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135d178d08
gnome-shell/src/st/st-texture-cache.c
Robert Mader 135d178d08 cleanup: Use g_clear_signal_handler() where possible 
`g_clear_signal_handler()` is usually cleaner and saver than
`g_signal_handler_disconnect()`. We use it new code, lets also
adopt the existing one.

See also https://gitlab.gnome.org/GNOME/mutter/merge_requests/868
and https://gitlab.gnome.org/GNOME/mutter/merge_requests/940

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/842
2019-11-21 22:37:37 +00:00

1578 lines
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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-image-content.h"
#include "st-texture-cache.h"
#include "st-private.h"
#include "st-settings.h"
#include <gtk/gtk.h>
#include <math.h>
#include <string.h>
#include <glib.h>
#define CACHE_PREFIX_ICON "icon:"
#define CACHE_PREFIX_FILE "file:"
#define CACHE_PREFIX_FILE_FOR_CAIRO "file-for-cairo:"
struct _StTextureCachePrivate
{
GtkIconTheme *icon_theme;
GSettings *settings;
/* Things that were loaded with a cache policy != NONE */
GHashTable *keyed_cache; /* char * -> ClutterImage* */
GHashTable *keyed_surface_cache; /* char * -> cairo_surface_t* */
/* Presently this is used to de-duplicate requests for GIcons and async URIs. */
GHashTable *outstanding_requests; /* char * -> AsyncTextureLoadData * */
/* File monitors to evict cache data on changes */
GHashTable *file_monitors; /* char * -> GFileMonitor * */
};
static void st_texture_cache_dispose (GObject *object);
static void st_texture_cache_finalize (GObject *object);
enum
{
ICON_THEME_CHANGED,
TEXTURE_FILE_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
* pipeline for an empty texture is full opacity white, which we
* definitely don't want. Skip that by setting 0 opacity.
*/
static ClutterActor *
create_invisible_actor (void)
{
return g_object_new (CLUTTER_TYPE_ACTOR,
"opacity", 0,
"request-mode", CLUTTER_REQUEST_CONTENT_SIZE,
NULL);
}
/* Reverse the opacity we added while loading */
static void
set_content_from_image (ClutterActor *actor,
ClutterContent *image)
{
g_assert (image && CLUTTER_IS_IMAGE (image));
clutter_actor_set_content (actor, image);
clutter_actor_set_opacity (actor, 255);
}
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);
signals[TEXTURE_FILE_CHANGED] =
g_signal_new ("texture-file-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0, /* no default handler slot */
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_FILE);
}
/* 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 (StSettings *settings,
GParamSpec *pspec,
StTextureCache *cache)
{
g_autofree gchar *theme;
st_texture_cache_evict_icons (cache);
g_object_get (settings, "gtk-icon-theme", &theme, NULL);
gtk_icon_theme_set_custom_theme (cache->priv->icon_theme, theme);
g_signal_emit (cache, signals[ICON_THEME_CHANGED], 0);
}
static void
on_gtk_icon_theme_changed (GtkIconTheme *icon_theme,
StTextureCache *self)
{
st_texture_cache_evict_icons (self);
g_signal_emit (self, signals[ICON_THEME_CHANGED], 0);
}
static void
st_texture_cache_init (StTextureCache *self)
{
StSettings *settings;
self->priv = g_new0 (StTextureCachePrivate, 1);
self->priv->icon_theme = gtk_icon_theme_new ();
gtk_icon_theme_add_resource_path (self->priv->icon_theme,
"/org/gnome/shell/theme/icons");
g_signal_connect (self->priv->icon_theme, "changed",
G_CALLBACK (on_gtk_icon_theme_changed), self);
settings = st_settings_get ();
g_signal_connect (settings, "notify::gtk-icon-theme",
G_CALLBACK (on_icon_theme_changed), self);
self->priv->keyed_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, g_object_unref);
self->priv->keyed_surface_cache = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
(GDestroyNotify) cairo_surface_destroy);
self->priv->outstanding_requests = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, NULL);
self->priv->file_monitors = g_hash_table_new_full (g_file_hash, (GEqualFunc) g_file_equal,
g_object_unref, g_object_unref);
on_icon_theme_changed (settings, NULL, self);
}
static void
st_texture_cache_dispose (GObject *object)
{
StTextureCache *self = (StTextureCache*)object;
g_clear_object (&self->priv->settings);
