[gnome-photos/wip/rishi/buffer-decoder: 10/16] Add PhotosGeglBufferLoader
- From: Debarshi Ray <debarshir src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-photos/wip/rishi/buffer-decoder: 10/16] Add PhotosGeglBufferLoader
- Date: Tue, 13 Nov 2018 16:42:03 +0000 (UTC)
commit ae14a1fccd24eb74522c71fd45d760840c3ec5aa
Author: Debarshi Ray <debarshir gnome org>
Date: Sun Apr 29 00:20:29 2018 +0200
Add PhotosGeglBufferLoader
https://gitlab.gnome.org/GNOME/gnome-photos/issues/63
src/Makefile.am | 2 +
src/meson.build | 1 +
src/photos-gegl-buffer-loader.c | 607 ++++++++++++++++++++++++++++++++++++++++
src/photos-gegl-buffer-loader.h | 59 ++++
4 files changed, 669 insertions(+)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 10f903b0..344761d4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -28,6 +28,8 @@ libgnome_photos_la_SOURCES = \
photos-gegl.h \
photos-gegl-buffer-codec.c \
photos-gegl-buffer-codec.h \
+ photos-gegl-buffer-loader.c \
+ photos-gegl-buffer-loader.h \
photos-jpeg-count.c \
photos-jpeg-count.h \
photos-operation-insta-common.h \
diff --git a/src/meson.build b/src/meson.build
index bd2a9d15..9e3caee0 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -5,6 +5,7 @@ sources = files(
'photos-error.c',
'photos-gegl.c',
'photos-gegl-buffer-codec.c',
+ 'photos-gegl-buffer-loader.c',
'photos-jpeg-count.c',
'photos-operation-insta-curve.c',
'photos-operation-insta-filter.c',
diff --git a/src/photos-gegl-buffer-loader.c b/src/photos-gegl-buffer-loader.c
new file mode 100644
index 00000000..06cfa969
--- /dev/null
+++ b/src/photos-gegl-buffer-loader.c
@@ -0,0 +1,607 @@
+/*
+ * 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 <string.h>
+
+#include "photos-debug.h"
+#include "photos-error.h"
+#include "photos-gegl-buffer-codec.h"
+#include "photos-gegl-buffer-loader.h"
+#include "photos-marshalers.h"
+
+
+enum
+{
+ SNIFF_BUFFER_SIZE = 4096
+};
+
+struct _PhotosGeglBufferLoader
+{
+ GObject parent_instance;
+ GFile *file;
+ PhotosGeglBufferCodec *codec;
+ gboolean closed;
+ gboolean keep_aspect_ratio;
+ gint height;
+ gint width;
+ guchar header_buf[SNIFF_BUFFER_SIZE];
+ gsize header_buf_offset;
+};
+
+enum
+{
+ PROP_0,
+ PROP_BUFFER,
+ PROP_FILE,
+ PROP_HEIGHT,
+ PROP_KEEP_ASPECT_RATIO,
+ PROP_WIDTH
+};
+
+enum
+{
+ SIZE_PREPARED,
+ LAST_SIGNAL
+};
+
+static guint signals[LAST_SIGNAL] = { 0 };
+
+
+G_DEFINE_TYPE (PhotosGeglBufferLoader, photos_gegl_buffer_loader, G_TYPE_OBJECT);
+
+
+static PhotosGeglBufferCodec *
+photos_gegl_buffer_loader_find_codec (PhotosGeglBufferLoader *self, GError **error)
+{
+ GIOExtensionPoint *extension_point;
+ GList *extensions;
+ GList *l;
+ PhotosGeglBufferCodec *ret_val = NULL;
+ g_autoptr (PhotosGeglBufferCodec) codec = NULL;
+ gboolean uncertain;
+ g_autofree gchar *content_type = NULL;
+ g_autofree gchar *path = NULL;
+
+ if (self->file != NULL)
+ path = g_file_get_path (self->file);
+
+ content_type = g_content_type_guess (NULL, self->header_buf, self->header_buf_offset, &uncertain);
+ if ((uncertain
+ || g_strcmp0 (content_type, "text/plain") == 0
+ || g_strcmp0 (content_type, "application/gzip") == 0)
+ && path != NULL)
+ {
+ g_free (content_type);
+ content_type = g_content_type_guess (path, self->header_buf, self->header_buf_offset, NULL);
