[gnome-photos/wip/rishi/buffer-decoder: 3/8] Add PhotosGeglBufferLoaderBuilder

[Debarshi Ray <debarshir src gnome org>]

commit f3ae6c5db6932b4deddc804d65ec9abe7ba48ac2
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Aug 1 17:16:47 2018 +0200

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

 src/Makefile.am                         |   4 +
 src/meson.build                         |   1 +
 src/photos-gegl-buffer-loader-builder.c | 264 ++++++++++++++++++++++++++++++++
 src/photos-gegl-buffer-loader-builder.h |  53 +++++++
 4 files changed, 322 insertions(+)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 79cfcaa2..3285fa95 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -108,6 +108,8 @@ gnome_photos_SOURCES = \
        photos-gegl-buffer-codec.h \
        photos-gegl-buffer-loader.c \
        photos-gegl-buffer-loader.h \
+       photos-gegl-buffer-loader-builder.c \
+       photos-gegl-buffer-loader-builder.h \
        photos-gesture-zoom.c \
        photos-gesture-zoom.h \
        photos-glib.c \
@@ -330,6 +332,8 @@ gnome_photos_thumbnailer_SOURCES = \
        photos-gegl-buffer-codec.h \
        photos-gegl-buffer-loader.c \
        photos-gegl-buffer-loader.h \
+       photos-gegl-buffer-loader-builder.c \
+       photos-gegl-buffer-loader-builder.h \
        photos-glib.c \
        photos-glib.h \
        photos-jpeg-count.c \
diff --git a/src/meson.build b/src/meson.build
index 56c53d4f..98545bb1 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -4,6 +4,7 @@ common_sources = files(
   'photos-gegl.c',
   'photos-gegl-buffer-codec.c',
   'photos-gegl-buffer-loader.c',
+  'photos-gegl-buffer-loader-builder.c',
   'photos-glib.c',
   'photos-jpeg-count.c',
   'photos-operation-insta-curve.c',
diff --git a/src/photos-gegl-buffer-loader-builder.c b/src/photos-gegl-buffer-loader-builder.c
new file mode 100644
index 00000000..f1243684
--- /dev/null
+++ b/src/photos-gegl-buffer-loader-builder.c
@@ -0,0 +1,264 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * 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/>.
+ */
+
+
+#include "config.h"
+
+#include "photos-gegl-buffer-loader-builder.h"
+
+
+struct _PhotosGeglBufferLoaderBuilder
+{
+  GObject parent_instance;
+  GFile *file;
+  gboolean preserve_aspect_ratio;
+  gboolean sealed;
+  gint height;
+  gint width;
+};
+
+enum
+{
+  PROP_0,
+  PROP_FILE,
+  PROP_HEIGHT,
+  PROP_PRESERVE_ASPECT_RATIO,
+  PROP_WIDTH
+};
+
+
+G_DEFINE_TYPE (PhotosGeglBufferLoaderBuilder, photos_gegl_buffer_loader_builder, G_TYPE_OBJECT);
+
+
+static void
+photos_gegl_buffer_loader_builder_dispose (GObject *object)
+{
+  PhotosGeglBufferLoaderBuilder *self = PHOTOS_GEGL_BUFFER_LOADER_BUILDER (object);
+
+  g_clear_object (&self->file);
+
+  G_OBJECT_CLASS (photos_gegl_buffer_loader_builder_parent_class)->dispose (object);
+}
+
+
+static void
+photos_gegl_buffer_loader_builder_set_property (GObject *object,
+                                                guint prop_id,
+                                                const GValue *value,
+                                                GParamSpec *pspec)
+{
+  PhotosGeglBufferLoaderBuilder *self = PHOTOS_GEGL_BUFFER_LOADER_BUILDER (object);
+
+  switch (prop_id)
+    {
+    case PROP_FILE:
+      {
+        GFile *file;
+
+        file = G_FILE (g_value_get_object (value));
+        photos_gegl_buffer_loader_builder_set_file (self, file);
+        break;
+      }
+
+    case PROP_HEIGHT:
+      {
+        gint height;
+
+        height = g_value_get_int (value);
+        photos_gegl_buffer_loader_builder_set_height (self, height);
+        break;
+      }
+
+    case PROP_PRESERVE_ASPECT_RATIO:
+      {
+        gboolean preserve_aspect_ratio;
+
+        preserve_aspect_ratio = g_value_get_boolean (value);
+        photos_gegl_buffer_loader_builder_set_preserve_aspect_ratio (self, preserve_aspect_ratio);
+        break;
+      }
+
+    case PROP_WIDTH:
+      {
+        gint width;
+
+        width = g_value_get_int (value);
+        photos_gegl_buffer_loader_builder_set_width (self, width);
