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gnome-shell/src/st/st-texture-cache.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-texture-cache.h: Object for loading and caching images as textures
*
* Copyright 2009, 2010 Red Hat, Inc.
* Copyright 2010, Maxim Ermilov
*
* This program 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 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "st-texture-cache.h"
#include <gtk/gtk.h>
#include <string.h>
#include <glib.h>
#define CACHE_PREFIX_ICON "icon:"
#define CACHE_PREFIX_URI "uri:"
#define CACHE_PREFIX_URI_FOR_CAIRO "uri-for-cairo:"
#define CACHE_PREFIX_RAW_CHECKSUM "raw-checksum:"
#define CACHE_PREFIX_COMPRESSED_CHECKSUM "compressed-checksum:"
struct _StTextureCachePrivate
{
GtkIconTheme *icon_theme;
/* Things that were loaded with a cache policy != NONE */
GHashTable *keyed_cache; /* char * -> CoglTexture* */
/* Presently this is used to de-duplicate requests for GIcons,
* it could in theory be extended to async URL loading and other
* cases too.
*/
GHashTable *outstanding_requests; /* char * -> AsyncTextureLoadData * */
};
static void st_texture_cache_dispose (GObject *object);
static void st_texture_cache_finalize (GObject *object);
enum
{
ICON_THEME_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0, };
G_DEFINE_TYPE(StTextureCache, st_texture_cache, G_TYPE_OBJECT);
/* We want to preserve the aspect ratio by default, also the default
* material for an empty texture is full opacity white, which we
* definitely don't want. Skip that by setting 0 opacity.
*/
static ClutterTexture *
create_default_texture (void)
{
ClutterTexture * texture = CLUTTER_TEXTURE (clutter_texture_new ());
g_object_set (texture, "keep-aspect-ratio", TRUE, "opacity", 0, NULL);
return texture;
}
/* Reverse the opacity we added while loading */
static void
set_texture_cogl_texture (ClutterTexture *clutter_texture, CoglHandle cogl_texture)
{
clutter_texture_set_cogl_texture (clutter_texture, cogl_texture);
g_object_set (clutter_texture, "opacity", 255, NULL);
}
static void
st_texture_cache_class_init (StTextureCacheClass *klass)
{
GObjectClass *gobject_class = (GObjectClass *)klass;
gobject_class->dispose = st_texture_cache_dispose;
gobject_class->finalize = st_texture_cache_finalize;
signals[ICON_THEME_CHANGED] =
g_signal_new ("icon-theme-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0, /* no default handler slot */
NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
/* Evicts all cached textures for named icons */
static void
st_texture_cache_evict_icons (StTextureCache *cache)
{
GHashTableIter iter;
gpointer key;
gpointer value;
g_hash_table_iter_init (&iter, cache->priv->keyed_cache);
while (g_hash_table_iter_next (&iter, &key, &value))
{
const char *cache_key = key;
/* This is too conservative - it takes out all cached textures
* for GIcons even when they aren't named icons, but it's not
* worth the complexity of parsing the key and calling
* g_icon_new_for_string(); icon theme changes aren't normal */
if (g_str_has_prefix (cache_key, CACHE_PREFIX_ICON))
g_hash_table_iter_remove (&iter);
}
}
static void
on_icon_theme_changed (GtkIconTheme *icon_theme,
StTextureCache *cache)
{
st_texture_cache_evict_icons (cache);
g_signal_emit (cache, signals[ICON_THEME_CHANGED], 0);
}
static void
st_texture_cache_init (StTextureCache *self)
{
self->priv = g_new0 (StTextureCachePrivate, 1);
self->priv->icon_theme = gtk_icon_theme_get_default ();
g_signal_connect (self->priv->icon_theme, "changed",
G_CALLBACK (on_icon_theme_changed), self);
self->priv->keyed_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, cogl_handle_unref);
self->priv->outstanding_requests = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, NULL);
}
static void
st_texture_cache_dispose (GObject *object)
{
StTextureCache *self = (StTextureCache*)object;
if (self->priv->icon_theme)
{
g_signal_handlers_disconnect_by_func (self->priv->icon_theme,
(gpointer) on_icon_theme_changed,
self);
self->priv->icon_theme = NULL;
}
if (self->priv->keyed_cache)
g_hash_table_destroy (self->priv->keyed_cache);
self->priv->keyed_cache = NULL;
if (self->priv->outstanding_requests)
g_hash_table_destroy (self->priv->outstanding_requests);
self->priv->outstanding_requests = NULL;
G_OBJECT_CLASS (st_texture_cache_parent_class)->dispose (object);
}
static void
st_texture_cache_finalize (GObject *object)
{
G_OBJECT_CLASS (st_texture_cache_parent_class)->finalize (object);
}
static gboolean
compute_pixbuf_scale (gint width,
gint height,
gint available_width,
gint available_height,
gint *new_width,
gint *new_height)
{
int scaled_width, scaled_height;
if (width == 0 || height == 0)
return FALSE;
if (available_width >= 0 && available_height >= 0)
{
/* This should keep the aspect ratio of the image intact, because if
* available_width < (available_height * width) / height
* then
* (available_width * height) / width < available_height
* So we are guaranteed to either scale the image to have an available_width
* for width and height scaled accordingly OR have the available_height
* for height and width scaled accordingly, whichever scaling results
* in the image that can fit both available dimensions.
