascade_iter_next (GtkStyleCascade *cascade,
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GtkStyleCascadeIter *iter)
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{
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GtkStyleCascade *cas;
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int ix, highest_priority_index = 0;
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GtkStyleProviderData *highest_priority_data = NULL;
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for (cas = cascade, ix = 0; ix < iter->n_cascades; cas = cas->parent, ix++)
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{
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GtkStyleProviderData *data;
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if (iter->cascade_index[ix] <= 0)
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continue;
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data = &g_array_index (cas->providers,
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GtkStyleProviderData,
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iter->cascade_index[ix] - 1);
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if (highest_priority_data == NULL || data->priority > highest_priority_data->priority)
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{
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highest_priority_index = ix;
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highest_priority_data = data;
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}
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}
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if (highest_priority_data != NULL)
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{
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iter->cascade_index[highest_priority_index]--;
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return highest_priority_data->provider;
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}
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return NULL;
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}
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static GtkStyleProvider *
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gtk_style_cascade_iter_init (GtkStyleCascade *cascade,
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GtkStyleCascadeIter *iter)
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{
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GtkStyleCascade *cas = cascade;
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int ix;
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iter->n_cascades = 1;
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while ((cas = cas->parent) != NULL)
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iter->n_cascades++;
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iter->cascade_index = g_new (int, iter->n_cascades);
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for (cas = cascade, ix = 0; ix < iter->n_cascades; cas = cas->parent, ix++)
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iter->cascade_index[ix] = cas->providers->len;
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return gtk_style_cascade_iter_next (cascade, iter);
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}
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static void
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gtk_style_cascade_iter_clear (GtkStyleCascadeIter *iter)
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{
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g_free (iter->cascade_index);
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}
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static GtkSettings *
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gtk_style_cascade_get_settings (GtkStyleProvider *provider)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
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GtkStyleCascadeIter iter;
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GtkSettings *settings;
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GtkStyleProvider *item;
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for (item = gtk_style_cascade_iter_init (cascade, &iter);
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item;
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item = gtk_style_cascade_iter_next (cascade, &iter))
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{
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settings = gtk_style_provider_get_settings (item);
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if (settings)
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{
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gtk_style_cascade_iter_clear (&iter);
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return settings;
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}
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}
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gtk_style_cascade_iter_clear (&iter);
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return NULL;
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}
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static GtkCssValue *
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gtk_style_cascade_get_color (GtkStyleProvider *provider,
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const char *name)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
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GtkStyleCascadeIter iter;
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GtkCssValue *color;
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GtkStyleProvider *item;
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for (item = gtk_style_cascade_iter_init (cascade, &iter);
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item;
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item = gtk_style_cascade_iter_next (cascade, &iter))
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{
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color = gtk_style_provider_get_color (item, name);
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if (color)
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{
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gtk_style_cascade_iter_clear (&iter);
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return color;
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}
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}
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gtk_style_cascade_iter_clear (&iter);
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return NULL;
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}
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static int
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gtk_style_cascade_get_scale (GtkStyleProvider *provider)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
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return cascade->scale;
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}
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static GtkCssKeyframes *
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gtk_style_cascade_get_keyframes (GtkStyleProvider *provider,
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const char *name)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
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GtkStyleCascadeIter iter;
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GtkCssKeyframes *keyframes;
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GtkStyleProvider *item;
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for (item = gtk_style_cascade_iter_init (cascade, &iter);
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item;
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item = gtk_style_cascade_iter_next (cascade, &iter))
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{
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keyframes = gtk_style_provider_get_keyframes (item, name);
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if (keyframes)
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{
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gtk_style_cascade_iter_clear (&iter);
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return keyframes;
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}
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}
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gtk_style_cascade_iter_clear (&iter);
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return NULL;
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}
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static void
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gtk_style_cascade_lookup (GtkStyleProvider *provider,
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const GtkCountingBloomFilter *filter,
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GtkCssNode *node,
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GtkCssLookup *lookup,
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GtkCssChange *change)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (provider);
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GtkStyleCascadeIter iter;
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GtkStyleProvider *item;
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GtkCssChange iter_change;
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for (item = gtk_style_cascade_iter_init (cascade, &iter);
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item;
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item = gtk_style_cascade_iter_next (cascade, &iter))
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{
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gtk_style_provider_lookup (item, filter, node, lookup,
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change ? &iter_change : NULL);
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if (change)
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*change |= iter_change;
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}
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gtk_style_cascade_iter_clear (&iter);
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}
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static void
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gtk_style_cascade_provider_iface_init (GtkStyleProviderInterface *iface)
