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PIKApp/libpika/pikaimagemetadata-save.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-2000 Peter Mattis and Spencer Kimball
*
* pikaimagemetadata-save.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 const gchar * pika_fix_xmp_tag (const gchar *tag);
static void pika_image_metadata_copy_tag (GExiv2Metadata *src,
GExiv2Metadata *dest,
const gchar *tag);
static gint pika_natural_sort_compare (gconstpointer left,
gconstpointer right);
static GList* pika_image_metadata_convert_tags_to_list (gchar **xmp_tags);
static gboolean pika_image_metadata_get_xmp_struct_type (const gchar *tag,
GExiv2StructureType *struct_type);
static gboolean pika_image_metadata_exclude_metadata (GList *exclude_list,
gchar *tag);
static GList* pika_image_metadata_set_xmp_structs (GList *xmp_list,
GExiv2Metadata *metadata);
/* public functions */
/**
* pika_image_metadata_save_prepare:
* @image: The original image
* @mime_type: The saved file's mime-type
* @suggested_flags: Suggested default values for the @flags passed to
* pika_image_metadata_save_finish()
*
* Gets the image metadata for saving it using
* pika_image_metadata_save_finish().
*
* The @suggested_flags are determined from what kind of metadata
* (Exif, XMP, ...) is actually present in the image and the preferences
* for metadata exporting.
* The calling application may still update @available_flags, for
* instance to follow the settings from a previous export in the same
* session, or a previous export of the same image. But it should not
* override the preferences without a good reason since it is a data
* leak.
*
* The suggested value for %PIKA_METADATA_SAVE_THUMBNAIL is determined by
* whether there was a thumbnail in the previously imported image.
*
* Returns: (transfer full): The image's metadata, prepared for saving.
*
* Since: 2.10
*/
PikaMetadata *
pika_image_metadata_save_prepare (PikaImage *image,
const gchar *mime_type,
PikaMetadataSaveFlags *suggested_flags)
{
PikaMetadata *metadata;
GError *error = NULL;
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
g_return_val_if_fail (mime_type != NULL, NULL);
g_return_val_if_fail (suggested_flags != NULL, NULL);
*suggested_flags = PIKA_METADATA_SAVE_ALL;
metadata = pika_image_get_metadata (image);
if (metadata)
{
GDateTime *datetime;
PikaParasite *comment_parasite;
gchar *comment = NULL;
gint image_width;
gint image_height;
gdouble xres;
gdouble yres;
gchar buffer[32];
gchar *datetime_buf = NULL;
GExiv2Metadata *g2metadata = GEXIV2_METADATA (metadata);
image_width = pika_image_get_width (image);
image_height = pika_image_get_height (image);
datetime = g_date_time_new_now_local ();
comment_parasite = pika_image_get_parasite (image, "pika-comment");
if (comment_parasite)
{
guint32 parasite_size;
comment = (gchar *) pika_parasite_get_data (comment_parasite, &parasite_size);
comment = g_strndup (comment, parasite_size);
pika_parasite_free (comment_parasite);
}
/* Exif */
if (! pika_export_exif () ||
! gexiv2_metadata_has_exif (g2metadata))
*suggested_flags &= ~PIKA_METADATA_SAVE_EXIF;
if (comment)
{
gexiv2_metadata_try_set_tag_string (g2metadata,
"Exif.Photo.UserComment",
comment, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Photo.UserComment", error->message);
g_clear_error (&error);
}
gexiv2_metadata_try_set_tag_string (g2metadata,
"Exif.Image.ImageDescription",
comment, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Image.ImageDescription", error->message);
g_clear_error (&error);
}
}
g_snprintf (buffer, sizeof (buffer),
"%d:%02d:%02d %02d:%02d:%02d",
g_date_time_get_year (datetime),
g_date_time_get_month (datetime),
g_date_time_get_day_of_month (datetime),
g_date_time_get_hour (datetime),
g_date_time_get_minute (datetime),
g_date_time_get_second (datetime));
gexiv2_metadata_try_set_tag_string (g2metadata,
