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gimp/plug-ins/file-jpeg/jpeg-load.c

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/* GIMP - The GNU Image Manipulation Program
* 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 <string.h>
#include <errno.h>
#include <setjmp.h>
#include <gio/gio.h>
#include <glib/gstdio.h>
#include <gexiv2/gexiv2.h>
#include <jpeglib.h>
#include <jerror.h>
#include <lcms2.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#include "jpeg.h"
#include "jpeg-icc.h"
#include "jpeg-settings.h"
#include "jpeg-load.h"
static gboolean jpeg_load_resolution (GimpImage *image,
struct jpeg_decompress_struct
*cinfo);
static void jpeg_load_sanitize_comment (gchar *comment);
GimpImage * volatile preview_image;
GimpLayer * preview_layer;
GimpImage *
load_image (GFile *file,
GimpRunMode runmode,
gboolean preview,
gboolean *resolution_loaded,
gboolean *ps_metadata_loaded,
GError **error)
{
GimpImage * volatile image;
GimpLayer *layer;
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
jpeg_saved_marker_ptr marker;
FILE *infile;
guchar *buf;
guchar **rowbuf;
GimpImageBaseType image_type;
GimpImageType layer_type;
GeglBuffer *buffer = NULL;
const Babl *format;
const Babl *space;
const gchar *encoding;
const gchar *layer_name = NULL;
GimpColorProfile *cmyk_profile = NULL;
gint tile_height;
gint i;
guchar *photoshop_data = NULL;
guint photoshop_len = 0;
/* We set up the normal JPEG error routines. */
cinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (! preview)
{
jerr.pub.output_message = my_output_message;
gimp_progress_init_printf (_("Opening '%s'"),
gimp_file_get_utf8_name (file));
}
infile = g_fopen (g_file_peek_path (file), "rb");
if (! infile)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_file_get_utf8_name (file), g_strerror (errno));
return NULL;
}
image = NULL;
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp (jerr.setjmp_buffer))
{
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return.
*/
jpeg_destroy_decompress (&cinfo);
if (infile)
fclose (infile);
if (image && !preview)
gimp_image_delete (image);
if (preview)
destroy_preview ();
if (buffer)
g_object_unref (buffer);
return NULL;
}
/* Now we can initialize the JPEG decompression object. */
jpeg_create_decompress (&cinfo);
/* Step 2: specify data source (eg, a file) */
jpeg_stdio_src (&cinfo, infile);
if (! preview)
{
/* - step 2.1: tell the lib to save the comments */
jpeg_save_markers (&cinfo, JPEG_COM, 0xffff);
/* - step 2.2: tell the lib to save APP1 data (Exif or XMP) */
jpeg_save_markers (&cinfo, JPEG_APP0 + 1, 0xffff);
/* - step 2.3: tell the lib to save APP2 data (ICC profiles) */
jpeg_save_markers (&cinfo, JPEG_APP0 + 2, 0xffff);
/* - step 2.4: tell the lib to save APP13 data (clipping path) */
jpeg_save_markers (&cinfo, JPEG_APP0 + 13, 0xffff);
}
/* Step 3: read file parameters with jpeg_read_header() */
jpeg_read_header (&cinfo, TRUE);
/* We can ignore the return value from jpeg_read_header since
* (a) suspension is not possible with the stdio data source, and
* (b) we passed TRUE to reject a tables-only JPEG file as an error.
* See libjpeg.doc for more info.
*/
/* Step 4: set parameters for decompression */
/* In this example, we don't need to change any of the defaults set by
* jpeg_read_header(), so we do nothing here, except set the DCT
* method.
*/
cinfo.dct_method = JDCT_FLOAT;
/* Step 5: Start decompressor */
jpeg_start_decompress (&cinfo);
/* We may need to do some setup of our own at this point before reading
* the data. After jpeg_start_decompress() we have the correct scaled
* output image dimensions available, as well as the output colormap
* if we asked for color quantization.
