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gimp/libgimpbase/gimpmetadata.c

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/* LIBGIMPBASE - The GIMP Basic Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpmetadata.c
* Copyright (C) 2013 Hartmut Kuhse <hartmutkuhse@src.gnome.org>
* Michael Natterer <mitch@gimp.org>
*
* 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
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <gio/gio.h>
#include <gexiv2/gexiv2.h>
#include "libgimpmath/gimpmath.h"
#include "gimpbasetypes.h"
#include "gimplimits.h"
#include "gimpmetadata.h"
#include "gimpunit.h"
#include "libgimp/libgimp-intl.h"
/**
* SECTION: gimpmetadata
* @title: gimpmetadata
* @short_description: Basic functions for handling #GimpMetadata objects.
* @see_also: gimp_image_metadata_load_prepare(),
* gimp_image_metadata_load_finish(),
* gimp_image_metadata_load_prepare(),
* gimp_image_metadata_load_finish().
*
* Basic functions for handling #GimpMetadata objects.
**/
static GQuark gimp_metadata_error_quark (void);
static void gimp_metadata_add (GimpMetadata *src,
GimpMetadata *dest);
static const gchar *tiff_tags[] =
{
"Xmp.tiff",
"Exif.Image.ImageWidth",
"Exif.Image.ImageLength",
"Exif.Image.BitsPerSample",
"Exif.Image.Compression",
"Exif.Image.PhotometricInterpretation",
"Exif.Image.FillOrder",
"Exif.Image.SamplesPerPixel",
"Exif.Image.StripOffsets",
"Exif.Image.RowsPerStrip",
"Exif.Image.StripByteCounts",
"Exif.Image.PlanarConfiguration"
};
static const gchar *jpeg_tags[] =
{
"Exif.Image.JPEGProc",
"Exif.Image.JPEGInterchangeFormat",
"Exif.Image.JPEGInterchangeFormatLength",
"Exif.Image.JPEGRestartInterval",
"Exif.Image.JPEGLosslessPredictors",
"Exif.Image.JPEGPointTransforms",
"Exif.Image.JPEGQTables",
"Exif.Image.JPEGDCTables",
"Exif.Image.JPEGACTables"
};
static const gchar *unsupported_tags[] =
{
"Exif.Image.SubIFDs",
"Exif.Image.ClipPath",
"Exif.Image.XClipPathUnits",
"Exif.Image.YClipPathUnits",
"Xmp.xmpMM.History",
"Exif.Image.XPTitle",
"Exif.Image.XPComment",
"Exif.Image.XPAuthor",
"Exif.Image.XPKeywords",
"Exif.Image.XPSubject",
"Exif.Image.DNGVersion",
"Exif.Image.DNGBackwardVersion",
"Exif.Iop"
};
static const guint8 minimal_exif[] =
{
0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
0x01, 0x01, 0x00, 0x5a, 0x00, 0x5a, 0x00, 0x00, 0xff, 0xe1
};
static const guint8 wilber_jpg[] =
{
0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
0x01, 0x01, 0x00, 0x5a, 0x00, 0x5a, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43,
0x00, 0x50, 0x37, 0x3c, 0x46, 0x3c, 0x32, 0x50, 0x46, 0x41, 0x46, 0x5a,
0x55, 0x50, 0x5f, 0x78, 0xc8, 0x82, 0x78, 0x6e, 0x6e, 0x78, 0xf5, 0xaf,
0xb9, 0x91, 0xc8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xdb, 0x00, 0x43, 0x01, 0x55, 0x5a,
0x5a, 0x78, 0x69, 0x78, 0xeb, 0x82, 0x82, 0xeb, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xc0, 0x00, 0x11, 0x08, 0x00, 0x10, 0x00, 0x10, 0x03,
0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xc4, 0x00,
0x16, 0x00, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x01, 0x02, 0xff, 0xc4, 0x00,
0x1e, 0x10, 0x00, 0x01, 0x05, 0x00, 0x02, 0x03, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02, 0x03, 0x11, 0x31,
0x04, 0x12, 0x51, 0x61, 0x71, 0xff, 0xc4, 0x00, 0x14, 0x01, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xff, 0xc4, 0x00, 0x14, 0x11, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11,
0x00, 0x3f, 0x00, 0x18, 0xa0, 0x0e, 0x6d, 0xbc, 0xf5, 0xca, 0xf7, 0x78,
0xb6, 0xfe, 0x3b, 0x23, 0xb2, 0x1d, 0x64, 0x68, 0xf0, 0x8a, 0x39, 0x4b,
0x74, 0x9c, 0xa5, 0x5f, 0x35, 0x8a, 0xb2, 0x7e, 0xa0, 0xff, 0xd9, 0x00
};
static const guint wilber_jpg_len = G_N_ELEMENTS (wilber_jpg);
/**
* gimp_metadata_new:
*
* Creates a new #GimpMetadata instance.
