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gimp/plug-ins/common/file-pdf-load.c

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/* GIMP - The GNU Image Manipulation Program
*
* file-pdf-load.c - PDF file loader
*
* Copyright (C) 2005 Nathan Summers
*
* Some code in render_page_to_surface() borrowed from
* poppler.git/glib/poppler-page.cc.
*
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#undef GTK_DISABLE_SINGLE_INCLUDES
#include <poppler.h>
#define GTK_DISABLE_SINGLE_INCLUDES
#include "libgimp/stdplugins-intl.h"
#define LOAD_PROC "file-pdf-load"
#define LOAD_THUMB_PROC "file-pdf-load-thumb"
#define PLUG_IN_BINARY "file-pdf-load"
#define PLUG_IN_ROLE "gimp-file-pdf-load"
#define THUMBNAIL_SIZE 128
#define GIMP_PLUGIN_PDF_LOAD_ERROR gimp_plugin_pdf_load_error_quark ()
static GQuark
gimp_plugin_pdf_load_error_quark (void)
{
return g_quark_from_static_string ("gimp-plugin-pdf-load-error-quark");
}
typedef struct
{
gsize n_pages;
gint *pages;
} PdfSelectedPages;
typedef struct _Pdf Pdf;
typedef struct _PdfClass PdfClass;
struct _Pdf
{
GimpPlugIn parent_instance;
};
struct _PdfClass
{
GimpPlugInClass parent_class;
};
#define PDF_TYPE (pdf_get_type ())
#define PDF(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), PDF_TYPE, Pdf))
GType pdf_get_type (void) G_GNUC_CONST;
static GList * pdf_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * pdf_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static gboolean pdf_extract (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
GimpMetadata *metadata,
GimpProcedureConfig *config,
GimpVectorLoadData *extracted_dimensions,
gpointer *data_for_run,
GDestroyNotify *data_for_run_destroy,
gpointer extract_data,
GError **error);
static GimpValueArray * pdf_load (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
gint width,
gint height,
GimpVectorLoadData extracted_data,
GimpMetadata *metadata,
GimpMetadataLoadFlags *flags,
GimpProcedureConfig *config,
gpointer data_from_extract,
gpointer run_data);
static GimpValueArray * pdf_load_thumb (GimpProcedure *procedure,
GFile *file,
gint size,
GimpProcedureConfig *config,
gpointer run_data);
static GimpImage * load_image (PopplerDocument *doc,
GFile *file,
GimpVectorLoadData extracted_data,
GimpRunMode run_mode,
GimpPageSelectorTarget target,
gint width,
gint height,
gdouble resolution,
gboolean antialias,
gboolean white_background,
gboolean reverse_order,
PdfSelectedPages *pages);
static GimpPDBStatusType load_dialog (PopplerDocument *doc,
PdfSelectedPages *pages,
GimpVectorLoadData extracted_data,
GimpProcedure *procedure,
GimpProcedureConfig *config);
static PopplerDocument * open_document (GFile *file,
const gchar *PDF_password,
GimpRunMode run_mode,
gdouble *width,
gdouble *height,
GError **error);
static cairo_surface_t * get_thumb_surface (PopplerDocument *doc,
gint page,
gint preferred_size,
gboolean white_background);
static GdkPixbuf * get_thumb_pixbuf (PopplerDocument *doc,
gint page,
gint preferred_size,
gboolean white_background);
static GimpLayer * layer_from_surface (GimpImage *image,
const gchar *layer_name,
gint position,
cairo_surface_t *surface,
gdouble progress_start,
gdouble progress_scale);
G_DEFINE_TYPE (Pdf, pdf, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (PDF_TYPE)
DEFINE_STD_SET_I18N
static void
pdf_class_init (PdfClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = pdf_query_procedures;
plug_in_class->create_procedure = pdf_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
pdf_init (Pdf *pdf)
{
}
static GList *
pdf_query_procedures (GimpPlugIn *plug_in)