*/
scaled_width = MIN (available_width, (available_height * width) / height);
scaled_height = MIN (available_height, (available_width * height) / width);
}
else if (available_width >= 0)
{
scaled_width = available_width;
scaled_height = (available_width * height) / width;
}
else if (available_height >= 0)
{
scaled_width = (available_height * width) / height;
scaled_height = available_height;
}
else
{
scaled_width = scaled_height = 0;
}
/* Scale the image only if that will not increase its original dimensions. */
if (scaled_width > 0 && scaled_height > 0 && scaled_width < width && scaled_height < height)
{
*new_width = scaled_width;
*new_height = scaled_height;
return TRUE;
}
return FALSE;
}
static void
rgba_from_clutter (GdkRGBA *rgba,
ClutterColor *color)
{
rgba->red = color->red / 255.;
rgba->green = color->green / 255.;
rgba->blue = color->blue / 255.;
rgba->alpha = color->alpha / 255.;
}
static GdkPixbuf *
impl_load_pixbuf_gicon (GtkIconInfo *info,
int size,
StIconColors *colors,
GError **error)
{
int scaled_width, scaled_height;
GdkPixbuf *pixbuf;
int width, height;
if (colors)
{
GdkRGBA foreground_color;
GdkRGBA success_color;
GdkRGBA warning_color;
GdkRGBA error_color;
rgba_from_clutter (&foreground_color, &colors->foreground);
rgba_from_clutter (&success_color, &colors->success);
rgba_from_clutter (&warning_color, &colors->warning);
rgba_from_clutter (&error_color, &colors->error);
pixbuf = gtk_icon_info_load_symbolic (info,
&foreground_color, &success_color,
&warning_color, &error_color,
NULL, error);
}
else
{
pixbuf = gtk_icon_info_load_icon (info, error);
}
if (!pixbuf)
return NULL;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
if (compute_pixbuf_scale (width,
height,
size, size,
&scaled_width, &scaled_height))
{
GdkPixbuf *scaled = gdk_pixbuf_scale_simple (pixbuf, width, height, GDK_INTERP_BILINEAR);
g_object_unref (pixbuf);
pixbuf = scaled;
}
return pixbuf;
}
/* A private structure for keeping width and height. */
typedef struct {
int width;
int height;
} Dimensions;
/* This struct corresponds to a request for an texture.
* It's creasted when something needs a new texture,
* and destroyed when the texture data is loaded. */
typedef struct {
StTextureCache *cache;
StTextureCachePolicy policy;
char *key;
gboolean enforced_square;
guint width;
guint height;
GSList *textures;
GtkIconInfo *icon_info;
StIconColors *colors;
char *uri;
} AsyncTextureLoadData;
static void
texture_load_data_destroy (gpointer p)
{
AsyncTextureLoadData *data = p;
if (data->icon_info)
{
gtk_icon_info_free (data->icon_info);
if (data->colors)
st_icon_colors_unref (data->colors);
}
else if (data->uri)
g_free (data->uri);
if (data->key)
g_free (data->key);
if (data->textures)
g_slist_free_full (data->textures, (GDestroyNotify) g_object_unref);
}
/**
* on_image_size_prepared:
*
* @pixbuf_loader: #GdkPixbufLoader loading the image
* @width: the original width of the image
* @height: the original height of the image
* @data: pointer to the #Dimensions sructure containing available width and height for the image,
* available width or height can be -1 if the dimension is not limited
*
* Private function.
*
* Sets the size of the image being loaded to fit the available width and height dimensions,
* but never scales up the image beyond its actual size.
* Intended to be used as a callback for #GdkPixbufLoader "size-prepared" signal.
*/
static void
on_image_size_prepared (GdkPixbufLoader *pixbuf_loader,
gint width,
gint height,
gpointer data)
{
Dimensions *available_dimensions = data;
int available_width = available_dimensions->width;
int available_height = available_dimensions->height;
int scaled_width;
int scaled_height;
if (compute_pixbuf_scale (width, height, available_width, available_height,
&scaled_width, &scaled_height))
gdk_pixbuf_loader_set_size (pixbuf_loader, scaled_width, scaled_height);
}
static GdkPixbuf *
impl_load_pixbuf_data (const guchar *data,
gsize size,
int available_width,
int available_height,
GError **error)
{
GdkPixbufLoader *pixbuf_loader = NULL;
GdkPixbuf *rotated_pixbuf = NULL;
GdkPixbuf *pixbuf;
gboolean success;
Dimensions available_dimensions;
int width_before_rotation, width_after_rotation;
pixbuf_loader = gdk_pixbuf_loader_new ();
available_dimensions.width = available_width;
available_dimensions.height = available_height;
g_signal_connect (pixbuf_loader, "size-prepared",
G_CALLBACK (on_image_size_prepared), &available_dimensions);
success = gdk_pixbuf_loader_write (pixbuf_loader, data, size, error);
if (!success)
goto out;
success = gdk_pixbuf_loader_close (pixbuf_loader, error);
if (!success)
goto out;
pixbuf = gdk_pixbuf_loader_get_pixbuf (pixbuf_loader);
width_before_rotation = gdk_pixbuf_get_width (pixbuf);
rotated_pixbuf = gdk_pixbuf_apply_embedded_orientation (pixbuf);
width_after_rotation = gdk_pixbuf_get_width (rotated_pixbuf);
/* There is currently no way to tell if the pixbuf will need to be rotated before it is loaded,
* so we only check that once it is loaded, and reload it again if it needs to be rotated in order
* to use the available width and height correctly.