g_clear_object (&self->priv->icon_theme);
g_clear_pointer (&self->priv->keyed_cache, g_hash_table_destroy);
g_clear_pointer (&self->priv->keyed_surface_cache, g_hash_table_destroy);
g_clear_pointer (&self->priv->outstanding_requests, g_hash_table_destroy);
g_clear_pointer (&self->priv->file_monitors, g_hash_table_destroy);
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 void
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)
{
*new_width = *new_height = 0;
return;
}
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;
}
else
{
*new_width = width;
*new_height = height;
}
}
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.;
}
/* A private structure for keeping width, height and scale. */
typedef struct {
int width;
int height;
int scale;
} 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;
guint width;
guint height;
guint paint_scale;
gfloat resource_scale;
GSList *actors;
GtkIconInfo *icon_info;
StIconColors *colors;
GFile *file;
} AsyncTextureLoadData;
static void
texture_load_data_free (gpointer p)
{
AsyncTextureLoadData *data = p;
if (data->icon_info)
{
g_object_unref (data->icon_info);
if (data->colors)
st_icon_colors_unref (data->colors);
}
else if (data->file)
g_object_unref (data->file);
if (data->key)
g_free (data->key);
if (data->actors)
g_slist_free_full (data->actors, (GDestroyNotify) g_object_unref);
g_slice_free (AsyncTextureLoadData, data);
}
/**
* 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 scale_factor = available_dimensions->scale;
int scaled_width;
int scaled_height;
compute_pixbuf_scale (width, height, available_width, available_height,
&scaled_width, &scaled_height);
gdk_pixbuf_loader_set_size (pixbuf_loader,
scaled_width * scale_factor,
scaled_height * scale_factor);
}
static GdkPixbuf *
impl_load_pixbuf_data (const guchar *data,
gsize size,
int available_width,
int available_height,
int scale,
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;
available_dimensions.scale = scale;
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;
available_dimensions.scale = scale;
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 *
impl_load_pixbuf_file (GFile *file,
int available_width,
int available_height,
int paint_scale,
float resource_scale,
GError **error)
{
GdkPixbuf *pixbuf = NULL;
char *contents = NULL;
gsize size;
if (g_file_load_contents (file, NULL, &contents, &size, NULL, error))
{
int scale = ceilf (paint_scale * resource_scale);
pixbuf = impl_load_pixbuf_data ((const guchar *) contents, size,
available_width, available_height,
scale,
error);
}
g_free (contents);
return pixbuf;
}
static void
load_pixbuf_thread (GTask *result,
gpointer source,
gpointer task_data,
GCancellable *cancellable)
{
GdkPixbuf *pixbuf;
AsyncTextureLoadData *data = task_data;
GError *error = NULL;
g_assert (data != NULL);
g_assert (data->file != NULL);
pixbuf = impl_load_pixbuf_file (data->file, data->width, data->height,
data->paint_scale, data->resource_scale,
&error);
if (error != NULL)
g_task_return_error (result, error);
else if (pixbuf)
g_task_return_pointer (result, g_object_ref (pixbuf), g_object_unref);
g_clear_object (&pixbuf);
}
static GdkPixbuf *
load_pixbuf_async_finish (StTextureCache *cache, GAsyncResult *result, GError **error)
{
return g_task_propagate_pointer (G_TASK (result), error);
}
static ClutterContent *
pixbuf_to_st_content_image (GdkPixbuf *pixbuf,
int width,
int height,
int paint_scale,
float resource_scale)
{
ClutterContent *image;
g_autoptr(GError) error = NULL;
float native_width, native_height;
native_width = ceilf (gdk_pixbuf_get_width (pixbuf) / resource_scale);
native_height = ceilf (gdk_pixbuf_get_height (pixbuf) / resource_scale);
if (width < 0 && height < 0)
{
width = native_width;
height = native_height;
}
else if (width < 0)
{
height *= paint_scale;
width = native_width * (height / native_height);
}
else if (height < 0)
{
width *= paint_scale;
height = native_height * (width / native_width);
}
else
{
width *= paint_scale;
height *= paint_scale;
}
image = st_image_content_new_with_preferred_size (width, height);
clutter_image_set_data (CLUTTER_IMAGE (image),
gdk_pixbuf_get_pixels (pixbuf),
gdk_pixbuf_get_has_alpha (pixbuf) ?