{
GList *list = NULL;
list = g_list_append (list, g_strdup (LOAD_THUMB_PROC));
list = g_list_append (list, g_strdup (LOAD_PROC));
return list;
}
static GimpProcedure *
pdf_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, LOAD_PROC))
{
procedure = gimp_vector_load_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
pdf_extract, NULL, NULL,
pdf_load, NULL, NULL);
gimp_procedure_set_menu_label (procedure, _("Portable Document Format"));
gimp_procedure_set_documentation (procedure,
"Load file in PDF format",
"Loads files in Adobe's Portable "
"Document Format. PDF is designed to "
"be easily processed by a variety "
"of different platforms, and is a "
"distant cousin of PostScript.",
name);
gimp_procedure_set_attribution (procedure,
"Nathan Summers, Lionel N.",
"Nathan Summers, Lionel N.",
"2005, 2017");
gimp_file_procedure_set_format_name (GIMP_FILE_PROCEDURE (procedure),
_("PDF"));
gimp_file_procedure_set_mime_types (GIMP_FILE_PROCEDURE (procedure),
"application/pdf");
gimp_file_procedure_set_extensions (GIMP_FILE_PROCEDURE (procedure),
"pdf");
gimp_file_procedure_set_magics (GIMP_FILE_PROCEDURE (procedure),
"0, string,%PDF-");
gimp_load_procedure_set_thumbnail_loader (GIMP_LOAD_PROCEDURE (procedure),
LOAD_THUMB_PROC);
gimp_procedure_add_string_argument (procedure, "password",
_("PDF password"),
_("The password to decrypt the encrypted PDF file"),
NULL,
G_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "reverse-order",
_("Load in re_verse order"),
_("Load PDF pages in reverse order"),
FALSE,
G_PARAM_READWRITE);
/* FIXME: this should be a gimp_procedure_add_enum_argument () of type
* GIMP_TYPE_PAGE_SELECTOR_TARGET but it won't work right now (see FIXME
* comment in libgimp/gimpgpparams-body.c:116).
gimp_procedure_add_enum_argument (procedure, "target",
_("Open pages as"),
_("Number of pages to load (0 for all)"),
GIMP_TYPE_PAGE_SELECTOR_TARGET,
GIMP_PAGE_SELECTOR_TARGET_LAYERS,
G_PARAM_READWRITE);
*/
gimp_procedure_add_int_aux_argument (procedure, "target",
_("Open pages as"),
_("Number of pages to load (0 for all)"),
GIMP_PAGE_SELECTOR_TARGET_LAYERS, GIMP_PAGE_SELECTOR_TARGET_IMAGES,
GIMP_PAGE_SELECTOR_TARGET_LAYERS,
G_PARAM_READWRITE);
/* FIXME: shouldn't the whole selector be considered as one argument
* containing properties "target" and "pages" as a single object?
*
* Or actually should we store pages at all? While it makes sense to store
* some settings generally, not sure that the list of page makes sense
* from one PDF document loaded to another (different) one.
*/
gimp_procedure_add_int32_array_argument (procedure, "pages",
_("Pages"),
_("The pages to load in the expected order"),
G_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "antialias",
_("Use _Anti-aliasing"),
_("Render texts with anti-aliasing"),
TRUE,
G_PARAM_READWRITE);
gimp_procedure_add_boolean_argument (procedure, "white-background",
_("_Fill transparent areas with white"),
_("Render all pages as opaque by filling the background in white"),
TRUE,
G_PARAM_READWRITE);
}
else if (! strcmp (name, LOAD_THUMB_PROC))
{
procedure = gimp_thumbnail_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
pdf_load_thumb, NULL, NULL);
gimp_procedure_set_documentation (procedure,
"Loads a preview from a PDF file.",
"Loads a small preview of the first "
"page of the PDF format file. Uses "
"the embedded thumbnail if present.",
name);
gimp_procedure_set_attribution (procedure,
"Nathan Summers",
"Nathan Summers",
"2005");
}
return procedure;
}
static gboolean
pdf_extract (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
