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Learning_GTK4_tree/gdk/gdkcontentdeserializer.c

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2023-12-12 11:36:42 +01:00
/* GTK - The GIMP Toolkit
* Copyright (C) 2017 Benjamin Otte
*
* 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/>.
*/
#include "config.h"
#include <gio/gio.h>
#include "gdkcontentdeserializer.h"
#include "gdkcontentformats.h"
#include "filetransferportalprivate.h"
#include "gdktexture.h"
#include "gdkrgbaprivate.h"
#include "gdkprivate.h"
#include "loaders/gdkpngprivate.h"
#include "loaders/gdktiffprivate.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
/**
* GdkContentDeserializer:
*
* A `GdkContentDeserializer` is used to deserialize content received via
* inter-application data transfers.
*
* The `GdkContentDeserializer` transforms serialized content that is
* identified by a mime type into an object identified by a GType.
*
* GTK provides serializers and deserializers for common data types
* such as text, colors, images or file lists. To register your own
* deserialization functions, use [func@content_register_deserializer].
*
* Also see [class@Gdk.ContentSerializer].
*/
typedef struct _Deserializer Deserializer;
struct _Deserializer
{
const char * mime_type; /* interned */
GType type;
GdkContentDeserializeFunc deserialize;
gpointer data;
GDestroyNotify notify;
};
GQueue deserializers = G_QUEUE_INIT;
static void init (void);
#define GDK_CONTENT_DESERIALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_CONTENT_DESERIALIZER, GdkContentDeserializerClass))
#define GDK_IS_CONTENT_DESERIALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_CONTENT_DESERIALIZER))
#define GDK_CONTENT_DESERIALIZER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_CONTENT_DESERIALIZER, GdkContentDeserializerClass))
typedef struct _GdkContentDeserializerClass GdkContentDeserializerClass;
struct _GdkContentDeserializer
{
GObject parent_instance;
const char *mime_type; /* interned */
GValue value;
GInputStream *stream;
int priority;
gboolean returned;
GCancellable *cancellable;
gpointer user_data;
GAsyncReadyCallback callback;
gpointer callback_data;
gpointer task_data;
GDestroyNotify task_notify;
GError *error;
};
struct _GdkContentDeserializerClass
{
GObjectClass parent_class;
};
static gpointer
gdk_content_deserializer_async_result_get_user_data (GAsyncResult *res)
{
return GDK_CONTENT_DESERIALIZER (res)->callback_data;
}
static GObject *
gdk_content_deserializer_async_result_get_source_object (GAsyncResult *res)
{
return NULL;
}
static void
gdk_content_deserializer_async_result_iface_init (GAsyncResultIface *iface)
{
iface->get_user_data = gdk_content_deserializer_async_result_get_user_data;
iface->get_source_object = gdk_content_deserializer_async_result_get_source_object;
}
G_DEFINE_TYPE_WITH_CODE (GdkContentDeserializer, gdk_content_deserializer, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_RESULT, gdk_content_deserializer_async_result_iface_init))
static void
gdk_content_deserializer_finalize (GObject *object)
{
GdkContentDeserializer *deserializer = GDK_CONTENT_DESERIALIZER (object);
g_value_unset (&deserializer->value);
g_clear_object (&deserializer->stream);
g_clear_object (&deserializer->cancellable);
g_clear_error (&deserializer->error);
if (deserializer->task_notify)
deserializer->task_notify (deserializer->task_data);
G_OBJECT_CLASS (gdk_content_deserializer_parent_class)->finalize (object);
}
static void
gdk_content_deserializer_class_init (GdkContentDeserializerClass *content_deserializer_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (content_deserializer_class);
object_class->finalize = gdk_content_deserializer_finalize;
}
static void
gdk_content_deserializer_init (GdkContentDeserializer *content_deserializer)
{
}
static void
gdk_content_deserializer_run (const char *mime_type,
GType type,
GInputStream *stream,
int priority,
GCancellable *cancellable,
GdkContentDeserializeFunc deserialize_func,
gpointer user_data,
GAsyncReadyCallback callback,
gpointer callback_data)
{
GdkContentDeserializer *deserializer;
deserializer = g_object_new (GDK_TYPE_CONTENT_DESERIALIZER, NULL);
deserializer->mime_type = mime_type;
g_value_init (&deserializer->value, type);
deserializer->stream = g_object_ref (stream);
deserializer->priority = priority;
if (cancellable)
deserializer->cancellable = g_object_ref (cancellable);
deserializer->user_data = user_data;
deserializer->callback = callback;
deserializer->callback_data = callback_data;
deserialize_func (deserializer);
}
/**
* gdk_content_deserializer_get_mime_type:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the mime type to deserialize from.
