e4e318c9f8
glib already has a data type to manage a list of callbacks called a GHookList so we might as well use it instead of maintaining Cogl's own type. The glib version may be slightly more efficient because it avoids using a GList and instead encodes the prev and next pointers directly in the GHook structure. It also has more features than CoglCallbackList.
316 lines
9.3 KiB
C
316 lines
9.3 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2008 OpenedHand
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include "cogl-pango-glyph-cache.h"
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#include "cogl-pango-private.h"
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#include "cogl/cogl-atlas.h"
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typedef struct _CoglPangoGlyphCacheKey CoglPangoGlyphCacheKey;
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struct _CoglPangoGlyphCache
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{
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/* Hash table to quickly check whether a particular glyph in a
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particular font is already cached */
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GHashTable *hash_table;
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/* List of CoglAtlases */
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GSList *atlases;
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/* List of callbacks to invoke when an atlas is reorganized */
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GHookList reorganize_callbacks;
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/* True if some of the glyphs are dirty. This is used as an
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optimization in _cogl_pango_glyph_cache_set_dirty_glyphs to avoid
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iterating the hash table if we know none of them are dirty */
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gboolean has_dirty_glyphs;
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};
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struct _CoglPangoGlyphCacheKey
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{
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PangoFont *font;
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PangoGlyph glyph;
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};
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static void
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cogl_pango_glyph_cache_value_free (CoglPangoGlyphCacheValue *value)
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{
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cogl_handle_unref (value->texture);
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g_slice_free (CoglPangoGlyphCacheValue, value);
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}
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static void
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cogl_pango_glyph_cache_key_free (CoglPangoGlyphCacheKey *key)
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{
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g_object_unref (key->font);
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g_slice_free (CoglPangoGlyphCacheKey, key);
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}
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static guint
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cogl_pango_glyph_cache_hash_func (gconstpointer key)
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{
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const CoglPangoGlyphCacheKey *cache_key
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= (const CoglPangoGlyphCacheKey *) key;
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/* Generate a number affected by both the font and the glyph
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number. We can safely directly compare the pointers because the
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key holds a reference to the font so it is not possible that a
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different font will have the same memory address */
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return GPOINTER_TO_UINT (cache_key->font) ^ cache_key->glyph;
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}
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static gboolean
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cogl_pango_glyph_cache_equal_func (gconstpointer a,
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gconstpointer b)
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{
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const CoglPangoGlyphCacheKey *key_a
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= (const CoglPangoGlyphCacheKey *) a;
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const CoglPangoGlyphCacheKey *key_b
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= (const CoglPangoGlyphCacheKey *) b;
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/* We can safely directly compare the pointers for the fonts because
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the key holds a reference to the font so it is not possible that
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a different font will have the same memory address */
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return key_a->font == key_b->font
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&& key_a->glyph == key_b->glyph;
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}
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CoglPangoGlyphCache *
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cogl_pango_glyph_cache_new (void)
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{
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CoglPangoGlyphCache *cache;
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cache = g_malloc (sizeof (CoglPangoGlyphCache));
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cache->hash_table = g_hash_table_new_full
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(cogl_pango_glyph_cache_hash_func,
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cogl_pango_glyph_cache_equal_func,
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(GDestroyNotify) cogl_pango_glyph_cache_key_free,
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(GDestroyNotify) cogl_pango_glyph_cache_value_free);
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cache->atlases = NULL;
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g_hook_list_init (&cache->reorganize_callbacks, sizeof (GHook));
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cache->has_dirty_glyphs = FALSE;
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return cache;
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}
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void
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cogl_pango_glyph_cache_clear (CoglPangoGlyphCache *cache)
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{
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g_slist_foreach (cache->atlases, (GFunc) cogl_object_unref, NULL);
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g_slist_free (cache->atlases);
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cache->atlases = NULL;
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cache->has_dirty_glyphs = FALSE;
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g_hash_table_remove_all (cache->hash_table);
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}
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void
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cogl_pango_glyph_cache_free (CoglPangoGlyphCache *cache)
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{
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cogl_pango_glyph_cache_clear (cache);
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g_hash_table_unref (cache->hash_table);
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g_hook_list_clear (&cache->reorganize_callbacks);
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g_free (cache);
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}
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static void
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cogl_pango_glyph_cache_update_position_cb (void *user_data,
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CoglHandle new_texture,
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const CoglRectangleMapEntry *rect)
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{
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CoglPangoGlyphCacheValue *value = user_data;
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float tex_width, tex_height;
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if (value->texture)
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cogl_handle_unref (value->texture);
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value->texture = cogl_handle_ref (new_texture);
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tex_width = cogl_texture_get_width (new_texture);
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tex_height = cogl_texture_get_height (new_texture);
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value->tx1 = rect->x / tex_width;
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value->ty1 = rect->y / tex_height;
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value->tx2 = (rect->x + value->draw_width) / tex_width;
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value->ty2 = (rect->y + value->draw_height) / tex_height;
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value->tx_pixel = rect->x;
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value->ty_pixel = rect->y;