GimpMetadata *metadata,
GimpProcedureConfig *config,
GimpVectorLoadData *extracted_dimensions,
gpointer *data_for_run,
GDestroyNotify *data_for_run_destroy,
gpointer extract_data,
GError **error)
{
PopplerDocument *doc = NULL;
gchar *password = NULL;
gdouble width = 0.0;
gdouble height = 0.0;
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_ui_init (PLUG_IN_BINARY);
g_object_get (config, "password", &password, NULL);
doc = open_document (file, password, run_mode,
&width, &height, error);
g_free (password);
if (doc == NULL)
return FALSE;
extracted_dimensions->width = width;
extracted_dimensions->height = height;
extracted_dimensions->width_unit = gimp_unit_point ();
extracted_dimensions->height_unit = gimp_unit_point ();
extracted_dimensions->exact_width = TRUE;
extracted_dimensions->exact_height = TRUE;
extracted_dimensions->correct_ratio = TRUE;
*data_for_run = doc;
*data_for_run_destroy = g_object_unref;
return TRUE;
}
static GimpValueArray *
pdf_load (GimpProcedure *procedure,
GimpRunMode run_mode,
GFile *file,
gint width,
gint height,
GimpVectorLoadData extracted_data,
GimpMetadata *metadata,
GimpMetadataLoadFlags *flags,
GimpProcedureConfig *config,
gpointer data_from_extract,
gpointer run_data)
{
GimpValueArray *return_vals;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpImage *image = NULL;
PopplerDocument *doc = POPPLER_DOCUMENT (data_from_extract);
PdfSelectedPages pages = { 0, NULL };
GError *error = NULL;
gegl_init (NULL, NULL);
if (doc == NULL)
{
status = GIMP_PDB_EXECUTION_ERROR;
}
else if (run_mode == GIMP_RUN_INTERACTIVE)
{
status = load_dialog (doc, &pages, extracted_data, procedure, config);
}
else if (run_mode == GIMP_RUN_NONINTERACTIVE)
{
PopplerPage *test_page = poppler_document_get_page (doc, 0);
if (test_page)
{
GimpArray *pages_array;
const gint32 *page_numbers;
gint i;
gint doc_n_pages;
g_object_get (config, "pages", &pages_array, NULL);
page_numbers = gimp_int32_array_get_values (pages_array, &pages.n_pages);
doc_n_pages = poppler_document_get_n_pages (doc);
/* The number of imported pages may be bigger than
* the number of pages from the original document.
* Indeed it is possible to duplicate some pages
* by setting the same number several times in the
* "pages" argument.
* Not ceiling this value is *not* an error.
*/
if (pages.n_pages <= 0)
{
pages.n_pages = doc_n_pages;
pages.pages = g_new (gint, pages.n_pages);
for (i = 0; i < pages.n_pages; i++)
pages.pages[i] = i;
}
else
{
pages.pages = g_new (gint, pages.n_pages);
for (i = 0; i < pages.n_pages; i++)
{
if (page_numbers[i] >= doc_n_pages)
{
status = GIMP_PDB_EXECUTION_ERROR;
g_set_error (&error, GIMP_PLUGIN_PDF_LOAD_ERROR, 0,
/* TRANSLATORS: first argument is file name,
* second is out-of-range page number,
* third is number of pages.
* Specify order as in English if needed.
*/
ngettext ("PDF document '%1$s' has %3$d page. Page %2$d is out of range.",
"PDF document '%1$s' has %3$d pages. Page %2$d is out of range.",
doc_n_pages),
gimp_file_get_utf8_name (file),
page_numbers[i],
doc_n_pages);
break;
}
else
{
pages.pages[i] = page_numbers[i];
}
}
}
g_object_unref (test_page);
}
}
if (status == GIMP_PDB_SUCCESS)
{
GimpPageSelectorTarget target;
gboolean reverse_order;
gdouble resolution;
gboolean antialias;
gboolean white_background;
g_object_get (config,
"target", &target,
"reverse-order", &reverse_order,
"width", &width,
"height", &height,
"pixel-density", &resolution,
"antialias", &antialias,
"white-background", &white_background,
NULL);
image = load_image (doc,
file, extracted_data,
run_mode,
target,
width, height,
resolution,