*
* Returns: (transfer none): the mime type for the current operation
*/
const char *
gdk_content_deserializer_get_mime_type (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->mime_type;
}
/**
* gdk_content_deserializer_get_gtype:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the `GType` to create an instance of.
*
* Returns: the `GType` for the current operation
*/
GType
gdk_content_deserializer_get_gtype (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), G_TYPE_INVALID);
return G_VALUE_TYPE (&deserializer->value);
}
/**
* gdk_content_deserializer_get_value:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the `GValue` to store the deserialized object in.
*
* Returns: (transfer none): the `GValue` for the current operation
*/
GValue *
gdk_content_deserializer_get_value (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return &deserializer->value;
}
/**
* gdk_content_deserializer_get_input_stream:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the input stream for the current operation.
*
* This is the stream that was passed to [func@Gdk.content_deserialize_async].
*
* Returns: (transfer none): the input stream for the current operation
*/
GInputStream *
gdk_content_deserializer_get_input_stream (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->stream;
}
/**
* gdk_content_deserializer_get_priority:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the I/O priority for the current operation.
*
* This is the priority that was passed to [func@Gdk.content_deserialize_async].
*
* Returns: the I/O priority for the current operation
*/
int
gdk_content_deserializer_get_priority (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), G_PRIORITY_DEFAULT);
return deserializer->priority;
}
/**
* gdk_content_deserializer_get_cancellable:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the cancellable for the current operation.
*
* This is the `GCancellable` that was passed to [func@Gdk.content_deserialize_async].
*
* Returns: (transfer none) (nullable): the cancellable for the current operation
*/
GCancellable *
gdk_content_deserializer_get_cancellable (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->cancellable;
}
/**
* gdk_content_deserializer_get_user_data:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the user data that was passed when the deserializer was registered.
*
* Returns: (transfer none): the user data for this deserializer
*/
gpointer
gdk_content_deserializer_get_user_data (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->user_data;
}
/**
* gdk_content_deserializer_set_task_data:
* @deserializer: a `GdkContentDeserializer`
* @data: data to associate with this operation
* @notify: destroy notify for @data
*
* Associate data with the current deserialization operation.
*/
void
gdk_content_deserializer_set_task_data (GdkContentDeserializer *deserializer,
gpointer data,
GDestroyNotify notify)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
if (deserializer->task_notify)
deserializer->task_notify (deserializer->task_data);
deserializer->task_data = data;
deserializer->task_notify = notify;
}
/**
* gdk_content_deserializer_get_task_data:
* @deserializer: a `GdkContentDeserializer`
*
* Gets the data that was associated with the current operation.
*
* See [method@Gdk.ContentDeserializer.set_task_data].
*
* Returns: (transfer none): the task data for @deserializer
*/
gpointer
gdk_content_deserializer_get_task_data (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->task_data;
}
static gboolean
gdk_content_deserializer_emit_callback (gpointer data)
{
GdkContentDeserializer *deserializer = data;
if (deserializer->callback)
{
deserializer->callback (NULL, G_ASYNC_RESULT (deserializer), deserializer->callback_data);
}
return G_SOURCE_REMOVE;
}
/**
* gdk_content_deserializer_return_success:
* @deserializer: a `GdkContentDeserializer`
*
* Indicate that the deserialization has been successfully completed.
*/
void
gdk_content_deserializer_return_success (GdkContentDeserializer *deserializer)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
g_return_if_fail (!deserializer->returned);
guint source_id;
deserializer->returned = TRUE;
source_id = g_idle_add_full (deserializer->priority,
gdk_content_deserializer_emit_callback,
deserializer,
g_object_unref);
gdk_source_set_static_name_by_id (source_id, "[gtk] gdk_content_deserializer_emit_callback");
/* NB: the idle will destroy our reference */
}
/**
* gdk_content_deserializer_return_error:
* @deserializer: a `GdkContentDeserializer`
* @error: (transfer full): a `GError`
*
* Indicate that the deserialization has ended with an error.
*
* This function consumes @error.
*/
void
gdk_content_deserializer_return_error (GdkContentDeserializer *deserializer,
GError *error)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
g_return_if_fail (!deserializer->returned);
g_return_if_fail (error != NULL);
deserializer->error = error;
/* FIXME: naming */
gdk_content_deserializer_return_success (deserializer);
}
/**
* gdk_content_register_deserializer:
* @mime_type: the mime type which the function can deserialize from
* @type: the type of objects that the function creates
* @deserialize: the callback
* @data: data that @deserialize can access
* @notify: destroy notify for @data
*
* Registers a function to deserialize object of a given type.