"Exif.Image.DateTime",
buffer, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Image.DateTime", error->message);
g_clear_error (&error);
}
gexiv2_metadata_try_set_tag_string (g2metadata,
"Exif.Image.Software",
PACKAGE_STRING, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Image.Software", error->message);
g_clear_error (&error);
}
pika_metadata_set_pixel_size (metadata,
image_width, image_height);
pika_image_get_resolution (image, &xres, &yres);
pika_metadata_set_resolution (metadata, xres, yres,
pika_image_get_unit (image));
/* XMP */
if (! pika_export_xmp () ||
! gexiv2_metadata_has_xmp (g2metadata))
*suggested_flags &= ~PIKA_METADATA_SAVE_XMP;
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.dc.Format",
mime_type, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.dc.Format", error->message);
g_clear_error (&error);
}
/* XMP uses datetime in ISO 8601 format */
datetime_buf = g_date_time_format (datetime, "%Y:%m:%dT%T\%:z");
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.xmp.ModifyDate",
datetime_buf, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.xmp.ModifyDate", error->message);
g_clear_error (&error);
}
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.xmp.MetadataDate",
datetime_buf, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.xmp.MetadataDate", error->message);
g_clear_error (&error);
}
if (! g_strcmp0 (mime_type, "image/tiff"))
{
/* TIFF specific XMP data */
g_snprintf (buffer, sizeof (buffer), "%d", image_width);
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.tiff.ImageWidth",
buffer, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.tiff.ImageWidth", error->message);
g_clear_error (&error);
}
g_snprintf (buffer, sizeof (buffer), "%d", image_height);
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.tiff.ImageLength",
buffer, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.tiff.ImageLength", error->message);
g_clear_error (&error);
}
gexiv2_metadata_try_set_tag_string (g2metadata,
"Xmp.tiff.DateTime",
datetime_buf, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.tiff.DateTime", error->message);
g_clear_error (&error);
}
}
/* IPTC */
if (! pika_export_iptc () ||
! gexiv2_metadata_has_iptc (g2metadata))
*suggested_flags &= ~PIKA_METADATA_SAVE_IPTC;
g_free (datetime_buf);
g_date_time_unref (datetime);
g_clear_pointer (&comment, g_free);
/* EXIF Thumbnail */
if (pika_export_thumbnail () && gexiv2_metadata_has_exif (g2metadata))
{
gchar *value;
/* Check a required tag for a thumbnail to be present. */
value = gexiv2_metadata_try_get_tag_string (g2metadata,
"Exif.Thumbnail.ImageLength",
NULL);
if (! value)
{
*suggested_flags &= ~PIKA_METADATA_SAVE_THUMBNAIL;
}
else
{
g_free (value);
}
}
else
{
*suggested_flags &= ~PIKA_METADATA_SAVE_THUMBNAIL;
}
}
else
{
/* At least initialize the returned flags with preferences defaults */
if (! pika_export_exif ())
*suggested_flags &= ~PIKA_METADATA_SAVE_EXIF;
if (! pika_export_xmp ())
*suggested_flags &= ~PIKA_METADATA_SAVE_XMP;
if (! pika_export_iptc ())
*suggested_flags &= ~PIKA_METADATA_SAVE_IPTC;
if (! pika_export_thumbnail ())
*suggested_flags &= ~PIKA_METADATA_SAVE_THUMBNAIL;
}
/* Color profile */
if (! pika_export_color_profile ())
*suggested_flags &= ~PIKA_METADATA_SAVE_COLOR_PROFILE;
/* Comment */
if (! pika_export_comment ())
*suggested_flags &= ~PIKA_METADATA_SAVE_COMMENT;
return metadata;
}
static const gchar *
pika_fix_xmp_tag (const gchar *tag)
{
gchar *substring;
/* Due to problems using /Iptc4xmpExt namespace (/iptcExt is used
* instead by Exiv2) we replace all occurrences with /iptcExt which
* is valid but less common. Not doing so would cause saving xmp
* metadata to fail. This has to be done after getting the values
* from the source metadata since that source uses the original
* tag names and would otherwise return NULL as value.