antialias,
white_background,
reverse_order,
&pages);
if (image == NULL)
status = GIMP_PDB_EXECUTION_ERROR;
}
g_free (pages.pages);
return_vals = gimp_procedure_new_return_values (procedure, status, error);
if (status == GIMP_PDB_SUCCESS)
GIMP_VALUES_SET_IMAGE (return_vals, 1, image);
return return_vals;
}
static GimpValueArray *
pdf_load_thumb (GimpProcedure *procedure,
GFile *file,
gint size,
GimpProcedureConfig *config,
gpointer run_data)
{
GimpValueArray *return_vals;
gdouble width = 0;
gdouble height = 0;
gdouble scale;
GimpImage *image = NULL;
gint num_pages = 0;
PopplerDocument *doc = NULL;
cairo_surface_t *surface = NULL;
GError *error = NULL;
gegl_init (NULL, NULL);
doc = open_document (file, NULL, GIMP_RUN_NONINTERACTIVE,
NULL, NULL, &error);
if (doc)
{
PopplerPage *page = poppler_document_get_page (doc, 0);
if (page)
{
poppler_page_get_size (page, &width, &height);
g_object_unref (page);
}
num_pages = poppler_document_get_n_pages (doc);
surface = get_thumb_surface (doc, 0, size, TRUE);
g_object_unref (doc);
}
if (surface)
{
image = gimp_image_new (cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface),
GIMP_RGB);
gimp_image_undo_disable (image);
layer_from_surface (image, "thumbnail", 0, surface, 0.0, 1.0);
cairo_surface_destroy (surface);
gimp_image_undo_enable (image);
gimp_image_clean_all (image);
}
/* Thumbnail resolution: 100.0. */
scale = 100.0 / gimp_unit_get_factor (gimp_unit_point ());
width *= scale;
height *= scale;
if (! image)
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_EXECUTION_ERROR,
error);
return_vals = gimp_procedure_new_return_values (procedure,
GIMP_PDB_SUCCESS,
NULL);
GIMP_VALUES_SET_IMAGE (return_vals, 1, image);
GIMP_VALUES_SET_INT (return_vals, 2, width);
GIMP_VALUES_SET_INT (return_vals, 3, height);
GIMP_VALUES_SET_ENUM (return_vals, 4, GIMP_RGB_IMAGE);
GIMP_VALUES_SET_INT (return_vals, 5, num_pages);
return return_vals;
}
static PopplerDocument *
open_document (GFile *file,
const gchar *PDF_password,
GimpRunMode run_mode,
gdouble *width,
gdouble *height,
GError **load_error)
{
PopplerDocument *doc;
GError *error = NULL;
doc = poppler_document_new_from_gfile (file, PDF_password, NULL, &error);
if (run_mode == GIMP_RUN_INTERACTIVE)
{
GtkWidget *label;
label = gtk_label_new (_("PDF is password protected, please input the password:"));
while (error &&
error->domain == POPPLER_ERROR &&
error->code == POPPLER_ERROR_ENCRYPTED)
{
GtkWidget *vbox;
GtkWidget *dialog;
GtkWidget *entry;
gint run;
dialog = gimp_dialog_new (_("Encrypted PDF"), PLUG_IN_ROLE,
NULL, 0,
NULL, NULL,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_window_set_transient (GTK_WINDOW (dialog));
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
vbox, TRUE, TRUE, 0);
entry = gtk_entry_new ();
gtk_entry_set_visibility (GTK_ENTRY (entry), FALSE);
gtk_entry_set_activates_default (GTK_ENTRY (entry), TRUE);
gtk_container_add (GTK_CONTAINER (vbox), label);
gtk_container_add (GTK_CONTAINER (vbox), entry);
gtk_widget_show_all (dialog);
run = gimp_dialog_run (GIMP_DIALOG (dialog));
if (run == GTK_RESPONSE_OK)
{
g_clear_error (&error);
doc = poppler_document_new_from_gfile (file,
gtk_entry_get_text (GTK_ENTRY (entry)),
NULL, &error);
}
label = gtk_label_new (_("Wrong password! Please input the right one:"));
gtk_widget_destroy (dialog);
if (run == GTK_RESPONSE_CANCEL || run == GTK_RESPONSE_DELETE_EVENT)
{
break;
}
}
gtk_widget_destroy (label);
}
/* We can't g_mapped_file_unref(mapped_file) as apparently doc has
* references to data in there. No big deal, this is just a
* short-lived plug-in.