+        break;
+      }
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+
+static void
+photos_gegl_buffer_loader_builder_init (PhotosGeglBufferLoaderBuilder *self)
+{
+}
+
+
+static void
+photos_gegl_buffer_loader_builder_class_init (PhotosGeglBufferLoaderBuilderClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->dispose = photos_gegl_buffer_loader_builder_dispose;
+  object_class->set_property = photos_gegl_buffer_loader_builder_set_property;
+
+  g_object_class_install_property (object_class,
+                                   PROP_FILE,
+                                   g_param_spec_object ("file",
+                                                        "File",
+                                                        "The file from which to load a GeglBuffer",
+                                                        G_TYPE_FILE,
+                                                        G_PARAM_EXPLICIT_NOTIFY
+                                                        | G_PARAM_STATIC_STRINGS
+                                                        | G_PARAM_WRITABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_HEIGHT,
+                                   g_param_spec_int ("height",
+                                                     "Height",
+                                                     "The desired height of the GeglBuffer being loaded",
+                                                     -1,
+                                                     G_MAXINT,
+                                                     -1,
+                                                     G_PARAM_EXPLICIT_NOTIFY
+                                                     | G_PARAM_STATIC_STRINGS
+                                                     | G_PARAM_WRITABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_PRESERVE_ASPECT_RATIO,
+                                   g_param_spec_boolean ("preserve-aspect-ratio",
+                                                         "Preserve aspect ratio",
+                                                         "Whether to preserve the aspect ratio of the 
GeglBuffer "
+                                                         "when scaling, or not",
+                                                         TRUE,
+                                                         G_PARAM_EXPLICIT_NOTIFY
+                                                         | G_PARAM_STATIC_STRINGS
+                                                         | G_PARAM_WRITABLE));
+
+  g_object_class_install_property (object_class,
+                                   PROP_WIDTH,
+                                   g_param_spec_int ("width",
+                                                     "Width",
+                                                     "The desired width of the GeglBuffer being loaded",
+                                                     -1,
+                                                     G_MAXINT,
+                                                     -1,
+                                                     G_PARAM_EXPLICIT_NOTIFY
+                                                     | G_PARAM_STATIC_STRINGS
+                                                     | G_PARAM_WRITABLE));
+}
+
+
+PhotosGeglBufferLoaderBuilder *
+photos_gegl_buffer_loader_builder_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_GEGL_BUFFER_LOADER_BUILDER, NULL);
+}
+
+
+PhotosGeglBufferLoaderBuilder *
+photos_gegl_buffer_loader_builder_set_file (PhotosGeglBufferLoaderBuilder *self, GFile *file)
+{
+  g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER_BUILDER (self), NULL);
+  g_return_val_if_fail (!self->sealed, NULL);
+
+  g_return_val_if_fail (G_IS_FILE (file), NULL);
+
+  if (g_set_object (&self->file, file))
+    g_object_notify (G_OBJECT (self), "file");
+
+  return self;
+}
+
+
+PhotosGeglBufferLoaderBuilder *
+photos_gegl_buffer_loader_builder_set_height (PhotosGeglBufferLoaderBuilder *self, gint height)
+{
