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gtk2/gtk/gtkimage.c
Matthias Clasen eaf09a4625 Cosmetics 
Pango lets us pass NULL for the font desc and language
in pango_context_get_font_metrics() to use the context
values.
2021-03-18 07:52:03 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkimageprivate.h"
#include "gtkiconhelperprivate.h"
#include "gtkicontheme.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtkscalerprivate.h"
#include "gtksnapshot.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include <math.h>
#include <string.h>
#include <cairo-gobject.h>
/**
* GtkImage:
*
* The `GtkImage` widget displays an image.
*
* ![An example GtkImage](image.png)
*
* Various kinds of object can be displayed as an image; most typically,
* you would load a `GdkTexture` from a file, using the convenience function
* [ctor@Gtk.Image.new_from_file], for instance:
*
* ```c
* GtkWidget *image = gtk_image_new_from_file ("myfile.png");
* ```
*
* If the file isn’t loaded successfully, the image will contain a
* “broken image” icon similar to that used in many web browsers.
*
* If you want to handle errors in loading the file yourself,
* for example by displaying an error message, then load the image with
* [ctor@Gdk.Texture.new_from_file], then create the `GtkImage` with
* [ctor@Gtk.Image.new_from_paintable].
*
* Sometimes an application will want to avoid depending on external data
* files, such as image files. See the documentation of `GResource` inside
* GIO, for details. In this case, [property@Gtk.Image:resource],
* [ctor@Gtk.Image.new_from_resource], and [method@Gtk.Image.set_from_resource]
* should be used.
*
* `GtkImage` displays its image as an icon, with a size that is determined
* by the application. See [class@Gtk.Picture] if you want to show an image
* at is actual size.
*
* ## CSS nodes
*
* `GtkImage` has a single CSS node with the name `image`. The style classes
* `.normal-icons` or `.large-icons` may appear, depending on the
* [property@Gtk.Image:icon-size] property.
*
* ## Accessibility
*
* `GtkImage` uses the `GTK_ACCESSIBLE_ROLE_IMG` role.
*/
typedef struct _GtkImageClass GtkImageClass;
struct _GtkImage
{
GtkWidget parent_instance;
GtkIconHelper *icon_helper;
GtkIconSize icon_size;
float baseline_align;
char *filename;
char *resource_path;
};
struct _GtkImageClass
{
GtkWidgetClass parent_class;
};
static void gtk_image_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot);
static void gtk_image_unrealize (GtkWidget *widget);
static void gtk_image_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
static void gtk_image_css_changed (GtkWidget *widget,
GtkCssStyleChange *change);
static void gtk_image_system_setting_changed (GtkWidget *widget,
GtkSystemSetting setting);
static void gtk_image_finalize (GObject *object);
static void gtk_image_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_image_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
enum
{
PROP_0,
PROP_PAINTABLE,
PROP_FILE,
PROP_ICON_SIZE,
PROP_PIXEL_SIZE,
PROP_ICON_NAME,
PROP_STORAGE_TYPE,
PROP_GICON,
PROP_RESOURCE,
PROP_USE_FALLBACK,
NUM_PROPERTIES
};
static GParamSpec *image_props[NUM_PROPERTIES] = { NULL, };
G_DEFINE_TYPE (GtkImage, gtk_image, GTK_TYPE_WIDGET)
static void
gtk_image_class_init (GtkImageClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = G_OBJECT_CLASS (class);
gobject_class->set_property = gtk_image_set_property;
gobject_class->get_property = gtk_image_get_property;
gobject_class->finalize = gtk_image_finalize;
widget_class = GTK_WIDGET_CLASS (class);
widget_class->snapshot = gtk_image_snapshot;
widget_class->measure = gtk_image_measure;
widget_class->unrealize = gtk_image_unrealize;
widget_class->css_changed = gtk_image_css_changed;
widget_class->system_setting_changed = gtk_image_system_setting_changed;
/**
* GtkImage:paintable: (attributes org.gtk.Property.get=gtk_image_get_paintable org.gtk.Property.set=gtk_image_set_from_paintable)
*
* The `GdkPaintable` to display.
*/
image_props[PROP_PAINTABLE] =
g_param_spec_object ("paintable",
P_("Paintable"),
P_("A GdkPaintable to display"),
GDK_TYPE_PAINTABLE,
GTK_PARAM_READWRITE);
/**
* GtkImage:file: (attributes org.gtk.Property.set=gtk_image_set_from_file)
*
* The `GFile to display.