* /Iptc4xmpExt length = 12
* /iptcExt length = 8
*/
substring = strstr (tag, "/Iptc4xmpExt");
while (substring)
{
gint len_tag = strlen (tag);
gint len_end;
len_end = len_tag - (substring - tag) - 12;
strncpy (substring, "/iptcExt", 8);
substring += 8;
/* Using memmove: we have overlapping source and dest */
memmove (substring, substring+4, len_end);
substring[len_end] = '\0';
g_debug ("Fixed tag value: %s", tag);
/* Multiple occurrences are possible: e.g.:
* Xmp.iptcExt.ImageRegion[3]/Iptc4xmpExt:RegionBoundary/Iptc4xmpExt:rbVertices[1]/Iptc4xmpExt:rbX
*/
substring = strstr (tag, "/Iptc4xmpExt");
}
return tag;
}
static void
pika_image_metadata_copy_tag (GExiv2Metadata *src,
GExiv2Metadata *dest,
const gchar *tag)
{
gchar **values = gexiv2_metadata_try_get_tag_multiple (src, tag, NULL);
GError *error = NULL;
if (values)
{
gchar *temp_tag;
/* Xmp always seems to return multiple values */
if (g_str_has_prefix (tag, "Xmp."))
temp_tag = (gchar *) pika_fix_xmp_tag (g_strdup (tag));
else
temp_tag = g_strdup (tag);
g_debug ("Copy multi tag %s, first value: %s", temp_tag, values[0]);
gexiv2_metadata_try_set_tag_multiple (dest, temp_tag,
(const gchar **) values,
&error);
if (error)
{
g_warning ("%s: failed to set multiple metadata '%s': %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
g_free (temp_tag);
g_strfreev (values);
}
else
{
gchar *value = gexiv2_metadata_try_get_tag_string (src, tag, &error);
if (value)
{
g_debug ("Copy tag %s, value: %s", tag, value);
gexiv2_metadata_try_set_tag_string (dest, tag, value, &error);
if (error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
g_free (value);
}
else if (error)
{
g_warning ("%s: failed to get metadata '%s': %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
}
}
static gint
pika_natural_sort_compare (gconstpointer left,
gconstpointer right)
{
gint compare;
gchar *left_key = g_utf8_collate_key_for_filename ((gchar *) left, -1);
gchar *right_key = g_utf8_collate_key_for_filename ((gchar *) right, -1);
compare = g_strcmp0 (left_key, right_key);
g_free (left_key);
g_free (right_key);
return compare;
}
static GList*
pika_image_metadata_convert_tags_to_list (gchar **xmp_tags)
{
GList *list = NULL;
gint i;
for (i = 0; xmp_tags[i] != NULL; i++)
{
g_debug ("Tag: %s, tag type: %s", xmp_tags[i], gexiv2_metadata_try_get_tag_type (xmp_tags[i], NULL));
list = g_list_prepend (list, xmp_tags[i]);
}
return list;
}
static gboolean
pika_image_metadata_get_xmp_struct_type (const gchar *tag,
GExiv2StructureType *struct_type)
{
GError *error = NULL;
g_debug ("Struct type for tag: %s, type: %s", tag, gexiv2_metadata_try_get_tag_type (tag, NULL));
if (! g_strcmp0 (gexiv2_metadata_try_get_tag_type (tag, &error), "XmpSeq"))
{
*struct_type = GEXIV2_STRUCTURE_XA_SEQ;
return TRUE;
}
if (error)
{
g_debug ("%s: failed to get type of tag '%s': %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
*struct_type = GEXIV2_STRUCTURE_XA_NONE;
return FALSE;
}
*struct_type = GEXIV2_STRUCTURE_XA_BAG;
return TRUE;
}
static gboolean
pika_image_metadata_exclude_metadata (GList *exclude_list,
gchar *tag)
{
GList *list;
for (list = exclude_list; list != NULL; list = list->next)
{
if (strstr (tag, (gchar *) list->data))
{
return TRUE;
}
}
return FALSE;
}
static GList*
pika_image_metadata_set_xmp_structs (GList *xmp_list,
GExiv2Metadata *metadata)
{
GList *list;
GList *exclude = NULL;
gchar *prev_one = NULL;
gchar *prev_two = NULL;
for (list = xmp_list; list != NULL; list = list->next)
{
gchar **tag_split;
/*
* Most tags with structs have only one struct part, like:
* Xmp.xmpMM.History[1]...