*
* Return value: The new #GimpMetadata.
*
* Since: GIMP 2.10
*/
GimpMetadata *
gimp_metadata_new (void)
{
GExiv2Metadata *metadata = NULL;
if (gexiv2_initialize ())
{
metadata = gexiv2_metadata_new ();
if (! gexiv2_metadata_open_buf (metadata, wilber_jpg, wilber_jpg_len,
NULL))
{
g_object_unref (metadata);
return NULL;
}
}
return metadata;
}
/**
* gimp_metadata_duplicate:
* @metadata: The object to duplicate, or %NULL.
*
* Duplicates a #GimpMetadata instance.
*
* Return value: The new #GimpMetadata, or %NULL if @metadata is %NULL.
*
* Since: GIMP 2.10
*/
GimpMetadata *
gimp_metadata_duplicate (GimpMetadata *metadata)
{
GimpMetadata *new_metadata = NULL;
g_return_val_if_fail (metadata == NULL || GEXIV2_IS_METADATA (metadata), NULL);
if (metadata)
{
gchar *xml;
xml = gimp_metadata_serialize (metadata);
new_metadata = gimp_metadata_deserialize (xml);
g_free (xml);
}
return new_metadata;
}
typedef struct
{
gchar name[1024];
gboolean base64;
GimpMetadata *metadata;
} GimpMetadataParseData;
static const gchar*
gimp_metadata_attribute_name_to_value (const gchar **attribute_names,
const gchar **attribute_values,
const gchar *name)
{
while (*attribute_names)
{
if (! strcmp (*attribute_names, name))
{
return *attribute_values;
}
attribute_names++;
attribute_values++;
}
return NULL;
}
static void
gimp_metadata_deserialize_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
GimpMetadataParseData *parse_data = user_data;
if (! strcmp (element_name, "tag"))
{
const gchar *name;
const gchar *encoding;
name = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"name");
encoding = gimp_metadata_attribute_name_to_value (attribute_names,
attribute_values,
"encoding");
if (! name)
{
g_set_error (error, gimp_metadata_error_quark (), 1001,
"Element 'tag' does not contain required attribute 'name'.");
return;
}
strncpy (parse_data->name, name, sizeof (parse_data->name));
parse_data->name[sizeof (parse_data->name) - 1] = 0;
parse_data->base64 = (encoding && ! strcmp (encoding, "base64"));
}
}
static void
gimp_metadata_deserialize_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
}
static void
gimp_metadata_deserialize_text (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
GimpMetadataParseData *parse_data = user_data;
const gchar *current_element;
current_element = g_markup_parse_context_get_element (context);
if (! g_strcmp0 (current_element, "tag"))
{
gchar *value = g_strndup (text, text_len);
if (parse_data->base64)
{
guchar *decoded;
gsize len;
decoded = g_base64_decode (value, &len);
if (decoded[len - 1] == '\0')
gexiv2_metadata_set_tag_string (parse_data->metadata,
parse_data->name,
(const gchar *) decoded);
g_free (decoded);
}
else
{
gexiv2_metadata_set_tag_string (parse_data->metadata,
parse_data->name,
value);
}
g_free (value);
}
}
static void
gimp_metadata_deserialize_error (GMarkupParseContext *context,
GError *error,
gpointer user_data)
{
g_printerr ("Metadata parse error: %s\n", error->message);
}
/**
* gimp_metadata_deserialize:
* @metadata_xml: A string of serialized metadata XML.
*
* Deserializes a string of XML that has been created by
* gimp_metadata_serialize().
*
* Return value: The new #GimpMetadata.