* See http://bugzilla.gnome.org/show_bug.cgi?id=579003
*/
if (width_before_rotation != width_after_rotation)
{
g_object_unref (pixbuf_loader);
g_object_unref (rotated_pixbuf);
rotated_pixbuf = NULL;
pixbuf_loader = gdk_pixbuf_loader_new ();
/* We know that the image will later be rotated, so we reverse the available dimensions. */
available_dimensions.width = available_height;
available_dimensions.height = available_width;
g_signal_connect (pixbuf_loader, "size-prepared",
G_CALLBACK (on_image_size_prepared), &available_dimensions);
success = gdk_pixbuf_loader_write (pixbuf_loader, data, size, error);
if (!success)
goto out;
success = gdk_pixbuf_loader_close (pixbuf_loader, error);
if (!success)
goto out;
pixbuf = gdk_pixbuf_loader_get_pixbuf (pixbuf_loader);
rotated_pixbuf = gdk_pixbuf_apply_embedded_orientation (pixbuf);
}
out:
if (pixbuf_loader)
g_object_unref (pixbuf_loader);
return rotated_pixbuf;
}
static GdkPixbuf*
decode_image (const char *val)
{
int i;
GError *error = NULL;
GdkPixbuf *res = NULL;
struct {
const char *prefix;
const char *mime_type;
} formats[] = {
{ "data:image/x-icon;base64,", "image/x-icon" },
{ "data:image/png;base64,", "image/png" }
};
g_return_val_if_fail (val, NULL);
for (i = 0; i < G_N_ELEMENTS (formats); i++)
{
if (g_str_has_prefix (val, formats[i].prefix))
{
gsize len;
guchar *data = NULL;
char *unescaped;
unescaped = g_uri_unescape_string (val + strlen (formats[i].prefix), NULL);
if (unescaped)
{
data = g_base64_decode (unescaped, &len);
g_free (unescaped);
}
if (data)
{
GdkPixbufLoader *loader;
loader = gdk_pixbuf_loader_new_with_mime_type (formats[i].mime_type, &error);
if (loader &&
gdk_pixbuf_loader_write (loader, data, len, &error) &&
gdk_pixbuf_loader_close (loader, &error))
{
res = gdk_pixbuf_loader_get_pixbuf (loader);
g_object_ref (res);
}
g_object_unref (loader);
g_free (data);
}
}
}
if (!res)
{
if (error)
{
g_warning ("%s\n", error->message);
g_error_free (error);
}
else
g_warning ("incorrect data uri");
}
return res;
}
static GdkPixbuf *
impl_load_pixbuf_file (const char *uri,
int available_width,
int available_height,
GError **error)
{
GdkPixbuf *pixbuf = NULL;
GFile *file;
char *contents = NULL;
gsize size;
if (g_str_has_prefix (uri, "data:"))
return decode_image (uri);
file = g_file_new_for_uri (uri);
if (g_file_load_contents (file, NULL, &contents, &size, NULL, error))
{
pixbuf = impl_load_pixbuf_data ((const guchar *) contents, size,
available_width, available_height,
error);
}
g_object_unref (file);
g_free (contents);
return pixbuf;
}
static void
load_pixbuf_thread (GSimpleAsyncResult *result,
GObject *object,
GCancellable *cancellable)
{
GdkPixbuf *pixbuf;
AsyncTextureLoadData *data;
GError *error = NULL;
data = g_async_result_get_user_data (G_ASYNC_RESULT (result));
g_assert (data != NULL);
if (data->uri)
pixbuf = impl_load_pixbuf_file (data->uri, data->width, data->height, &error);
else if (data->icon_info)
pixbuf = impl_load_pixbuf_gicon (data->icon_info, data->width, data->colors, &error);
else
g_assert_not_reached ();
if (error != NULL)
{
g_simple_async_result_set_from_error (result, error);
return;
}
if (pixbuf)
g_simple_async_result_set_op_res_gpointer (result, g_object_ref (pixbuf),
g_object_unref);
}
static GdkPixbuf *
load_pixbuf_async_finish (StTextureCache *cache, GAsyncResult *result, GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
return g_simple_async_result_get_op_res_gpointer (simple);
}
static CoglHandle
pixbuf_to_cogl_handle (GdkPixbuf *pixbuf,
gboolean add_padding)
{
CoglHandle texture, offscreen;
CoglColor clear_color;
int width, height;
guint size;
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
size = MAX (width, height);
if (!add_padding || width == height)
return cogl_texture_new_from_data (width,
height,
COGL_TEXTURE_NONE,
gdk_pixbuf_get_has_alpha (pixbuf) ? COGL_PIXEL_FORMAT_RGBA_8888 : COGL_PIXEL_FORMAT_RGB_888,
COGL_PIXEL_FORMAT_ANY,
gdk_pixbuf_get_rowstride (pixbuf),
gdk_pixbuf_get_pixels (pixbuf));
texture = cogl_texture_new_with_size (size, size,
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_ANY);
offscreen = cogl_offscreen_new_to_texture (texture);
cogl_color_set_from_4ub (&clear_color, 0, 0, 0, 0);
cogl_push_framebuffer (offscreen);
cogl_clear (&clear_color, COGL_BUFFER_BIT_COLOR);
cogl_pop_framebuffer ();
cogl_handle_unref (offscreen);
cogl_texture_set_region (texture,
0, 0,
(size - width) / 2, (size - height) / 2,
width, height,
width, height,
gdk_pixbuf_get_has_alpha (pixbuf) ? COGL_PIXEL_FORMAT_RGBA_8888 : COGL_PIXEL_FORMAT_RGB_888,
gdk_pixbuf_get_rowstride (pixbuf),
gdk_pixbuf_get_pixels (pixbuf));
return texture;
}
static cairo_surface_t *
pixbuf_to_cairo_surface (GdkPixbuf *pixbuf)
{
cairo_surface_t *dummy_surface;
cairo_pattern_t *pattern;
cairo_surface_t *surface;
cairo_t *cr;
dummy_surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
cr = cairo_create (dummy_surface);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
