mutter/cogl-pango/cogl-pango-pipeline-cache.c
Robert Bragg 6f2193545e consistently refer to cogl-pango as "cogl-pango"
This renames the pango directory to cogl-pango and it renames the
installed library to libcogl-pango instead of libcoglpango.
2011-05-06 12:12:08 +01:00

239 lines
6.7 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <cogl/cogl.h>
#include "cogl-pango-pipeline-cache.h"
typedef struct _CoglPangoPipelineCacheEntry CoglPangoPipelineCacheEntry;
struct _CoglPangoPipelineCache
{
GHashTable *hash_table;
CoglPipeline *base_texture_alpha_pipeline;
CoglPipeline *base_texture_rgba_pipeline;
gboolean use_mipmapping;
};
struct _CoglPangoPipelineCacheEntry
{
/* This will take a reference or it can be NULL to represent the
pipeline used to render colors */
CoglHandle texture;
/* This will only take a weak reference */
CoglHandle pipeline;
};
static void
_cogl_pango_pipeline_cache_key_destroy (gpointer data)
{
if (data)
cogl_object_unref (data);
}
static void
_cogl_pango_pipeline_cache_value_destroy (gpointer data)
{
CoglPangoPipelineCacheEntry *cache_entry = data;
if (cache_entry->texture)
cogl_object_unref (cache_entry->texture);
/* We don't need to unref the pipeline because it only takes a weak
reference */
g_slice_free (CoglPangoPipelineCacheEntry, cache_entry);
}
CoglPangoPipelineCache *
_cogl_pango_pipeline_cache_new (gboolean use_mipmapping)
{
CoglPangoPipelineCache *cache = g_new (CoglPangoPipelineCache, 1);
/* The key is the pipeline pointer. A reference is taken when the
pipeline is used as a key so we should unref it again in the
destroy function */
cache->hash_table =
g_hash_table_new_full (g_direct_hash,
g_direct_equal,
_cogl_pango_pipeline_cache_key_destroy,
_cogl_pango_pipeline_cache_value_destroy);
cache->base_texture_rgba_pipeline = NULL;
cache->base_texture_alpha_pipeline = NULL;
cache->use_mipmapping = use_mipmapping;
return cache;
}
static CoglPipeline *
get_base_texture_rgba_pipeline (CoglPangoPipelineCache *cache)
{
if (cache->base_texture_rgba_pipeline == NULL)
{
CoglPipeline *pipeline;
pipeline = cache->base_texture_rgba_pipeline = cogl_pipeline_new ();
cogl_pipeline_set_layer_wrap_mode (pipeline, 0,
COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE);
if (cache->use_mipmapping)
cogl_pipeline_set_layer_filters
(pipeline, 0,
COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR,
COGL_PIPELINE_FILTER_LINEAR);
}
return cache->base_texture_rgba_pipeline;
}
static CoglPipeline *
get_base_texture_alpha_pipeline (CoglPangoPipelineCache *cache)
{
if (cache->base_texture_alpha_pipeline == NULL)
{
CoglPipeline *pipeline;
pipeline = cogl_pipeline_copy (get_base_texture_rgba_pipeline (cache));
cache->base_texture_alpha_pipeline = pipeline;
/* The default combine mode of materials is to modulate (A x B)
* the texture RGBA channels with the RGBA channels of the
* previous layer (which in our case is just the font color)
*
* Since the RGB for an alpha texture is defined as 0, this gives us:
*
* result.rgb = color.rgb * 0
* result.a = color.a * texture.a
*
* What we want is premultiplied rgba values:
*
* result.rgba = color.rgb * texture.a
* result.a = color.a * texture.a
*/
cogl_pipeline_set_layer_combine (pipeline, 0, /* layer */
"RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
NULL);
}
return cache->base_texture_alpha_pipeline;
}
typedef struct
{
CoglPangoPipelineCache *cache;
CoglHandle texture;
} PipelineDestroyNotifyData;
static void
pipeline_destroy_notify_cb (void *user_data)
{
PipelineDestroyNotifyData *data = user_data;
g_hash_table_remove (data->cache->hash_table, data->texture);
g_slice_free (PipelineDestroyNotifyData, data);
}
CoglPipeline *
_cogl_pango_pipeline_cache_get (CoglPangoPipelineCache *cache,
CoglHandle texture)
{
CoglPangoPipelineCacheEntry *entry;
PipelineDestroyNotifyData *destroy_data;
static CoglUserDataKey pipeline_destroy_notify_key;
/* Look for an existing entry */
entry = g_hash_table_lookup (cache->hash_table, texture);
if (entry)
return cogl_object_ref (entry->pipeline);
/* No existing pipeline was found so let's create another */
entry = g_slice_new (CoglPangoPipelineCacheEntry);
if (texture)
{
CoglPipeline *base;
entry->texture = cogl_handle_ref (texture);
if (cogl_texture_get_format (entry->texture) == COGL_PIXEL_FORMAT_A_8)
base = get_base_texture_alpha_pipeline (cache);
else
base = get_base_texture_rgba_pipeline (cache);
entry->pipeline = cogl_pipeline_copy (base);
cogl_pipeline_set_layer_texture (entry->pipeline, 0 /* layer */, texture);
}
else
{
entry->texture = NULL;
entry->pipeline = cogl_pipeline_new ();
}
/* Add a weak reference to the pipeline so we can remove it from the
hash table when it is destroyed */
destroy_data = g_slice_new (PipelineDestroyNotifyData);
destroy_data->cache = cache;
destroy_data->texture = texture;
cogl_object_set_user_data (entry->pipeline,
&pipeline_destroy_notify_key,
destroy_data,
pipeline_destroy_notify_cb);
g_hash_table_insert (cache->hash_table,
texture ? cogl_handle_ref (texture) : NULL,
entry);
/* This doesn't take a reference on the pipeline so that it will use
the newly created reference */
return entry->pipeline;
}
void
_cogl_pango_pipeline_cache_free (CoglPangoPipelineCache *cache)
{
if (cache->base_texture_rgba_pipeline)
cogl_object_unref (cache->base_texture_rgba_pipeline);
if (cache->base_texture_alpha_pipeline)
cogl_object_unref (cache->base_texture_alpha_pipeline);
g_hash_table_destroy (cache->hash_table);
g_free (cache);
}