*
* Since: GIMP 2.10
*/
GimpMetadata *
gimp_metadata_deserialize (const gchar *metadata_xml)
{
GimpMetadata *metadata;
GMarkupParser markup_parser;
GimpMetadataParseData parse_data;
GMarkupParseContext *context;
g_return_val_if_fail (metadata_xml != NULL, NULL);
metadata = gimp_metadata_new ();
parse_data.metadata = metadata;
markup_parser.start_element = gimp_metadata_deserialize_start_element;
markup_parser.end_element = gimp_metadata_deserialize_end_element;
markup_parser.text = gimp_metadata_deserialize_text;
markup_parser.passthrough = NULL;
markup_parser.error = gimp_metadata_deserialize_error;
context = g_markup_parse_context_new (&markup_parser, 0, &parse_data, NULL);
g_markup_parse_context_parse (context,
metadata_xml, strlen (metadata_xml),
NULL);
g_markup_parse_context_unref (context);
return metadata;
}
static gchar *
gimp_metadata_escape (const gchar *name,
const gchar *value,
gboolean *base64)
{
if (! g_utf8_validate (value, -1, NULL))
{
gchar *encoded;
encoded = g_base64_encode ((const guchar *) value, strlen (value) + 1);
g_printerr ("Invalid UTF-8 in metadata value %s, encoding as base64: %s\n",
name, encoded);
*base64 = TRUE;
return encoded;
}
*base64 = FALSE;
return g_markup_escape_text (value, -1);
}
static void
gimp_metadata_append_tag (GString *string,
const gchar *name,
gchar *value,
gboolean base64)
{
if (value)
{
if (base64)
{
g_string_append_printf (string, " <tag name=\"%s\" encoding=\"base64\">%s</tag>\n",
name, value);
}
else
{
g_string_append_printf (string, " <tag name=\"%s\">%s</tag>\n",
name, value);
}
g_free (value);
}
}
/**
* gimp_metadata_serialize:
* @metadata: A #GimpMetadata instance.
*
* Serializes @metadata into an XML string that can later be deserialized
* using gimp_metadata_deserialize().
*
* Return value: The serialized XML string.
*
* Since: GIMP 2.10
*/
gchar *
gimp_metadata_serialize (GimpMetadata *metadata)
{
GString *string;
gchar **exif_data = NULL;
gchar **iptc_data = NULL;
gchar **xmp_data = NULL;
gchar *value;
gchar *escaped;
gboolean base64;
gint i;
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), NULL);
string = g_string_new (NULL);
g_string_append (string, "<?xml version='1.0' encoding='UTF-8'?>\n");
g_string_append (string, "<metadata>\n");
exif_data = gexiv2_metadata_get_exif_tags (metadata);
if (exif_data)
{
for (i = 0; exif_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (metadata, exif_data[i]);
escaped = gimp_metadata_escape (exif_data[i], value, &base64);
g_free (value);
gimp_metadata_append_tag (string, exif_data[i], escaped, base64);
}
g_strfreev (exif_data);
}
xmp_data = gexiv2_metadata_get_xmp_tags (metadata);
if (xmp_data)
{
for (i = 0; xmp_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (metadata, xmp_data[i]);
escaped = gimp_metadata_escape (xmp_data[i], value, &base64);
g_free (value);
gimp_metadata_append_tag (string, xmp_data[i], escaped, base64);
}
g_strfreev (xmp_data);
}
iptc_data = gexiv2_metadata_get_iptc_tags (metadata);
if (iptc_data)
{
for (i = 0; iptc_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (metadata, iptc_data[i]);
escaped = gimp_metadata_escape (iptc_data[i], value, &base64);
g_free (value);
gimp_metadata_append_tag (string, iptc_data[i], escaped, base64);
}
g_strfreev (iptc_data);
}
g_string_append (string, "</metadata>\n");
return g_string_free (string, FALSE);
}
/**
* gimp_metadata_load_from_file:
* @file: The #GFile to load the metadata from
* @error: Return location for error message
*
* Loads #GimpMetadata from @file.
*
* Return value: The loaded #GimpMetadata.
*
* Since: GIMP 2.10
*/
GimpMetadata *
gimp_metadata_load_from_file (GFile *file,
GError **error)
{
GExiv2Metadata *meta = NULL;
gchar *path;
gchar *filename;
g_return_val_if_fail (G_IS_FILE (file), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
path = g_file_get_path (file);
if (! path)
{
g_set_error (error, gimp_metadata_error_quark (), 0,
_("Can load metadata only from local files"));
return NULL;
}
#ifdef G_OS_WIN32
filename = g_win32_locale_filename_from_utf8 (path);
#else
filename = g_strdup (path);
#endif
g_free (path);
if (gexiv2_initialize ())
{
meta = gexiv2_metadata_new ();
if (! gexiv2_metadata_open_path (meta, filename, error))
{
g_object_unref (meta);
g_free (filename);
return NULL;
}
}
g_free (filename);
return meta;
}
/**
* gimp_metadata_save_to_file:
* @metadata: A #GimpMetadata instance.