*/
if (! doc)
{
g_set_error (load_error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Could not load '%s': %s"),
gimp_file_get_utf8_name (file),
error->message);
g_error_free (error);
return NULL;
}
if (width && height)
{
gint n_pages;
n_pages = poppler_document_get_n_pages (doc);
for (gint i = 0; i < n_pages; i++)
{
PopplerPage *page;
page = poppler_document_get_page (doc, i);
poppler_page_get_size (page, width, height);
g_object_unref (page);
/* Only check the first page for the whole document size. */
break;
}
}
return doc;
}
static GimpLayer *
layer_from_surface (GimpImage *image,
const gchar *layer_name,
gint position,
cairo_surface_t *surface,
gdouble progress_start,
gdouble progress_scale)
{
GimpLayer *layer;
layer = gimp_layer_new_from_surface (image, layer_name, surface,
progress_start,
progress_start + progress_scale);
gimp_image_insert_layer (image, layer, NULL, position);
return layer;
}
static cairo_surface_t *
render_page_to_surface (PopplerPage *page,
int width,
int height,
double scale,
gboolean antialias,
gboolean white_background)
{
cairo_surface_t *surface;
cairo_t *cr;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
cr = cairo_create (surface);
cairo_save (cr);
cairo_translate (cr, 0.0, 0.0);
if (scale != 1.0)
cairo_scale (cr, scale, scale);
if (! antialias)
{
cairo_font_options_t *options = cairo_font_options_create ();
cairo_get_font_options (cr, options);
cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_NONE);
cairo_set_font_options (cr, options);
cairo_font_options_destroy (options);
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
}
poppler_page_render (page, cr);
cairo_restore (cr);
if (white_background)
{
cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OVER);
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
}
cairo_destroy (cr);
return surface;
}
#if 0
/* This is currently unused, but we'll have it here in case the military
wants it. */
static GdkPixbuf *
render_page_to_pixbuf (PopplerPage *page,
int width,
int height,
double scale)
{
GdkPixbuf *pixbuf;
cairo_surface_t *surface;
surface = render_page_to_surface (page, width, height, scale);
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
cairo_surface_destroy (surface);
return pixbuf;
}
#endif
static GimpImage *
load_image (PopplerDocument *doc,
GFile *file,
GimpVectorLoadData extracted_data,
GimpRunMode run_mode,
GimpPageSelectorTarget target,
gint doc_width,
gint doc_height,
gdouble resolution,
gboolean antialias,
gboolean white_background,
gboolean reverse_order,
PdfSelectedPages *pages)
{
GimpImage *image = NULL;
GimpImage **images = NULL;
gint i;
gdouble scale;
gdouble doc_progress = 0;
gint base_index = 0;
gint sign = 1;
if (reverse_order && pages->n_pages > 0)
{
base_index = pages->n_pages - 1;
sign = -1;
}
if (target == GIMP_PAGE_SELECTOR_TARGET_IMAGES)
images = g_new0 (GimpImage *, pages->n_pages);
gimp_progress_init_printf (_("Opening '%s'"),
gimp_file_get_utf8_name (file));
scale = (gdouble) doc_width / extracted_data.width;
/* read the file */
for (i = 0; i < pages->n_pages; i++)
{
PopplerPage *page;
gchar *page_label;
gdouble page_width;
gdouble page_height;
cairo_surface_t *surface;
gint width;
gint height;
gint page_index;
page_index = base_index + sign * i;
page = poppler_document_get_page (doc, pages->pages[page_index]);
poppler_page_get_size (page, &page_width, &page_height);
width = (gint) ceil (page_width * scale);
height = (gint) ceil (page_height * scale);
g_object_get (G_OBJECT (page), "label", &page_label, NULL);
if (! image)
{
image = gimp_image_new (doc_width, doc_height, GIMP_RGB);
gimp_image_undo_disable (image);
gimp_image_set_resolution (image, resolution, resolution);
}
surface = render_page_to_surface (page, width, height, scale,
antialias, white_background);
layer_from_surface (image, page_label, 0, surface,
doc_progress, 1.0 / pages->n_pages);
g_free (page_label);
cairo_surface_destroy (surface);
doc_progress = (double) (i + 1) / pages->n_pages;
gimp_progress_update (doc_progress);