COGL_PIXEL_FORMAT_RGBA_8888 : COGL_PIXEL_FORMAT_RGB_888,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
gdk_pixbuf_get_rowstride (pixbuf),
&error);
if (error)
{
g_warning ("Failed to allocate texture: %s", error->message);
g_clear_object (&image);
}
return image;
}
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
finish_texture_load (AsyncTextureLoadData *data,
GdkPixbuf *pixbuf)
{
g_autoptr(ClutterContent) image = NULL;
GSList *iter;
StTextureCache *cache;
cache = data->cache;
g_hash_table_remove (cache->priv->outstanding_requests, data->key);
if (pixbuf == NULL)
goto out;
if (data->policy != ST_TEXTURE_CACHE_POLICY_NONE)
{
gpointer orig_key = NULL, value = NULL;
if (!g_hash_table_lookup_extended (cache->priv->keyed_cache, data->key,
&orig_key, &value))
{
image = pixbuf_to_st_content_image (pixbuf,
data->width, data->height,
data->paint_scale,
data->resource_scale);
if (!image)
goto out;
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (data->key),
g_object_ref (image));
}
else
{
image = g_object_ref (value);
}
}
else
{
image = pixbuf_to_st_content_image (pixbuf,
data->width, data->height,
data->paint_scale,
data->resource_scale);
if (!image)
goto out;
}
for (iter = data->actors; iter; iter = iter->next)
{
ClutterActor *actor = iter->data;
set_content_from_image (actor, image);
}
out:
texture_load_data_free (data);
}
static void
on_symbolic_icon_loaded (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GdkPixbuf *pixbuf;
pixbuf = gtk_icon_info_load_symbolic_finish (GTK_ICON_INFO (source), result, NULL, NULL);
finish_texture_load (user_data, pixbuf);
g_clear_object (&pixbuf);
}
static void
on_icon_loaded (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GdkPixbuf *pixbuf;
pixbuf = gtk_icon_info_load_icon_finish (GTK_ICON_INFO (source), result, NULL);
finish_texture_load (user_data, pixbuf);
g_clear_object (&pixbuf);
}
static void
on_pixbuf_loaded (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GdkPixbuf *pixbuf;
pixbuf = load_pixbuf_async_finish (ST_TEXTURE_CACHE (source), result, NULL);
finish_texture_load (user_data, pixbuf);
g_clear_object (&pixbuf);
}
static void
load_texture_async (StTextureCache *cache,
AsyncTextureLoadData *data)
{
if (data->file)
{
GTask *task = g_task_new (cache, NULL, on_pixbuf_loaded, data);
g_task_set_task_data (task, data, NULL);
g_task_run_in_thread (task, load_pixbuf_thread);
g_object_unref (task);
}
else if (data->icon_info)
{
StIconColors *colors = data->colors;
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);
gtk_icon_info_load_symbolic_async (data->icon_info,
&foreground_color, &success_color,
&warning_color, &error_color,
NULL, on_symbolic_icon_loaded, data);
}
else
{
gtk_icon_info_load_icon_async (data->icon_info, NULL, on_icon_loaded, data);
}
}
else
g_assert_not_reached ();
}
typedef struct {
StTextureCache *cache;
ClutterActor *actor;
gint size;
GObject *source;
gulong notify_signal_id;
gboolean weakref_active;
} StTextureCachePropertyBind;
static void
st_texture_cache_reset_texture (StTextureCachePropertyBind *bind,
const char *propname)
{
cairo_surface_t *surface;
g_object_get (bind->source, propname, &surface, NULL);
if (surface != NULL &&
cairo_surface_get_type (surface) == CAIRO_SURFACE_TYPE_IMAGE &&
(cairo_image_surface_get_format (surface) == CAIRO_FORMAT_ARGB32 ||
cairo_image_surface_get_format (surface) == CAIRO_FORMAT_RGB24))
{
g_autoptr(ClutterContent) image = NULL;
g_autoptr(GError) error = NULL;
int size = bind->size;
if (size < 0)
clutter_actor_get_preferred_width (bind->actor, -1, NULL, (float *)&size);
image = clutter_actor_get_content (bind->actor);
if (!image || !CLUTTER_IS_IMAGE (image))
image = st_image_content_new_with_preferred_size (size, size);
else
g_object_ref (image);
clutter_image_set_data (CLUTTER_IMAGE (image),
cairo_image_surface_get_data (surface),
cairo_image_surface_get_format (surface) == CAIRO_FORMAT_ARGB32 ?
