transmission/gtk/icons.cc

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/*
* icons.[ch] written by Paolo Bacchilega, who writes:
* "There is no problem for me, you can license my code
* under whatever licence you wish :)"
*
*/
#include <glib.h>
#include <gtk/gtk.h>
#include <gio/gio.h>
#include "icons.h"
#define VOID_PIXBUF_KEY "void-pixbuf"
static char const* get_static_string(char const* s)
{
static GStringChunk* static_strings = nullptr;
if (s == nullptr)
{
return nullptr;
}
if (static_strings == nullptr)
{
static_strings = g_string_chunk_new(1024);
}
return g_string_chunk_insert_const(static_strings, s);
}
typedef struct
{
GtkIconTheme* icon_theme;
int icon_size;
GHashTable* cache;
} IconCache;
static IconCache* icon_cache[7] = { nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr };
static GdkPixbuf* create_void_pixbuf(int width, int height)
{
GdkPixbuf* p;
p = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, width, height);
gdk_pixbuf_fill(p, 0xFFFFFF00);
return p;
}
static int get_size_in_pixels(GtkIconSize icon_size)
{
int width = 0;
int height = 0;
gtk_icon_size_lookup(icon_size, &width, &height);
return MAX(width, height);
}
static IconCache* icon_cache_new(GtkWidget* for_widget, GtkIconSize icon_size)
{
g_return_val_if_fail(for_widget != nullptr, nullptr);
IconCache* icons = g_new0(IconCache, 1);
icons->icon_theme = gtk_icon_theme_get_for_screen(gtk_widget_get_screen(for_widget));
icons->icon_size = get_size_in_pixels(icon_size);
icons->cache = g_hash_table_new_full(g_str_hash, g_str_equal, nullptr, g_object_unref);
g_hash_table_insert(icons->cache, (void*)VOID_PIXBUF_KEY, create_void_pixbuf(icons->icon_size, icons->icon_size));
return icons;
}
static char const* _icon_cache_get_icon_key(GIcon* icon)
{
char const* key = nullptr;
if (G_IS_THEMED_ICON(icon))
{
char** icon_names;
char* name;
g_object_get(icon, "names", &icon_names, nullptr);
name = g_strjoinv(",", icon_names);
key = get_static_string(name);
g_free(name);
g_strfreev(icon_names);
}
else if (G_IS_FILE_ICON(icon))
{
GFile* file;
char* filename;
file = g_file_icon_get_file(G_FILE_ICON(icon));
filename = g_file_get_path(file);
key = get_static_string(filename);
g_free(filename);
g_object_unref(file);
}
return key;
}
static GdkPixbuf* get_themed_icon_pixbuf(GThemedIcon* icon, int size, GtkIconTheme* icon_theme)
{
char** icon_names = nullptr;
GtkIconInfo* icon_info;
GdkPixbuf* pixbuf;
GError* error = nullptr;
g_object_get(icon, "names", &icon_names, nullptr);
icon_info = gtk_icon_theme_choose_icon(icon_theme, (char const**)icon_names, size, {});
if (icon_info == nullptr)
{
icon_info = gtk_icon_theme_lookup_icon(icon_theme, "text-x-generic", size, GTK_ICON_LOOKUP_USE_BUILTIN);
}
pixbuf = gtk_icon_info_load_icon(icon_info, &error);
if (pixbuf == nullptr)
{
if (error != nullptr && error->message != nullptr)
{
g_warning("could not load icon pixbuf: %s\n", error->message);
}
g_clear_error(&error);
}
#if GTK_CHECK_VERSION(3, 8, 0)
g_object_unref(icon_info);
#else
gtk_icon_info_free(icon_info);
#endif
g_strfreev(icon_names);
return pixbuf;
}
static GdkPixbuf* get_file_icon_pixbuf(GFileIcon* icon, int size)
{
GFile* file;
char* filename;
GdkPixbuf* pixbuf;
file = g_file_icon_get_file(icon);
filename = g_file_get_path(file);
pixbuf = gdk_pixbuf_new_from_file_at_size(filename, size, -1, nullptr);
g_free(filename);
g_object_unref(file);
return pixbuf;
}
static GdkPixbuf* _get_icon_pixbuf(GIcon* icon, int size, GtkIconTheme* theme)
{
if (icon == nullptr)
{
return nullptr;
}
if (G_IS_THEMED_ICON(icon))
{
return get_themed_icon_pixbuf(G_THEMED_ICON(icon), size, theme);
}
if (G_IS_FILE_ICON(icon))
{
return get_file_icon_pixbuf(G_FILE_ICON(icon), size);
}
return nullptr;
}
static GdkPixbuf* icon_cache_get_mime_type_icon(IconCache* icons, char const* mime_type)
{
GIcon* icon = g_content_type_get_icon(mime_type);
char const* key = _icon_cache_get_icon_key(icon);
if (key == nullptr)
{
key = VOID_PIXBUF_KEY;
}
g_return_val_if_fail(icons != nullptr, nullptr);
auto* pixbuf = static_cast<GdkPixbuf*>(g_hash_table_lookup(icons->cache, key));
if (pixbuf != nullptr)
{
g_object_ref(pixbuf);
g_object_unref(G_OBJECT(icon));
return pixbuf;
}
2009-07-27 18:48:21 +00:00
pixbuf = _get_icon_pixbuf(icon, icons->icon_size, icons->icon_theme);
if (pixbuf != nullptr)
{
g_hash_table_insert(icons->cache, (gpointer)key, g_object_ref(pixbuf));
}
g_object_unref(G_OBJECT(icon));
return pixbuf;
}
GdkPixbuf* gtr_get_mime_type_icon(char const* mime_type, GtkIconSize icon_size, GtkWidget* for_widget)
{
int n;
switch (icon_size)
{
case GTK_ICON_SIZE_MENU:
n = 1;
break;
case GTK_ICON_SIZE_SMALL_TOOLBAR:
n = 2;
break;
case GTK_ICON_SIZE_LARGE_TOOLBAR:
n = 3;
break;
case GTK_ICON_SIZE_BUTTON:
n = 4;
break;
case GTK_ICON_SIZE_DND:
n = 5;
break;
case GTK_ICON_SIZE_DIALOG:
n = 6;
break;
default: /*GTK_ICON_SIZE_INVALID*/
n = 0;
break;
}
if (icon_cache[n] == nullptr)
{
icon_cache[n] = icon_cache_new(for_widget, icon_size);
}
return icon_cache_get_mime_type_icon(icon_cache[n], mime_type);
}
char const* gtr_get_mime_type_from_filename(char const* file)
{
char* tmp = g_content_type_guess(file, nullptr, 0, nullptr);
char const* ret = get_static_string(tmp);
g_free(tmp);
return ret;
}