* However there are also Xmp tags that have two
* structs in one tag, e.g.:
* Xmp.crs.GradientBasedCorrections[1]/crs:CorrectionMasks[1]...
*/
tag_split = g_strsplit ((gchar *) list->data, "[1]", 3);
/* Check if there are at least two parts */
if (tag_split && tag_split[1])
{
GError *error = NULL;
if (strstr (tag_split[0], "["))
{
gchar **splits = NULL;
gint last_part = -1;
/* Handle things like:
* Xmp.iptcExt.ImageRegion[3]/Iptc4xmpExt:RegionBoundary/Iptc4xmpExt:rbVertices[1]/Iptc4xmpExt:rbX,
* where rbVertices only appears in ImageRegion[3].
* We only want the part starting with the last '/'.
*/
splits = g_strsplit (tag_split[0], "/", 0);
if (splits)
{
GExiv2StructureType type;
gchar *tag_inner = NULL;
for (int i = 0; splits[i] != NULL; i++)
{
last_part = i;
}
tag_inner = g_strconcat ("/", splits[last_part], NULL);
if (pika_image_metadata_get_xmp_struct_type (pika_fix_xmp_tag (tag_inner), &type))
{
gexiv2_metadata_try_set_xmp_tag_struct (GEXIV2_METADATA (metadata),
tag_inner, type, &error);
if (error)
{
g_printerr ("%s: failed to set XMP struct '%s': %s\n",
G_STRFUNC, tag_inner, error->message);
g_clear_error (&error);
}
}
else
{
/* Add to exclude list */
if (! g_list_find_custom (exclude, tag_inner, (GCompareFunc) g_strcmp0))
{
g_debug ("Adding unsupported tag to exclude list: %s", tag_inner);
exclude = g_list_prepend (exclude, g_strdup (tag_inner));
}
}
g_free (tag_inner);
}
g_strfreev (splits);
}
else if (! prev_one || strcmp (tag_split[0], prev_one) != 0)
{
GExiv2StructureType type;
g_free (prev_one);
prev_one = g_strdup (tag_split[0]);
if (pika_image_metadata_get_xmp_struct_type (pika_fix_xmp_tag (tag_split[0]), &type))
{
gexiv2_metadata_try_set_xmp_tag_struct (GEXIV2_METADATA (metadata),
prev_one, type, &error);
if (error)
{
g_printerr ("%s: failed to set XMP struct '%s': %s\n",
G_STRFUNC, prev_one, error->message);
g_clear_error (&error);
}
}
else
{
/* Add to exclude list */
if (! g_list_find_custom (exclude, tag_split[0], (GCompareFunc) g_strcmp0))
{
g_debug ("Adding unsupported tag to exclude list: %s", tag_split[0]);
exclude = g_list_prepend (exclude, g_strdup (tag_split[0]));
}
}
}
if (tag_split[2] && (!prev_two || strcmp (tag_split[1], prev_two) != 0))
{
gchar *second_struct;
GExiv2StructureType type;
g_free (prev_two);
prev_two = g_strdup (tag_split[1]);
second_struct = g_strdup_printf ("%s[1]%s", prev_one, pika_fix_xmp_tag(prev_two));
if (pika_image_metadata_get_xmp_struct_type (pika_fix_xmp_tag (tag_split[1]), &type))
{
gexiv2_metadata_try_set_xmp_tag_struct (GEXIV2_METADATA (metadata),
second_struct, type, &error);
if (error)
{
g_printerr ("%s: failed to set XMP struct '%s': %s\n",
G_STRFUNC, second_struct, error->message);
g_clear_error (&error);
}
}
else
{
/* Add to exclude list */
if (! g_list_find_custom (exclude, tag_split[1], (GCompareFunc) g_strcmp0))
{
g_debug ("Adding unsupported tag to exclude list: %s", tag_split[1]);
exclude = g_list_prepend (exclude, g_strdup (tag_split[1]));
}
}
g_free (second_struct);
}
}
g_strfreev (tag_split);
}
g_free (prev_one);
g_free (prev_two);
return exclude;
}
/**
* pika_image_metadata_save_filter:
* @image: The actually saved image
* @mime_type: The saved file's mime-type
* @metadata: The metadata to export
* @flags: Flags to specify what of the metadata to save
* @file: The file @image was saved to or NULL if file was not saved yet
* @error: Return location for error message
*
* Filters the @metadata retrieved from the image with
* pika_image_metadata_save_prepare(),
* taking into account the passed @flags.