*/
image_props[PROP_FILE] =
g_param_spec_string ("file",
P_("Filename"),
P_("Filename to load and display"),
NULL,
GTK_PARAM_READWRITE);
/**
* GtkImage:icon-size: (attributes org.gtk.Property.get=gtk_image_get_icon_size org.gtk.Property.set=gtk_image_set_icon_size org.gtk.Property.set=gtk_image_set_icon_size)
*
* The symbolic size to display icons at.
*/
image_props[PROP_ICON_SIZE] =
g_param_spec_enum ("icon-size",
P_("Icon size"),
P_("Symbolic size to use for icon set or named icon"),
GTK_TYPE_ICON_SIZE,
GTK_ICON_SIZE_INHERIT,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkImage:pixel-size: (attributes org.gtk.Property.get=gtk_image_get_pixel_size org.gtk.Property.set=gtk_image_set_pixel_size)
*
* The size in pixels to display icons at.
*
* If set to a value != -1, this property overrides the
* [property@Gtk.Image:icon-size] property for images of type
* `GTK_IMAGE_ICON_NAME`.
*/
image_props[PROP_PIXEL_SIZE] =
g_param_spec_int ("pixel-size",
P_("Pixel size"),
P_("Pixel size to use for named icon"),
-1, G_MAXINT,
-1,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkImage:icon-name: (attributes org.gtk.Property.get=gtk_image_get_icon_name org.gtk.Property.set=gtk_image_set_from_icon_name)
*
* The name of the icon in the icon theme.
*
* If the icon theme is changed, the image will be updated automatically.
*/
image_props[PROP_ICON_NAME] =
g_param_spec_string ("icon-name",
P_("Icon Name"),
P_("The name of the icon from the icon theme"),
NULL,
GTK_PARAM_READWRITE);
/**
* GtkImage:gicon: (attributes org.gtk.Property.get=gtk_image_get_gicon org.gtk.Property.set=gtk_image_set_from_gicon)
*
* The `GIcon` displayed in the GtkImage.
*
* For themed icons, If the icon theme is changed, the image will be updated
* automatically.
*/
image_props[PROP_GICON] =
g_param_spec_object ("gicon",
P_("Icon"),
P_("The GIcon being displayed"),
G_TYPE_ICON,
GTK_PARAM_READWRITE);
/**
* GtkImage:resource: (attributes org.gtk.Property.set=gtk_image_set_from_resource)
*
* A path to a resource file to display.
*/
image_props[PROP_RESOURCE] =
g_param_spec_string ("resource",
P_("Resource"),
P_("The resource path being displayed"),
NULL,
GTK_PARAM_READWRITE);
/**
* GtkImage:storage-type: (attributes org.gtk.Property.get=gtk_image_get_storage_type)
*
* The representation being used for image data.
*/
image_props[PROP_STORAGE_TYPE] =
g_param_spec_enum ("storage-type",
P_("Storage type"),
P_("The representation being used for image data"),
GTK_TYPE_IMAGE_TYPE,
GTK_IMAGE_EMPTY,
GTK_PARAM_READABLE);
/**
* GtkImage:use-fallback:
*
* Whether the icon displayed in the `GtkImage` will use
* standard icon names fallback.
*
* The value of this property is only relevant for images of type
* %GTK_IMAGE_ICON_NAME and %GTK_IMAGE_GICON.
*/
image_props[PROP_USE_FALLBACK] =
g_param_spec_boolean ("use-fallback",
P_("Use Fallback"),
P_("Whether to use icon names fallback"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, NUM_PROPERTIES, image_props);
gtk_widget_class_set_css_name (widget_class, I_("image"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_IMG);
}
static void
gtk_image_init (GtkImage *image)
{
GtkCssNode *widget_node;
widget_node = gtk_widget_get_css_node (GTK_WIDGET (image));
image->icon_helper = gtk_icon_helper_new (widget_node, GTK_WIDGET (image));
}
static void
gtk_image_finalize (GObject *object)
{
GtkImage *image = GTK_IMAGE (object);
gtk_image_clear (image);
g_clear_object (&image->icon_helper);
g_free (image->filename);
g_free (image->resource_path);
G_OBJECT_CLASS (gtk_image_parent_class)->finalize (object);
};
static void
gtk_image_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkImage *image = GTK_IMAGE (object);
switch (prop_id)
{
case PROP_PAINTABLE:
gtk_image_set_from_paintable (image, g_value_get_object (value));
break;
case PROP_FILE:
gtk_image_set_from_file (image, g_value_get_string (value));
break;
case PROP_ICON_SIZE:
gtk_image_set_icon_size (image, g_value_get_enum (value));
break;
case PROP_PIXEL_SIZE:
gtk_image_set_pixel_size (image, g_value_get_int (value));
break;
case PROP_ICON_NAME:
gtk_image_set_from_icon_name (image, g_value_get_string (value));
break;
case PROP_GICON:
gtk_image_set_from_gicon (image, g_value_get_object (value));
break;
case PROP_RESOURCE:
gtk_image_set_from_resource (image, g_value_get_string (value));
