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Learning_GTK4_tree/modules/printbackends/gtkprintbackendfile.c

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2023-12-12 11:36:42 +01:00
/* GTK - The GIMP Toolkit
* gtkprintbackendfile.c: Default implementation of GtkPrintBackend
* for printing to a file
* Copyright (C) 2003, Red Hat, Inc.
*
* 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 2 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 <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <cairo.h>
#include <cairo-pdf.h>
#include <cairo-ps.h>
#include <cairo-svg.h>
#include <glib/gi18n-lib.h>
#include "gtk/gtk.h"
#include "gtk/print/gtkprinterprivate.h"
#include "gtk/gtkprivate.h"
#include "gtkprintbackendfile.h"
typedef struct _GtkPrintBackendFileClass GtkPrintBackendFileClass;
#define GTK_PRINT_BACKEND_FILE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_PRINT_BACKEND_FILE, GtkPrintBackendFileClass))
#define GTK_IS_PRINT_BACKEND_FILE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_PRINT_BACKEND_FILE))
#define GTK_PRINT_BACKEND_FILE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_PRINT_BACKEND_FILE, GtkPrintBackendFileClass))
#define _STREAM_MAX_CHUNK_SIZE 8192
struct _GtkPrintBackendFileClass
{
GtkPrintBackendClass parent_class;
};
struct _GtkPrintBackendFile
{
GtkPrintBackend parent_instance;
};
typedef enum
{
FORMAT_PDF,
FORMAT_PS,
FORMAT_SVG,
N_FORMATS
} OutputFormat;
static const char * formats[N_FORMATS] =
{
"pdf",
"ps",
"svg"
};
static GObjectClass *backend_parent_class;
static void file_printer_get_settings_from_options (GtkPrinter *printer,
GtkPrinterOptionSet *options,
GtkPrintSettings *settings);
static GtkPrinterOptionSet *file_printer_get_options (GtkPrinter *printer,
GtkPrintSettings *settings,
GtkPageSetup *page_setup,
GtkPrintCapabilities capabilities);
static void file_printer_prepare_for_print (GtkPrinter *printer,
GtkPrintJob *print_job,
GtkPrintSettings *settings,
GtkPageSetup *page_setup);
static void gtk_print_backend_file_print_stream (GtkPrintBackend *print_backend,
GtkPrintJob *job,
GIOChannel *data_io,
GtkPrintJobCompleteFunc callback,
gpointer user_data,
GDestroyNotify dnotify);
static cairo_surface_t * file_printer_create_cairo_surface (GtkPrinter *printer,
GtkPrintSettings *settings,
double width,
double height,
GIOChannel *cache_io);
static GList * file_printer_list_papers (GtkPrinter *printer);
static GtkPageSetup * file_printer_get_default_page_size (GtkPrinter *printer);
G_DEFINE_DYNAMIC_TYPE(GtkPrintBackendFile, gtk_print_backend_file, GTK_TYPE_PRINT_BACKEND)
G_MODULE_EXPORT
void
g_io_module_load (GIOModule *module)
{
g_type_module_use (G_TYPE_MODULE (module));
gtk_print_backend_file_register_type (G_TYPE_MODULE (module));
g_io_extension_point_implement (GTK_PRINT_BACKEND_EXTENSION_POINT_NAME,
GTK_TYPE_PRINT_BACKEND_FILE,
"file",
10);
}
G_MODULE_EXPORT
void
g_io_module_unload (GIOModule *module)
{
}
G_MODULE_EXPORT
char **
g_io_module_query (void)
{
char *eps[] = {
(char *)GTK_PRINT_BACKEND_EXTENSION_POINT_NAME,
NULL
};
return g_strdupv (eps);
}
/**
* gtk_print_backend_file_new:
*
* Creates a new #GtkPrintBackendFile object. #GtkPrintBackendFile
* implements the #GtkPrintBackend interface with direct access to
* the filesystem using Unix/Linux API calls
*
* Returns: the new #GtkPrintBackendFile object