* @file: The file to save the metadata to
* @error: Return location for error message
*
* Saves @metadata to @file.
*
* Return value: %TRUE on success, %FALSE otherwise.
*
* Since: GIMP 2.10
*/
gboolean
gimp_metadata_save_to_file (GimpMetadata *metadata,
GFile *file,
GError **error)
{
gchar *path;
gchar *filename;
gboolean success;
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);
path = g_file_get_path (file);
if (! path)
{
g_set_error (error, gimp_metadata_error_quark (), 0,
_("Can save metadata only to local files"));
return FALSE;
}
#ifdef G_OS_WIN32
filename = g_win32_locale_filename_from_utf8 (path);
#else
filename = g_strdup (path);
#endif
g_free (path);
success = gexiv2_metadata_save_file (metadata, filename, error);
g_free (filename);
return success;
}
/**
* gimp_metadata_set_from_exif:
* @metadata: A #GimpMetadata instance.
* @exif_data: The blob of Exif data to set
* @exif_data_length: Length of @exif_data, in bytes
* @error: Return location for error message
*
* Sets the tags from a piece of Exif data on @metadata.
*
* Return value: %TRUE on success, %FALSE otherwise.
*
* Since: GIMP 2.10
*/
gboolean
gimp_metadata_set_from_exif (GimpMetadata *metadata,
const guchar *exif_data,
gint exif_data_length,
GError **error)
{
GByteArray *exif_bytes;
GimpMetadata *exif_metadata;
guint8 data_size[2] = { 0, };
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
g_return_val_if_fail (exif_data != NULL, FALSE);
g_return_val_if_fail (exif_data_length > 0, FALSE);
g_return_val_if_fail (exif_data_length < 65536, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
data_size[0] = (exif_data_length & 0xFF00) >> 8;
data_size[1] = (exif_data_length & 0x00FF);
exif_bytes = g_byte_array_new ();
exif_bytes = g_byte_array_append (exif_bytes,
minimal_exif, G_N_ELEMENTS (minimal_exif));
exif_bytes = g_byte_array_append (exif_bytes,
data_size, 2);
exif_bytes = g_byte_array_append (exif_bytes,
(guint8 *) exif_data, exif_data_length);
exif_metadata = gimp_metadata_new ();
if (! gexiv2_metadata_open_buf (exif_metadata,
exif_bytes->data, exif_bytes->len, error))
{
g_object_unref (exif_metadata);
g_byte_array_free (exif_bytes, TRUE);
return FALSE;
}
if (! gexiv2_metadata_has_exif (exif_metadata))
{
g_set_error (error, gimp_metadata_error_quark (), 0,
_("Parsing Exif data failed."));
g_object_unref (exif_metadata);
g_byte_array_free (exif_bytes, TRUE);
return FALSE;
}
gimp_metadata_add (exif_metadata, metadata);
g_object_unref (exif_metadata);
g_byte_array_free (exif_bytes, TRUE);
return TRUE;
}
/**
* gimp_metadata_set_from_xmp:
* @metadata: A #GimpMetadata instance.
* @xmp_data: The blob of Exif data to set
* @xmp_data_length: Length of @exif_data, in bytes
* @error: Return location for error message
*
* Sets the tags from a piece of XMP data on @metadata.
*
* Return value: %TRUE on success, %FALSE otherwise.
*
* Since: GIMP 2.10
*/
gboolean
gimp_metadata_set_from_xmp (GimpMetadata *metadata,
const guchar *xmp_data,
gint xmp_data_length,
GError **error)
{
GimpMetadata *xmp_metadata;
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
g_return_val_if_fail (xmp_data != NULL, FALSE);
g_return_val_if_fail (xmp_data_length > 0, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
xmp_data += 10;
xmp_data_length -= 10;
xmp_metadata = gimp_metadata_new ();
if (! gexiv2_metadata_open_buf (xmp_metadata,
xmp_data, xmp_data_length, error))
{
g_object_unref (xmp_metadata);
return FALSE;
}
if (! gexiv2_metadata_has_xmp (xmp_metadata))
{
g_set_error (error, gimp_metadata_error_quark (), 0,
_("Parsing XMP data failed."));
g_object_unref (xmp_metadata);
return FALSE;
}
gimp_metadata_add (xmp_metadata, metadata);
g_object_unref (xmp_metadata);
return TRUE;
}
/**
* gimp_metadata_set_pixel_size:
* @metadata: A #GimpMetadata instance.