*/
void
gdk_content_register_deserializer (const char *mime_type,
GType type,
GdkContentDeserializeFunc deserialize,
gpointer data,
GDestroyNotify notify)
{
Deserializer *deserializer;
g_return_if_fail (mime_type != NULL);
g_return_if_fail (deserialize != NULL);
deserializer = g_new0 (Deserializer, 1);
deserializer->mime_type = g_intern_string (mime_type);
deserializer->type = type;
deserializer->deserialize = deserialize;
deserializer->data = data;
deserializer->notify = notify;
g_queue_push_tail (&deserializers, deserializer);
}
static Deserializer *
lookup_deserializer (const char *mime_type,
GType type)
{
GList *l;
g_return_val_if_fail (mime_type != NULL, NULL);
init ();
mime_type = g_intern_string (mime_type);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (deserializer->mime_type == mime_type &&
deserializer->type == type)
return deserializer;
}
return NULL;
}
/**
* gdk_content_formats_union_deserialize_gtypes:
* @formats: (transfer full): a `GdkContentFormats`
*
* Add GTypes for mime types in @formats for which deserializers are
* registered.
*
* Return: a new `GdkContentFormats`
*/
GdkContentFormats *
gdk_content_formats_union_deserialize_gtypes (GdkContentFormats *formats)
{
GdkContentFormatsBuilder *builder;
GList *l;
g_return_val_if_fail (formats != NULL, NULL);
init ();
builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_formats (builder, formats);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (gdk_content_formats_contain_mime_type (formats, deserializer->mime_type))
gdk_content_formats_builder_add_gtype (builder, deserializer->type);
}
gdk_content_formats_unref (formats);
return gdk_content_formats_builder_free_to_formats (builder);
}
/**
* gdk_content_formats_union_deserialize_mime_types:
* @formats: (transfer full): a `GdkContentFormats`
*
* Add mime types for GTypes in @formats for which deserializers are
* registered.
*
* Return: a new `GdkContentFormats`
*/
GdkContentFormats *
gdk_content_formats_union_deserialize_mime_types (GdkContentFormats *formats)
{
GdkContentFormatsBuilder *builder;
GList *l;
g_return_val_if_fail (formats != NULL, NULL);
init ();
builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_formats (builder, formats);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (gdk_content_formats_contain_gtype (formats, deserializer->type))
gdk_content_formats_builder_add_mime_type (builder, deserializer->mime_type);
}
gdk_content_formats_unref (formats);
return gdk_content_formats_builder_free_to_formats (builder);
}
static void
deserialize_not_found (GdkContentDeserializer *deserializer)
{
GError *error = g_error_new (G_IO_ERROR,
G_IO_ERROR_NOT_FOUND,
"Could not convert data from %s to %s",
gdk_content_deserializer_get_mime_type (deserializer),
g_type_name (gdk_content_deserializer_get_gtype (deserializer)));
gdk_content_deserializer_return_error (deserializer, error);
}
/**
* gdk_content_deserialize_async:
* @stream: a `GInputStream` to read the serialized content from
* @mime_type: the mime type to deserialize from
* @type: the GType to deserialize from
* @io_priority: the I/O priority of the operation
* @cancellable: (nullable): optional `GCancellable` object
* @callback: (scope async): callback to call when the operation is done
* @user_data: (closure): data to pass to the callback function
*
* Read content from the given input stream and deserialize it, asynchronously.
*
* The default I/O priority is %G_PRIORITY_DEFAULT (i.e. 0), and lower numbers
* indicate a higher priority.
*
* When the operation is finished, @callback will be called. You must then
* call [func@Gdk.content_deserialize_finish] to get the result of the operation.
*/
void
gdk_content_deserialize_async (GInputStream *stream,
const char *mime_type,
GType type,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
Deserializer *deserializer;
g_return_if_fail (G_IS_INPUT_STREAM (stream));
g_return_if_fail (mime_type != NULL);
g_return_if_fail (G_TYPE_IS_VALUE_TYPE (type));
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
g_return_if_fail (callback != NULL);
deserializer = lookup_deserializer (mime_type, type);
gdk_content_deserializer_run (mime_type,
type,
stream,
io_priority,
cancellable,
deserializer ? deserializer->deserialize : deserialize_not_found,
deserializer ? deserializer->data : NULL,
callback,
user_data);
}
/**
* gdk_content_deserialize_finish:
* @result: the `GAsyncResult`
* @value: (out): return location for the result of the operation
* @error: return location for an error
*
* Finishes a content deserialization operation.
