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cogl-pango-glyph-cache: Don't put zero-sized glyphs in the cache

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It now avoids trying to reserve space for zero-sized glyphs. That
happens for example when the layout contains a space. This was causing
the regular glyph cache to be used because the global atlas does not
support zero-sized images. That would then break up the
batching. Instead it now still reserves an entry in the cache but
leaves the texture as COGL_INVALID_HANDLE.
This commit is contained in:
Neil Roberts 2010-02-22 16:40:49 +00:00 committed by Robert Bragg
parent f098f8fdec
commit b83069f3b2
2 changed files with 30 additions and 16 deletions
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15
pango/cogl-pango-glyph-cache.c
View File

@ -70,6 +70,7 @@ struct _CoglPangoGlyphCacheKey
static void
cogl_pango_glyph_cache_value_free (CoglPangoGlyphCacheValue *value)
{
if (value->texture)
cogl_handle_unref (value->texture);
g_slice_free (CoglPangoGlyphCacheValue, value);
}
@ -307,7 +308,6 @@ cogl_pango_glyph_cache_lookup (CoglPangoGlyphCache *cache,
value = g_slice_new (CoglPangoGlyphCacheValue);
value->texture = COGL_INVALID_HANDLE;
value->dirty = TRUE;
pango_font_get_glyph_extents (font, glyph, &ink_rect, NULL);
pango_extents_to_pixels (&ink_rect, NULL);
@ -317,11 +317,18 @@ cogl_pango_glyph_cache_lookup (CoglPangoGlyphCache *cache,
value->draw_width = ink_rect.width;
value->draw_height = ink_rect.height;
/* If the glyph is zero-sized then we don't need to reserve any
space for it and we can just avoid painting anything */
if (ink_rect.width < 1 || ink_rect.height < 1)
value->dirty = FALSE;
else
{
/* Try adding the glyph to the global atlas... */
if (!cogl_pango_glyph_cache_add_to_global_atlas (cache,
font,
glyph,
value) &&
/* If it fails try the local atlas */
!cogl_pango_glyph_cache_add_to_local_atlas (cache,
font,
glyph,
@ -331,13 +338,15 @@ cogl_pango_glyph_cache_lookup (CoglPangoGlyphCache *cache,
return NULL;
}
value->dirty = TRUE;
cache->has_dirty_glyphs = TRUE;
}
key = g_slice_new (CoglPangoGlyphCacheKey);
key->font = g_object_ref (font);
key->glyph = glyph;
g_hash_table_insert (cache->hash_table, key, value);
cache->has_dirty_glyphs = TRUE;
}
return value;

7
pango/cogl-pango-render.c
View File

@ -501,6 +501,11 @@ cogl_pango_renderer_set_dirty_glyph (PangoFont *font,
COGL_NOTE (PANGO, "redrawing glyph %i", glyph);
/* Glyphs that don't take up any space will end up without a
texture. These should never become dirty so they shouldn't end up
here */
g_return_if_fail (value->texture != COGL_INVALID_HANDLE);
surface = cairo_image_surface_create (CAIRO_FORMAT_A8,
value->draw_width,
value->draw_height);
@ -824,7 +829,7 @@ cogl_pango_renderer_draw_glyphs (PangoRenderer *renderer,
PANGO_UNKNOWN_GLYPH_WIDTH,
PANGO_UNKNOWN_GLYPH_HEIGHT);
}
else
else if (cache_value->texture)
{
x += (float)(cache_value->draw_x);
y += (float)(cache_value->draw_y);