*
* Note that the @image passed to this function might be different
* from the image passed to pika_image_metadata_save_prepare(), due
* to whatever file export conversion happened in the meantime
*
* This is an alternative to pika_image_metadata_save_finish when you
* want to save metadata yourself and you need only filtering processing.
*
* Returns: (transfer full): Filtered metadata or NULL in case of failure.
*
* Use g_object_unref() when returned metadata are no longer needed
*
* Since: 3.0
*/
PikaMetadata *
pika_image_metadata_save_filter (PikaImage *image,
const gchar *mime_type,
PikaMetadata *metadata,
PikaMetadataSaveFlags flags,
GFile *file,
GError **error)
{
PikaMetadata *new_metadata;
GExiv2Metadata *new_g2metadata;
/* Error for cases where we have full control, such as metadata tags
* and contents. So we don't propagate these in @error (for things out
* of our control, such as read or write errors), but we use them as
* internal warning for bugs.
*/
GError *code_error = NULL;
gboolean support_exif;
gboolean support_xmp;
gboolean support_iptc;
gint i;
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
g_return_val_if_fail (mime_type != NULL, NULL);
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
if (! (flags & (PIKA_METADATA_SAVE_EXIF |
PIKA_METADATA_SAVE_XMP |
PIKA_METADATA_SAVE_IPTC |
PIKA_METADATA_SAVE_THUMBNAIL)))
return NULL;
if (file)
{
/* read metadata from saved file */
new_metadata = pika_metadata_load_from_file (file, error);
}
else
{
new_metadata = pika_metadata_new ();
}
if (! new_metadata)
return NULL;
new_g2metadata = GEXIV2_METADATA (new_metadata);
support_exif = gexiv2_metadata_get_supports_exif (new_g2metadata);
support_xmp = gexiv2_metadata_get_supports_xmp (new_g2metadata);
support_iptc = gexiv2_metadata_get_supports_iptc (new_g2metadata);
if ((flags & PIKA_METADATA_SAVE_EXIF) && support_exif)
{
gchar **exif_data = gexiv2_metadata_get_exif_tags (GEXIV2_METADATA (metadata));
for (i = 0; exif_data[i] != NULL; i++)
{
if (! gexiv2_metadata_try_has_tag (new_g2metadata, exif_data[i], NULL) &&
pika_metadata_is_tag_supported (exif_data[i], mime_type))
{
pika_image_metadata_copy_tag (GEXIV2_METADATA (metadata),
new_g2metadata,
exif_data[i]);
}
}
g_strfreev (exif_data);
}
if ((flags & PIKA_METADATA_SAVE_XMP) && support_xmp)
{
gchar **xmp_data;
struct timeval timer_usec;
gint64 timestamp_usec;
gchar ts[128];
GList *xmp_list = NULL;
GList *exclude_list = NULL;
GList *list;
gettimeofday (&timer_usec, NULL);
timestamp_usec = ((gint64) timer_usec.tv_sec) * 1000000ll +
(gint64) timer_usec.tv_usec;
g_snprintf (ts, sizeof (ts), "%" G_GINT64_FORMAT, timestamp_usec);
pika_metadata_add_xmp_history (metadata, "");
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
"Xmp.PIKA.TimeStamp",
ts, &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.PIKA.TimeStamp", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
"Xmp.xmp.CreatorTool",
N_("PIKA"), &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.xmp.CreatorTool", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
"Xmp.PIKA.Version",
