mutter/cogl/cogl-pango/cogl-pango-pipeline-cache.c
2016-04-22 16:44:31 +02:00

243 lines
7.1 KiB
C

/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2011 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include "cogl-pango-pipeline-cache.h"
#include "cogl/cogl-context-private.h"
#include "cogl/cogl-texture-private.h"
typedef struct _CoglPangoPipelineCacheEntry CoglPangoPipelineCacheEntry;
struct _CoglPangoPipelineCacheEntry
{
/* This will take a reference or it can be NULL to represent the
pipeline used to render colors */
CoglTexture *texture;
/* This will only take a weak reference */
CoglPipeline *pipeline;
};
static void
_cogl_pango_pipeline_cache_key_destroy (void *data)
{
if (data)
cogl_object_unref (data);
}
static void
_cogl_pango_pipeline_cache_value_destroy (void *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 (CoglContext *ctx,
CoglBool use_mipmapping)
{
CoglPangoPipelineCache *cache = g_new (CoglPangoPipelineCache, 1);
cache->ctx = cogl_object_ref (ctx);
/* 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 (cache->ctx);
cogl_pipeline_set_layer_wrap_mode (pipeline, 0,
COGL_PIPELINE_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;
CoglTexture *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,
CoglTexture *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_object_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 (cache->ctx);
}
/* 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 (COGL_OBJECT (entry->pipeline),
&pipeline_destroy_notify_key,
destroy_data,
pipeline_destroy_notify_cb);
g_hash_table_insert (cache->hash_table,
texture ? cogl_object_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);
cogl_object_unref (cache->ctx);
g_free (cache);
}