break;
case PROP_USE_FALLBACK:
if (_gtk_icon_helper_set_use_fallback (image->icon_helper, g_value_get_boolean (value)))
g_object_notify_by_pspec (object, pspec);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_image_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkImage *image = GTK_IMAGE (object);
switch (prop_id)
{
case PROP_PAINTABLE:
g_value_set_object (value, _gtk_icon_helper_peek_paintable (image->icon_helper));
break;
case PROP_FILE:
g_value_set_string (value, image->filename);
break;
case PROP_ICON_SIZE:
g_value_set_enum (value, image->icon_size);
break;
case PROP_PIXEL_SIZE:
g_value_set_int (value, _gtk_icon_helper_get_pixel_size (image->icon_helper));
break;
case PROP_ICON_NAME:
g_value_set_string (value, _gtk_icon_helper_get_icon_name (image->icon_helper));
break;
case PROP_GICON:
g_value_set_object (value, _gtk_icon_helper_peek_gicon (image->icon_helper));
break;
case PROP_RESOURCE:
g_value_set_string (value, image->resource_path);
break;
case PROP_USE_FALLBACK:
g_value_set_boolean (value, _gtk_icon_helper_get_use_fallback (image->icon_helper));
break;
case PROP_STORAGE_TYPE:
g_value_set_enum (value, _gtk_icon_helper_get_storage_type (image->icon_helper));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gtk_image_new_from_file:
* @filename: (type filename): a filename
*
* Creates a new `GtkImage` displaying the file @filename.
*
* If the file isn’t found or can’t be loaded, the resulting `GtkImage`
* will display a “broken image” icon. This function never returns %NULL,
* it always returns a valid `GtkImage` widget.
*
* If you need to detect failures to load the file, use
* [ctor@Gdk.Texture.new_from_file] to load the file yourself,
* then create the `GtkImage` from the texture.
*
* The storage type (see [method@Gtk.Image.get_storage_type])
* of the returned image is not defined, it will be whatever
* is appropriate for displaying the file.
*
* Returns: a new `GtkImage`
*/
GtkWidget*
gtk_image_new_from_file (const char *filename)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_file (image, filename);
return GTK_WIDGET (image);
}
/**
* gtk_image_new_from_resource:
* @resource_path: a resource path
*
* Creates a new `GtkImage` displaying the resource file @resource_path.
*
* If the file isn’t found or can’t be loaded, the resulting `GtkImage` will
* display a “broken image” icon. This function never returns %NULL,
* it always returns a valid `GtkImage` widget.
*
* If you need to detect failures to load the file, use
* [ctor@GdkPixbuf.Pixbuf.new_from_file] to load the file yourself,
* then create the `GtkImage` from the pixbuf.
*
* The storage type (see [method@Gtk.Image.get_storage_type]) of
* the returned image is not defined, it will be whatever is
* appropriate for displaying the file.
*
* Returns: a new `GtkImage`
*/
GtkWidget*
gtk_image_new_from_resource (const char *resource_path)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_resource (image, resource_path);
return GTK_WIDGET (image);
}
/**
* gtk_image_new_from_pixbuf:
* @pixbuf: (allow-none): a `GdkPixbuf`, or %NULL
*
* Creates a new `GtkImage` displaying @pixbuf.
*
* The `GtkImage` does not assume a reference to the pixbuf; you still
* need to unref it if you own references. `GtkImage` will add its own
* reference rather than adopting yours.
*
* This is a helper for [ctor@Gtk.Image.new_from_paintable], and you can't
* get back the exact pixbuf once this is called, only a texture.
*
* Note that this function just creates an `GtkImage` from the pixbuf.
* The `GtkImage` created will not react to state changes. Should you
* want that, you should use [ctor@Gtk.Image.new_from_icon_name].
*
* Returns: a new `GtkImage`
*/
GtkWidget*
gtk_image_new_from_pixbuf (GdkPixbuf *pixbuf)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_pixbuf (image, pixbuf);
return GTK_WIDGET (image);
}
/**
* gtk_image_new_from_paintable:
* @paintable: (allow-none): a `GdkPaintable`, or %NULL
*
* Creates a new `GtkImage` displaying @paintable.
*
* The `GtkImage` does not assume a reference to the paintable; you still
* need to unref it if you own references. `GtkImage` will add its own
* reference rather than adopting yours.
*
* The `GtkImage` will track changes to the @paintable and update
* its size and contents in response to it.