PIKA_VERSION, &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.PIKA.Version", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
"Xmp.PIKA.API",
PIKA_API_VERSION, &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.PIKA.API", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (GEXIV2_METADATA (metadata),
"Xmp.PIKA.Platform",
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
"Windows",
#elif defined(__linux__)
"Linux",
#elif defined(__APPLE__) && defined(__MACH__)
"Mac OS",
#elif defined(unix) || defined(__unix__) || defined(__unix)
"Unix",
#else
"Unknown",
#endif
&code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Xmp.PIKA.Platform", code_error->message);
g_clear_error (&code_error);
}
xmp_data = gexiv2_metadata_get_xmp_tags (GEXIV2_METADATA (metadata));
xmp_list = pika_image_metadata_convert_tags_to_list (xmp_data);
xmp_list = g_list_sort (xmp_list, (GCompareFunc) pika_natural_sort_compare);
exclude_list = pika_image_metadata_set_xmp_structs (xmp_list, new_g2metadata);
for (list = xmp_list; list != NULL; list = list->next)
{
gchar *fixed = NULL;
/* Certain XMP metadata tags currently can't be saved by us until
* we get support in gexiv2 for adding new structs.
* We remove these from the exported metadata because the XMPSDK
* in exiv2 would otherwise fail to write all XMP metadata. */
fixed = (gchar *) pika_fix_xmp_tag (g_strdup ((gchar *) list->data));
if (pika_image_metadata_exclude_metadata (exclude_list, (gchar *) fixed))
{
g_warning ("Unsupported XMP metadata tag (not saved): %s", fixed);
}
else if (! gexiv2_metadata_try_has_tag (new_g2metadata, (gchar *) list->data, NULL) &&
pika_metadata_is_tag_supported ((gchar *) list->data, mime_type))
{
pika_image_metadata_copy_tag (GEXIV2_METADATA (metadata),
new_g2metadata,
(gchar *) list->data);
}
else
g_debug ("Ignored tag: %s", (gchar *) list->data);
g_free (fixed);
}
g_list_free_full (exclude_list, g_free);
g_list_free (xmp_list);
g_strfreev (xmp_data);
}
if ((flags & PIKA_METADATA_SAVE_IPTC) && support_iptc)
{
gchar **iptc_data = gexiv2_metadata_get_iptc_tags (GEXIV2_METADATA (metadata));
for (i = 0; iptc_data[i] != NULL; i++)
{
if (! gexiv2_metadata_try_has_tag (new_g2metadata, iptc_data[i], NULL) &&
pika_metadata_is_tag_supported (iptc_data[i], mime_type))
{
pika_image_metadata_copy_tag (GEXIV2_METADATA (metadata),
new_g2metadata,
iptc_data[i]);
}
}
g_strfreev (iptc_data);
}
if (flags & PIKA_METADATA_SAVE_THUMBNAIL && support_exif)
{
GdkPixbuf *thumb_pixbuf;
gchar *thumb_buffer;
gint image_width;
gint image_height;
gsize count;
gint thumbw;
gint thumbh;
#define EXIF_THUMBNAIL_SIZE 256
image_width = pika_image_get_width (image);
image_height = pika_image_get_height (image);
if (image_width > image_height)
{
thumbw = EXIF_THUMBNAIL_SIZE;
thumbh = EXIF_THUMBNAIL_SIZE * image_height / image_width;
}
else
{
thumbh = EXIF_THUMBNAIL_SIZE;
thumbw = EXIF_THUMBNAIL_SIZE * image_width / image_height;
}
/* TODO: currently our exported thumbnails are always RGB because
* GdkPixbuf only supports RGB so far. While RGB thumbnail may make sense,
* even for CMYK images or other color spaces, grayscale images would be
* better served with a grayscale thumbnail too.