pattern = cairo_get_source (cr);
cairo_pattern_get_surface (pattern, &surface);
cairo_surface_reference (surface);
cairo_destroy (cr);
cairo_surface_destroy (dummy_surface);
return surface;
}
static void
on_pixbuf_loaded (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GSList *iter;
StTextureCache *cache;
AsyncTextureLoadData *data;
GdkPixbuf *pixbuf;
GError *error = NULL;
CoglHandle texdata = NULL;
data = user_data;
cache = ST_TEXTURE_CACHE (source);
g_hash_table_remove (cache->priv->outstanding_requests, data->key);
pixbuf = load_pixbuf_async_finish (cache, result, &error);
if (pixbuf == NULL)
goto out;
texdata = pixbuf_to_cogl_handle (pixbuf, data->enforced_square);
g_object_unref (pixbuf);
if (data->policy != ST_TEXTURE_CACHE_POLICY_NONE)
{
gpointer orig_key, value;
if (!g_hash_table_lookup_extended (cache->priv->keyed_cache, data->key,
&orig_key, &value))
{
cogl_handle_ref (texdata);
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (data->key),
texdata);
}
}
for (iter = data->textures; iter; iter = iter->next)
{
ClutterTexture *texture = iter->data;
set_texture_cogl_texture (texture, texdata);
}
out:
if (texdata)
cogl_handle_unref (texdata);
texture_load_data_destroy (data);
g_free (data);
g_clear_error (&error);
}
static void
load_texture_async (StTextureCache *cache,
AsyncTextureLoadData *data)
{
GSimpleAsyncResult *result;
result = g_simple_async_result_new (G_OBJECT (cache), on_pixbuf_loaded, data, load_texture_async);
g_simple_async_result_run_in_thread (result, load_pixbuf_thread, G_PRIORITY_DEFAULT, NULL);
g_object_unref (result);
}
typedef struct {
StTextureCache *cache;
ClutterTexture *texture;
GObject *source;
guint notify_signal_id;
gboolean weakref_active;
} StTextureCachePropertyBind;
static void
st_texture_cache_reset_texture (StTextureCachePropertyBind *bind,
const char *propname)
{
GdkPixbuf *pixbuf;
CoglHandle texdata;
g_object_get (bind->source, propname, &pixbuf, NULL);
g_return_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf));
if (pixbuf != NULL)
{
texdata = pixbuf_to_cogl_handle (pixbuf, FALSE);
g_object_unref (pixbuf);
clutter_texture_set_cogl_texture (bind->texture, texdata);
cogl_handle_unref (texdata);
clutter_actor_set_opacity (CLUTTER_ACTOR (bind->texture), 255);
}
else
clutter_actor_set_opacity (CLUTTER_ACTOR (bind->texture), 0);
}
static void
st_texture_cache_on_pixbuf_notify (GObject *object,
GParamSpec *paramspec,
gpointer data)
{
StTextureCachePropertyBind *bind = data;
st_texture_cache_reset_texture (bind, paramspec->name);
}
static void
st_texture_cache_bind_weak_notify (gpointer data,
GObject *source_location)
{
StTextureCachePropertyBind *bind = data;
bind->weakref_active = FALSE;
g_signal_handler_disconnect (bind->source, bind->notify_signal_id);
}
static void
st_texture_cache_free_bind (gpointer data)
{
StTextureCachePropertyBind *bind = data;
if (bind->weakref_active)
g_object_weak_unref (G_OBJECT(bind->texture), st_texture_cache_bind_weak_notify, bind);
g_free (bind);
}
/**
* st_texture_cache_bind_pixbuf_property:
* @cache:
* @object: A #GObject with a property @property_name of type #GdkPixbuf
* @property_name: Name of a property
*
* Create a #ClutterTexture which tracks the #GdkPixbuf value of a GObject property
* named by @property_name. Unlike other methods in StTextureCache, the underlying
* CoglHandle is not shared by default with other invocations to this method.
*
* If the source object is destroyed, the texture will continue to show the last
* value of the property.
*
* Return value: (transfer none): A new #ClutterActor
*/
ClutterActor *
st_texture_cache_bind_pixbuf_property (StTextureCache *cache,
GObject *object,
const char *property_name)
{
ClutterTexture *texture;
gchar *notify_key;
StTextureCachePropertyBind *bind;
texture = CLUTTER_TEXTURE (clutter_texture_new ());
bind = g_new0 (StTextureCachePropertyBind, 1);
bind->cache = cache;
bind->texture = texture;
bind->source = object;
g_object_weak_ref (G_OBJECT (texture), st_texture_cache_bind_weak_notify, bind);
bind->weakref_active = TRUE;
st_texture_cache_reset_texture (bind, property_name);
notify_key = g_strdup_printf ("notify::%s", property_name);
bind->notify_signal_id = g_signal_connect_data (object, notify_key, G_CALLBACK(st_texture_cache_on_pixbuf_notify),
bind, (GClosureNotify)st_texture_cache_free_bind, 0);
g_free (notify_key);
return CLUTTER_ACTOR(texture);
}
/**
* st_texture_cache_load: (skip)
* @cache: A #StTextureCache
* @key: Arbitrary string used to refer to item
* @policy: Caching policy
* @load: Function to create the texture, if not already cached
* @data: User data passed to @load
* @error: A #GError
*
* Load an arbitrary texture, caching it. The string chosen for @key
* should be of the form "type-prefix:type-uuid". For example,
* "url:file:///usr/share/icons/hicolor/48x48/apps/firefox.png", or
* "stock-icon:gtk-ok".