*
* Returns: a new `GtkImage`
*/
GtkWidget*
gtk_image_new_from_paintable (GdkPaintable *paintable)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_paintable (image, paintable);
return GTK_WIDGET (image);
}
/**
* gtk_image_new_from_icon_name:
* @icon_name: (nullable): an icon name or %NULL
*
* Creates a `GtkImage` displaying an icon from the current icon theme.
*
* If the icon name isn’t known, a “broken image” icon will be
* displayed instead. If the current icon theme is changed, the icon
* will be updated appropriately.
*
* Returns: a new `GtkImage` displaying the themed icon
*/
GtkWidget*
gtk_image_new_from_icon_name (const char *icon_name)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_icon_name (image, icon_name);
return GTK_WIDGET (image);
}
/**
* gtk_image_new_from_gicon:
* @icon: an icon
*
* Creates a `GtkImage` displaying an icon from the current icon theme.
*
* If the icon name isn’t known, a “broken image” icon will be
* displayed instead. If the current icon theme is changed, the icon
* will be updated appropriately.
*
* Returns: a new `GtkImage` displaying the themed icon
*/
GtkWidget*
gtk_image_new_from_gicon (GIcon *icon)
{
GtkImage *image;
image = g_object_new (GTK_TYPE_IMAGE, NULL);
gtk_image_set_from_gicon (image, icon);
return GTK_WIDGET (image);
}
typedef struct {
GtkImage *image;
int scale_factor;
} LoaderData;
static void
on_loader_size_prepared (GdkPixbufLoader *loader,
int width,
int height,
gpointer user_data)
{
LoaderData *loader_data = user_data;
int scale_factor;
GdkPixbufFormat *format;
/* Let the regular icon helper code path handle non-scalable images */
format = gdk_pixbuf_loader_get_format (loader);
if (!gdk_pixbuf_format_is_scalable (format))
{
loader_data->scale_factor = 1;
return;
}
scale_factor = gtk_widget_get_scale_factor (GTK_WIDGET (loader_data->image));
gdk_pixbuf_loader_set_size (loader, width * scale_factor, height * scale_factor);
loader_data->scale_factor = scale_factor;
}
static GdkPixbufAnimation *
load_scalable_with_loader (GtkImage *image,
const char *file_path,
const char *resource_path,
int *scale_factor_out)
{
GdkPixbufLoader *loader;
GBytes *bytes;
char *contents;
gsize length;
gboolean res;
GdkPixbufAnimation *animation;
LoaderData loader_data;
animation = NULL;
bytes = NULL;
loader = gdk_pixbuf_loader_new ();
loader_data.image = image;
g_signal_connect (loader, "size-prepared", G_CALLBACK (on_loader_size_prepared), &loader_data);
if (resource_path != NULL)
{
bytes = g_resources_lookup_data (resource_path, G_RESOURCE_LOOKUP_FLAGS_NONE, NULL);
}
else if (file_path != NULL)
{
res = g_file_get_contents (file_path, &contents, &length, NULL);
if (res)
bytes = g_bytes_new_take (contents, length);
}
else
{
g_assert_not_reached ();
}
if (!bytes)
goto out;
if (!gdk_pixbuf_loader_write_bytes (loader, bytes, NULL))
goto out;
if (!gdk_pixbuf_loader_close (loader, NULL))
goto out;
animation = gdk_pixbuf_loader_get_animation (loader);
if (animation != NULL)
{
g_object_ref (animation);
if (scale_factor_out != NULL)
*scale_factor_out = loader_data.scale_factor;
}
out:
gdk_pixbuf_loader_close (loader, NULL);
g_object_unref (loader);
g_bytes_unref (bytes);
return animation;
}
/**
* gtk_image_set_from_file: (attributes org.gtk.Method.set_property=file)
* @image: a `GtkImage`
* @filename: (type filename) (allow-none): a filename or %NULL
*
* Sets a `GtkImage` to show a file.
*
* See [ctor@Gtk.Image.new_from_file] for details.
