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PIKApp/libpika/pikaimagemetadata.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-2000 Peter Mattis and Spencer Kimball
*
* pikaimagemetadata.c
*
* 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 3 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <sys/time.h>
#include <gexiv2/gexiv2.h>
#include "pika.h"
#include "pikaimagemetadata.h"
#include "libpika-intl.h"
static gchar * pika_image_metadata_interpret_comment (gchar *comment);
static void pika_image_metadata_rotate (PikaImage *image,
GExiv2Orientation orientation);
/* public functions */
/**
* pika_image_metadata_load_prepare:
* @image: The image
* @mime_type: The loaded file's mime-type
* @file: The file to load the metadata from
* @error: Return location for error
*
* Loads and returns metadata from @file to be passed into
* pika_image_metadata_load_finish().
*
* Returns: (transfer full): The file's metadata.
*
* Since: 2.10
*/
PikaMetadata *
pika_image_metadata_load_prepare (PikaImage *image,
const gchar *mime_type,
GFile *file,
GError **error)
{
PikaMetadata *metadata;
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
g_return_val_if_fail (mime_type != NULL, NULL);
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
metadata = pika_metadata_load_from_file (file, error);
return metadata;
}
static gchar *
pika_image_metadata_interpret_comment (gchar *comment)
{
/* Exiv2 can return unwanted text at the start of a comment
* taken from Exif.Photo.UserComment since 0.27.3.
* Let's remove that part and return NULL if there
* is nothing else left as comment. */
if (comment)
{
if (g_str_has_prefix (comment, "charset=Ascii "))
{
gchar *real_comment;
/* Skip "charset=Ascii " (length 14) to find the real comment */
real_comment = g_strdup (comment + 14);
g_free (comment);
comment = real_comment;
}
if (comment[0] == '\0')
{
/* Removing an empty comment.*/
g_free (comment);
return NULL;
}
}
return comment;
}
/**
* pika_image_metadata_load_finish:
* @image: The image
* @mime_type: The loaded file's mime-type
* @metadata: The metadata to set on the image
* @flags: Flags to specify what of the metadata to apply to the image
*
* Applies the @metadata previously loaded with
* pika_image_metadata_load_prepare() to the image, taking into account
* the passed @flags.
*
* Since: 3.0
*/
void
pika_image_metadata_load_finish (PikaImage *image,
const gchar *mime_type,
PikaMetadata *metadata,
PikaMetadataLoadFlags flags)
{
g_return_if_fail (PIKA_IS_IMAGE (image));
g_return_if_fail (GEXIV2_IS_METADATA (metadata));
if (flags & PIKA_METADATA_LOAD_COMMENT)
{
gchar *comment;
GError *error = NULL;
comment = gexiv2_metadata_try_get_tag_interpreted_string (GEXIV2_METADATA (metadata),
"Exif.Photo.UserComment",
&error);
if (error)
{
/* XXX. Should this be rather a user-facing error? */
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, "Exif.Photo.UserComment", error->message);
g_clear_error (&error);
}
else if (comment)
{
comment = pika_image_metadata_interpret_comment (comment);
}
if (! comment)
{
comment = gexiv2_metadata_try_get_tag_interpreted_string (GEXIV2_METADATA (metadata),
"Exif.Image.ImageDescription",
&error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, "Exif.Image.ImageDescription", error->message);
g_clear_error (&error);
}
}
if (comment)
{
PikaParasite *parasite;
parasite = pika_parasite_new ("pika-comment",
PIKA_PARASITE_PERSISTENT,
strlen (comment) + 1,
comment);
g_free (comment);
pika_image_attach_parasite (image, parasite);
pika_parasite_free (parasite);
}
}
if (flags & PIKA_METADATA_LOAD_RESOLUTION)
{
gdouble xres;
gdouble yres;
PikaUnit unit;
if (pika_metadata_get_resolution (metadata, &xres, &yres, &unit))
{
pika_image_set_resolution (image, xres, yres);
pika_image_set_unit (image, unit);
}
}
if (! (flags & PIKA_METADATA_LOAD_ORIENTATION))
{
gexiv2_metadata_try_set_orientation (GEXIV2_METADATA (metadata),
GEXIV2_ORIENTATION_NORMAL,
NULL);
}
if (flags & PIKA_METADATA_LOAD_COLORSPACE)
{
PikaColorProfile *profile = pika_image_get_color_profile (image);
/* only look for colorspace information from metadata if the
* image didn't contain an embedded color profile
*/
if (! profile)
{
PikaMetadataColorspace colorspace;
colorspace = pika_metadata_get_colorspace (metadata);
switch (colorspace)
{
case PIKA_METADATA_COLORSPACE_UNSPECIFIED:
case PIKA_METADATA_COLORSPACE_UNCALIBRATED:
case PIKA_METADATA_COLORSPACE_SRGB:
/* use sRGB, a NULL profile will do the right thing */
break;
case PIKA_METADATA_COLORSPACE_ADOBERGB:
profile = pika_color_profile_new_rgb_adobe ();
break;
}
if (profile)
pika_image_set_color_profile (image, profile);
}
if (profile)
g_object_unref (profile);
}
pika_image_set_metadata (image, metadata);
}
/**
* pika_image_metadata_load_thumbnail:
* @file: A #GFile image
* @error: Return location for error message
*
* Retrieves a thumbnail from metadata if present.