*
* Returns: (transfer full): A newly-referenced handle to the texture
*/
CoglHandle
st_texture_cache_load (StTextureCache *cache,
const char *key,
StTextureCachePolicy policy,
StTextureCacheLoader load,
void *data,
GError **error)
{
CoglHandle texture;
texture = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (!texture)
{
texture = load (cache, key, data, error);
if (texture)
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), texture);
else
return COGL_INVALID_HANDLE;
}
cogl_handle_ref (texture);
return texture;
}
/**
* create_texture_and_ensure_request:
* @cache:
* @key: A cache key
* @size: Size in pixels
* @policy: Cache policy
* @request: (out): If no request is outstanding, one will be created and returned here
* @texture: (out): A new texture, also added to the request
*
* Check for any outstanding load for the data represented by @key. If there
* is already a request pending, append it to that request to avoid loading
* the data multiple times.
*
* Returns: %TRUE iff there is already a request pending
*/
static gboolean
create_texture_and_ensure_request (StTextureCache *cache,
const char *key,
guint size,
StTextureCachePolicy policy,
AsyncTextureLoadData **request,
ClutterActor **texture)
{
CoglHandle texdata;
AsyncTextureLoadData *pending;
gboolean had_pending;
*texture = (ClutterActor *) create_default_texture ();
clutter_actor_set_size (*texture, size, size);
texdata = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (texdata != NULL)
{
/* We had this cached already, just set the texture and we're done. */
set_texture_cogl_texture (CLUTTER_TEXTURE (*texture), texdata);
return TRUE;
}
pending = g_hash_table_lookup (cache->priv->outstanding_requests, key);
had_pending = pending != NULL;
if (pending == NULL)
{
/* Not cached and no pending request, create it */
*request = g_new0 (AsyncTextureLoadData, 1);
if (policy != ST_TEXTURE_CACHE_POLICY_NONE)
g_hash_table_insert (cache->priv->outstanding_requests, g_strdup (key), *request);
}
else
*request = pending;
/* Regardless of whether there was a pending request, prepend our texture here. */
(*request)->textures = g_slist_prepend ((*request)->textures, g_object_ref (*texture));
return had_pending;
}
static ClutterActor *
load_gicon_with_colors (StTextureCache *cache,
GIcon *icon,
gint size,
StIconColors *colors)
{
AsyncTextureLoadData *request;
ClutterActor *texture;
char *gicon_string;
char *key;
GtkIconTheme *theme;
GtkIconInfo *info;
StTextureCachePolicy policy;
/* Do theme lookups in the main thread to avoid thread-unsafety */
theme = cache->priv->icon_theme;
info = gtk_icon_theme_lookup_by_gicon (theme, icon, size, GTK_ICON_LOOKUP_USE_BUILTIN);
if (info == NULL)
return NULL;
gicon_string = g_icon_to_string (icon);
/* A return value of NULL indicates that the icon can not be serialized,
* so don't have a unique identifier for it as a cache key, and thus can't
* be cached. If it is cachable, we hardcode a policy of FOREVER here for
* now; we should actually blow this away on icon theme changes probably */
policy = gicon_string != NULL ? ST_TEXTURE_CACHE_POLICY_FOREVER
: ST_TEXTURE_CACHE_POLICY_NONE;
if (colors)
{
/* This raises some doubts about the practice of using string keys */
key = g_strdup_printf (CACHE_PREFIX_ICON "%s,size=%d,colors=%2x%2x%2x%2x,%2x%2x%2x%2x,%2x%2x%2x%2x,%2x%2x%2x%2x",
gicon_string, size,
colors->foreground.red, colors->foreground.blue, colors->foreground.green, colors->foreground.alpha,
colors->warning.red, colors->warning.blue, colors->warning.green, colors->warning.alpha,
colors->error.red, colors->error.blue, colors->error.green, colors->error.alpha,
colors->success.red, colors->success.blue, colors->success.green, colors->success.alpha);
}
else
{
key = g_strdup_printf (CACHE_PREFIX_ICON "%s,size=%d",
gicon_string, size);
}
g_free (gicon_string);
if (create_texture_and_ensure_request (cache, key, size, policy, &request, &texture))
{
/* If there's an outstanding request, we've just added ourselves to it */
g_free (key);
}
else
{
/* Else, make a new request */
request->cache = cache;
/* Transfer ownership of key */
request->key = key;
request->policy = policy;
request->colors = colors ? st_icon_colors_ref (colors) : NULL;
request->icon_info = info;
request->width = request->height = size;
request->enforced_square = TRUE;
load_texture_async (cache, request);
}
return CLUTTER_ACTOR (texture);
}
/**
* st_texture_cache_load_gicon:
* @cache: The texture cache instance
* @theme_node: (allow-none): The #StThemeNode to use for colors, or NULL
* if the icon must not be recolored
* @icon: the #GIcon to load
* @size: Size of themed
*
* This method returns a new #ClutterActor for a given #GIcon. If the
* icon isn't loaded already, the texture will be filled
* asynchronously.
*
* This will load @icon as a full-color icon; if you want a symbolic
* icon, you must use st_texture_cache_load_icon_name().