*/
void
gtk_image_set_from_file (GtkImage *image,
const char *filename)
{
GdkPixbufAnimation *anim;
int scale_factor;
GdkTexture *texture;
GdkPaintable *scaler;
g_return_if_fail (GTK_IS_IMAGE (image));
g_object_freeze_notify (G_OBJECT (image));
gtk_image_clear (image);
if (filename == NULL)
{
image->filename = NULL;
g_object_thaw_notify (G_OBJECT (image));
return;
}
anim = load_scalable_with_loader (image, filename, NULL, &scale_factor);
if (anim == NULL)
{
gtk_image_set_from_icon_name (image, "image-missing");
g_object_thaw_notify (G_OBJECT (image));
return;
}
texture = gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (anim));
scaler = gtk_scaler_new (GDK_PAINTABLE (texture), scale_factor);
gtk_image_set_from_paintable (image, scaler);
g_object_unref (scaler);
g_object_unref (texture);
g_object_unref (anim);
image->filename = g_strdup (filename);
g_object_thaw_notify (G_OBJECT (image));
}
#ifndef GDK_PIXBUF_MAGIC_NUMBER
#define GDK_PIXBUF_MAGIC_NUMBER (0x47646b50) /* 'GdkP' */
#endif
static gboolean
resource_is_pixdata (const char *resource_path)
{
const guint8 *stream;
guint32 magic;
gsize data_size;
GBytes *bytes;
gboolean ret = FALSE;
bytes = g_resources_lookup_data (resource_path, 0, NULL);
if (bytes == NULL)
return FALSE;
stream = g_bytes_get_data (bytes, &data_size);
if (data_size < sizeof(guint32))
goto out;
magic = (stream[0] << 24) + (stream[1] << 16) + (stream[2] << 8) + stream[3];
if (magic == GDK_PIXBUF_MAGIC_NUMBER)
ret = TRUE;
out:
g_bytes_unref (bytes);
return ret;
}
/**
* gtk_image_set_from_resource: (attributes org.gtk.Method.set_property=resource)
* @image: a `GtkImage`
* @resource_path: (allow-none): a resource path or %NULL
*
* Sets a `GtkImage` to show a resource.
*
* See [ctor@Gtk.Image.new_from_resource] for details.
*/
void
gtk_image_set_from_resource (GtkImage *image,
const char *resource_path)
{
GdkPixbufAnimation *animation;
int scale_factor = 1;
GdkTexture *texture;
GdkPaintable *scaler;
g_return_if_fail (GTK_IS_IMAGE (image));
g_object_freeze_notify (G_OBJECT (image));
gtk_image_clear (image);
if (resource_path == NULL)
{
g_object_thaw_notify (G_OBJECT (image));
return;
}
if (resource_is_pixdata (resource_path))
{
g_warning ("GdkPixdata format images are not supported, remove the \"to-pixdata\" option from your GResource files");
animation = NULL;
}
else
{
animation = load_scalable_with_loader (image, NULL, resource_path, &scale_factor);
}
if (animation == NULL)
{
gtk_image_set_from_icon_name (image, "image-missing");
g_object_thaw_notify (G_OBJECT (image));
return;
}
texture = gdk_texture_new_for_pixbuf (gdk_pixbuf_animation_get_static_image (animation));
scaler = gtk_scaler_new (GDK_PAINTABLE (texture), scale_factor);
gtk_image_set_from_paintable (image, scaler);
g_object_unref (scaler);
g_object_unref (texture);
image->resource_path = g_strdup (resource_path);
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_RESOURCE]);
g_object_unref (animation);
g_object_thaw_notify (G_OBJECT (image));
}
/**
* gtk_image_set_from_pixbuf: (attributes org.gtk.Method.set_property=paintable)
* @image: a `GtkImage`
* @pixbuf: (allow-none): a `GdkPixbuf` or `NULL`
*
* Sets a `GtkImage` to show a `GdkPixbuf`.
*
* See [ctor@Gtk.Image.new_from_pixbuf] for details.
*
* Note: This is a helper for [method@Gtk.Image.set_from_paintable],
* and you can't get back the exact pixbuf once this is called,
* only a paintable.
*/
void
gtk_image_set_from_pixbuf (GtkImage *image,
GdkPixbuf *pixbuf)
{
GdkTexture *texture;
g_return_if_fail (GTK_IS_IMAGE (image));
g_return_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf));
if (pixbuf)
texture = gdk_texture_new_for_pixbuf (pixbuf);
else
texture = NULL;
gtk_image_set_from_paintable (image, GDK_PAINTABLE (texture));
if (texture)
g_object_unref (texture);
}
/**
* gtk_image_set_from_icon_name: (attributes org.gtk.Method.set_property=icon-name)
* @image: a `GtkImage`
* @icon_name: (nullable): an icon name or %NULL
*
* Sets a `GtkImage` to show a named icon.
*
* See [ctor@Gtk.Image.new_from_icon_name] for details.
*/
void
gtk_image_set_from_icon_name (GtkImage *image,
const char *icon_name)
{
g_return_if_fail (GTK_IS_IMAGE (image));
g_object_freeze_notify (G_OBJECT (image));
gtk_image_clear (image);
if (icon_name)
_gtk_icon_helper_set_icon_name (image->icon_helper, icon_name);
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_ICON_NAME]);
g_object_thaw_notify (G_OBJECT (image));
}
/**
* gtk_image_set_from_gicon: (attributes org.gtk.Method.set_property=gicon)
* @image: a `GtkImage`
* @icon: an icon
*
* Sets a `GtkImage` to show a `GIcon`.