COGL_PIXEL_FORMAT_BGRA_8888 : COGL_PIXEL_FORMAT_BGR_888,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface),
cairo_image_surface_get_stride (surface),
&error);
if (image)
clutter_actor_set_content (bind->actor, image);
else if (error)
g_warning ("Failed to allocate texture: %s", error->message);
clutter_actor_set_opacity (bind->actor, 255);
}
else
clutter_actor_set_opacity (bind->actor, 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_clear_signal_handler (&bind->notify_signal_id, bind->source);
}
static void
st_texture_cache_free_bind (gpointer data)
{
StTextureCachePropertyBind *bind = data;
if (bind->weakref_active)
g_object_weak_unref (G_OBJECT (bind->actor), st_texture_cache_bind_weak_notify, bind);
g_slice_free (StTextureCachePropertyBind, bind);
}
/**
* st_texture_cache_bind_cairo_surface_property:
* @cache:
* @object: A #GObject with a property @property_name of type #GdkPixbuf
* @property_name: Name of a property
*
* Create a #ClutterActor which tracks the #cairo_surface_t value of a GObject property
* named by @property_name. Unlike other methods in StTextureCache, the underlying
* #CoglTexture 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 #StWidget
*/
StWidget *
st_texture_cache_bind_cairo_surface_property (StTextureCache *cache,
GObject *object,
const char *property_name,
gint size)
{
StWidget *widget;
gchar *notify_key;
StTextureCachePropertyBind *bind;
widget = g_object_new (ST_TYPE_WIDGET,
"opacity", 0,
"width", (float)size,
"height", (float)size,
NULL);
bind = g_slice_new0 (StTextureCachePropertyBind);
bind->cache = cache;
bind->actor = CLUTTER_ACTOR (widget);
bind->size = size;
bind->source = object;
g_object_weak_ref (G_OBJECT (widget), 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 widget;
}
/**
* 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
*/
CoglTexture *
st_texture_cache_load (StTextureCache *cache,
const char *key,
StTextureCachePolicy policy,
StTextureCacheLoader load,
void *data,
GError **error)
{
CoglTexture *texture;
texture = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (!texture)
{
texture = load (cache, key, data, error);
if (texture && policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), texture);
}
if (texture && policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
cogl_object_ref (texture);
return texture;
}
/**
* ensure_request:
* @cache:
* @key: A cache key
* @policy: Cache policy
* @request: (out): If no request is outstanding, one will be created and returned here
* @texture: A texture to be 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 if there is already a request pending
*/
static gboolean
ensure_request (StTextureCache *cache,
const char *key,
StTextureCachePolicy policy,
AsyncTextureLoadData **request,
ClutterActor *actor)
{
ClutterContent *image;
AsyncTextureLoadData *pending;
gboolean had_pending;
image = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (image != NULL)
{
/* We had this cached already, just set the texture and we're done. */
set_content_from_image (actor, image);
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_slice_new0 (AsyncTextureLoadData);
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)->actors = g_slist_prepend ((*request)->actors, g_object_ref (actor));
return had_pending;
}
/**
* st_texture_cache_load_gicon:
* @cache: The texture cache instance
* @theme_node: (nullable): The #StThemeNode to use for colors, or NULL
* if the icon must not be recolored
* @icon: the #GIcon to load
* @size: Size of themed
* @paint_scale: Scale factor of display
* @resource_scale: Resource scale factor
*
* This method returns a new #ClutterActor for a given #GIcon. If the
* icon isn't loaded already, the texture will be filled
* asynchronously.