*/
/* temporary buffer */
tile_height = gimp_tile_height ();
buf = g_new (guchar,
tile_height * cinfo.output_width * cinfo.output_components);
rowbuf = g_new (guchar *, tile_height);
for (i = 0; i < tile_height; i++)
rowbuf[i] = buf + cinfo.output_width * cinfo.output_components * i;
switch (cinfo.output_components)
{
case 1:
image_type = GIMP_GRAY;
layer_type = GIMP_GRAY_IMAGE;
break;
case 3:
image_type = GIMP_RGB;
layer_type = GIMP_RGB_IMAGE;
break;
case 4:
if (cinfo.out_color_space == JCS_CMYK)
{
image_type = GIMP_RGB;
layer_type = GIMP_RGB_IMAGE;
break;
}
/*fallthrough*/
default:
g_message ("Don't know how to load JPEG images "
"with %d color channels, using colorspace %d (%d).",
cinfo.output_components, cinfo.out_color_space,
cinfo.jpeg_color_space);
return NULL;
break;
}
if (preview)
{
layer_name = _("JPEG preview");
image = preview_image;
}
else
{
GString *comment_buffer = NULL;
guint8 *icc_data = NULL;
guint icc_length = 0;
layer_name = _("Background");
image = gimp_image_new_with_precision (cinfo.output_width,
cinfo.output_height,
image_type,
GIMP_PRECISION_U8_NON_LINEAR);
gimp_image_undo_disable (image);
/* Step 5.0: save the original JPEG settings in a parasite */
jpeg_detect_original_settings (&cinfo, image);
/* Step 5.1: check for comments, or Exif metadata in APP1 markers */
for (marker = cinfo.marker_list; marker; marker = marker->next)
{
const gchar *data = (const gchar *) marker->data;
gsize len = marker->data_length;
if (marker->marker == JPEG_COM)
{
#ifdef GIMP_UNSTABLE
g_print ("jpeg-load: found image comment (%d bytes)\n",
marker->data_length);
#endif
if (! comment_buffer)
{
comment_buffer = g_string_new_len (data, len);
}
else
{
/* concatenate multiple comments, separate them with LF */
g_string_append_c (comment_buffer, '\n');
g_string_append_len (comment_buffer, data, len);
}
}
else if ((marker->marker == JPEG_APP0 + 1)
&& (len > sizeof (JPEG_APP_HEADER_EXIF) + 8)
&& ! strcmp (JPEG_APP_HEADER_EXIF, data))
{
#ifdef GIMP_UNSTABLE
g_print ("jpeg-load: found Exif block (%d bytes)\n",
(gint) (len - sizeof (JPEG_APP_HEADER_EXIF)));
#endif
}
else if (marker->marker == JPEG_APP0 + 13)
{
photoshop_data = g_new (guchar, len);
photoshop_len = len;
memcpy (photoshop_data, (guchar *) marker->data, len);
*ps_metadata_loaded = TRUE;
#ifdef GIMP_UNSTABLE
g_print ("jpeg-load: found Photoshop block (%d bytes) %s\n",
(gint) (len - sizeof (JPEG_APP_HEADER_EXIF)), data);
#endif
}
}
if (jpeg_load_resolution (image, &cinfo))
{
if (resolution_loaded)
*resolution_loaded = TRUE;
}
/* if we found any comments, then make a parasite for them */
if (comment_buffer && comment_buffer->len)
{
GimpParasite *parasite;
jpeg_load_sanitize_comment (comment_buffer->str);
parasite = gimp_parasite_new ("gimp-comment",
GIMP_PARASITE_PERSISTENT,
strlen (comment_buffer->str) + 1,
comment_buffer->str);
gimp_image_attach_parasite (image, parasite);
gimp_parasite_free (parasite);
g_string_free (comment_buffer, TRUE);
}
/* Step 5.3: check for an embedded ICC profile in APP2 markers */
jpeg_icc_read_profile (&cinfo, &icc_data, &icc_length);
if (icc_data)
{
GimpColorProfile *profile;
profile = gimp_color_profile_new_from_icc_profile (icc_data,
icc_length,
NULL);
if (cinfo.out_color_space == JCS_CMYK)
{
/* don't attach the profile if we are transforming */
cmyk_profile = profile;
profile = NULL;
}
if (profile)
{
gimp_image_set_color_profile (image, profile);
g_object_unref (profile);
}
}
g_free (icc_data);
/* Do not attach the "jpeg-save-options" parasite to the image
* because this conflicts with the global defaults (bug #75398).
