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Previously Cogl would only ever use one atlas for textures and if it reached the maximum texture size then all other new textures would get their own GL texture. This patch makes it so that we create as many atlases as needed. This should avoid breaking up some batches and it will be particularly good if we switch to always using multi-texturing with a default shader that selects between multiple atlases using a vertex attribute. Whenever a new atlas is created it is stored in a GSList on the context. A weak weference is taken on the atlas using cogl_object_set_user_data so that it can be removed from the list when the atlas is destroyed. The atlas textures themselves take a reference to the atlas and this is the only thing that keeps the atlas alive. This means that once the atlas becomes empty it will automatically be destroyed. All of the COGL_NOTEs pertaining to atlases are now prefixed with the atlas pointer to make it clearer which atlas is changing.
309 lines
9.1 KiB
C
309 lines
9.1 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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#include "cogl/cogl-callback-list.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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CoglCallbackList 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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_cogl_callback_list_init (&cache->reorganize_callbacks);
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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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_cogl_callback_list_destroy (&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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_cogl_callback_list_invoke (&cache->reorganize_callbacks);
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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, 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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CoglCallbackListFunc func,
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void *user_data)
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{
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_cogl_callback_list_add (&cache->reorganize_callbacks, func, user_data);
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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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CoglCallbackListFunc func,
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void *user_data)
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{
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_cogl_callback_list_remove (&cache->reorganize_callbacks, func, user_data);
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}
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