if (target == GIMP_PAGE_SELECTOR_TARGET_IMAGES)
{
images[i] = image;
gimp_image_undo_enable (image);
gimp_image_clean_all (image);
image = 0;
}
}
gimp_progress_update (1.0);
if (image)
{
gimp_image_undo_enable (image);
gimp_image_clean_all (image);
}
if (target == GIMP_PAGE_SELECTOR_TARGET_IMAGES)
{
if (run_mode != GIMP_RUN_NONINTERACTIVE)
{
/* Display images in reverse order. The last will be
* displayed by GIMP itself
*/
for (i = pages->n_pages - 1; i > 0; i--)
gimp_display_new (images[i]);
}
image = images[0];
g_free (images);
}
return image;
}
static cairo_surface_t *
get_thumb_surface (PopplerDocument *doc,
gint page_num,
gint preferred_size,
gboolean white_background)
{
PopplerPage *page;
cairo_surface_t *surface;
page = poppler_document_get_page (doc, page_num);
if (! page)
return NULL;
surface = poppler_page_get_thumbnail (page);
if (! surface)
{
gdouble width;
gdouble height;
gdouble scale;
poppler_page_get_size (page, &width, &height);
scale = (gdouble) preferred_size / MAX (width, height);
width *= scale;
height *= scale;
surface = render_page_to_surface (page, width, height, scale, TRUE, white_background);
}
g_object_unref (page);
return surface;
}
static GdkPixbuf *
get_thumb_pixbuf (PopplerDocument *doc,
gint page_num,
gint preferred_size,
gboolean white_background)
{
cairo_surface_t *surface;
GdkPixbuf *pixbuf;
surface = get_thumb_surface (doc, page_num, preferred_size, white_background);
pixbuf = gdk_pixbuf_get_from_surface (surface, 0, 0,
cairo_image_surface_get_width (surface),
cairo_image_surface_get_height (surface));
cairo_surface_destroy (surface);
return pixbuf;
}
typedef struct
{
PopplerDocument *document;
GimpPageSelector *selector;
gboolean white_background;
GMutex mutex;
GCond render_thumb;
gboolean stop_thumbnailing;
gboolean render_thumbnails;
} ThreadData;
typedef struct
{
GimpPageSelector *selector;
gint page_no;
GdkPixbuf *pixbuf;
} IdleData;
static gboolean
idle_set_thumbnail (gpointer data)
{
IdleData *idle_data = data;
gimp_page_selector_set_page_thumbnail (idle_data->selector,
idle_data->page_no,
idle_data->pixbuf);
g_object_unref (idle_data->pixbuf);
g_free (idle_data);
return FALSE;
}
static gpointer
thumbnail_thread (gpointer data)
{
ThreadData *thread_data = data;
gboolean first_loop = TRUE;
gint n_pages;
gint i;
n_pages = poppler_document_get_n_pages (thread_data->document);
while (TRUE)
{
gboolean white_background;
gboolean stop_thumbnailing;
gboolean render_thumbnails;
g_mutex_lock (&thread_data->mutex);
if (first_loop)
first_loop = FALSE;
else
g_cond_wait (&thread_data->render_thumb, &thread_data->mutex);
stop_thumbnailing = thread_data->stop_thumbnailing;
g_mutex_unlock (&thread_data->mutex);
if (stop_thumbnailing)
break;
g_mutex_lock (&thread_data->mutex);
render_thumbnails = thread_data->render_thumbnails;
white_background = thread_data->white_background;
thread_data->render_thumbnails = FALSE;
g_mutex_unlock (&thread_data->mutex);
/* This handles "spurious wakeup", i.e. cases when g_cond_wait() returned
* even though there was no call asking us to re-render the thumbnails.
* See docs of g_cond_wait().
*/
if (! render_thumbnails)
continue;
for (i = 0; i < n_pages; i++)
{
IdleData *idle_data = g_new0 (IdleData, 1);
gboolean white_background2;
idle_data->selector = thread_data->selector;
idle_data->page_no = i;
/* FIXME get preferred size from somewhere? */
idle_data->pixbuf = get_thumb_pixbuf (thread_data->document, i,
THUMBNAIL_SIZE,
white_background);
g_idle_add (idle_set_thumbnail, idle_data);
g_mutex_lock (&thread_data->mutex);
white_background2 = thread_data->white_background;
stop_thumbnailing = thread_data->stop_thumbnailing;
g_mutex_unlock (&thread_data->mutex);
if (stop_thumbnailing || white_background2 != white_background)
break;
}
if (stop_thumbnailing)
break;
}
return NULL;
}
static void
white_background_toggled (GtkToggleButton *widget,
ThreadData *thread_data)
{
g_mutex_lock (&thread_data->mutex);
thread_data->white_background = gtk_toggle_button_get_active (widget);