*/
thumb_pixbuf = pika_image_get_thumbnail (image, thumbw, thumbh,
PIKA_PIXBUF_KEEP_ALPHA);
if (gdk_pixbuf_save_to_buffer (thumb_pixbuf, &thumb_buffer, &count,
"jpeg", NULL,
"quality", "75",
NULL))
{
gchar buffer[32];
gexiv2_metadata_try_set_exif_thumbnail_from_buffer (new_g2metadata,
(guchar *) thumb_buffer,
count, &code_error);
if (code_error)
{
g_warning ("%s: failed to set Exif thumbnail: %s\n",
G_STRFUNC, code_error->message);
g_clear_error (&code_error);
}
g_snprintf (buffer, sizeof (buffer), "%d", thumbw);
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.ImageWidth",
buffer, &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.ImageWidth", code_error->message);
g_clear_error (&code_error);
}
g_snprintf (buffer, sizeof (buffer), "%d", thumbh);
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.ImageLength",
buffer, &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.ImageLength", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.BitsPerSample",
"8 8 8", &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.BitsPerSample", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.SamplesPerPixel",
"3", &code_error);
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.SamplesPerPixel", code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.PhotometricInterpretation",
"6", &code_error); /* old jpeg */
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.PhotometricInterpretation",
code_error->message);
g_clear_error (&code_error);
}
gexiv2_metadata_try_set_tag_string (new_g2metadata,
"Exif.Thumbnail.NewSubfileType",
"1", &code_error); /* reduced resolution image */
if (code_error)
{
g_warning ("%s: failed to set metadata '%s': %s\n",
G_STRFUNC, "Exif.Thumbnail.NewSubfileType", code_error->message);
g_clear_error (&code_error);
}
g_free (thumb_buffer);
}
g_object_unref (thumb_pixbuf);
}
else
{
/* Remove Thumbnail */
gexiv2_metadata_try_erase_exif_thumbnail (new_g2metadata, &code_error);
if (code_error)
{
g_warning ("%s: failed to erase EXIF thumbnail: %s\n",
G_STRFUNC, code_error->message);
g_clear_error (&code_error);
}
}
if (flags & PIKA_METADATA_SAVE_COLOR_PROFILE)
{
/* nothing to do, but if we ever need to modify metadata based
* on the exported color profile, this is probably the place to
* add it
*/
}
if (flags & PIKA_METADATA_SAVE_COMMENT)
{
/* nothing to do, blah blah */
}
return new_metadata;
}
/**
* pika_image_metadata_save_finish:
* @image: The actually saved image
* @mime_type: The saved file's mime-type
* @metadata: The metadata to write to @file
* @flags: Flags to specify what of the metadata to save
* @file: The file @image was saved to
* @error: Return location for error message
*
* Saves the @metadata retrieved from the image with
* pika_image_metadata_save_prepare() to @file, taking into account
* the passed @flags.
*
* Note that the @image passed to this function might be different
* from the image passed to pika_image_metadata_save_prepare(), due
* to whatever file export conversion happened in the meantime
*
* Returns: Whether the save was successful.
*
* Since: 2.10
*/
gboolean
pika_image_metadata_save_finish (PikaImage *image,
const gchar *mime_type,
PikaMetadata *metadata,
PikaMetadataSaveFlags flags,
GFile *file,
GError **error)
{
PikaMetadata *new_metadata;
gboolean success = FALSE;
g_return_val_if_fail (PIKA_IS_IMAGE (image), FALSE);
g_return_val_if_fail (mime_type != NULL, FALSE);
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
g_return_val_if_fail (G_IS_FILE (file), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (! (flags & (PIKA_METADATA_SAVE_EXIF |
PIKA_METADATA_SAVE_XMP |
PIKA_METADATA_SAVE_IPTC |
PIKA_METADATA_SAVE_THUMBNAIL)))
return TRUE;
new_metadata = pika_image_metadata_save_filter (image, mime_type, metadata,
flags, file, error);
if (! new_metadata)
{
return FALSE;
}
success = pika_metadata_save_to_file (new_metadata, file, error);
g_object_unref (new_metadata);
return success;
}
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