[gnome-photos/wip/rishi/buffer-decoder: 7/9] Add convenience APIs



commit 2862102aa12e1626c36cced83ef0c58a89e946bc
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri Jul 27 19:50:44 2018 +0200

    Add convenience APIs
    
    https://gitlab.gnome.org/GNOME/gnome-photos/issues/63

 src/Makefile.am             |   4 +
 src/meson.build             |   1 +
 src/photos-gegl-buffer-io.c | 473 ++++++++++++++++++++++++++++++++++++++++++++
 src/photos-gegl-buffer-io.h |  90 +++++++++
 4 files changed, 568 insertions(+)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 3fbf8dde..602c0f36 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -110,6 +110,8 @@ gnome_photos_SOURCES = \
        photos-gegl-buffer-codec-jpeg.h \
        photos-gegl-buffer-codec-png.c \
        photos-gegl-buffer-codec-png.h \
+       photos-gegl-buffer-io.c \
+       photos-gegl-buffer-io.h \
        photos-gegl-buffer-loader.c \
        photos-gegl-buffer-loader.h \
        photos-gegl-buffer-loader-builder.c \
@@ -338,6 +340,8 @@ gnome_photos_thumbnailer_SOURCES = \
        photos-gegl-buffer-codec-jpeg.h \
        photos-gegl-buffer-codec-png.c \
        photos-gegl-buffer-codec-png.h \
+       photos-gegl-buffer-io.c \
+       photos-gegl-buffer-io.h \
        photos-gegl-buffer-loader.c \
        photos-gegl-buffer-loader.h \
        photos-gegl-buffer-loader-builder.c \
diff --git a/src/meson.build b/src/meson.build
index 3412a5d1..de57cd59 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -5,6 +5,7 @@ common_sources = files(
   'photos-gegl-buffer-codec.c',
   'photos-gegl-buffer-codec-jpeg.c',
   'photos-gegl-buffer-codec-png.c',
+  'photos-gegl-buffer-io.c',
   'photos-gegl-buffer-loader.c',
   'photos-gegl-buffer-loader-builder.c',
   'photos-glib.c',
diff --git a/src/photos-gegl-buffer-io.c b/src/photos-gegl-buffer-io.c
new file mode 100644
index 00000000..ce62ef98
--- /dev/null
+++ b/src/photos-gegl-buffer-io.c
@@ -0,0 +1,473 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 1999 The Free Software Foundation
+ * Copyright © 2018 Red Hat, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code from:
+ *   + GdkPixbuf
+ */
+
+
+#include "config.h"
+
+#include "photos-gegl-buffer-io.h"
+#include "photos-gegl-buffer-loader.h"
+#include "photos-gegl-buffer-loader-builder.h"
+
+
+enum
+{
+  LOAD_BUFFER_SIZE = 32768
+};
+
+
+static GeglBuffer *
+photos_gegl_buffer_load_from_stream (PhotosGeglBufferLoader *loader,
+                                     GInputStream *stream,
+                                     GCancellable *cancellable,
+                                     GError **error)
+{
+  GeglBuffer *ret_val = NULL;
+
+  while (TRUE)
+    {
+      g_autoptr (GBytes) bytes = NULL;
+      gsize size;
+
+      bytes = g_input_stream_read_bytes (stream, LOAD_BUFFER_SIZE, cancellable, error);
+      if (bytes == NULL)
+        {
+          photos_gegl_buffer_loader_close (loader, NULL);
+          goto out;
+        }
+
+      size = g_bytes_get_size (bytes);
+      if (size == 0)
+        break;
+
+      if (!photos_gegl_buffer_loader_write_bytes (loader, bytes, cancellable, error))
+        {
+          photos_gegl_buffer_loader_close (loader, NULL);
+          goto out;
+        }
+    }
+
+  if (!photos_gegl_buffer_loader_close (loader, error))
+    goto out;
+
+  ret_val = photos_gegl_buffer_loader_get_buffer (loader);
+  g_object_ref (ret_val);
+
+ out:
+  return ret_val;
+}
+
+
+static void
+photos_gegl_buffer_new_from_stream_read_bytes (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  g_autoptr (GBytes) bytes = NULL;
+  GCancellable *cancellable;
+  GInputStream *stream = G_INPUT_STREAM (source_object);
+  g_autoptr (GTask) task = G_TASK (user_data);
+  PhotosGeglBufferLoader *loader;
+  gint priority;
+  gsize size;
+
+  cancellable = g_task_get_cancellable (task);
+  loader = PHOTOS_GEGL_BUFFER_LOADER (g_task_get_source_object (task));
+  priority = GPOINTER_TO_INT (g_task_get_task_data (task));
+
+  {
+    g_autoptr (GError) error = NULL;
+
+    bytes = g_input_stream_read_bytes_finish (stream, res, &error);
+    if (error != NULL)
+      {
+        photos_gegl_buffer_loader_close (loader, NULL);
+        g_task_return_error (task, g_steal_pointer (&error));
+        goto out;
+      }
+  }
+
+  size = g_bytes_get_size (bytes);
+  if (size > 0)
+    {
+      {
+        g_autoptr (GError) error = NULL;
+
+        if (!photos_gegl_buffer_loader_write_bytes (loader, bytes, cancellable, &error))
+          {
+            photos_gegl_buffer_loader_close (loader, NULL);
+            g_task_return_error (task, g_steal_pointer (&error));
+            goto out;
+          }
+      }
+
+      g_input_stream_read_bytes_async (stream,
+                                       LOAD_BUFFER_SIZE,
+                                       priority,
+                                       cancellable,
+                                       photos_gegl_buffer_new_from_stream_read_bytes,
+                                       g_object_ref (task));
+    }
+  else
+    {
+      GeglBuffer *buffer;
+
+      {
+        g_autoptr (GError) error = NULL;
+
+        if (!photos_gegl_buffer_loader_close (loader, &error))
+          {
+            g_task_return_error (task, g_steal_pointer (&error));