*/
}
layer = gimp_layer_new (image, layer_name,
cinfo.output_width,
cinfo.output_height,
layer_type,
100,
gimp_image_get_default_new_layer_mode (image));
if (preview)
preview_layer = layer;
/* Step 6: while (scan lines remain to be read) */
/* jpeg_read_scanlines(...); */
/* Here we use the library's state variable cinfo.output_scanline as the
* loop counter, so that we don't have to keep track ourselves.
*/
buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (layer));
if (cinfo.out_color_space == JCS_CMYK)
{
encoding = "cmyk u8";
if (cmyk_profile)
{
space = gimp_color_profile_get_space (cmyk_profile,
GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
error);
gimp_image_set_simulation_profile (image, cmyk_profile);
}
else
{
space = NULL;
}
}
else
{
if (image_type == GIMP_RGB)
encoding = "R'G'B' u8";
else
encoding = "Y' u8";
space = gimp_drawable_get_format (GIMP_DRAWABLE (layer));
}
format = babl_format_with_space (encoding, space);
while (cinfo.output_scanline < cinfo.output_height)
{
gint start, end;
gint scanlines;
gboolean image_truncated = FALSE;
start = cinfo.output_scanline;
end = cinfo.output_scanline + tile_height;
end = MIN (end, cinfo.output_height);
scanlines = end - start;
/* in case of error we now jump here, so pertially loaded imaged
* don't get discarded
*/
if (setjmp (jerr.setjmp_buffer))
{
image_truncated = TRUE;
goto set_buffer;
}
for (i = 0; i < scanlines; i++)
jpeg_read_scanlines (&cinfo, (JSAMPARRAY) &rowbuf[i], 1);
set_buffer:
gegl_buffer_set (buffer,
GEGL_RECTANGLE (0, start, cinfo.output_width, scanlines),
0,
format,
buf,
GEGL_AUTO_ROWSTRIDE);
if (image_truncated)
/* jumping to finish skips jpeg_finish_decompress(), its state
* might be broken by whatever caused the loading failure
*/
goto finish;
if (! preview && (cinfo.output_scanline % 32) == 0)
gimp_progress_update ((gdouble) cinfo.output_scanline /
(gdouble) cinfo.output_height);
}
/* Step 7: Finish decompression */
jpeg_finish_decompress (&cinfo);
/* We can ignore the return value since suspension is not possible
* with the stdio data source.
*/
finish:
g_clear_object (&cmyk_profile);
/* Step 8: Release JPEG decompression object */
/* This is an important step since it will release a good deal of memory. */
jpeg_destroy_decompress (&cinfo);
g_object_unref (buffer);
/* free up the temporary buffers */
g_free (rowbuf);
g_free (buf);
/* After finish_decompress, we can close the input file.
* Here we postpone it until after no more JPEG errors are possible,
* so as to simplify the setjmp error logic above. (Actually, I don't
* think that jpeg_destroy can do an error exit, but why assume anything...)
*/
fclose (infile);
/* At this point you may want to check to see whether any corrupt-data
* warnings occurred (test whether jerr.num_warnings is nonzero).
*/
/* Detach from the drawable and add it to the image.