* @width: Width in pixels
* @height: Height in pixels
*
* Sets Exif.Image.ImageWidth and Exif.Image.ImageLength on @metadata.
*
* Since: GIMP 2.10
*/
void
gimp_metadata_set_pixel_size (GimpMetadata *metadata,
gint width,
gint height)
{
gchar buffer[32];
g_return_if_fail (GEXIV2_IS_METADATA (metadata));
g_snprintf (buffer, sizeof (buffer), "%d", width);
gexiv2_metadata_set_tag_string (metadata, "Exif.Image.ImageWidth", buffer);
g_snprintf (buffer, sizeof (buffer), "%d", height);
gexiv2_metadata_set_tag_string (metadata, "Exif.Image.ImageLength", buffer);
}
/**
* gimp_metadata_set_bits_per_sample:
* @metadata: A #GimpMetadata instance.
* @bps: Bytes per pixel, per component
*
* Sets Exif.Image.BitsPerSample on @metadata.
*
* Since: GIMP 2.10
*/
void
gimp_metadata_set_bits_per_sample (GimpMetadata *metadata,
gint bps)
{
gchar buffer[32];
g_return_if_fail (GEXIV2_IS_METADATA (metadata));
g_snprintf (buffer, sizeof (buffer), "%d %d %d", bps, bps, bps);
gexiv2_metadata_set_tag_string (metadata, "Exif.Image.BitsPerSample", buffer);
}
/**
* gimp_metadata_get_resolution:
* @metadata: A #GimpMetadata instance.
* @xres: Return location for the X Resolution, in ppi
* @yres: Return location for the Y Resolution, in ppi
* @unit: Return location for the unit unit
*
* Returns values based on Exif.Image.XResolution,
* Exif.Image.YResolution and Exif.Image.ResolutionUnit of @metadata.
*
* Return value: %TRUE on success, %FALSE otherwise.
*
* Since: GIMP 2.10
*/
gboolean
gimp_metadata_get_resolution (GimpMetadata *metadata,
gdouble *xres,
gdouble *yres,
GimpUnit *unit)
{
gint xnom, xdenom;
gint ynom, ydenom;
g_return_val_if_fail (GEXIV2_IS_METADATA (metadata), FALSE);
if (gexiv2_metadata_get_exif_tag_rational (metadata,
"Exif.Image.XResolution",
&xnom, &xdenom) &&
gexiv2_metadata_get_exif_tag_rational (metadata,
"Exif.Image.YResolution",
&ynom, &ydenom))
{
gchar *un;
gint exif_unit = 2;
un = gexiv2_metadata_get_tag_string (metadata,
"Exif.Image.ResolutionUnit");
if (un)
{
exif_unit = atoi (un);
g_free (un);
}
if (xnom != 0 && xdenom != 0 &&
ynom != 0 && ydenom != 0)
{
gdouble xresolution = (gdouble) xnom / (gdouble) xdenom;
gdouble yresolution = (gdouble) ynom / (gdouble) ydenom;
if (exif_unit == 3)
{
xresolution *= 2.54;
yresolution *= 2.54;
}
if (xresolution >= GIMP_MIN_RESOLUTION &&
xresolution <= GIMP_MAX_RESOLUTION &&
yresolution >= GIMP_MIN_RESOLUTION &&
yresolution <= GIMP_MAX_RESOLUTION)
{
if (xres)
*xres = xresolution;
if (yres)
*yres = yresolution;
if (unit)
{
if (exif_unit == 3)
*unit = GIMP_UNIT_MM;
else
*unit = GIMP_UNIT_INCH;
}
return TRUE;
}
}
}
return FALSE;
}
/**
* gimp_metadata_set_resolution:
* @metadata: A #GimpMetadata instance.
* @xres: The image's X Resolution, in ppi
* @yres: The image's Y Resolution, in ppi
* @unit: The image's unit
*
* Sets Exif.Image.XResolution, Exif.Image.YResolution and
* Exif.Image.ResolutionUnit @metadata.