+  g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER_BUILDER (self), NULL);
+  g_return_val_if_fail (height >= -1, NULL);
+  g_return_val_if_fail (!self->sealed, NULL);
+
+  if (self->height != height)
+    {
+      self->height = height;
+      g_object_notify (G_OBJECT (self), "height");
+    }
+
+  return self;
+}
+
+
+PhotosGeglBufferLoaderBuilder *
+photos_gegl_buffer_loader_builder_set_preserve_aspect_ratio (PhotosGeglBufferLoaderBuilder *self,
+                                                             gboolean preserve_aspect_ratio)
+{
+  g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER_BUILDER (self), NULL);
+  g_return_val_if_fail (!self->sealed, NULL);
+
+  if (self->preserve_aspect_ratio != preserve_aspect_ratio)
+    {
+      self->preserve_aspect_ratio = preserve_aspect_ratio;
+      g_object_notify (G_OBJECT (self), "preserve-aspect-ratio");
+    }
+
+  return self;
+}
+
+
+PhotosGeglBufferLoaderBuilder *
+photos_gegl_buffer_loader_builder_set_width (PhotosGeglBufferLoaderBuilder *self, gint width)
+{
+  g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER_BUILDER (self), NULL);
+  g_return_val_if_fail (width >= -1, NULL);
+  g_return_val_if_fail (!self->sealed, NULL);
+
+  if (self->width != width)
+    {
+      self->width = width;
+      g_object_notify (G_OBJECT (self), "width");
+    }
+
+  return self;
+}
+
+
+PhotosGeglBufferLoader *
+photos_gegl_buffer_loader_builder_to_loader (PhotosGeglBufferLoaderBuilder *self)
+{
+  PhotosGeglBufferLoader *loader;
+
+  g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER_BUILDER (self), NULL);
+  g_return_val_if_fail (!self->sealed, NULL);
+
+  self->sealed = TRUE;
+  loader = g_object_new (PHOTOS_TYPE_GEGL_BUFFER_LOADER,
+                         "file", self->file,
+                         "height", self->height,
+                         "preserve-aspect-ratio", self->preserve_aspect_ratio,
+                         "width", self->width,
+                         NULL);
+
+  g_return_val_if_fail (self->sealed, NULL);
+  return loader;
+}
diff --git a/src/photos-gegl-buffer-loader-builder.h b/src/photos-gegl-buffer-loader-builder.h
new file mode 100644
index 00000000..72f21f2e
--- /dev/null
+++ b/src/photos-gegl-buffer-loader-builder.h
@@ -0,0 +1,53 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * 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/>.
+ */
+
+#ifndef PHOTOS_GEGL_BUFFER_LOADER_BUILDER_H
+#define PHOTOS_GEGL_BUFFER_LOADER_BUILDER_H
+
+#include <gio/gio.h>
+
+#include "photos-gegl-buffer-loader.h"
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_GEGL_BUFFER_LOADER_BUILDER (photos_gegl_buffer_loader_builder_get_type ())
+G_DECLARE_FINAL_TYPE (PhotosGeglBufferLoaderBuilder,
+                      photos_gegl_buffer_loader_builder,
+                      PHOTOS,
+                      GEGL_BUFFER_LOADER_BUILDER,
+                      GObject);
+
+PhotosGeglBufferLoaderBuilder *photos_gegl_buffer_loader_builder_new         (void);
+
+PhotosGeglBufferLoaderBuilder *photos_gegl_buffer_loader_builder_set_file    (PhotosGeglBufferLoaderBuilder 
*self,
+                                                                              GFile *file);
+
+PhotosGeglBufferLoaderBuilder *photos_gegl_buffer_loader_builder_set_height  (PhotosGeglBufferLoaderBuilder 
*self,
+                                                                              gint height);
+
+PhotosGeglBufferLoaderBuilder *photos_gegl_buffer_loader_builder_set_preserve_aspect_ratio 
(PhotosGeglBufferLoaderBuilder *self,
+                                                                                            gboolean 
preserve_aspect_ratio);
+
+PhotosGeglBufferLoaderBuilder *photos_gegl_buffer_loader_builder_set_width   (PhotosGeglBufferLoaderBuilder 
*self,
+                                                                              gint width);
+
+PhotosGeglBufferLoader        *photos_gegl_buffer_loader_builder_to_loader   (PhotosGeglBufferLoaderBuilder 
*self);
+
+G_END_DECLS
+
+#endif /* PHOTOS_GEGL_BUFFER_LOADER_BUILDER_H */