*
* 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,
gint paint_scale,
gfloat resource_scale)
{
AsyncTextureLoadData *request;
ClutterActor *actor;
gint scale;
char *gicon_string;
char *key;
float actor_size;
GtkIconTheme *theme;
GtkIconInfo *info;
StTextureCachePolicy policy;
StIconColors *colors = NULL;
StIconStyle icon_style = ST_ICON_STYLE_REQUESTED;
GtkIconLookupFlags lookup_flags;
if (theme_node)
{
colors = st_theme_node_get_icon_colors (theme_node);
icon_style = st_theme_node_get_icon_style (theme_node);
}
/* Do theme lookups in the main thread to avoid thread-unsafety */
theme = cache->priv->icon_theme;
lookup_flags = GTK_ICON_LOOKUP_USE_BUILTIN;
if (icon_style == ST_ICON_STYLE_REGULAR)
lookup_flags |= GTK_ICON_LOOKUP_FORCE_REGULAR;
else if (icon_style == ST_ICON_STYLE_SYMBOLIC)
lookup_flags |= GTK_ICON_LOOKUP_FORCE_SYMBOLIC;
if (clutter_get_default_text_direction () == CLUTTER_TEXT_DIRECTION_RTL)
lookup_flags |= GTK_ICON_LOOKUP_DIR_RTL;
else
lookup_flags |= GTK_ICON_LOOKUP_DIR_LTR;
scale = ceilf (paint_scale * resource_scale);
info = gtk_icon_theme_lookup_by_gicon_for_scale (theme, icon,
size, scale,
lookup_flags);
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,scale=%d,style=%d,colors=%2x%2x%2x%2x,%2x%2x%2x%2x,%2x%2x%2x%2x,%2x%2x%2x%2x",
gicon_string, size, scale, icon_style,
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,scale=%d,style=%d",
gicon_string, size, scale, icon_style);
}
g_free (gicon_string);
actor = create_invisible_actor ();
actor_size = size * paint_scale;
clutter_actor_set_size (actor, actor_size, actor_size);
if (ensure_request (cache, key, policy, &request, actor))
{
/* If there's an outstanding request, we've just added ourselves to it */
g_object_unref (info);
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->paint_scale = paint_scale;
request->resource_scale = resource_scale;
load_texture_async (cache, request);
}
return actor;
}
static ClutterActor *
load_from_pixbuf (GdkPixbuf *pixbuf,
int paint_scale,
float resource_scale)
{
g_autoptr(ClutterContent) image = NULL;
ClutterActor *actor;
image = pixbuf_to_st_content_image (pixbuf, -1, -1, paint_scale, resource_scale);
actor = g_object_new (CLUTTER_TYPE_ACTOR,
"request-mode", CLUTTER_REQUEST_CONTENT_SIZE,
NULL);
clutter_actor_set_content (actor, image);
return actor;
}
static void
file_changed_cb (GFileMonitor *monitor,
GFile *file,
GFile *other,
GFileMonitorEvent event_type,
gpointer user_data)
{
StTextureCache *cache = user_data;
char *key;
guint file_hash;
if (event_type != G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT)
return;
file_hash = g_file_hash (file);
key = g_strdup_printf (CACHE_PREFIX_FILE "%u", file_hash);
g_hash_table_remove (cache->priv->keyed_cache, key);
g_free (key);
key = g_strdup_printf (CACHE_PREFIX_FILE_FOR_CAIRO "%u", file_hash);
g_hash_table_remove (cache->priv->keyed_surface_cache, key);
g_free (key);
g_signal_emit (cache, signals[TEXTURE_FILE_CHANGED], 0, file);
}
static void
ensure_monitor_for_file (StTextureCache *cache,
GFile *file)
{
StTextureCachePrivate *priv = cache->priv;
/* No point in trying to monitor files that are part of a
* GResource, since it does not support file monitoring.