*
* Returns: (transfer none) (nullable): a #PikaImage of the @file thumbnail.
*
* Since: 2.10
*/
PikaImage *
pika_image_metadata_load_thumbnail (GFile *file,
GError **error)
{
PikaMetadata *metadata;
GInputStream *input_stream;
GdkPixbuf *pixbuf;
guint8 *thumbnail_buffer;
gint thumbnail_size;
PikaImage *image = NULL;
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
metadata = pika_metadata_load_from_file (file, error);
if (! metadata)
return NULL;
if (! gexiv2_metadata_get_exif_thumbnail (GEXIV2_METADATA (metadata),
&thumbnail_buffer,
&thumbnail_size))
{
g_object_unref (metadata);
return NULL;
}
input_stream = g_memory_input_stream_new_from_data (thumbnail_buffer,
thumbnail_size,
(GDestroyNotify) g_free);
pixbuf = gdk_pixbuf_new_from_stream (input_stream, NULL, error);
g_object_unref (input_stream);
if (pixbuf)
{
PikaLayer *layer;
image = pika_image_new (gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
PIKA_RGB);
pika_image_undo_disable (image);
layer = pika_layer_new_from_pixbuf (image, _("Background"),
pixbuf,
100.0,
pika_image_get_default_new_layer_mode (image),
0.0, 0.0);
g_object_unref (pixbuf);
pika_image_insert_layer (image, layer, NULL, 0);
pika_image_metadata_rotate (image,
gexiv2_metadata_try_get_orientation (GEXIV2_METADATA (metadata), NULL));
}
g_object_unref (metadata);
return image;
}
/* private functions */
static void
pika_image_metadata_rotate (PikaImage *image,
GExiv2Orientation orientation)
{
switch (orientation)
{
case GEXIV2_ORIENTATION_UNSPECIFIED:
case GEXIV2_ORIENTATION_NORMAL: /* standard orientation, do nothing */
break;
case GEXIV2_ORIENTATION_HFLIP:
pika_image_flip (image, PIKA_ORIENTATION_HORIZONTAL);
break;
case GEXIV2_ORIENTATION_ROT_180:
pika_image_rotate (image, PIKA_ROTATE_180);
break;
case GEXIV2_ORIENTATION_VFLIP:
pika_image_flip (image, PIKA_ORIENTATION_VERTICAL);
break;
case GEXIV2_ORIENTATION_ROT_90_HFLIP: /* flipped diagonally around '\' */
pika_image_rotate (image, PIKA_ROTATE_90);
pika_image_flip (image, PIKA_ORIENTATION_HORIZONTAL);
break;
case GEXIV2_ORIENTATION_ROT_90: /* 90 CW */
pika_image_rotate (image, PIKA_ROTATE_90);
break;
case GEXIV2_ORIENTATION_ROT_90_VFLIP: /* flipped diagonally around '/' */
pika_image_rotate (image, PIKA_ROTATE_90);
pika_image_flip (image, PIKA_ORIENTATION_VERTICAL);
break;
case GEXIV2_ORIENTATION_ROT_270: /* 90 CCW */
pika_image_rotate (image, PIKA_ROTATE_270);
break;
default: /* shouldn't happen */
break;
}
}
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