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/* The glyph has changed position so it will need to be redrawn */
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value->dirty = TRUE;
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}
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static void
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cogl_pango_glyph_cache_reorganize_cb (void *user_data)
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{
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CoglPangoGlyphCache *cache = user_data;
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g_hook_list_invoke (&cache->reorganize_callbacks, FALSE);
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}
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CoglPangoGlyphCacheValue *
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cogl_pango_glyph_cache_lookup (CoglPangoGlyphCache *cache,
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gboolean create,
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PangoFont *font,
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PangoGlyph glyph)
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{
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CoglPangoGlyphCacheKey lookup_key;
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CoglPangoGlyphCacheValue *value;
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lookup_key.font = font;
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lookup_key.glyph = glyph;
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value = g_hash_table_lookup (cache->hash_table, &lookup_key);
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if (create && value == NULL)
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{
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CoglPangoGlyphCacheKey *key;
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PangoRectangle ink_rect;
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CoglAtlas *atlas = NULL;
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GSList *l;
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pango_font_get_glyph_extents (font, glyph, &ink_rect, NULL);
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pango_extents_to_pixels (&ink_rect, NULL);
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value = g_slice_new (CoglPangoGlyphCacheValue);
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value->texture = COGL_INVALID_HANDLE;
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value->draw_x = ink_rect.x;
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value->draw_y = ink_rect.y;
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value->draw_width = ink_rect.width;
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value->draw_height = ink_rect.height;
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value->dirty = TRUE;
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/* Look for an atlas that can reserve the space */
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for (l = cache->atlases; l; l = l->next)
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if (_cogl_atlas_reserve_space (l->data,
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ink_rect.width + 1, ink_rect.height + 1,
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value))
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{
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atlas = l->data;
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break;
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}
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/* If we couldn't find one then start a new atlas */
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if (atlas == NULL)
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{
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atlas = _cogl_atlas_new (COGL_PIXEL_FORMAT_A_8,
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TRUE,
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cogl_pango_glyph_cache_update_position_cb);
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COGL_NOTE (ATLAS, "Created new atlas for glyphs: %p", atlas);
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/* If we still can't reserve space then something has gone
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seriously wrong so we'll just give up */
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if (!_cogl_atlas_reserve_space (atlas,
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ink_rect.width + 1,
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ink_rect.height + 1, value))
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{
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cogl_object_unref (atlas);
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cogl_pango_glyph_cache_value_free (value);
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return NULL;
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}
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_cogl_atlas_add_reorganize_callback
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(atlas, cogl_pango_glyph_cache_reorganize_cb, NULL, cache);
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cache->atlases = g_slist_prepend (cache->atlases, atlas);
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}
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key = g_slice_new (CoglPangoGlyphCacheKey);
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key->font = g_object_ref (font);
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key->glyph = glyph;
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g_hash_table_insert (cache->hash_table, key, value);
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cache->has_dirty_glyphs = TRUE;
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}
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return value;
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}
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static void
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_cogl_pango_glyph_cache_set_dirty_glyphs_cb (gpointer key_ptr,
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gpointer value_ptr,
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gpointer user_data)
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{
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CoglPangoGlyphCacheKey *key = key_ptr;
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CoglPangoGlyphCacheValue *value = value_ptr;
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CoglPangoGlyphCacheDirtyFunc func = user_data;
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if (value->dirty)
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{
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func (key->font, key->glyph, value);
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value->dirty = FALSE;
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}
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}
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void
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_cogl_pango_glyph_cache_set_dirty_glyphs (CoglPangoGlyphCache *cache,
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CoglPangoGlyphCacheDirtyFunc func)
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{
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/* If we know that there are no dirty glyphs then we can shortcut
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out early */
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if (!cache->has_dirty_glyphs)
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return;
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g_hash_table_foreach (cache->hash_table,
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_cogl_pango_glyph_cache_set_dirty_glyphs_cb,
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func);
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cache->has_dirty_glyphs = FALSE;
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}
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void
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_cogl_pango_glyph_cache_add_reorganize_callback (CoglPangoGlyphCache *cache,
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GHookFunc func,
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void *user_data)
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{
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GHook *hook = g_hook_alloc (&cache->reorganize_callbacks);
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hook->func = func;
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hook->data = user_data;
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g_hook_prepend (&cache->reorganize_callbacks, hook);
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}
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void
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_cogl_pango_glyph_cache_remove_reorganize_callback (CoglPangoGlyphCache *cache,
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GHookFunc func,
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void *user_data)
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{
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GHook *hook = g_hook_find_func_data (&cache->reorganize_callbacks,
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FALSE,
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func,
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user_data);
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if (hook)
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g_hook_destroy_link (&cache->reorganize_callbacks, hook);
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}
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