*/
if (g_file_has_uri_scheme (file, "resource"))
return;
if (g_hash_table_lookup (priv->file_monitors, file) == NULL)
{
GFileMonitor *monitor = g_file_monitor_file (file, G_FILE_MONITOR_NONE,
NULL, NULL);
g_signal_connect (monitor, "changed",
G_CALLBACK (file_changed_cb), cache);
g_hash_table_insert (priv->file_monitors, g_object_ref (file), monitor);
}
}
typedef struct {
GFile *gfile;
gint grid_width, grid_height;
gint paint_scale;
gfloat resource_scale;
ClutterActor *actor;
GCancellable *cancellable;
GFunc load_callback;
gpointer load_callback_data;
} AsyncImageData;
static void
on_data_destroy (gpointer data)
{
AsyncImageData *d = (AsyncImageData *)data;
g_object_unref (d->gfile);
g_object_unref (d->actor);
g_object_unref (d->cancellable);
g_slice_free (AsyncImageData, d);
}
static void
on_sliced_image_actor_destroyed (ClutterActor *actor,
gpointer data)
{
GTask *task = data;
GCancellable *cancellable = g_task_get_cancellable (task);
g_cancellable_cancel (cancellable);
}
static void
on_sliced_image_loaded (GObject *source_object,
GAsyncResult *res,
gpointer user_data)
{
GObject *cache = source_object;
AsyncImageData *data = (AsyncImageData *)user_data;
GTask *task = G_TASK (res);
GList *list, *pixbufs;
if (g_task_had_error (task) || g_cancellable_is_cancelled (data->cancellable))
return;
pixbufs = g_task_propagate_pointer (task, NULL);
for (list = pixbufs; list; list = list->next)
{
ClutterActor *actor = load_from_pixbuf (GDK_PIXBUF (list->data),
data->paint_scale,
data->resource_scale);
clutter_actor_hide (actor);
clutter_actor_add_child (data->actor, actor);
}
g_list_free_full (pixbufs, g_object_unref);
g_signal_handlers_disconnect_by_func (data->actor,
on_sliced_image_actor_destroyed,
task);
if (data->load_callback != NULL)
data->load_callback (cache, data->load_callback_data);
}
static void
free_glist_unref_gobjects (gpointer p)
{
g_list_free_full (p, g_object_unref);
}
static void
on_loader_size_prepared (GdkPixbufLoader *loader,
gint width,
gint height,
gpointer user_data)
{
AsyncImageData *data = user_data;
int scale = ceilf (data->paint_scale * data->resource_scale);
gdk_pixbuf_loader_set_size (loader, width * scale, height * scale);
}
static void
load_sliced_image (GTask *result,
gpointer object,
gpointer task_data,
GCancellable *cancellable)
{
AsyncImageData *data;
GList *res = NULL;
GdkPixbuf *pix;
gint width, height, y, x;
gint scale_factor;
GdkPixbufLoader *loader;
GError *error = NULL;
gchar *buffer = NULL;
gsize length;
g_assert (cancellable);
data = task_data;
g_assert (data);
loader = gdk_pixbuf_loader_new ();
g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), data);
if (!g_file_load_contents (data->gfile, cancellable, &buffer, &length, NULL, &error))
{
g_warning ("Failed to open sliced image: %s", error->message);
goto out;
}
if (!gdk_pixbuf_loader_write (loader, (const guchar *) buffer, length, &error))
{
g_warning ("Failed to load image: %s", error->message);
goto out;
}
if (!gdk_pixbuf_loader_close (loader, NULL))
goto out;
pix = gdk_pixbuf_loader_get_pixbuf (loader);
width = gdk_pixbuf_get_width (pix);
height = gdk_pixbuf_get_height (pix);
scale_factor = ceilf (data->paint_scale * data->resource_scale);
for (y = 0; y < height; y += data->grid_height * scale_factor)
{
for (x = 0; x < width; x += data->grid_width * scale_factor)
{
GdkPixbuf *pixbuf = gdk_pixbuf_new_subpixbuf (pix, x, y,
data->grid_width * scale_factor,
data->grid_height * scale_factor);