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{
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iface->get_color = gtk_style_cascade_get_color;
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iface->get_settings = gtk_style_cascade_get_settings;
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iface->get_scale = gtk_style_cascade_get_scale;
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iface->get_keyframes = gtk_style_cascade_get_keyframes;
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iface->lookup = gtk_style_cascade_lookup;
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}
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G_DEFINE_TYPE_EXTENDED (GtkStyleCascade, _gtk_style_cascade, G_TYPE_OBJECT, 0,
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G_IMPLEMENT_INTERFACE (GTK_TYPE_STYLE_PROVIDER,
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gtk_style_cascade_provider_iface_init));
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static void
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gtk_style_cascade_dispose (GObject *object)
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{
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GtkStyleCascade *cascade = GTK_STYLE_CASCADE (object);
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_gtk_style_cascade_set_parent (cascade, NULL);
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g_array_unref (cascade->providers);
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G_OBJECT_CLASS (_gtk_style_cascade_parent_class)->dispose (object);
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}
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static void
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_gtk_style_cascade_class_init (GtkStyleCascadeClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = gtk_style_cascade_dispose;
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}
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static void
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style_provider_data_clear (gpointer data_)
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{
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GtkStyleProviderData *data = data_;
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g_signal_handler_disconnect (data->provider, data->changed_signal_id);
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g_object_unref (data->provider);
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}
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static void
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_gtk_style_cascade_init (GtkStyleCascade *cascade)
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{
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cascade->scale = 1;
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cascade->providers = g_array_new (FALSE, FALSE, sizeof (GtkStyleProviderData));
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g_array_set_clear_func (cascade->providers, style_provider_data_clear);
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}
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GtkStyleCascade *
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_gtk_style_cascade_new (void)
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{
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return g_object_new (GTK_TYPE_STYLE_CASCADE, NULL);
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}
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void
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_gtk_style_cascade_set_parent (GtkStyleCascade *cascade,
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GtkStyleCascade *parent)
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{
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gtk_internal_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
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gtk_internal_return_if_fail (parent == NULL || GTK_IS_STYLE_CASCADE (parent));
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if (cascade->parent == parent)
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return;
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if (parent)
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{
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g_object_ref (parent);
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g_signal_connect_swapped (parent,
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"gtk-private-changed",
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G_CALLBACK (gtk_style_provider_changed),
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cascade);
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}
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if (cascade->parent)
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{
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g_signal_handlers_disconnect_by_func (cascade->parent,
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gtk_style_provider_changed,
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cascade);
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g_object_unref (cascade->parent);
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}
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cascade->parent = parent;
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}
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void
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_gtk_style_cascade_add_provider (GtkStyleCascade *cascade,
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GtkStyleProvider *provider,
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guint priority)
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{
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GtkStyleProviderData data;
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guint i;
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gtk_internal_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
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gtk_internal_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
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gtk_internal_return_if_fail (GTK_STYLE_PROVIDER (cascade) != provider);
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data.provider = g_object_ref (provider);
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data.priority = priority;
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data.changed_signal_id = g_signal_connect_swapped (provider,
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"gtk-private-changed",
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G_CALLBACK (gtk_style_provider_changed),
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cascade);
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/* ensure it gets removed first */
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_gtk_style_cascade_remove_provider (cascade, provider);
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for (i = 0; i < cascade->providers->len; i++)
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{
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if (g_array_index (cascade->providers, GtkStyleProviderData, i).priority > priority)
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break;
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}
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g_array_insert_val (cascade->providers, i, data);
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gtk_style_provider_changed (GTK_STYLE_PROVIDER (cascade));
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}
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void
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_gtk_style_cascade_remove_provider (GtkStyleCascade *cascade,
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GtkStyleProvider *provider)
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{
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guint i;
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gtk_internal_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
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gtk_internal_return_if_fail (GTK_IS_STYLE_PROVIDER (provider));
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for (i = 0; i < cascade->providers->len; i++)
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{
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GtkStyleProviderData *data = &g_array_index (cascade->providers, GtkStyleProviderData, i);
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if (data->provider == provider)
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{
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g_array_remove_index (cascade->providers, i);
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gtk_style_provider_changed (GTK_STYLE_PROVIDER (cascade));
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break;
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}
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}
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}
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void
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_gtk_style_cascade_set_scale (GtkStyleCascade *cascade,
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int scale)
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{
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gtk_internal_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
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if (cascade->scale == scale)
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return;
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cascade->scale = scale;
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gtk_style_provider_changed (GTK_STYLE_PROVIDER (cascade));
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}
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int
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_gtk_style_cascade_get_scale (GtkStyleCascade *cascade)
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{
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gtk_internal_return_val_if_fail (GTK_IS_STYLE_CASCADE (cascade), 1);
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return cascade->scale;
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}
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