*
* Return Value: (transfer none): A new #ClutterActor for the icon, or %NULL if not found
*/
ClutterActor *
st_texture_cache_load_gicon (StTextureCache *cache,
StThemeNode *theme_node,
GIcon *icon,
gint size)
{
return load_gicon_with_colors (cache, icon, size, theme_node ? st_theme_node_get_icon_colors (theme_node) : NULL);
}
static ClutterActor *
load_from_pixbuf (GdkPixbuf *pixbuf)
{
ClutterTexture *texture;
CoglHandle texdata;
int width = gdk_pixbuf_get_width (pixbuf);
int height = gdk_pixbuf_get_height (pixbuf);
texture = create_default_texture ();
clutter_actor_set_size (CLUTTER_ACTOR (texture), width, height);
texdata = pixbuf_to_cogl_handle (pixbuf, FALSE);
set_texture_cogl_texture (texture, texdata);
cogl_handle_unref (texdata);
return CLUTTER_ACTOR (texture);
}
typedef struct {
gchar *path;
gint grid_width, grid_height;
ClutterActor *actor;
} AsyncImageData;
static void
on_data_destroy (gpointer data)
{
AsyncImageData *d = (AsyncImageData *)data;
g_free (d->path);
g_object_unref (d->actor);
g_free (d);
}
static void
on_sliced_image_loaded (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
AsyncImageData *data = (AsyncImageData *)user_data;
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
GList *list;
if (g_simple_async_result_propagate_error (simple, NULL))
return;
for (list = g_simple_async_result_get_op_res_gpointer (simple); list; list = g_list_next (list))
{
ClutterActor *actor = load_from_pixbuf (GDK_PIXBUF (list->data));
clutter_actor_hide (actor);
clutter_actor_add_child (data->actor, actor);
}
}
static void
free_glist_unref_gobjects (gpointer p)
{
GList *list = p;
GList *iter;
for (iter = list; iter; iter = iter->next)
g_object_unref (iter->data);
g_list_free (list);
}
static void
load_sliced_image (GSimpleAsyncResult *result,
GObject *object,
GCancellable *cancellable)
{
AsyncImageData *data;
GList *res = NULL;
GdkPixbuf *pix;
gint width, height, y, x;
g_assert (!cancellable);
data = g_object_get_data (G_OBJECT (result), "load_sliced_image");
g_assert (data);
if (!(pix = gdk_pixbuf_new_from_file (data->path, NULL)))
return;
width = gdk_pixbuf_get_width (pix);
height = gdk_pixbuf_get_height (pix);
for (y = 0; y < height; y += data->grid_height)
{
for (x = 0; x < width; x += data->grid_width)
{
GdkPixbuf *pixbuf = gdk_pixbuf_new_subpixbuf (pix, x, y, data->grid_width, data->grid_height);
g_assert (pixbuf != NULL);
res = g_list_append (res, pixbuf);
}
}
/* We don't need the original pixbuf anymore, though the subpixbufs
will hold a reference. */
g_object_unref (pix);
g_simple_async_result_set_op_res_gpointer (result, res, free_glist_unref_gobjects);
}
/**
* st_texture_cache_load_sliced_image:
* @cache: A #StTextureCache
* @path: Path to a filename
* @grid_width: Width in pixels
* @grid_height: Height in pixels
*
* This function reads a single image file which contains multiple images internally.
* The image file will be divided using @grid_width and @grid_height;
* note that the dimensions of the image loaded from @path
* should be a multiple of the specified grid dimensions.
*
* Returns: (transfer none): A new #ClutterActor
*/
ClutterActor *
st_texture_cache_load_sliced_image (StTextureCache *cache,
const gchar *path,
gint grid_width,
gint grid_height)
{
AsyncImageData *data;
GSimpleAsyncResult *result;
ClutterActor *actor = clutter_actor_new ();
data = g_new0 (AsyncImageData, 1);
data->grid_width = grid_width;
data->grid_height = grid_height;
data->path = g_strdup (path);
data->actor = actor;
g_object_ref (G_OBJECT (actor));
result = g_simple_async_result_new (G_OBJECT (cache), on_sliced_image_loaded, data, st_texture_cache_load_sliced_image);
g_object_set_data_full (G_OBJECT (result), "load_sliced_image", data, on_data_destroy);
g_simple_async_result_run_in_thread (result, load_sliced_image, G_PRIORITY_DEFAULT, NULL);
g_object_unref (result);
return actor;
}
/**
* StIconType:
* @ST_ICON_SYMBOLIC: a symbolic (ie, mostly monochrome) icon
* @ST_ICON_FULLCOLOR: a full-color icon
*
* Describes what style of icon is desired in a call to
* st_texture_cache_load_icon_name() or st_texture_cache_load_gicon().
* Use %ST_ICON_SYMBOLIC for symbolic icons (eg, for the panel and
* much of the rest of the shell chrome) or %ST_ICON_FULLCOLOR for a
* full-color icon.
*/
/* generates names like g_themed_icon_new_with_default_fallbacks(),
* but *only* symbolic names
*/
static char **
symbolic_names_for_icon (const char *name)
{
char **parts, **names;
int i, numnames;
parts = g_strsplit (name, "-", -1);
numnames = g_strv_length (parts);
names = g_new (char *, numnames + 1);
for (i = 0; parts[i]; i++)
{
if (i == 0)
{
names[i] = g_strdup_printf ("%s-symbolic", parts[i]);
}
else
{
names[i] = g_strdup_printf ("%.*s-%s-symbolic",
(int) (strlen (names[i - 1]) - strlen ("-symbolic")),
names[i - 1], parts[i]);
}
}
names[i] = NULL;
g_strfreev (parts);
/* need to reverse here, because longest (most specific)
name has to come first */
for (i = 0; i < (numnames / 2); i++) {
char *tmp = names[i];
names[i] = names[numnames - i - 1];
names[numnames - i - 1] = tmp;
}
return names;
}
/**
* st_texture_cache_load_icon_name:
* @cache: The texture cache instance
* @theme_node: (allow-none): a #StThemeNode
* @name: Name of a themed icon
* @icon_type: the type of icon to load
* @size: Size of themed icon
*
* Load a themed icon into a texture. See the #StIconType documentation
* for an explanation of how @icon_type affects the returned icon. The
* colors used for symbolic icons are derived from @theme_node.