+            goto out;
+          }
+      }
+
+      buffer = photos_gegl_buffer_loader_get_buffer (loader);
+      g_task_return_pointer (task, g_object_ref (buffer), g_object_unref);
+    }
+
+  out:
+    return;
+}
+
+
+static void
+photos_gegl_buffer_new_from_file_read (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  GCancellable *cancellable;
+  GFile *file = G_FILE (source_object);
+  g_autoptr (GFileInputStream) stream = NULL;
+  g_autoptr (GTask) task = G_TASK (user_data);
+  gint priority;
+
+  cancellable = g_task_get_cancellable (task);
+  priority = GPOINTER_TO_INT (g_task_get_task_data (task));
+
+  {
+    g_autoptr (GError) error = NULL;
+
+    stream = g_file_read_finish (file, res, &error);
+    if (error != NULL)
+      {
+        g_task_return_error (task, g_steal_pointer (&error));
+        goto out;
+      }
+  }
+
+  g_input_stream_read_bytes_async (G_INPUT_STREAM (stream),
+                                   LOAD_BUFFER_SIZE,
+                                   priority,
+                                   cancellable,
+                                   photos_gegl_buffer_new_from_stream_read_bytes,
+                                   g_object_ref (task));
+
+ out:
+  return;
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_file (GFile *file, GCancellable *cancellable, GError **error)
+{
+  g_autoptr (GFileInputStream) stream = NULL;
+  GeglBuffer *ret_val = NULL;
+  g_autoptr (GeglBuffer) buffer = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_val_if_fail (G_IS_FILE (file), NULL);
+  g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  stream = g_file_read (file, cancellable, error);
+  if (stream == NULL)
+    goto out;
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_file (builder, file);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  buffer = photos_gegl_buffer_load_from_stream (loader, G_INPUT_STREAM (stream), cancellable, error);
+  if (buffer == NULL)
+    goto out;
+
+  ret_val = g_object_ref (buffer);
+
+ out:
+  return ret_val;
+}
+
+
+void
+photos_gegl_buffer_new_from_file_async (GFile *file,
+                                        gint priority,
+                                        GCancellable *cancellable,
+                                        GAsyncReadyCallback callback,
+                                        gpointer user_data)
+{
+  g_autoptr (GTask) task = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_if_fail (G_IS_FILE (file));
+  g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_file (builder, file);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  task = g_task_new (loader, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_gegl_buffer_new_from_file_async);
+  g_task_set_task_data (task, GINT_TO_POINTER (priority), NULL);
+
+  g_file_read_async (file, priority, cancellable, photos_gegl_buffer_new_from_file_read, g_object_ref 
(task));
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_file_at_scale (GFile *file,
+                                           gint width,
+                                           gint height,
+                                           gboolean keep_aspect_ratio,
+                                           GCancellable *cancellable,
+                                           GError **error)
+{
+  g_autoptr (GFileInputStream) stream = NULL;
+  GeglBuffer *ret_val = NULL;
+  g_autoptr (GeglBuffer) buffer = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_val_if_fail (G_IS_FILE (file), NULL);
+  g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  stream = g_file_read (file, cancellable, error);
+  if (stream == NULL)
+    goto out;
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_file (builder, file);
+  photos_gegl_buffer_loader_builder_set_height (builder, height);
+  photos_gegl_buffer_loader_builder_set_keep_aspect_ratio (builder, keep_aspect_ratio);
+  photos_gegl_buffer_loader_builder_set_width (builder, width);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  buffer = photos_gegl_buffer_load_from_stream (loader, G_INPUT_STREAM (stream), cancellable, error);
+  if (buffer == NULL)
+    goto out;
+
+  ret_val = g_object_ref (buffer);
+
+ out:
+  return ret_val;
+}
+
+
+void
+photos_gegl_buffer_new_from_file_at_scale_async (GFile *file,
+                                                 gint width,
+                                                 gint height,
+                                                 gboolean keep_aspect_ratio,
+                                                 gint priority,
+                                                 GCancellable *cancellable,
+                                                 GAsyncReadyCallback callback,
+                                                 gpointer user_data)
+{
+  g_autoptr (GTask) task = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_if_fail (G_IS_FILE (file));
+  g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_file (builder, file);
+  photos_gegl_buffer_loader_builder_set_height (builder, height);
+  photos_gegl_buffer_loader_builder_set_keep_aspect_ratio (builder, keep_aspect_ratio);
+  photos_gegl_buffer_loader_builder_set_width (builder, width);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  task = g_task_new (loader, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_gegl_buffer_new_from_file_at_scale_async);