**/
GtkPrintBackend *
gtk_print_backend_file_new (void)
{
return g_object_new (GTK_TYPE_PRINT_BACKEND_FILE, NULL);
}
static void
gtk_print_backend_file_class_init (GtkPrintBackendFileClass *class)
{
GtkPrintBackendClass *backend_class = GTK_PRINT_BACKEND_CLASS (class);
backend_parent_class = g_type_class_peek_parent (class);
backend_class->print_stream = gtk_print_backend_file_print_stream;
backend_class->printer_create_cairo_surface = file_printer_create_cairo_surface;
backend_class->printer_get_options = file_printer_get_options;
backend_class->printer_get_settings_from_options = file_printer_get_settings_from_options;
backend_class->printer_prepare_for_print = file_printer_prepare_for_print;
backend_class->printer_list_papers = file_printer_list_papers;
backend_class->printer_get_default_page_size = file_printer_get_default_page_size;
}
static void
gtk_print_backend_file_class_finalize (GtkPrintBackendFileClass *class)
{
}
/* return N_FORMATS if no explicit format in the settings */
static OutputFormat
format_from_settings (GtkPrintSettings *settings)
{
const char *value;
int i;
if (settings == NULL)
return N_FORMATS;
value = gtk_print_settings_get (settings,
GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT);
if (value == NULL)
return N_FORMATS;
for (i = 0; i < N_FORMATS; ++i)
if (strcmp (value, formats[i]) == 0)
break;
g_assert (i < N_FORMATS);
return (OutputFormat) i;
}
static char *
output_file_from_settings (GtkPrintSettings *settings,
const char *default_format)
{
char *uri = NULL;
if (settings)
uri = g_strdup (gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_URI));
if (uri == NULL)
{
const char *extension, *basename = NULL, *output_dir = NULL;
char *name, *locale_name, *path;
if (default_format)
extension = default_format;
else
{
OutputFormat format;
format = format_from_settings (settings);
switch (format)
{
default:
case N_FORMATS:
case FORMAT_PDF:
extension = "pdf";
break;
case FORMAT_PS:
extension = "ps";
break;
case FORMAT_SVG:
extension = "svg";
break;
}
}
if (settings)
basename = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_BASENAME);
if (basename == NULL)
basename = _("output");
name = g_strconcat (basename, ".", extension, NULL);
locale_name = g_filename_from_utf8 (name, -1, NULL, NULL, NULL);
g_free (name);
if (locale_name != NULL)
{
if (settings)
output_dir = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_DIR);
if (output_dir == NULL)
{
const char *document_dir = g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS);
if (document_dir == NULL)
{
char *current_dir = g_get_current_dir ();
path = g_build_filename (current_dir, locale_name, NULL);
g_free (current_dir);
}
else
path = g_build_filename (document_dir, locale_name, NULL);
uri = g_filename_to_uri (path, NULL, NULL);
}
else
{
path = g_build_filename (output_dir, locale_name, NULL);
uri = g_filename_to_uri (path, NULL, NULL);
}
g_free (path);
g_free (locale_name);
}
}
return uri;
}
static cairo_status_t
_cairo_write (void *closure,
const unsigned char *data,
unsigned int length)
{
GIOChannel *io = (GIOChannel *)closure;
gsize written = 0;
GError *error;
error = NULL;
GTK_DEBUG (PRINTING, "FILE Backend: Writing %u byte chunk to temp file", length);
while (length > 0)
{
GIOStatus status;
status = g_io_channel_write_chars (io, (const char *) data, length, &written, &error);
if (status == G_IO_STATUS_ERROR)
