[gtk/gamma-shenanigans: 5/8] Add async tiff load/save code

[Matthias Clasen <matthiasc src gnome org>]

commit 2031b66a0a7f3e3eec808f468649a3f61746a02a
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 9 22:53:36 2021 -0400

    Add async tiff load/save code
    
    This will be used in content (de)serialization.

 gdk/gdktiff.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 gdk/gdktiff.h |  39 ++++++++++++++++-----
 2 files changed, 137 insertions(+), 9 deletions(-)
---
diff --git a/gdk/gdktiff.c b/gdk/gdktiff.c
index 090b6c4e44..35739079f6 100644
--- a/gdk/gdktiff.c
+++ b/gdk/gdktiff.c
@@ -282,6 +282,7 @@ tiff_open (gpointer      stream,
 }
 
 /* }}} */
+/* {{{ Public API */
 
 static struct {
   GdkMemoryFormat format;
@@ -512,4 +513,110 @@ gdk_load_tiff (GInputStream     *stream,
   return texture;
 }
 
+/* }}} */
+/* {{{ Async code */
+
+static void
+load_tiff_in_thread (GTask        *task,
+                     gpointer      source_object,
+                     gpointer      task_data,
+                     GCancellable *cancellable)
+{
+  GInputStream *stream = source_object;
+  GdkTexture *texture;
+  GError *error = NULL;
+
+  texture = gdk_load_tiff (stream, &error);
+
+  if (texture)
+    g_task_return_pointer (task, texture, g_object_unref);
+  else
+    g_task_return_error (task, error);
+}
+
+void
+gdk_load_tiff_async (GInputStream         *stream,
+                     GCancellable         *cancellable,
+                     GAsyncReadyCallback   callback,
+                     gpointer              user_data)
+{
+  GTask *task;
+
+  task = g_task_new (stream, cancellable, callback, user_data);
+  g_task_run_in_thread (task, load_tiff_in_thread);
+  g_object_unref (task);
+}
+
+GdkTexture *
+gdk_load_tiff_finish (GAsyncResult  *result,
+                      GError       **error)
+{
+  return g_task_propagate_pointer (G_TASK (result), error);
+}
+
+typedef struct {
+  const guchar *data;
+  int width;
+  int height;
+  GdkMemoryFormat format;
+} SaveTiffData;
+
+static void
+save_tiff_in_thread (GTask        *task,
+                     gpointer      source_object,
+                     gpointer      task_data,
+                     GCancellable *cancellable)
+{
+  GOutputStream *stream = source_object;
+  SaveTiffData *data = task_data;
+  GError *error = NULL;
+  gboolean result;
+
+  result = gdk_save_tiff (stream,
+                          data->data,
+                          data->width,
+                          data->height,
+                          data->format,
+                          &error);
+
+  if (result)
+    g_task_return_boolean (task, result);
+  else
+    g_task_return_error (task, error);
+}
+
+void
+gdk_save_tiff_async (GOutputStream          *stream,
+                     const guchar           *data,
+                     int                     width,
+                     int                     height,
+                     GdkMemoryFormat         format,
+                     GCancellable           *cancellable,
+                     GAsyncReadyCallback     callback,
+                     gpointer                user_data)
+{
+  GTask *task;
+  SaveTiffData *save_data;
+
+  save_data = g_new0 (SaveTiffData, 1);
+  save_data->data = data;
+  save_data->width = width;
+  save_data->height = height;
+  save_data->format = format;
+
+  task = g_task_new (stream, cancellable, callback, user_data);
+  g_task_set_task_data (task, save_data, g_free);
+  g_task_run_in_thread (task, save_tiff_in_thread);
+  g_object_unref (task);
+}
+
+gboolean
+gdk_save_tiff_finish (GAsyncResult  *result,
+                      GError       **error)
+{
+  return g_task_propagate_boolean (G_TASK (result), error);
+}
+
+/* }}} */
+
 /* vim:set foldmethod=marker expandtab: */
diff --git a/gdk/gdktiff.h b/gdk/gdktiff.h
index aeda38bb35..10fbddc7f2 100644
--- a/gdk/gdktiff.h
+++ b/gdk/gdktiff.h
@@ -21,14 +21,35 @@
 #include "gdkmemorytexture.h"
 #include <gio/gio.h>
 
-GdkTexture *gdk_load_tiff      (GInputStream     *stream,
-                                GError          **error);
-
-gboolean gdk_save_tiff         (GOutputStream    *stream,
-                                const guchar     *data,
-                                int               width,
-                                int               height,
-                                GdkMemoryFormat   format,
-                                GError          **error);
+GdkTexture *gdk_load_tiff         (GInputStream     *stream,
+                                   GError          **error);
+
+void        gdk_load_tiff_async   (GInputStream           *stream,
+                                   GCancellable           *cancellable,
+                                   GAsyncReadyCallback     callback,
+                                   gpointer                user_data);
+
+GdkTexture *gdk_load_tiff_finish  (GAsyncResult           *result,
+                                   GError                **error);
+
+gboolean    gdk_save_tiff         (GOutputStream    *stream,
+                                   const guchar     *data,
+                                   int               width,
+                                   int               height,
+                                   GdkMemoryFormat   format,
+                                   GError          **error);
+
+void        gdk_save_tiff_async  (GOutputStream          *stream,
+                                  const guchar           *data,
+                                  int                     width,
+                                  int                     height,
+                                  GdkMemoryFormat         format,
+                                  GCancellable           *cancellable,
+                                  GAsyncReadyCallback     callback,
+                                  gpointer                user_data);
+
+gboolean    gdk_save_tiff_finish (GAsyncResult           *result,
+                                  GError                **error);
+
 
 #endif