thread_data->render_thumbnails = TRUE;
g_cond_signal (&thread_data->render_thumb);
g_mutex_unlock (&thread_data->mutex);
}
static GimpPDBStatusType
load_dialog (PopplerDocument *doc,
PdfSelectedPages *pages,
GimpVectorLoadData extracted_data,
GimpProcedure *procedure,
GimpProcedureConfig *config)
{
GtkWidget *dialog;
GtkWidget *vbox;
GtkWidget *title;
GtkWidget *selector;
GtkWidget *white_bg;
ThreadData thread_data;
GThread *thread;
gint i;
gint n_pages;
gboolean run;
GimpPageSelectorTarget target;
gboolean white_background;
n_pages = poppler_document_get_n_pages (doc);
dialog = gimp_vector_load_procedure_dialog_new (GIMP_VECTOR_LOAD_PROCEDURE (procedure),
GIMP_PROCEDURE_CONFIG (config),
&extracted_data, NULL);
g_object_get (config,
"target", &target,
"white-background", &white_background,
NULL);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
/* Title */
title = gimp_prop_label_new (G_OBJECT (doc), "title");
gtk_label_set_ellipsize (GTK_LABEL (title), PANGO_ELLIPSIZE_END);
gtk_box_pack_start (GTK_BOX (vbox), title, FALSE, FALSE, 0);
/* Page Selector */
selector = gimp_page_selector_new ();
gtk_widget_set_size_request (selector, 380, 360);
gtk_box_pack_start (GTK_BOX (vbox), selector, TRUE, TRUE, 0);
gtk_widget_show (selector);
if (n_pages <= 0)
{
g_message (_("Error getting number of pages from the given PDF file."));
return GIMP_PDB_EXECUTION_ERROR;
}
gimp_page_selector_set_n_pages (GIMP_PAGE_SELECTOR (selector), n_pages);
gimp_page_selector_set_target (GIMP_PAGE_SELECTOR (selector),
target);
for (i = 0; i < n_pages; i++)
{
PopplerPage *page;
gchar *label;
page = poppler_document_get_page (doc, i);
g_object_get (G_OBJECT (page), "label", &label, NULL);
gimp_page_selector_set_page_label (GIMP_PAGE_SELECTOR (selector), i,
label);
g_object_unref (page);
g_free (label);
}
/* Since selecting none will be equivalent to selecting all, this is
* only useful as a feedback for the default behavior of selecting all
* pages. */
gimp_page_selector_select_all (GIMP_PAGE_SELECTOR (selector));
g_signal_connect_swapped (selector, "activate",
G_CALLBACK (gtk_window_activate_default),
dialog);
thread_data.document = doc;
thread_data.selector = GIMP_PAGE_SELECTOR (selector);
thread_data.render_thumbnails = TRUE;
thread_data.stop_thumbnailing = FALSE;
thread_data.white_background = white_background;
g_mutex_init (&thread_data.mutex);
g_cond_init (&thread_data.render_thumb);
thread = g_thread_new ("thumbnailer", thumbnail_thread, &thread_data);
gimp_procedure_dialog_fill (GIMP_PROCEDURE_DIALOG (dialog),
"reverse-order",
NULL);
white_bg = gimp_procedure_dialog_get_widget (GIMP_PROCEDURE_DIALOG (dialog),
"white-background", G_TYPE_NONE);
g_signal_connect (white_bg, "toggled",
G_CALLBACK (white_background_toggled), &thread_data);
gimp_procedure_dialog_fill (GIMP_PROCEDURE_DIALOG (dialog),
"antialias",
"white-background",
NULL);
run = gimp_procedure_dialog_run (GIMP_PROCEDURE_DIALOG (dialog));
target = gimp_page_selector_get_target (GIMP_PAGE_SELECTOR (selector));
g_object_set (config,
"target", target,
NULL);
pages->pages =
gimp_page_selector_get_selected_pages (GIMP_PAGE_SELECTOR (selector),
(gint *) &pages->n_pages);
/* select all if none selected */
if (pages->n_pages == 0)
{
gimp_page_selector_select_all (GIMP_PAGE_SELECTOR (selector));
pages->pages =
gimp_page_selector_get_selected_pages (GIMP_PAGE_SELECTOR (selector),
(gint *) &pages->n_pages);
}
/* cleanup */
g_mutex_lock (&thread_data.mutex);
thread_data.stop_thumbnailing = TRUE;
g_cond_signal (&thread_data.render_thumb);
g_mutex_unlock (&thread_data.mutex);
g_thread_join (thread);
g_mutex_clear (&thread_data.mutex);
g_cond_clear (&thread_data.render_thumb);
/* XXX Unsure why, I get some CRITICALs when destroying the dialog, unless I
* unselect all first.
*/
gimp_page_selector_unselect_all (GIMP_PAGE_SELECTOR (selector));
gtk_widget_destroy (dialog);
return run ? GIMP_PDB_SUCCESS : GIMP_PDB_CANCEL;
}
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