*
* Return Value: (transfer none): A new #ClutterTexture for the icon
*/
ClutterActor *
st_texture_cache_load_icon_name (StTextureCache *cache,
StThemeNode *theme_node,
const char *name,
StIconType icon_type,
gint size)
{
ClutterActor *texture;
GIcon *themed;
char **names;
g_return_val_if_fail (!(icon_type == ST_ICON_SYMBOLIC && theme_node == NULL), NULL);
switch (icon_type)
{
case ST_ICON_SYMBOLIC:
names = symbolic_names_for_icon (name);
themed = g_themed_icon_new_from_names (names, -1);
g_strfreev (names);
texture = load_gicon_with_colors (cache, themed, size,
st_theme_node_get_icon_colors (theme_node));
g_object_unref (themed);
if (texture == NULL)
{
/* We don't have an equivalent of image-missing
* for the symbolic icon theme, so just create a blank
* actor. */
texture = clutter_actor_new ();
clutter_actor_set_size (texture, size, size);
}
return texture;
break;
case ST_ICON_FULLCOLOR:
themed = g_themed_icon_new_with_default_fallbacks (name);
texture = load_gicon_with_colors (cache, themed, size, NULL);
g_object_unref (themed);
if (texture == NULL)
{
themed = g_themed_icon_new ("image-missing");
texture = load_gicon_with_colors (cache, themed, size, NULL);
g_object_unref (themed);
}
return texture;
break;
default:
g_assert_not_reached ();
}
}
/**
* st_texture_cache_load_uri_async:
*
* @cache: The texture cache instance
* @uri: uri of the image file from which to create a pixbuf
* @available_width: available width for the image, can be -1 if not limited
* @available_height: available height for the image, can be -1 if not limited
*
* Asynchronously load an image. Initially, the returned texture will have a natural
* size of zero. At some later point, either the image will be loaded successfully
* and at that point size will be negotiated, or upon an error, no image will be set.
*
* Return value: (transfer none): A new #ClutterActor with no image loaded initially.
*/
ClutterActor *
st_texture_cache_load_uri_async (StTextureCache *cache,
const gchar *uri,
int available_width,
int available_height)
{
ClutterTexture *texture;
AsyncTextureLoadData *data;
texture = create_default_texture ();
data = g_new0 (AsyncTextureLoadData, 1);
data->cache = cache;
data->key = g_strconcat (CACHE_PREFIX_URI, uri, NULL);
data->policy = ST_TEXTURE_CACHE_POLICY_NONE;
data->uri = g_strdup (uri);
data->width = available_width;
data->height = available_height;
data->textures = g_slist_prepend (data->textures, g_object_ref (texture));
load_texture_async (cache, data);
return CLUTTER_ACTOR (texture);
}
static CoglHandle
st_texture_cache_load_uri_sync_to_cogl_texture (StTextureCache *cache,
StTextureCachePolicy policy,
const gchar *uri,
int available_width,
int available_height,
GError **error)
{
CoglHandle texdata;
GdkPixbuf *pixbuf;
char *key;
key = g_strconcat (CACHE_PREFIX_URI, uri, NULL);
texdata = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (texdata == NULL)
{
pixbuf = impl_load_pixbuf_file (uri, available_width, available_height, error);
if (!pixbuf)
goto out;
texdata = pixbuf_to_cogl_handle (pixbuf, FALSE);
g_object_unref (pixbuf);
if (policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
{
cogl_handle_ref (texdata);
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), texdata);
}
}
else
cogl_handle_ref (texdata);
out:
g_free (key);
return texdata;
}
static cairo_surface_t *
st_texture_cache_load_uri_sync_to_cairo_surface (StTextureCache *cache,
StTextureCachePolicy policy,
const gchar *uri,
int available_width,
int available_height,
GError **error)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
char *key;
key = g_strconcat (CACHE_PREFIX_URI_FOR_CAIRO, uri, NULL);
surface = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (surface == NULL)
{
pixbuf = impl_load_pixbuf_file (uri, available_width, available_height, error);
if (!pixbuf)
goto out;
surface = pixbuf_to_cairo_surface (pixbuf);
g_object_unref (pixbuf);
if (policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
{
cairo_surface_reference (surface);
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), surface);
}
}
else
cairo_surface_reference (surface);
out:
g_free (key);
return surface;
}
/**
* st_texture_cache_load_uri_sync:
*
* @cache: The texture cache instance
* @policy: Requested lifecycle of cached data
* @uri: uri of the image file from which to create a pixbuf
* @available_width: available width for the image, can be -1 if not limited
* @available_height: available height for the image, can be -1 if not limited
* @error: Return location for error
*
* Synchronously load an image from a uri. The image is scaled down to fit the
* available width and height imensions, but the image is never scaled up beyond
* its actual size. The pixbuf is rotated according to the associated orientation
* setting.