g_assert (pixbuf != NULL);
res = g_list_append (res, pixbuf);
}
}
out:
/* We don't need the original pixbuf anymore, which is owned by the loader,
* though the subpixbufs will hold a reference. */
g_object_unref (loader);
g_free (buffer);
g_clear_pointer (&error, g_error_free);
g_task_return_pointer (result, res, free_glist_unref_gobjects);
}
/**
* st_texture_cache_load_sliced_image:
* @cache: A #StTextureCache
* @file: A #GFile
* @grid_width: Width in pixels
* @grid_height: Height in pixels
* @paint_scale: Scale factor of the display
* @load_callback: (scope async) (nullable): Function called when the image is loaded, or %NULL
* @user_data: Data to pass to the load callback
*
* 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,
GFile *file,
gint grid_width,
gint grid_height,
gint paint_scale,
gfloat resource_scale,
GFunc load_callback,
gpointer user_data)
{
AsyncImageData *data;
GTask *result;
ClutterActor *actor = clutter_actor_new ();
GCancellable *cancellable = g_cancellable_new ();
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_assert (paint_scale > 0);
g_assert (resource_scale > 0);
data = g_slice_new0 (AsyncImageData);
data->grid_width = grid_width;
data->grid_height = grid_height;
data->paint_scale = paint_scale;
data->resource_scale = resource_scale;
data->gfile = g_object_ref (file);
data->actor = actor;
data->cancellable = cancellable;
data->load_callback = load_callback;
data->load_callback_data = user_data;
g_object_ref (G_OBJECT (actor));
result = g_task_new (cache, cancellable, on_sliced_image_loaded, data);
g_signal_connect (actor, "destroy",
G_CALLBACK (on_sliced_image_actor_destroyed), result);
g_task_set_task_data (result, data, on_data_destroy);
g_task_run_in_thread (result, load_sliced_image);
g_object_unref (result);
return actor;
}
/**
* st_texture_cache_load_file_async:
* @cache: The texture cache instance
* @file: a #GFile 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
* @paint_scale: scale factor of the display
* @resource_scale: Resource scale factor
*
* 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_file_async (StTextureCache *cache,
GFile *file,
int available_width,
int available_height,
int paint_scale,
gfloat resource_scale)
{
ClutterActor *actor;
AsyncTextureLoadData *request;
StTextureCachePolicy policy;
gchar *key;
int scale;
scale = ceilf (paint_scale * resource_scale);
key = g_strdup_printf (CACHE_PREFIX_FILE "%u%d", g_file_hash (file), scale);
policy = ST_TEXTURE_CACHE_POLICY_NONE; /* XXX */
actor = create_invisible_actor ();
if (ensure_request (cache, key, policy, &request, actor))
{
/* 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->file = g_object_ref (file);
request->policy = policy;
request->width = available_width;
request->height = available_height;
request->paint_scale = paint_scale;
request->resource_scale = resource_scale;
load_texture_async (cache, request);
}
ensure_monitor_for_file (cache, file);
return actor;
}
static CoglTexture *
st_texture_cache_load_file_sync_to_cogl_texture (StTextureCache *cache,
StTextureCachePolicy policy,
GFile *file,
int available_width,
int available_height,
int paint_scale,
gfloat resource_scale,
GError **error)
{
ClutterContent *image;
CoglTexture *texdata;
GdkPixbuf *pixbuf;
char *key;
key = g_strdup_printf (CACHE_PREFIX_FILE "%u%f", g_file_hash (file), resource_scale);
texdata = NULL;
image = g_hash_table_lookup (cache->priv->keyed_cache, key);