+ }
+
+ extension_point = g_io_extension_point_lookup (PHOTOS_GEGL_BUFFER_CODEC_EXTENSION_POINT_NAME);
+ extensions = g_io_extension_point_get_extensions (extension_point);
+ for (l = extensions; l != NULL; l = l->next)
+ {
+ GIOExtension *extension = (GIOExtension *) l->data;
+ PhotosGeglBufferCodecClass *buffer_codec_class; /* TODO: use g_autoptr */
+ gint i;
+
+ buffer_codec_class = PHOTOS_GEGL_BUFFER_CODEC_CLASS (g_io_extension_ref_class (extension));
+ for (i = 0; buffer_codec_class->mime_types[i] != NULL; i++)
+ {
+ g_autofree gchar *codec_content_type = NULL;
+
+ codec_content_type = g_content_type_from_mime_type (buffer_codec_class->mime_types[i]);
+ if (g_content_type_equals (codec_content_type, content_type))
+ {
+ GType type;
+
+ type = g_io_extension_get_type (extension);
+ codec = PHOTOS_GEGL_BUFFER_CODEC (g_object_new (type, NULL));
+ break;
+ }
+ }
+
+ g_type_class_unref (buffer_codec_class);
+ }
+
+ if (codec == NULL)
+ {
+ if (path == NULL)
+ {
+ g_set_error_literal (error, PHOTOS_ERROR, 0, "Unrecognized image file format");
+ }
+ else
+ {
+ g_autofree gchar *display_name = NULL;
+
+ display_name = g_filename_display_name (path);
+ g_set_error (error,
+ PHOTOS_ERROR,
+ 0,
+ "Couldn’t recognize the image file format for file “%s”",
+ display_name);
+ }
+
+ goto out;
+ }
+
+ ret_val = g_object_ref (codec);
+
+ out:
+ return ret_val;
+}
+
+
+static void
+photos_gegl_buffer_loader_notify_buffer (PhotosGeglBufferLoader *self)
+{
+ const Babl *format;
+ GeglBuffer *buffer;
+ GeglRectangle bbox;
+ const gchar *type_name;
+ const gchar *format_name;
+
+ g_return_if_fail (PHOTOS_IS_GEGL_BUFFER_CODEC (self->codec));
+
+ buffer = photos_gegl_buffer_codec_get_buffer (self->codec);
+ g_return_if_fail (GEGL_IS_BUFFER (buffer));
+
+ type_name = G_OBJECT_TYPE_NAME (self->codec);
+ bbox = *gegl_buffer_get_extent (buffer);
+ format = gegl_buffer_get_format (buffer);
+ format_name = babl_get_name (format);
+ photos_debug (PHOTOS_DEBUG_GEGL, "GeglBufferLoader: Buffer created by %s: %d, %d, %d×%d, %s",
+ type_name,
+ bbox.x,
+ bbox.y,
+ bbox.width,
+ bbox.height,
+ format_name);
+
+ g_object_notify (G_OBJECT (self), "buffer");
+}
+
+
+static void
+photos_gegl_buffer_loader_size_prepared (PhotosGeglBufferLoader *self, guint width, guint height)
+{
+ gdouble target_height = (gdouble) height;
+ gdouble target_width = (gdouble) width;
+
+ g_signal_emit (self, signals[SIZE_PREPARED], 0, width, height);
+
+ if (self->keep_aspect_ratio && (self->height > 0 || self->width > 0))
+ {
+ if (self->width < 0)
+ {
+ target_width = (gdouble) width * (gdouble) self->height / (gdouble) height;
+ target_height = (gdouble) self->height;
+ }
+ else if (self->height < 0)
+ {
+ target_height = (gdouble) height * (gdouble) self->width / (gdouble) width;
+ target_width = (gdouble) self->width;
+ }
+ else if ((gdouble) height / (gdouble) width > (gdouble) self->height / (gdouble) self->width)
+ {
+ target_width = (gdouble) width * (gdouble) self->height / (gdouble) height;
+ target_height = (gdouble) self->height;
+ }
+ else
+ {
+ target_height = (gdouble) height * (gdouble) self->width / (gdouble) width;
+ target_width = (gdouble) self->width;
+ }
+ }
+ else
+ {
+ if (self->height > 0)