*/
if (! preview)
{
gimp_progress_update (1.0);
}
gimp_image_insert_layer (image, layer, NULL, 0);
/* Step 9: Load PSD-format metadata if applicable */
if (photoshop_len > 0)
{
FILE *fp;
GFile *temp_file = NULL;
GimpProcedure *procedure;
GimpValueArray *return_vals = NULL;
temp_file = gimp_temp_file ("tmp");
fp = g_fopen (g_file_peek_path (temp_file), "wb");
if (! fp)
{
g_message (_("Error trying to open temporary %s file '%s' "
"for jpeg metadata loading: %s"),
"tmp",
gimp_file_get_utf8_name (temp_file),
g_strerror (errno));
}
fwrite (photoshop_data + (sizeof (JPEG_APP_HEADER_EXIF) * 2),
sizeof (guchar), photoshop_len - sizeof (JPEG_APP_HEADER_EXIF),
fp);
fclose (fp);
g_free (photoshop_data);
procedure = gimp_pdb_lookup_procedure (gimp_get_pdb (),
"file-psd-load-metadata");
return_vals = gimp_procedure_run (procedure,
"run-mode", GIMP_RUN_NONINTERACTIVE,
"file", temp_file,
"size", photoshop_len,
"image", image,
"metadata-type", FALSE,
NULL);
g_file_delete (temp_file, NULL, NULL);
g_object_unref (temp_file);
gimp_value_array_unref (return_vals);
}
return image;
}
static gboolean
jpeg_load_resolution (GimpImage *image,
struct jpeg_decompress_struct *cinfo)
{
if (cinfo->saw_JFIF_marker && cinfo->X_density != 0 && cinfo->Y_density != 0)
{
gdouble xresolution = cinfo->X_density;
gdouble yresolution = cinfo->Y_density;
gdouble asymmetry = 1.0;
switch (cinfo->density_unit)
{
case 0: /* unknown -> set the aspect ratio but use the default
* image resolution
*/
asymmetry = xresolution / yresolution;
gimp_image_get_resolution (image, &xresolution, &yresolution);
xresolution *= asymmetry;
break;
case 1: /* dots per inch */
break;
case 2: /* dots per cm */
xresolution *= 2.54;
yresolution *= 2.54;
gimp_image_set_unit (image, GIMP_UNIT_MM);
break;
default:
g_message ("Unknown density unit %d, assuming dots per inch.",
cinfo->density_unit);
break;
}
gimp_image_set_resolution (image, xresolution, yresolution);
return TRUE;
}
return FALSE;
}
/*
* A number of JPEG files have comments written in a local character set
* instead of UTF-8. Some of these files may have been saved by older
* versions of GIMP. It is not possible to reliably detect the character
* set used, but it is better to keep all characters in the ASCII range
* and replace the non-ASCII characters instead of discarding the whole
* comment. This is especially useful if the comment contains only a few
* non-ASCII characters such as a copyright sign, a soft hyphen, etc.
*/
static void
jpeg_load_sanitize_comment (gchar *comment)
{
const gchar *start_invalid;
if (! g_utf8_validate (comment, -1, &start_invalid))
{
guchar *c;
for (c = (guchar *) start_invalid; *c; c++)
{
if (*c > 126 || (*c < 32 && *c != '\t' && *c != '\n' && *c != '\r'))
*c = '?';
}
}
}
GimpImage *
load_thumbnail_image (GFile *file,
gint *width,
gint *height,
GimpImageType *type,
GError **error)
{
GimpImage * volatile image = NULL;
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
FILE *infile = NULL;
gimp_progress_init_printf (_("Opening thumbnail for '%s'"),
g_file_get_parse_name (file));
image = gimp_image_metadata_load_thumbnail (file, error);
if (! image)
return NULL;
cinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = my_error_exit;
jerr.pub.output_message = my_output_message;
if ((infile = g_fopen (g_file_peek_path (file), "rb")) == NULL)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
g_file_get_parse_name (file), g_strerror (errno));
if (image)
gimp_image_delete (image);
return NULL;
}
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp (jerr.setjmp_buffer))
{
/* If we get here, the JPEG code has signaled an error. We
* need to clean up the JPEG object, close the input file,
* and return.
*/
jpeg_destroy_decompress (&cinfo);
if (image)
gimp_image_delete (image);
return NULL;
}
/* Now we can initialize the JPEG decompression object. */
jpeg_create_decompress (&cinfo);
/* Step 2: specify data source (eg, a file) */
jpeg_stdio_src (&cinfo, infile);
/* Step 3: read file parameters with jpeg_read_header() */
jpeg_read_header (&cinfo, TRUE);
jpeg_start_decompress (&cinfo);
*width = cinfo.output_width;
*height = cinfo.output_height;
switch (cinfo.output_components)
{
case 1:
*type = GIMP_GRAY_IMAGE;
break;
case 3:
*type = GIMP_RGB_IMAGE;
break;
case 4:
if (cinfo.out_color_space == JCS_CMYK)
{
*type = GIMP_RGB_IMAGE;
break;
}
/*fallthrough*/
default:
g_message ("Don't know how to load JPEG images "
"with %d color channels, using colorspace %d (%d).",
cinfo.output_components, cinfo.out_color_space,
cinfo.jpeg_color_space);
gimp_image_delete (image);
image = NULL;
break;
}
/* Step 4: Release JPEG decompression object */
/* This is an important step since it will release a good deal
* of memory.
*/
jpeg_destroy_decompress (&cinfo);
fclose (infile);
return image;
}
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