*
* Returns: %TRUE if the operation was successful. In this case,
* @value is set. %FALSE if an error occurred. In this case,
* @error is set
*/
gboolean
gdk_content_deserialize_finish (GAsyncResult *result,
GValue *value,
GError **error)
{
GdkContentDeserializer *deserializer;
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (result), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
deserializer = GDK_CONTENT_DESERIALIZER (result);
if (G_VALUE_TYPE (value) == 0)
g_value_init (value, G_VALUE_TYPE (&deserializer->value));
else
g_return_val_if_fail (G_VALUE_HOLDS (value, G_VALUE_TYPE (&deserializer->value)), FALSE);
if (deserializer->error)
{
if (error)
*error = g_error_copy (deserializer->error);
return FALSE;
}
g_value_copy (&deserializer->value, value);
return TRUE;
}
/*** DESERIALIZERS ***/
static void
pixbuf_deserializer_finish (GObject *source,
GAsyncResult *res,
gpointer deserializer)
{
GdkPixbuf *pixbuf;
GValue *value;
GError *error = NULL;
pixbuf = gdk_pixbuf_new_from_stream_finish (res, &error);
if (pixbuf == NULL)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
value = gdk_content_deserializer_get_value (deserializer);
if (G_VALUE_HOLDS (value, GDK_TYPE_PIXBUF))
{
g_value_take_object (value, pixbuf);
}
else if (G_VALUE_HOLDS (value, GDK_TYPE_TEXTURE))
{
GdkTexture *texture;
texture = gdk_texture_new_for_pixbuf (pixbuf);
g_object_unref (pixbuf);
g_value_take_object (value, texture);
}
else
{
g_assert_not_reached ();
}
gdk_content_deserializer_return_success (deserializer);
}
static void
pixbuf_deserializer (GdkContentDeserializer *deserializer)
{
gdk_pixbuf_new_from_stream_async (gdk_content_deserializer_get_input_stream (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
pixbuf_deserializer_finish,
deserializer);
}
static void
texture_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GBytes *bytes;
GError *error = NULL;
GdkTexture *texture = NULL;
gssize written;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
bytes = g_memory_output_stream_steal_as_bytes (G_MEMORY_OUTPUT_STREAM (stream));
texture = gdk_texture_new_from_bytes (bytes, &error);
g_bytes_unref (bytes);
if (texture == NULL)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
g_value_take_object (gdk_content_deserializer_get_value (deserializer), texture);
gdk_content_deserializer_return_success (deserializer);
}
static void
texture_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output;
output = g_memory_output_stream_new_resizable ();
g_output_stream_splice_async (output,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE
| G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
texture_deserializer_finish,
deserializer);
g_object_unref (output);
}
static void
string_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GError *error = NULL;
gssize written;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
else if (written == 0)
{
/* Never return NULL, we only return that on error */
g_value_set_string (gdk_content_deserializer_get_value (deserializer), "");
}
else
{
GOutputStream *mem_stream = g_filter_output_stream_get_base_stream (G_FILTER_OUTPUT_STREAM (stream));
/* write a terminating NULL byte */
if (g_output_stream_write (mem_stream, "", 1, NULL, &error) < 0 ||
!g_output_stream_close (mem_stream, NULL, &error))
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
g_value_take_string (gdk_content_deserializer_get_value (deserializer),
g_memory_output_stream_steal_data (G_MEMORY_OUTPUT_STREAM (mem_stream)));
}
gdk_content_deserializer_return_success (deserializer);
}
static void
string_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output, *filter;
GCharsetConverter *converter;
GError *error = NULL;
converter = g_charset_converter_new ("utf-8",
gdk_content_deserializer_get_user_data (deserializer),
&error);
if (converter == NULL)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
g_charset_converter_set_use_fallback (converter, TRUE);
output = g_memory_output_stream_new_resizable ();
filter = g_converter_output_stream_new (output, G_CONVERTER (converter));
g_object_unref (output);
g_object_unref (converter);
g_output_stream_splice_async (filter,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
string_deserializer_finish,
deserializer);
g_object_unref (filter);
}
static void
