AlderconeStudio/PIKApp
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PIKApp
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PIKApp/app/core/pikaimage-metadata.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include <gexiv2/gexiv2.h>
#include "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "core-types.h"
#include "pika.h"
#include "pikaimage.h"
#include "pikaimage-color-profile.h"
#include "pikaimage-metadata.h"
#include "pikaimage-private.h"
#include "pikaimage-rotate.h"
#include "pikaimage-undo.h"
#include "pikaimage-undo-push.h"
#include "pikalayer-new.h"
/* public functions */
PikaMetadata *
pika_image_get_metadata (PikaImage *image)
{
PikaImagePrivate *private;
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
private = PIKA_IMAGE_GET_PRIVATE (image);
return private->metadata;
}
void
pika_image_set_metadata (PikaImage *image,
PikaMetadata *metadata,
gboolean push_undo)
{
PikaImagePrivate *private;
g_return_if_fail (PIKA_IS_IMAGE (image));
private = PIKA_IMAGE_GET_PRIVATE (image);
if (metadata != private->metadata)
{
if (push_undo)
pika_image_undo_push_image_metadata (image, NULL);
g_set_object (&private->metadata, metadata);
if (private->metadata)
{
pika_image_metadata_update_pixel_size (image);
pika_image_metadata_update_bits_per_sample (image);
pika_image_metadata_update_resolution (image);
pika_image_metadata_update_colorspace (image);
}
g_object_notify (G_OBJECT (image), "metadata");
}
}
void
pika_image_metadata_update_pixel_size (PikaImage *image)
{
PikaMetadata *metadata;
g_return_if_fail (PIKA_IS_IMAGE (image));
metadata = pika_image_get_metadata (image);
if (metadata)
{
pika_metadata_set_pixel_size (metadata,
pika_image_get_width (image),
pika_image_get_height (image));
}
}
void
pika_image_metadata_update_bits_per_sample (PikaImage *image)
{
PikaMetadata *metadata;
g_return_if_fail (PIKA_IS_IMAGE (image));
metadata = pika_image_get_metadata (image);
if (metadata)
{
switch (pika_image_get_component_type (image))
{
case PIKA_COMPONENT_TYPE_U8:
pika_metadata_set_bits_per_sample (metadata, 8);
break;
case PIKA_COMPONENT_TYPE_U16:
case PIKA_COMPONENT_TYPE_HALF:
pika_metadata_set_bits_per_sample (metadata, 16);
break;
case PIKA_COMPONENT_TYPE_U32:
case PIKA_COMPONENT_TYPE_FLOAT:
pika_metadata_set_bits_per_sample (metadata, 32);
break;
case PIKA_COMPONENT_TYPE_DOUBLE:
pika_metadata_set_bits_per_sample (metadata, 64);
break;
}
}
}
void
pika_image_metadata_update_resolution (PikaImage *image)
{
PikaMetadata *metadata;
g_return_if_fail (PIKA_IS_IMAGE (image));
metadata = pika_image_get_metadata (image);
if (metadata)
{
gdouble xres, yres;
pika_image_get_resolution (image, &xres, &yres);
pika_metadata_set_resolution (metadata, xres, yres,
pika_image_get_unit (image));
}
}
void
pika_image_metadata_update_colorspace (PikaImage *image)
{
PikaMetadata *metadata;
g_return_if_fail (PIKA_IS_IMAGE (image));
metadata = pika_image_get_metadata (image);
if (metadata)
{
/* See the discussions in issue #3532 and issue #301 */
PikaColorProfile *profile = pika_image_get_color_profile (image);
PikaMetadataColorspace space = PIKA_METADATA_COLORSPACE_UNSPECIFIED;
if (profile)
{
static PikaColorProfile *adobe = NULL;
if (! adobe)
adobe = pika_color_profile_new_rgb_adobe ();
if (pika_color_profile_is_equal (profile, adobe))
space = PIKA_METADATA_COLORSPACE_ADOBERGB;
}
else
{
space = PIKA_METADATA_COLORSPACE_SRGB;
}
pika_metadata_set_colorspace (metadata, space);
}
}
/**
* pika_image_metadata_load_thumbnail:
* @pika: The #Pika object.
* @file: A #GFile image.
* @full_image_width: the width of the full image (not the thumbnail).
* @full_image_height: the height of the full image (not the thumbnail).
* @error: Return location for error message
*
* Retrieves a thumbnail from metadata in @file if present.
* It does not need to actually load the full image, only the metadata through
* GExiv2, which makes it fast.
*
* Returns: (transfer none) (nullable): a #PikaImage of the @file thumbnail.
*/
PikaImage *
pika_image_metadata_load_thumbnail (Pika *pika,
GFile *file,
gint *full_image_width,
gint *full_image_height,
const Babl **format,
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 (pika,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
PIKA_RGB, PIKA_PRECISION_U8_NON_LINEAR);
pika_image_undo_disable (image);
/* XXX This is possibly wrong, because an image of a given color space may
* have a thumbnail stored in a different colorspace. This is even more
* true with PIKA which always exports RGB thumbnails (see code in
* pika_image_metadata_save_filter()), even for say grayscale images.
* Nevertheless other software may store thumbnail using the same
* colorspace.
*/
*format = pika_pixbuf_get_format (pixbuf);
layer = pika_layer_new_from_pixbuf (pixbuf, image,
pika_image_get_layer_format (image, FALSE),
/* No need to localize; this image is short-lived. */
"Background",
PIKA_OPACITY_OPAQUE,
pika_image_get_default_new_layer_mode (image));
g_object_unref (pixbuf);
pika_image_add_layer (image, layer, NULL, 0, FALSE);
pika_image_apply_metadata_orientation (image, pika_get_user_context (pika), metadata, NULL);
}
/* This is the unoriented dimensions. Should we switch when there is a 90 or
* 270 degree rotation? We don't actually know if the metadata orientation is
* correct.
*/
*full_image_width = gexiv2_metadata_get_pixel_width (GEXIV2_METADATA (metadata));
*full_image_height = gexiv2_metadata_get_pixel_height (GEXIV2_METADATA (metadata));
if (*full_image_width < 1 || *full_image_height < 1)
{
/* Dimensions stored in metadata might be less accurate, yet it's still
* informational.
*/
*full_image_width = gexiv2_metadata_try_get_metadata_pixel_width (GEXIV2_METADATA (metadata), NULL);
*full_image_height = gexiv2_metadata_try_get_metadata_pixel_width (GEXIV2_METADATA (metadata), NULL);
}
if (*full_image_width < 1 || *full_image_height < 1)
{
*full_image_width = 0;
*full_image_height = 0;
}
g_object_unref (metadata);
return image;
}
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