void
jpeg_exif_rotate_query (gint32 image_ID,
gint orientation)
{
GimpParasite *parasite;
gboolean query = load_interactive;
if (orientation < 2 || orientation > 8)
return;
parasite = gimp_parasite_find (JPEG_EXIF_ROTATE_PARASITE);
if (parasite)
{
if (strncmp (gimp_parasite_data (parasite), "yes",
gimp_parasite_data_size (parasite)) == 0)
{
query = FALSE;
}
else if (strncmp (gimp_parasite_data (parasite), "no",
gimp_parasite_data_size (parasite)) == 0)
{
gimp_parasite_free (parasite);
return;
}
gimp_parasite_free (parasite);
}
if (query && ! jpeg_exif_rotate_query_dialog (image_ID))
return;
jpeg_exif_rotate (image_ID, orientation);
}
gint32
load_thumbnail_image (const gchar *filename,
gint *width,
gint *height,
GError **error)
{
gint32 volatile image_ID;
ExifData *exif_data;
GimpPixelRgn pixel_rgn;
GimpDrawable *drawable;
gint32 layer_ID;
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
guchar *buf;
guchar **rowbuf;
gint image_type;
gint layer_type;
gint tile_height;
gint scanlines;
gint i, start, end;
gint orientation;
my_src_ptr src;
FILE *infile;
image_ID = -1;
exif_data = jpeg_exif_data_new_from_file (filename, NULL);
if (! ((exif_data) && (exif_data->data) && (exif_data->size > 0)))
return -1;
orientation = jpeg_exif_get_orientation (exif_data);
cinfo.err = jpeg_std_error (&jerr.pub);
jerr.pub.error_exit = my_error_exit;
jerr.pub.output_message = my_output_message;
gimp_progress_init_printf (_("Opening thumbnail for '%s'"),
gimp_filename_to_utf8 (filename));
/* 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_ID != -1)
gimp_image_delete (image_ID);
if (exif_data)
{
exif_data_unref (exif_data);
exif_data = NULL;
}
return -1;
}
/* Now we can initialize the JPEG decompression object. */
jpeg_create_decompress (&cinfo);
/* Step 2: specify data source (eg, a file) */
if (cinfo.src == NULL)
cinfo.src = (struct jpeg_source_mgr *)(*cinfo.mem->alloc_small)
((j_common_ptr) &cinfo, JPOOL_PERMANENT,
sizeof (my_source_mgr));
src = (my_src_ptr) cinfo.src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = term_source;
src->pub.bytes_in_buffer = exif_data->size;
src->pub.next_input_byte = exif_data->data;
src->buffer = exif_data->data;
src->size = exif_data->size;
/* Step 3: read file parameters with jpeg_read_header() */
jpeg_read_header (&cinfo, TRUE);
/* 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.
*/
/* 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. In
* this example, we need to make an output work buffer of the
* right size.
*/
/* 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;
/* Create a new image of the proper size and associate the
* filename with it.
*/
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);
if (exif_data)
{
exif_data_unref (exif_data);
exif_data = NULL;
}
return -1;
break;
}
image_ID = gimp_image_new (cinfo.output_width, cinfo.output_height,
image_type);
gimp_image_undo_disable (image_ID);
gimp_image_set_filename (image_ID, filename);
jpeg_load_resolution (image_ID, &cinfo);
layer_ID = gimp_layer_new (image_ID, _("Background"),
cinfo.output_width,
cinfo.output_height,
layer_type, 100, GIMP_NORMAL_MODE);
drawable_global = drawable = gimp_drawable_get (layer_ID);
gimp_pixel_rgn_init (&pixel_rgn, drawable, 0, 0,
drawable->width, drawable->height, TRUE, FALSE);
/* 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.
*/
while (cinfo.output_scanline < cinfo.output_height)
{
start = cinfo.output_scanline;
end = cinfo.output_scanline + tile_height;
end = MIN (end, cinfo.output_height);
scanlines = end - start;
for (i = 0; i < scanlines; i++)
jpeg_read_scanlines (&cinfo, (JSAMPARRAY) &rowbuf[i], 1);
if (cinfo.out_color_space == JCS_CMYK)
jpeg_load_cmyk_to_rgb (buf, drawable->width * scanlines, NULL);
gimp_pixel_rgn_set_rect (&pixel_rgn, buf,
0, start, drawable->width, scanlines);
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.
*/
/* Step 8: Release JPEG decompression object */
/* This is an important step since it will release a good deal
* of memory.
*/
jpeg_destroy_decompress (&cinfo);
/* free up the temporary buffers */
g_free (rowbuf);
g_free (buf);
/* At this point you may want to check to see whether any
* corrupt-data warnings occurred (test whether
* jerr.num_warnings is nonzero).
*/
gimp_image_insert_layer (image_ID, layer_ID, -1, 0);
/* NOW to get the dimensions of the actual image to return the
* calling app
*/
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 (filename, "rb")) == NULL)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
if (exif_data)
{
exif_data_unref (exif_data);
exif_data = NULL;
}
return -1;
}
/* 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_ID != -1)
gimp_image_delete (image_ID);
if (exif_data)
{
exif_data_unref (exif_data);
exif_data = NULL;
}
return -1;
}
/* 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;
/* 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);
if (exif_data)
{
exif_data_unref (exif_data);
exif_data = NULL;
}
jpeg_exif_rotate (image_ID, orientation);
return image_ID;
}