{
if (error != NULL)
{
GTK_DEBUG (PRINTING, "FILE Backend: Error writing to temp file, %s", error->message);
g_error_free (error);
}
return CAIRO_STATUS_WRITE_ERROR;
}
GTK_DEBUG (PRINTING, "FILE Backend: Wrote %zd bytes to temp file", written);
data += written;
length -= written;
}
return CAIRO_STATUS_SUCCESS;
}
static cairo_surface_t *
file_printer_create_cairo_surface (GtkPrinter *printer,
GtkPrintSettings *settings,
double width,
double height,
GIOChannel *cache_io)
{
cairo_surface_t *surface;
OutputFormat format;
const cairo_svg_version_t *versions;
int num_versions = 0;
format = format_from_settings (settings);
switch (format)
{
default:
case N_FORMATS:
case FORMAT_PDF:
surface = cairo_pdf_surface_create_for_stream (_cairo_write, cache_io, width, height);
break;
case FORMAT_PS:
surface = cairo_ps_surface_create_for_stream (_cairo_write, cache_io, width, height);
break;
case FORMAT_SVG:
surface = cairo_svg_surface_create_for_stream (_cairo_write, cache_io, width, height);
cairo_svg_get_versions (&versions, &num_versions);
if (num_versions > 0)
cairo_svg_surface_restrict_to_version (surface, versions[num_versions - 1]);
break;
}
cairo_surface_set_fallback_resolution (surface,
2.0 * gtk_print_settings_get_printer_lpi (settings),
2.0 * gtk_print_settings_get_printer_lpi (settings));
return surface;
}
typedef struct {
GtkPrintBackend *backend;
GtkPrintJobCompleteFunc callback;
GtkPrintJob *job;
GFileOutputStream *target_io_stream;
gpointer user_data;
GDestroyNotify dnotify;
} _PrintStreamData;
static void
file_print_cb (GtkPrintBackendFile *print_backend,
GError *error,
gpointer user_data)
{
char *uri;
_PrintStreamData *ps = (_PrintStreamData *) user_data;
GtkRecentManager *recent_manager;
if (ps->target_io_stream != NULL)
(void)g_output_stream_close (G_OUTPUT_STREAM (ps->target_io_stream), NULL, NULL);
if (ps->callback)
ps->callback (ps->job, ps->user_data, error);
if (ps->dnotify)
ps->dnotify (ps->user_data);
gtk_print_job_set_status (ps->job,
(error != NULL)
? GTK_PRINT_STATUS_FINISHED_ABORTED
: GTK_PRINT_STATUS_FINISHED);
recent_manager = gtk_recent_manager_get_default ();
uri = output_file_from_settings (gtk_print_job_get_settings (ps->job), NULL);
gtk_recent_manager_add_item (recent_manager, uri);
g_free (uri);
if (ps->job)
g_object_unref (ps->job);
g_free (ps);
}
static gboolean
file_write (GIOChannel *source,
GIOCondition con,
gpointer user_data)
{
char buf[_STREAM_MAX_CHUNK_SIZE];
gsize bytes_read;
GError *error;
GIOStatus read_status;
_PrintStreamData *ps = (_PrintStreamData *) user_data;
error = NULL;
read_status =
g_io_channel_read_chars (source,
buf,
_STREAM_MAX_CHUNK_SIZE,
&bytes_read,
&error);
if (read_status != G_IO_STATUS_ERROR)
{
gsize bytes_written;
g_output_stream_write_all (G_OUTPUT_STREAM (ps->target_io_stream),
buf,
bytes_read,
&bytes_written,
NULL,
&error);
}
if (error != NULL || read_status == G_IO_STATUS_EOF)
{
file_print_cb (GTK_PRINT_BACKEND_FILE (ps->backend), error, user_data);
if (error != NULL)
{
GTK_DEBUG (PRINTING, "FILE Backend: %s", error->message);
g_error_free (error);
}
return FALSE;
}
GTK_DEBUG (PRINTING, "FILE Backend: Writing %"G_GSIZE_FORMAT" byte chunk to target file", bytes_read);
return TRUE;
}
static void
gtk_print_backend_file_print_stream (GtkPrintBackend *print_backend,
GtkPrintJob *job,
GIOChannel *data_io,
GtkPrintJobCompleteFunc callback,