+  g_task_set_task_data (task, GINT_TO_POINTER (priority), NULL);
+
+  g_file_read_async (file, priority, cancellable, photos_gegl_buffer_new_from_file_read, g_object_ref 
(task));
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_file_finish (GAsyncResult *res, GError **error)
+{
+  GTask *task;
+
+  g_return_val_if_fail (G_IS_TASK (res), NULL);
+  task = G_TASK (res);
+
+  g_return_val_if_fail (g_task_get_source_tag (task) == photos_gegl_buffer_new_from_file_async
+                        || g_task_get_source_tag (task) == photos_gegl_buffer_new_from_file_at_scale_async,
+                        NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  return g_task_propagate_pointer (task, error);
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_stream (GInputStream *stream, GCancellable *cancellable, GError **error)
+{
+  GeglBuffer *ret_val = NULL;
+  g_autoptr (GeglBuffer) buffer = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
+  g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  buffer = photos_gegl_buffer_load_from_stream (loader, stream, cancellable, error);
+  if (buffer == NULL)
+    goto out;
+
+  ret_val = g_object_ref (buffer);
+
+ out:
+  return ret_val;
+}
+
+
+void
+photos_gegl_buffer_new_from_stream_async (GInputStream *stream,
+                                          gint priority,
+                                          GCancellable *cancellable,
+                                          GAsyncReadyCallback callback,
+                                          gpointer user_data)
+{
+  g_autoptr (GTask) task = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_if_fail (G_IS_INPUT_STREAM (stream));
+  g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  task = g_task_new (loader, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_gegl_buffer_new_from_stream_async);
+  g_task_set_task_data (task, GINT_TO_POINTER (priority), NULL);
+
+  g_input_stream_read_bytes_async (stream,
+                                   LOAD_BUFFER_SIZE,
+                                   priority,
+                                   cancellable,
+                                   photos_gegl_buffer_new_from_stream_read_bytes,
+                                   g_object_ref (task));
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_stream_at_scale (GInputStream *stream,
+                                             gint width,
+                                             gint height,
+                                             gboolean keep_aspect_ratio,
+                                             GCancellable *cancellable,
+                                             GError **error)
+{
+  GeglBuffer *ret_val = NULL;
+  g_autoptr (GeglBuffer) buffer = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
+  g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_height (builder, height);
+  photos_gegl_buffer_loader_builder_set_keep_aspect_ratio (builder, keep_aspect_ratio);
+  photos_gegl_buffer_loader_builder_set_width (builder, width);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  buffer = photos_gegl_buffer_load_from_stream (loader, stream, cancellable, error);
+  if (buffer == NULL)
+    goto out;
+
+  ret_val = g_object_ref (buffer);
+
+ out:
+  return ret_val;
+}
+
+
+void
+photos_gegl_buffer_new_from_stream_at_scale_async (GInputStream *stream,
+                                                   gint width,
+                                                   gint height,
+                                                   gboolean keep_aspect_ratio,
+                                                   gint priority,
+                                                   GCancellable *cancellable,
+                                                   GAsyncReadyCallback callback,
+                                                   gpointer user_data)
+{
+  g_autoptr (GTask) task = NULL;
+  g_autoptr (PhotosGeglBufferLoader) loader = NULL;
+  g_autoptr (PhotosGeglBufferLoaderBuilder) builder = NULL;
+
+  g_return_if_fail (G_IS_INPUT_STREAM (stream));
+  g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
+
+  builder = photos_gegl_buffer_loader_builder_new ();
+  photos_gegl_buffer_loader_builder_set_height (builder, height);
+  photos_gegl_buffer_loader_builder_set_keep_aspect_ratio (builder, keep_aspect_ratio);
+  photos_gegl_buffer_loader_builder_set_width (builder, width);
+  loader = photos_gegl_buffer_loader_builder_to_loader (builder);
+
+  task = g_task_new (loader, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_gegl_buffer_new_from_stream_at_scale_async);
+  g_task_set_task_data (task, GINT_TO_POINTER (priority), NULL);
+
+  g_input_stream_read_bytes_async (stream,
+                                   LOAD_BUFFER_SIZE,
+                                   priority,
+                                   cancellable,
+                                   photos_gegl_buffer_new_from_stream_read_bytes,
+                                   g_object_ref (task));
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_new_from_stream_finish (GAsyncResult *res, GError **error)
+{
+  GTask *task;
+