*
* Since: GIMP 2.10
*/
void
gimp_metadata_set_resolution (GimpMetadata *metadata,
gdouble xres,
gdouble yres,
GimpUnit unit)
{
gchar buffer[32];
gint exif_unit;
gint factor;
g_return_if_fail (GEXIV2_IS_METADATA (metadata));
if (gimp_unit_is_metric (unit))
{
xres /= 2.54;
yres /= 2.54;
exif_unit = 3;
}
else
{
exif_unit = 2;
}
for (factor = 1; factor <= 100 /* arbitrary */; factor++)
{
if (fabs (xres * factor - ROUND (xres * factor)) < 0.01 &&
fabs (yres * factor - ROUND (yres * factor)) < 0.01)
break;
}
gexiv2_metadata_set_exif_tag_rational (metadata,
"Exif.Image.XResolution",
ROUND (xres * factor), factor);
gexiv2_metadata_set_exif_tag_rational (metadata,
"Exif.Image.YResolution",
ROUND (yres * factor), factor);
g_snprintf (buffer, sizeof (buffer), "%d", exif_unit);
gexiv2_metadata_set_tag_string (metadata, "Exif.Image.ResolutionUnit", buffer);
}
/**
* gimp_metadata_is_tag_supported:
* @tag: A metadata tag name
* @mime_type: A mime type
*
* Returns whether @tag is supported in a file of type @mime_type.
*
* Return value: %TRUE if the @tag supported with @mime_type, %FALSE otherwise.
*
* Since: GIMP 2.10
*/
gboolean
gimp_metadata_is_tag_supported (const gchar *tag,
const gchar *mime_type)
{
gint j;
g_return_val_if_fail (tag != NULL, FALSE);
g_return_val_if_fail (mime_type != NULL, FALSE);
for (j = 0; j < G_N_ELEMENTS (unsupported_tags); j++)
{
if (g_str_has_prefix (tag, unsupported_tags[j]))
{
return FALSE;
}
}
if (! strcmp (mime_type, "image/jpeg"))
{
for (j = 0; j < G_N_ELEMENTS (tiff_tags); j++)
{
if (g_str_has_prefix (tag, tiff_tags[j]))
{
return FALSE;
}
}
}
else if (! strcmp (mime_type, "image/tiff"))
{
for (j = 0; j < G_N_ELEMENTS (jpeg_tags); j++)
{
if (g_str_has_prefix (tag, jpeg_tags[j]))
{
return FALSE;
}
}
}
return TRUE;
}
/* private functions */
static GQuark
gimp_metadata_error_quark (void)
{
static GQuark quark = 0;
if (G_UNLIKELY (quark == 0))
quark = g_quark_from_static_string ("gimp-metadata-error-quark");
return quark;
}
static void
gimp_metadata_add (GimpMetadata *src,
GimpMetadata *dest)
{
gchar *value;
gint i;
if (gexiv2_metadata_get_supports_exif (src) &&
gexiv2_metadata_get_supports_exif (dest))
{
gchar **exif_data = gexiv2_metadata_get_exif_tags (src);
if (exif_data)
{
for (i = 0; exif_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (src, exif_data[i]);
gexiv2_metadata_set_tag_string (dest, exif_data[i], value);
g_free (value);
}
g_strfreev (exif_data);
}
}
if (gexiv2_metadata_get_supports_xmp (src) &&
gexiv2_metadata_get_supports_xmp (dest))
{
gchar **xmp_data = gexiv2_metadata_get_xmp_tags (src);
if (xmp_data)
{
for (i = 0; xmp_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (src, xmp_data[i]);
gexiv2_metadata_set_tag_string (dest, xmp_data[i], value);
g_free (value);
}
g_strfreev (xmp_data);
}
}
if (gexiv2_metadata_get_supports_iptc (src) &&
gexiv2_metadata_get_supports_iptc (dest))
{
gchar **iptc_data = gexiv2_metadata_get_iptc_tags (src);
if (iptc_data)
{
for (i = 0; iptc_data[i] != NULL; i++)
{
value = gexiv2_metadata_get_tag_string (src, iptc_data[i]);
gexiv2_metadata_set_tag_string (dest, iptc_data[i], value);
g_free (value);
}
g_strfreev (iptc_data);
}
}
}
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