+ target_height = (gdouble) self->height;
+
+ if (self->width > 0)
+ target_width = (gdouble) self->width;
+ }
+
+ g_return_if_fail (target_height > 0.0);
+ g_return_if_fail (target_width > 0.0);
+
+ photos_gegl_buffer_codec_set_height (self->codec, target_height);
+ photos_gegl_buffer_codec_set_width (self->codec, target_width);
+}
+
+
+static gboolean
+photos_gegl_buffer_loader_load_codec (PhotosGeglBufferLoader *self, const gchar *codec_name, GError **error)
+{
+ gboolean ret_val = FALSE;
+
+ g_return_val_if_fail (self->codec == NULL, FALSE);
+
+ if (codec_name == NULL)
+ {
+ self->codec = photos_gegl_buffer_loader_find_codec (self, error);
+ if (self->codec == NULL)
+ goto out;
+ }
+ else
+ {
+ GIOExtension *extension;
+ GIOExtensionPoint *extension_point;
+ GType type;
+
+ extension_point = g_io_extension_point_lookup (PHOTOS_GEGL_BUFFER_CODEC_EXTENSION_POINT_NAME);
+ extension = g_io_extension_point_get_extension_by_name (extension_point, codec_name);
+ if (extension == NULL)
+ {
+ g_set_error (error, PHOTOS_ERROR, 0, "Codec type “%s” is not supported", codec_name);
+ goto out;
+ }
+
+ type = g_io_extension_get_type (extension);
+ self->codec = PHOTOS_GEGL_BUFFER_CODEC (g_object_new (type, NULL));
+ }
+
+ g_signal_connect_swapped (self->codec,
+ "notify::buffer",
+ G_CALLBACK (photos_gegl_buffer_loader_notify_buffer),
+ self);
+
+ g_signal_connect_swapped (self->codec,
+ "size-prepared",
+ G_CALLBACK (photos_gegl_buffer_loader_size_prepared),
+ self);
+
+ if (!photos_gegl_buffer_codec_load_begin (self->codec, error))
+ goto out;
+
+ if (self->header_buf_offset > 0)
+ {
+ if (!photos_gegl_buffer_codec_load_increment (self->codec, self->header_buf, self->header_buf_offset,
error))
+ goto out;
+ }
+
+ ret_val = TRUE;
+
+ out:
+ return ret_val;
+}
+
+
+static gsize
+photos_gegl_buffer_loader_eat_header (PhotosGeglBufferLoader *self, const guchar *buf, gsize count, GError
**error)
+{
+ gsize n_bytes_to_eat;
+ gsize ret_val = 0;
+
+ g_return_val_if_fail ((gssize) self->header_buf_offset < SNIFF_BUFFER_SIZE, 0);
+
+ n_bytes_to_eat = MIN (SNIFF_BUFFER_SIZE - self->header_buf_offset, count);
+ memcpy (self->header_buf + self->header_buf_offset, buf, n_bytes_to_eat);
+
+ self->header_buf_offset += n_bytes_to_eat;
+ g_return_val_if_fail (self->header_buf_offset <= SNIFF_BUFFER_SIZE, 0);
+
+ if (self->header_buf_offset == SNIFF_BUFFER_SIZE)
+ {
+ if (!photos_gegl_buffer_loader_load_codec (self, NULL, error))
+ goto out;
+ }
+ else
+ {
+ g_return_val_if_fail (n_bytes_to_eat == count, 0);
+ }
+
+ ret_val = n_bytes_to_eat;
+
+ out:
+ return ret_val;
+}
+
+
+static void
+photos_gegl_buffer_loader_dispose (GObject *object)
+{
+ PhotosGeglBufferLoader *self = PHOTOS_GEGL_BUFFER_LOADER (object);
+
+ g_clear_object (&self->file);
+ g_clear_object (&self->codec);
+
+ G_OBJECT_CLASS (photos_gegl_buffer_loader_parent_class)->dispose (object);
+}
+
+
+static void
+photos_gegl_buffer_loader_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+ PhotosGeglBufferLoader *self = PHOTOS_GEGL_BUFFER_LOADER (object);
+
+ switch (prop_id)
+ {
+ case PROP_BUFFER:
+ {
+ GeglBuffer *buffer;
+
+ buffer = photos_gegl_buffer_loader_get_buffer (self);
+ g_value_set_object (value, buffer);
+ break;
+ }
+
+ case PROP_FILE:
