8123330061
The glyph cache is now stored in a CoglAtlas structure instead of the custom atlasing code. This has the advantage that it can share code with the main texture atlas and that it supports reorganizing the atlas when it becomes full. Unlike the texture atlas, the glyph cache can use multiple atlases which would be neccessary if the maximum texture size is reached and we need to create a second texture. Whenever a display list is created it now has to register a callback with the glyph cache so that the display list can be recreated whenever any of the atlases are reorganized. This is needed because the display list directly stores texture coordinates within the atlas texture and they would become invalid when the texture is moved. The ensure_glyphs_for_layout now works in two steps. First it reserves space in the atlas for all of the glyphs. The atlas is created with the DISABLE_MIGRATION flag so that it won't actually copy any textures if any rearranging is needed. Whenever the position is updated for a glyph then it is marked as dirty. After space for all of the glyphs has been reserved it will iterate over all dirty glyphs and redraw them using Cairo. The rendered glyph is then stored in the texture with a sub texture update. The glyphs need to all be set at the right location before starting to create the display list because the display list stores the texture coordinates of the glyph. If any of the glyphs were moved around then the parts of the display list that was created already would become invalid. To make this work, ensure_glyphs_for_layout is now always called before rendering a layout or a layout line.
95 lines
2.8 KiB
C
95 lines
2.8 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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#ifndef __COGL_PANGO_GLYPH_CACHE_H__
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#define __COGL_PANGO_GLYPH_CACHE_H__
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#include <glib.h>
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#include <cogl/cogl.h>
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#include <cogl/cogl-callback-list.h>
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#include <pango/pango-font.h>
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G_BEGIN_DECLS
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typedef struct _CoglPangoGlyphCache CoglPangoGlyphCache;
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typedef struct _CoglPangoGlyphCacheValue CoglPangoGlyphCacheValue;
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struct _CoglPangoGlyphCacheValue
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{
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CoglHandle texture;
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float tx1;
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float ty1;
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float tx2;
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float ty2;
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int tx_pixel;
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int ty_pixel;
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int draw_x;
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int draw_y;
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int draw_width;
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int draw_height;
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/* This will be set to TRUE when the glyph atlas is reorganized
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which means the glyph will need to be redrawn */
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gboolean dirty;
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};
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typedef void (* CoglPangoGlyphCacheDirtyFunc) (PangoFont *font,
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PangoGlyph glyph,
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CoglPangoGlyphCacheValue *value);
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CoglPangoGlyphCache *
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cogl_pango_glyph_cache_new (void);
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void
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cogl_pango_glyph_cache_free (CoglPangoGlyphCache *cache);
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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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void
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cogl_pango_glyph_cache_clear (CoglPangoGlyphCache *cache);
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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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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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void
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_cogl_pango_glyph_cache_set_dirty_glyphs (CoglPangoGlyphCache *cache,
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CoglPangoGlyphCacheDirtyFunc func);
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G_END_DECLS
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#endif /* __COGL_PANGO_GLYPH_CACHE_H__ */
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