file_uri_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GError *error = NULL;
gssize written;
GValue *value;
char *str;
char **uris;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
/* write terminating NULL */
if (g_output_stream_write (stream, "", 1, NULL, &error) < 0 ||
!g_output_stream_close (stream, NULL, &error))
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
str = g_memory_output_stream_steal_data (G_MEMORY_OUTPUT_STREAM (stream));
uris = g_uri_list_extract_uris (str);
g_free (str);
value = gdk_content_deserializer_get_value (deserializer);
if (G_VALUE_HOLDS (value, G_TYPE_FILE))
{
if (uris[0] != NULL)
g_value_take_object (value, g_file_new_for_uri (uris[0]));
}
else
{
GSList *l = NULL;
gsize i;
for (i = 0; uris[i] != NULL; i++)
l = g_slist_prepend (l, g_file_new_for_uri (uris[i]));
g_value_take_boxed (value, g_slist_reverse (l));
}
g_strfreev (uris);
gdk_content_deserializer_return_success (deserializer);
}
static void
file_uri_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output;
output = g_memory_output_stream_new_resizable ();
g_output_stream_splice_async (output,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
file_uri_deserializer_finish,
deserializer);
g_object_unref (output);
}
static void
color_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GError *error = NULL;
gssize written;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
else if (written == 0)
{
GdkRGBA black = GDK_RGBA ("000");
/* Never return NULL, we only return that on error */
g_value_set_boxed (gdk_content_deserializer_get_value (deserializer), &black);
}
else
{
guint16 *data;
GdkRGBA rgba;
data = (guint16 *)g_memory_output_stream_get_data (G_MEMORY_OUTPUT_STREAM (stream));
rgba.red = data[0] / 65535.0;
rgba.green = data[1] / 65535.0;
rgba.blue = data[2] / 65535.0;
rgba.alpha = data[3] / 65535.0;
g_value_set_boxed (gdk_content_deserializer_get_value (deserializer), &rgba);
}
gdk_content_deserializer_return_success (deserializer);
}
static void
color_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output;
guint16 *data;
data = g_new0 (guint16, 4);
output = g_memory_output_stream_new (data, 4 * sizeof (guint16), NULL, g_free);
g_output_stream_splice_async (output,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
color_deserializer_finish,
deserializer);
g_object_unref (output);
}
static void
init (void)
{
static gboolean initialized = FALSE;
GSList *formats, *f;
const char *charset;
if (initialized)
return;
initialized = TRUE;
gdk_content_register_deserializer ("image/png",
GDK_TYPE_TEXTURE,
texture_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("image/tiff",
GDK_TYPE_TEXTURE,
texture_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("image/jpeg",
GDK_TYPE_TEXTURE,
texture_deserializer,
NULL,
NULL);
formats = gdk_pixbuf_get_formats ();
for (f = formats; f; f = f->next)
{
GdkPixbufFormat *fmt = f->data;
char **mimes, **m;
char *name;
name = gdk_pixbuf_format_get_name (fmt);
mimes = gdk_pixbuf_format_get_mime_types (fmt);
for (m = mimes; *m; m++)
{
/* Turning pngs, jpegs and tiffs into textures is handled above */
if (!g_str_equal (name, "png") &&
!g_str_equal (name, "jpeg") &&
!g_str_equal (name, "tiff"))
gdk_content_register_deserializer (*m,
GDK_TYPE_TEXTURE,
pixbuf_deserializer,
NULL,
NULL);
gdk_content_register_deserializer (*m,
GDK_TYPE_PIXBUF,
pixbuf_deserializer,
NULL,
NULL);
}
g_strfreev (mimes);
g_free (name);
}
g_slist_free (formats);
#if defined(G_OS_UNIX) && !defined(__APPLE__)
file_transfer_portal_register ();
#endif
gdk_content_register_deserializer ("text/uri-list",
GDK_TYPE_FILE_LIST,
file_uri_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("text/uri-list",
G_TYPE_FILE,
file_uri_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("text/plain;charset=utf-8",
G_TYPE_STRING,
string_deserializer,
(gpointer) "utf-8",
NULL);
if (!g_get_charset (&charset))
{
char *mime = g_strdup_printf ("text/plain;charset=%s", charset);
gdk_content_register_deserializer (mime,
G_TYPE_STRING,
string_deserializer,
(gpointer) charset,
g_free);
g_free (mime);
}
gdk_content_register_deserializer ("text/plain",
G_TYPE_STRING,
string_deserializer,
(gpointer) "ASCII",
NULL);
gdk_content_register_deserializer ("application/x-color",
GDK_TYPE_RGBA,
color_deserializer,
NULL,
NULL);
}