+  g_return_val_if_fail (G_IS_TASK (res), NULL);
+  task = G_TASK (res);
+
+  g_return_val_if_fail (g_task_get_source_tag (task) == photos_gegl_buffer_new_from_stream_async
+                        || g_task_get_source_tag (task) == photos_gegl_buffer_new_from_stream_at_scale_async,
+                        NULL);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  return g_task_propagate_pointer (task, error);
+}
diff --git a/src/photos-gegl-buffer-io.h b/src/photos-gegl-buffer-io.h
new file mode 100644
index 00000000..155ece51
--- /dev/null
+++ b/src/photos-gegl-buffer-io.h
@@ -0,0 +1,90 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright © 1999 The Free Software Foundation
+ * Copyright © 2018 Red Hat, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Based on code from:
+ *   + GdkPixbuf
+ */
+
+#ifndef PHOTOS_GEGL_BUFFER_IO_H
+#define PHOTOS_GEGL_BUFFER_IO_H
+
+#include <gegl.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+GeglBuffer    *photos_gegl_buffer_new_from_file                     (GFile *file,
+                                                                     GCancellable *cancellable,
+                                                                     GError **error);
+
+void           photos_gegl_buffer_new_from_file_async               (GFile *file,
+                                                                     gint priority,
+                                                                     GCancellable *cancellable,
+                                                                     GAsyncReadyCallback callback,
+                                                                     gpointer user_data);
+
+GeglBuffer    *photos_gegl_buffer_new_from_file_at_scale            (GFile *file,
+                                                                     gint width,
+                                                                     gint height,
+                                                                     gboolean keep_aspect_ratio,
+                                                                     GCancellable *cancellable,
+                                                                     GError **error);
+
+void           photos_gegl_buffer_new_from_file_at_scale_async      (GFile *file,
+                                                                     gint width,
+                                                                     gint height,
+                                                                     gboolean keep_aspect_ratio,
+                                                                     gint priority,
+                                                                     GCancellable *cancellable,
+                                                                     GAsyncReadyCallback callback,
+                                                                     gpointer user_data);
+
+GeglBuffer    *photos_gegl_buffer_new_from_file_finish              (GAsyncResult *res, GError **error);
+
+GeglBuffer    *photos_gegl_buffer_new_from_stream                   (GInputStream *stream,
+                                                                     GCancellable *cancellable,
+                                                                     GError **error);
+
+void           photos_gegl_buffer_new_from_stream_async             (GInputStream *stream,
+                                                                     gint priority,
+                                                                     GCancellable *cancellable,
+                                                                     GAsyncReadyCallback callback,
+                                                                     gpointer user_data);
+
+GeglBuffer    *photos_gegl_buffer_new_from_stream_at_scale          (GInputStream *stream,
+                                                                     gint width,
+                                                                     gint height,
+                                                                     gboolean keep_aspect_ratio,
+                                                                     GCancellable *cancellable,
+                                                                     GError **error);
+
+void           photos_gegl_buffer_new_from_stream_at_scale_async    (GInputStream *stream,
+                                                                     gint width,
+                                                                     gint height,
+                                                                     gboolean keep_aspect_ratio,
+                                                                     gint priority,
+                                                                     GCancellable *cancellable,
+                                                                     GAsyncReadyCallback callback,
+                                                                     gpointer user_data);
+
+GeglBuffer    *photos_gegl_buffer_new_from_stream_finish            (GAsyncResult *res, GError **error);
+
+G_END_DECLS
+
+#endif /* PHOTOS_GEGL_BUFFER_IO_H */


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