*
* See [ctor@Gtk.Image.new_from_gicon] for details.
*/
void
gtk_image_set_from_gicon (GtkImage *image,
GIcon *icon)
{
g_return_if_fail (GTK_IS_IMAGE (image));
g_object_freeze_notify (G_OBJECT (image));
if (icon)
g_object_ref (icon);
gtk_image_clear (image);
if (icon)
{
_gtk_icon_helper_set_gicon (image->icon_helper, icon);
g_object_unref (icon);
}
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_GICON]);
g_object_thaw_notify (G_OBJECT (image));
}
static void
gtk_image_paintable_invalidate_contents (GdkPaintable *paintable,
GtkImage *image)
{
gtk_widget_queue_draw (GTK_WIDGET (image));
}
static void
gtk_image_paintable_invalidate_size (GdkPaintable *paintable,
GtkImage *image)
{
gtk_icon_helper_invalidate (image->icon_helper);
}
/**
* gtk_image_set_from_paintable: (attributes org.gtk.Method.set_property=paintable)
* @image: a `GtkImage`
* @paintable: (nullable): a `GdkPaintable` or %NULL
*
* Sets a `GtkImage` to show a `GdkPaintable`.
*
* See [ctor@Gtk.Image.new_from_paintable] for details.
*/
void
gtk_image_set_from_paintable (GtkImage *image,
GdkPaintable *paintable)
{
g_return_if_fail (GTK_IS_IMAGE (image));
g_return_if_fail (paintable == NULL || GDK_IS_PAINTABLE (paintable));
g_object_freeze_notify (G_OBJECT (image));
if (paintable)
g_object_ref (paintable);
gtk_image_clear (image);
if (paintable)
{
const guint flags = gdk_paintable_get_flags (paintable);
_gtk_icon_helper_set_paintable (image->icon_helper, paintable);
if ((flags & GDK_PAINTABLE_STATIC_CONTENTS) == 0)
g_signal_connect (paintable,
"invalidate-contents",
G_CALLBACK (gtk_image_paintable_invalidate_contents),
image);
if ((flags & GDK_PAINTABLE_STATIC_SIZE) == 0)
g_signal_connect (paintable,
"invalidate-size",
G_CALLBACK (gtk_image_paintable_invalidate_size),
image);
g_object_unref (paintable);
}
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_PAINTABLE]);
g_object_thaw_notify (G_OBJECT (image));
}
/**
* gtk_image_get_storage_type: (attributes org.gtk.Method.get_property=storage-type)
* @image: a `GtkImage`
*
* Gets the type of representation being used by the `GtkImage`
* to store image data.
*
* If the `GtkImage` has no image data, the return value will
* be %GTK_IMAGE_EMPTY.
*
* Returns: image representation being used
*/
GtkImageType
gtk_image_get_storage_type (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), GTK_IMAGE_EMPTY);
return _gtk_icon_helper_get_storage_type (image->icon_helper);
}
/**
* gtk_image_get_paintable: (attributes org.gtk.Method.get_property=paintable)
* @image: a `GtkImage`
*
* Gets the image `GdkPaintable` being displayed by the `GtkImage`.
*
* The storage type of the image must be %GTK_IMAGE_EMPTY or
* %GTK_IMAGE_PAINTABLE (see [method@Gtk.Image.get_storage_type]).
* The caller of this function does not own a reference to the
* returned paintable.
*
* Returns: (nullable) (transfer none): the displayed paintable,
* or %NULL if the image is empty
*/
GdkPaintable *
gtk_image_get_paintable (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), NULL);
return _gtk_icon_helper_peek_paintable (image->icon_helper);
}
/**
* gtk_image_get_icon_name: (attributes org.gtk.Method.get_property=icon-name)
* @image: a `GtkImage`
*
* Gets the icon name and size being displayed by the `GtkImage`.
*
* The storage type of the image must be %GTK_IMAGE_EMPTY or
* %GTK_IMAGE_ICON_NAME (see [method@Gtk.Image.get_storage_type]).
* The returned string is owned by the `GtkImage` and should not
* be freed.
*
* Returns: (transfer none) (allow-none): the icon name, or %NULL
*/
const char *
gtk_image_get_icon_name (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), NULL);
return _gtk_icon_helper_get_icon_name (image->icon_helper);
}
/**
* gtk_image_get_gicon: (attributes org.gtk.Method.get_property=gicon)
* @image: a `GtkImage`
*
* Gets the `GIcon` being displayed by the `GtkImage`.
