[gtk/css-lookup-caching: 80/96] lookup: Don't store flat arrays

[Matthias Clasen <matthiasc src gnome org>]

commit 43076f3fe48a2dd784e0507ac071a1b62bc7d04b
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 10 18:22:17 2020 -0500

    lookup: Don't store flat arrays
    
    Most lookups have no or just a few values.
    We can drastically reduce the amount of memory used for lookups,
    and then we can afford to keep them around and avoid some lookups
    in the future.

 gtk/gtkcsslookup.c        | 28 +++++++++++++++++++++++++---
 gtk/gtkcsslookupprivate.h | 17 +++++++++++++++--
 2 files changed, 40 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkcsslookup.c b/gtk/gtkcsslookup.c
index 11f15e837f..d621604957 100644
--- a/gtk/gtkcsslookup.c
+++ b/gtk/gtkcsslookup.c
@@ -24,6 +24,16 @@
 #include "gtkprivatetypebuiltins.h"
 #include "gtkprivate.h"
 
+static void
+free_value (gpointer data)
+{
+  GtkCssLookupValue *value = data;
+
+  gtk_css_value_unref (value->value);
+  if (value->section)
+    gtk_css_section_unref (value->section);
+}
+
 GtkCssLookup *
 gtk_css_lookup_new (void)
 {
@@ -39,6 +49,8 @@ static void
 gtk_css_lookup_free (GtkCssLookup *lookup)
 {
   _gtk_bitmask_free (lookup->set_values);
+  if (lookup->values)
+    g_array_unref (lookup->values);
   g_free (lookup);
 }
 
@@ -93,11 +105,21 @@ gtk_css_lookup_set (GtkCssLookup  *lookup,
                     GtkCssSection *section,
                     GtkCssValue   *value)
 {
+  GtkCssLookupValue v;
+
   gtk_internal_return_if_fail (lookup != NULL);
   gtk_internal_return_if_fail (value != NULL);
-  gtk_internal_return_if_fail (lookup->values[id].value == NULL);
 
-  lookup->values[id].value = value;
-  lookup->values[id].section = section;
+  v.value = gtk_css_value_ref (value);
+  v.section = section ? gtk_css_section_ref (section) : NULL;
+  v.id = id;
+
+  if (!lookup->values)
+    {
+      lookup->values = g_array_sized_new (FALSE, FALSE, sizeof (GtkCssLookupValue), 16);
+      g_array_set_clear_func (lookup->values, free_value);
+    }
+
+  g_array_append_val (lookup->values, v);
   lookup->set_values = _gtk_bitmask_set (lookup->set_values, id, TRUE);
 }
diff --git a/gtk/gtkcsslookupprivate.h b/gtk/gtkcsslookupprivate.h
index 49c2c0b1e9..7fcd530d7e 100644
--- a/gtk/gtkcsslookupprivate.h
+++ b/gtk/gtkcsslookupprivate.h
@@ -33,12 +33,13 @@ typedef struct _GtkCssLookup GtkCssLookup;
 typedef struct {
   GtkCssSection     *section;
   GtkCssValue       *value;
+  guint              id;
 } GtkCssLookupValue;
 
 struct _GtkCssLookup {
   int ref_count;
   GtkBitmask *set_values;
-  GtkCssLookupValue  values[GTK_CSS_PROPERTY_N_PROPERTIES];
+  GArray *values;
 };
 
 GtkCssLookup *           gtk_css_lookup_new (void);
@@ -62,7 +63,19 @@ static inline GtkCssLookupValue *
 gtk_css_lookup_get (GtkCssLookup *lookup,
                     guint         id)
 {
-  return &lookup->values[id];
+  if (_gtk_bitmask_get (lookup->set_values, id))
+    {
+      int i;
+
+      for (i = 0; i < lookup->values->len; i++)
+        {
+          GtkCssLookupValue *value = &g_array_index (lookup->values, GtkCssLookupValue, i);
+          if (value->id == id)
+            return value;
+        }
+    }
+
+  return NULL;
 } 
 
 G_END_DECLS