if (image == NULL)
{
pixbuf = impl_load_pixbuf_file (file, available_width, available_height,
paint_scale, resource_scale, error);
if (!pixbuf)
goto out;
image = pixbuf_to_st_content_image (pixbuf,
available_height, available_width,
paint_scale, resource_scale);
g_object_unref (pixbuf);
if (!image)
goto out;
if (policy == ST_TEXTURE_CACHE_POLICY_FOREVER)
g_hash_table_insert (cache->priv->keyed_cache, g_strdup (key), image);
}
/* Because the texture is loaded synchronously, we won't call
* clutter_image_set_data(), so it's safe to use the texture
* of ClutterImage here. */
texdata = clutter_image_get_texture (CLUTTER_IMAGE (image));
cogl_object_ref (texdata);
ensure_monitor_for_file (cache, file);
out:
g_free (key);
return texdata;
}
static cairo_surface_t *
st_texture_cache_load_file_sync_to_cairo_surface (StTextureCache *cache,
StTextureCachePolicy policy,
GFile *file,
int available_width,
int available_height,
int paint_scale,
gfloat resource_scale,
GError **error)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
char *key;
key = g_strdup_printf (CACHE_PREFIX_FILE_FOR_CAIRO "%u%f", g_file_hash (file), resource_scale);
surface = g_hash_table_lookup (cache->priv->keyed_surface_cache, key);
if (surface == NULL)
{
pixbuf = impl_load_pixbuf_file (file, available_width, available_height,
paint_scale, resource_scale, 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_surface_cache,
g_strdup (key), surface);
}
}
else
cairo_surface_reference (surface);
ensure_monitor_for_file (cache, file);
out:
g_free (key);
return surface;
}
/**
* st_texture_cache_load_file_to_cogl_texture: (skip)
* @cache: A #StTextureCache
* @file: A #GFile in supported image format
* @paint_scale: Scale factor of the display
* @resource_scale: Resource scale factor
*
* This function synchronously loads the given file path
* into a COGL texture. On error, a warning is emitted
* and %NULL is returned.
*
* Returns: (transfer full): a new #CoglTexture
*/
CoglTexture *
st_texture_cache_load_file_to_cogl_texture (StTextureCache *cache,
GFile *file,
gint paint_scale,
gfloat resource_scale)
{
CoglTexture *texture;
GError *error = NULL;
texture = st_texture_cache_load_file_sync_to_cogl_texture (cache, ST_TEXTURE_CACHE_POLICY_FOREVER,
file, -1, -1, paint_scale, resource_scale,
&error);
if (texture == NULL)
{
char *uri = g_file_get_uri (file);
g_warning ("Failed to load %s: %s", uri, error->message);
g_clear_error (&error);
g_free (uri);
}
return texture;
}
/**
* st_texture_cache_load_file_to_cairo_surface:
* @cache: A #StTextureCache
* @file: A #GFile in supported image format
* @paint_scale: Scale factor of the display
* @resource_scale: Resource scale factor
*
* 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,
GFile *file,
gint paint_scale,
gfloat resource_scale)
{
cairo_surface_t *surface;
GError *error = NULL;
surface = st_texture_cache_load_file_sync_to_cairo_surface (cache, ST_TEXTURE_CACHE_POLICY_FOREVER,
file, -1, -1, paint_scale, resource_scale,
&error);
if (surface == NULL)
{
char *uri = g_file_get_uri (file);
g_warning ("Failed to load %s: %s", uri, error->message);
g_clear_error (&error);
g_free (uri);
}
return surface;
}
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;
}
gboolean
st_texture_cache_rescan_icon_theme (StTextureCache *cache)
{
StTextureCachePrivate *priv = cache->priv;
return gtk_icon_theme_rescan_if_needed (priv->icon_theme);
}
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