*
* The storage type of the image must be %GTK_IMAGE_EMPTY or
* %GTK_IMAGE_GICON (see [method@Gtk.Image.get_storage_type]).
* The caller of this function does not own a reference to the
* returned `GIcon`.
*
* Returns: (transfer none) (allow-none): a `GIcon`, or %NULL
**/
GIcon *
gtk_image_get_gicon (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), NULL);
return _gtk_icon_helper_peek_gicon (image->icon_helper);
}
/**
* gtk_image_new:
*
* Creates a new empty `GtkImage` widget.
*
* Returns: a newly created `GtkImage` widget.
*/
GtkWidget*
gtk_image_new (void)
{
return g_object_new (GTK_TYPE_IMAGE, NULL);
}
static void
gtk_image_unrealize (GtkWidget *widget)
{
GtkImage *image = GTK_IMAGE (widget);
gtk_icon_helper_invalidate (image->icon_helper);
GTK_WIDGET_CLASS (gtk_image_parent_class)->unrealize (widget);
}
static float
gtk_image_get_baseline_align (GtkImage *image)
{
PangoContext *pango_context;
PangoFontMetrics *metrics;
if (image->baseline_align == 0.0)
{
pango_context = gtk_widget_get_pango_context (GTK_WIDGET (image));
metrics = pango_context_get_metrics (pango_context, NULL, NULL);
image->baseline_align =
(float)pango_font_metrics_get_ascent (metrics) /
(pango_font_metrics_get_ascent (metrics) + pango_font_metrics_get_descent (metrics));
pango_font_metrics_unref (metrics);
}
return image->baseline_align;
}
static void
gtk_image_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkImage *image = GTK_IMAGE (widget);
double ratio;
int x, y, width, height, baseline;
double w, h;
width = gtk_widget_get_width (widget);
height = gtk_widget_get_height (widget);
ratio = gdk_paintable_get_intrinsic_aspect_ratio (GDK_PAINTABLE (image->icon_helper));
if (ratio == 0)
{
gdk_paintable_snapshot (GDK_PAINTABLE (image->icon_helper), snapshot, width, height);
}
else
{
double image_ratio = (double) width / height;
if (ratio > image_ratio)
{
w = width;
h = width / ratio;
}
else
{
w = height * ratio;
h = height;
}
x = (width - ceil (w)) / 2;
baseline = gtk_widget_get_allocated_baseline (widget);
if (baseline == -1)
y = floor(height - ceil (h)) / 2;
else
y = CLAMP (baseline - h * gtk_image_get_baseline_align (image), 0, height - ceil (h));
if (x != 0 || y != 0)
{
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
gdk_paintable_snapshot (GDK_PAINTABLE (image->icon_helper), snapshot, w, h);
gtk_snapshot_restore (snapshot);
}
else
{
gdk_paintable_snapshot (GDK_PAINTABLE (image->icon_helper), snapshot, w, h);
}
}
}
static void
gtk_image_notify_for_storage_type (GtkImage *image,
GtkImageType storage_type)
{
switch (storage_type)
{
case GTK_IMAGE_ICON_NAME:
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_ICON_NAME]);
break;
case GTK_IMAGE_GICON:
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_GICON]);
break;
case GTK_IMAGE_PAINTABLE:
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_PAINTABLE]);
break;
case GTK_IMAGE_EMPTY:
default:
break;
}
}
void
gtk_image_set_from_definition (GtkImage *image,
GtkImageDefinition *def)
{
g_return_if_fail (GTK_IS_IMAGE (image));
g_object_freeze_notify (G_OBJECT (image));
gtk_image_clear (image);
if (def != NULL)
{
_gtk_icon_helper_set_definition (image->icon_helper, def);
gtk_image_notify_for_storage_type (image, gtk_image_definition_get_storage_type (def));
}
g_object_thaw_notify (G_OBJECT (image));
}
GtkImageDefinition *
gtk_image_get_definition (GtkImage *image)
{
return gtk_icon_helper_get_definition (image->icon_helper);
}
/**
* gtk_image_clear:
* @image: a `GtkImage`
*
* Resets the image to be empty.