+ g_value_set_object (value, self->file);
+ break;
+
+ case PROP_HEIGHT:
+ g_value_set_int (value, self->height);
+ break;
+
+ case PROP_KEEP_ASPECT_RATIO:
+ g_value_set_boolean (value, self->keep_aspect_ratio);
+ break;
+
+ case PROP_WIDTH:
+ g_value_set_int (value, self->width);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+photos_gegl_buffer_loader_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec
*pspec)
+{
+ PhotosGeglBufferLoader *self = PHOTOS_GEGL_BUFFER_LOADER (object);
+
+ switch (prop_id)
+ {
+ case PROP_FILE:
+ self->file = G_FILE (g_value_dup_object (value));
+ break;
+
+ case PROP_HEIGHT:
+ self->height = g_value_get_int (value);
+ break;
+
+ case PROP_KEEP_ASPECT_RATIO:
+ self->keep_aspect_ratio = g_value_get_boolean (value);
+ break;
+
+ case PROP_WIDTH:
+ self->width = g_value_get_int (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+
+static void
+photos_gegl_buffer_loader_init (PhotosGeglBufferLoader *self)
+{
+}
+
+
+static void
+photos_gegl_buffer_loader_class_init (PhotosGeglBufferLoaderClass *class)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+ object_class->dispose = photos_gegl_buffer_loader_dispose;
+ object_class->get_property = photos_gegl_buffer_loader_get_property;
+ object_class->set_property = photos_gegl_buffer_loader_set_property;
+
+ g_object_class_install_property (object_class,
+ PROP_BUFFER,
+ g_param_spec_object ("buffer",
+ "Buffer",
+ "The GeglBuffer being loaded",
+ GEGL_TYPE_BUFFER,
+ G_PARAM_READABLE
+ | G_PARAM_STATIC_STRINGS));
+
+ 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_CONSTRUCT_ONLY
+ | G_PARAM_READWRITE
+ | G_PARAM_STATIC_STRINGS));
+
+ 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_CONSTRUCT_ONLY
+ | G_PARAM_READWRITE
+ | G_PARAM_STATIC_STRINGS));
+
+ g_object_class_install_property (object_class,
+ PROP_KEEP_ASPECT_RATIO,
+ g_param_spec_boolean ("keep-aspect-ratio",
+ "Keep aspect ratio",
+ "Whether to keep the aspect ratio of the GeglBuffer
when "
+ "scaling, or not",
+ TRUE,
+ G_PARAM_CONSTRUCT_ONLY
+ | G_PARAM_READWRITE
+ | G_PARAM_STATIC_STRINGS));
+
+ 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_CONSTRUCT_ONLY
+ | G_PARAM_READWRITE
+ | G_PARAM_STATIC_STRINGS));
+
+ signals[SIZE_PREPARED] = g_signal_new ("size-prepared",
+ G_TYPE_FROM_CLASS (class),
+ G_SIGNAL_RUN_LAST,
+ 0,
+ NULL, /* accumulator */
+ NULL, /* accu_data */
+ _photos_marshal_VOID__UINT_UINT,
+ G_TYPE_NONE,
+ 2,
+ G_TYPE_UINT,
+ G_TYPE_UINT);
+}
+
+
+GeglBuffer *
+photos_gegl_buffer_loader_get_buffer (PhotosGeglBufferLoader *self)
+{
+ GeglBuffer *ret_val = NULL;
+
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), NULL);
+
+ if (self->codec == NULL)
+ goto out;
+
+ ret_val = photos_gegl_buffer_codec_get_buffer (self->codec);
+
+ out:
+ return ret_val;
+}
+
+
+GFile *
+photos_gegl_buffer_loader_get_file (PhotosGeglBufferLoader *self)
+{
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), NULL);
+ return self->file;
+}
+
+
+gint
+photos_gegl_buffer_loader_get_height (PhotosGeglBufferLoader *self)
+{
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), -1);
+ return self->height;
+}
+
+
+gboolean
+photos_gegl_buffer_loader_get_keep_aspect_ratio (PhotosGeglBufferLoader *self)
+{