*
* Return value: (transfer none): A new #ClutterActor with the image file loaded if it was
* generated succesfully, %NULL otherwise
*/
ClutterActor *
st_texture_cache_load_uri_sync (StTextureCache *cache,
StTextureCachePolicy policy,
const gchar *uri,
int available_width,
int available_height,
GError **error)
{
CoglHandle texdata;
ClutterTexture *texture;
texdata = st_texture_cache_load_uri_sync_to_cogl_texture (cache, policy, uri, available_width, available_height, error);
if (texdata == COGL_INVALID_HANDLE)
return NULL;
texture = create_default_texture ();
set_texture_cogl_texture (texture, texdata);
cogl_handle_unref (texdata);
return CLUTTER_ACTOR (texture);
}
/**
* st_texture_cache_load_file_to_cogl_texture:
* @cache: A #StTextureCache
* @file_path: Path to a file in supported image format
*
* This function synchronously loads the given file path
* into a COGL texture. On error, a warning is emitted
* and %COGL_INVALID_HANDLE is returned.
*
* Returns: (transfer full): a new #CoglHandle
*/
CoglHandle
st_texture_cache_load_file_to_cogl_texture (StTextureCache *cache,
const gchar *file_path)
{
CoglHandle texture;
GFile *file;
char *uri;
GError *error = NULL;
file = g_file_new_for_path (file_path);
uri = g_file_get_uri (file);
texture = st_texture_cache_load_uri_sync_to_cogl_texture (cache, ST_TEXTURE_CACHE_POLICY_FOREVER,
uri, -1, -1, &error);
g_object_unref (file);
g_free (uri);
if (texture == NULL)
{
g_warning ("Failed to load %s: %s", file_path, error->message);
g_clear_error (&error);
return COGL_INVALID_HANDLE;
}
return texture;
}
/**
* st_texture_cache_load_file_to_cairo_surface:
* @cache: A #StTextureCache
* @file_path: Path to a file in supported image format
*
* This function synchronously loads the given file path
* into a cairo surface. On error, a warning is emitted
* and %NULL is returned.
*
* Returns: (transfer full): a new #cairo_surface_t
*/
cairo_surface_t *
st_texture_cache_load_file_to_cairo_surface (StTextureCache *cache,
const gchar *file_path)
{
cairo_surface_t *surface;
GFile *file;
char *uri;
GError *error = NULL;
file = g_file_new_for_path (file_path);
uri = g_file_get_uri (file);
surface = st_texture_cache_load_uri_sync_to_cairo_surface (cache, ST_TEXTURE_CACHE_POLICY_FOREVER,
uri, -1, -1, &error);
g_object_unref (file);
g_free (uri);
if (surface == NULL)
{
g_warning ("Failed to load %s: %s", file_path, error->message);
g_clear_error (&error);
return NULL;
}
return surface;
}
/**
* st_texture_cache_load_file_simple:
* @cache: A #StTextureCache
* @file_path: Filesystem path
*
* Synchronously load an image into a texture. The texture will be cached
* indefinitely. On error, this function returns an empty texture and prints a warning.
*
* Returns: (transfer none): A new #ClutterTexture
*/
ClutterActor *
st_texture_cache_load_file_simple (StTextureCache *cache,
const gchar *file_path)
{
GFile *file;
char *uri;
ClutterActor *texture;
GError *error = NULL;
file = g_file_new_for_path (file_path);
uri = g_file_get_uri (file);
texture = st_texture_cache_load_uri_sync (cache, ST_TEXTURE_CACHE_POLICY_FOREVER,
uri, -1, -1, &error);
if (texture == NULL)
{
g_warning ("Failed to load %s: %s", file_path, error->message);
g_clear_error (&error);
texture = clutter_texture_new ();
}
return texture;
}
/**
* st_texture_cache_load_from_raw:
* @cache: a #StTextureCache
* @data: (array length=len): raw pixel data
* @len: the length of @data
* @has_alpha: whether @data includes an alpha channel
* @width: width in pixels of @data
* @height: width in pixels of @data
* @rowstride: rowstride of @data
* @size: size of icon to return
*
* Creates (or retrieves from cache) an icon based on raw pixel data.
*
* Return value: (transfer none): a new #ClutterActor displaying a
* pixbuf created from @data and the other parameters.
**/
ClutterActor *
st_texture_cache_load_from_raw (StTextureCache *cache,
const guchar *data,
gsize len,
gboolean has_alpha,
int width,
int height,
int rowstride,
int size,
GError **error)
{
ClutterTexture *texture;
CoglHandle texdata;
char *key;
char *checksum;
texture = create_default_texture ();
clutter_actor_set_size (CLUTTER_ACTOR (texture), size, size);
/* In theory, two images of with different width and height could have the same
* pixel data and thus hash the same. (Say, a 16x16 and a 8x32 blank image.)
* We ignore this for now. If anybody hits this problem they should use
* GChecksum directly to compute a checksum including the width and height.
*/
checksum = g_compute_checksum_for_data (G_CHECKSUM_SHA1, data, len);
key = g_strdup_printf (CACHE_PREFIX_RAW_CHECKSUM "checksum=%s", checksum);
g_free (checksum);
texdata = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (texdata == NULL)
{
texdata = cogl_texture_new_from_data (width, height, COGL_TEXTURE_NONE,
has_alpha ? COGL_PIXEL_FORMAT_RGBA_8888 : COGL_PIXEL_FORMAT_RGB_888,
COGL_PIXEL_FORMAT_ANY,
rowstride, data);
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), texdata);
}
g_free (key);
set_texture_cogl_texture (texture, texdata);
return CLUTTER_ACTOR (texture);
}
static StTextureCache *instance = NULL;
/**
* st_texture_cache_get_default:
*
* Return value: (transfer none): The global texture cache
*/
StTextureCache*
st_texture_cache_get_default (void)
{
if (instance == NULL)
instance = g_object_new (ST_TYPE_TEXTURE_CACHE, NULL);
return instance;
}
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