*/
void
gtk_image_clear (GtkImage *image)
{
GtkImageType storage_type;
g_object_freeze_notify (G_OBJECT (image));
storage_type = gtk_image_get_storage_type (image);
if (storage_type != GTK_IMAGE_EMPTY)
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_STORAGE_TYPE]);
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_ICON_SIZE]);
gtk_image_notify_for_storage_type (image, storage_type);
if (image->filename)
{
g_free (image->filename);
image->filename = NULL;
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_FILE]);
}
if (image->resource_path)
{
g_free (image->resource_path);
image->resource_path = NULL;
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_RESOURCE]);
}
if (storage_type == GTK_IMAGE_PAINTABLE)
{
GdkPaintable *paintable = _gtk_icon_helper_peek_paintable (image->icon_helper);
const guint flags = gdk_paintable_get_flags (paintable);
if ((flags & GDK_PAINTABLE_STATIC_CONTENTS) == 0)
g_signal_handlers_disconnect_by_func (paintable,
gtk_image_paintable_invalidate_contents,
image);
if ((flags & GDK_PAINTABLE_STATIC_SIZE) == 0)
g_signal_handlers_disconnect_by_func (paintable,
gtk_image_paintable_invalidate_size,
image);
}
_gtk_icon_helper_clear (image->icon_helper);
g_object_thaw_notify (G_OBJECT (image));
}
static void
gtk_image_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkImage *image = GTK_IMAGE (widget);
float baseline_align;
*minimum = *natural = gtk_icon_helper_get_size (image->icon_helper);
if (orientation == GTK_ORIENTATION_VERTICAL)
{
baseline_align = gtk_image_get_baseline_align (GTK_IMAGE (widget));
if (minimum_baseline)
*minimum_baseline = *minimum * baseline_align;
if (natural_baseline)
*natural_baseline = *natural * baseline_align;
}
}
static void
gtk_image_css_changed (GtkWidget *widget,
GtkCssStyleChange *change)
{
GtkImage *image = GTK_IMAGE (widget);
gtk_icon_helper_invalidate_for_change (image->icon_helper, change);
GTK_WIDGET_CLASS (gtk_image_parent_class)->css_changed (widget, change);
image->baseline_align = 0.0;
}
static void
gtk_image_system_setting_changed (GtkWidget *widget,
GtkSystemSetting setting)
{
GtkImage *image = GTK_IMAGE (widget);
if (setting == GTK_SYSTEM_SETTING_ICON_THEME)
gtk_icon_helper_invalidate (image->icon_helper);
GTK_WIDGET_CLASS (gtk_image_parent_class)->system_setting_changed (widget, setting);
}
/**
* gtk_image_set_pixel_size: (attributes org.gtk.Method.set_property=pixel-size)
* @image: a `GtkImage`
* @pixel_size: the new pixel size
*
* Sets the pixel size to use for named icons.
*
* If the pixel size is set to a value != -1, it is used instead
* of the icon size set by [method@Gtk.Image.set_from_icon_name].
*/
void
gtk_image_set_pixel_size (GtkImage *image,
int pixel_size)
{
g_return_if_fail (GTK_IS_IMAGE (image));
if (_gtk_icon_helper_set_pixel_size (image->icon_helper, pixel_size))
{
if (gtk_widget_get_visible (GTK_WIDGET (image)))
gtk_widget_queue_resize (GTK_WIDGET (image));
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_PIXEL_SIZE]);
}
}
/**
* gtk_image_get_pixel_size: (attributes org.gtk.Method.get_property=pixel-size)
* @image: a `GtkImage`
*
* Gets the pixel size used for named icons.
*
* Returns: the pixel size used for named icons.
*/
int
gtk_image_get_pixel_size (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), -1);
return _gtk_icon_helper_get_pixel_size (image->icon_helper);
}
/**
* gtk_image_set_icon_size: (attributes org.gtk.Method.set_property=icon-size)
* @image: a `GtkImage`
* @icon_size: the new icon size
*
* Suggests an icon size to the theme for named icons.
*/
void
gtk_image_set_icon_size (GtkImage *image,
GtkIconSize icon_size)
{
g_return_if_fail (GTK_IS_IMAGE (image));
if (image->icon_size == icon_size)
return;
image->icon_size = icon_size;
gtk_icon_size_set_style_classes (gtk_widget_get_css_node (GTK_WIDGET (image)), icon_size);
g_object_notify_by_pspec (G_OBJECT (image), image_props[PROP_ICON_SIZE]);
}
/**
* gtk_image_get_icon_size: (attributes org.gtk.Method.get_property=icon-size)
* @image: a `GtkImage`
*
* Gets the icon size used by the @image when rendering icons.
*
* Returns: the image size used by icons
*/
GtkIconSize
gtk_image_get_icon_size (GtkImage *image)
{
g_return_val_if_fail (GTK_IS_IMAGE (image), GTK_ICON_SIZE_INHERIT);
return image->icon_size;
}
void
gtk_image_get_image_size (GtkImage *image,
int *width,
int *height)
{
*width = *height = gtk_icon_helper_get_size (image->icon_helper);
}
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