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), FALSE);
+ return self->keep_aspect_ratio;
+}
+
+
+gint
+photos_gegl_buffer_loader_get_width (PhotosGeglBufferLoader *self)
+{
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), -1);
+ return self->width;
+}
+
+
+gboolean
+photos_gegl_buffer_loader_close (PhotosGeglBufferLoader *self, GError **error)
+{
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), FALSE);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+ if (self->closed)
+ goto out;
+
+ if (self->codec == NULL)
+ {
+ if (!photos_gegl_buffer_loader_load_codec (self, NULL, error))
+ goto out;
+ }
+
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_CODEC (self->codec), FALSE);
+
+ if (!photos_gegl_buffer_codec_load_stop (self->codec, error))
+ goto out;
+
+ self->closed = TRUE;
+
+ out:
+ return self->closed;
+}
+
+
+gboolean
+photos_gegl_buffer_loader_write_bytes (PhotosGeglBufferLoader *self,
+ GBytes *bytes,
+ GCancellable *cancellable,
+ GError **error)
+{
+ gboolean ret_val = FALSE;
+ gsize count;
+ const guchar *data;
+
+ g_return_val_if_fail (PHOTOS_IS_GEGL_BUFFER_LOADER (self), FALSE);
+ g_return_val_if_fail (bytes != NULL, FALSE);
+ g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), FALSE);
+ g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+ data = (const guchar *) g_bytes_get_data (bytes, &count);
+ g_return_val_if_fail (data != NULL, FALSE);
+ g_return_val_if_fail (count > 0, FALSE);
+
+ g_return_val_if_fail (!self->closed, FALSE);
+
+ if (self->codec == NULL)
+ {
+ gssize eaten;
+
+ eaten = photos_gegl_buffer_loader_eat_header (self, data, count, error);
+ if (eaten == 0)
+ goto out;
+
+ count -= eaten;
+ data += eaten;
+ }
+
+ g_return_val_if_fail (count == 0 || self->codec != NULL, FALSE);
+
+ if (count > 0)
+ {
+ if (!photos_gegl_buffer_codec_load_increment (self->codec, data, count, error))
+ goto out;
+ }
+
+ ret_val = TRUE;
+
+ out:
+ return ret_val;
+}
diff --git a/src/photos-gegl-buffer-loader.h b/src/photos-gegl-buffer-loader.h
new file mode 100644
index 00000000..1e694dad
--- /dev/null
+++ b/src/photos-gegl-buffer-loader.h
@@ -0,0 +1,59 @@
+/*
+ * 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_LOADER_H
+#define PHOTOS_GEGL_BUFFER_LOADER_H
+
+#include <gegl.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_GEGL_BUFFER_LOADER (photos_gegl_buffer_loader_get_type ())
+G_DECLARE_FINAL_TYPE (PhotosGeglBufferLoader,
+ photos_gegl_buffer_loader,
+ PHOTOS,
+ GEGL_BUFFER_LOADER,
+ GObject);
+
+GeglBuffer *photos_gegl_buffer_loader_get_buffer (PhotosGeglBufferLoader *self);
+
+GFile *photos_gegl_buffer_loader_get_file (PhotosGeglBufferLoader *self);
+
+gint photos_gegl_buffer_loader_get_height (PhotosGeglBufferLoader *self);
+
+gboolean photos_gegl_buffer_loader_get_keep_aspect_ratio (PhotosGeglBufferLoader *self);
+
+gint photos_gegl_buffer_loader_get_width (PhotosGeglBufferLoader *self);
+
+gboolean photos_gegl_buffer_loader_close (PhotosGeglBufferLoader *self,
+ GError **error);
+
+gboolean photos_gegl_buffer_loader_write_bytes (PhotosGeglBufferLoader *self,
+ GBytes *bytes,
+ GCancellable *cancellable,
+ GError **error);
+
+G_END_DECLS
+
+#endif /* PHOTOS_GEGL_BUFFER_LOADER_H */
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