gpointer user_data,
GDestroyNotify dnotify)
{
GError *internal_error = NULL;
_PrintStreamData *ps;
GtkPrintSettings *settings;
char *uri;
GFile *file = NULL;
settings = gtk_print_job_get_settings (job);
ps = g_new0 (_PrintStreamData, 1);
ps->callback = callback;
ps->user_data = user_data;
ps->dnotify = dnotify;
ps->job = g_object_ref (job);
ps->backend = print_backend;
internal_error = NULL;
uri = output_file_from_settings (settings, NULL);
if (uri == NULL)
goto error;
file = g_file_new_for_uri (uri);
ps->target_io_stream = g_file_replace (file, NULL, FALSE, G_FILE_CREATE_NONE, NULL, &internal_error);
g_object_unref (file);
g_free (uri);
error:
if (internal_error != NULL)
{
file_print_cb (GTK_PRINT_BACKEND_FILE (print_backend),
internal_error, ps);
g_error_free (internal_error);
return;
}
g_io_add_watch (data_io,
G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP,
(GIOFunc) file_write,
ps);
}
static void
gtk_print_backend_file_init (GtkPrintBackendFile *backend)
{
GtkPrinter *printer;
printer = g_object_new (GTK_TYPE_PRINTER,
"name", _("Print to File"),
"backend", backend,
"is-virtual", TRUE,
"accepts-pdf", TRUE,
NULL);
gtk_printer_set_has_details (printer, TRUE);
gtk_printer_set_icon_name (printer, "document-save");
gtk_printer_set_is_active (printer, TRUE);
gtk_print_backend_add_printer (GTK_PRINT_BACKEND (backend), printer);
g_object_unref (printer);
gtk_print_backend_set_list_done (GTK_PRINT_BACKEND (backend));
}
typedef struct {
GtkPrinter *printer;
GtkPrinterOptionSet *set;
} _OutputFormatChangedData;
static void
set_printer_format_from_option_set (GtkPrinter *printer,
GtkPrinterOptionSet *set)
{
GtkPrinterOption *format_option;
const char *value;
int i;
format_option = gtk_printer_option_set_lookup (set, "output-file-format");
if (format_option && format_option->value)
{
value = format_option->value;
if (value)
{
for (i = 0; i < N_FORMATS; ++i)
if (strcmp (value, formats[i]) == 0)
break;
g_assert (i < N_FORMATS);
switch (i)
{
case FORMAT_PDF:
gtk_printer_set_accepts_pdf (printer, TRUE);
gtk_printer_set_accepts_ps (printer, FALSE);
break;
case FORMAT_PS:
gtk_printer_set_accepts_pdf (printer, FALSE);
gtk_printer_set_accepts_ps (printer, TRUE);
break;
case FORMAT_SVG:
default:
gtk_printer_set_accepts_pdf (printer, FALSE);
gtk_printer_set_accepts_ps (printer, FALSE);
break;
}
}
}
}
static void
file_printer_output_file_format_changed (GtkPrinterOption *format_option,
gpointer user_data)
{
GtkPrinterOption *uri_option;
char *base = NULL;
_OutputFormatChangedData *data = (_OutputFormatChangedData *) user_data;
if (! format_option->value)
return;
uri_option = gtk_printer_option_set_lookup (data->set,
"gtk-main-page-custom-input");
if (uri_option && uri_option->value)
{
const char *uri = uri_option->value;
const char *dot = strrchr (uri, '.');
if (dot)
{
int i;
/* check if the file extension matches one of the known ones */
for (i = 0; i < N_FORMATS; i++)
if (strcmp (dot + 1, formats[i]) == 0)
break;
if (i < N_FORMATS && strcmp (formats[i], format_option->value))
{
/* the file extension is known but doesn't match the
* selected one, strip it away
*/
base = g_strndup (uri, dot - uri);
}
}
else
{
/* there's no file extension */
base = g_strdup (uri);
}
}
if (base)
{
char *tmp = g_strdup_printf ("%s.%s", base, format_option->value);
gtk_printer_option_set (uri_option, tmp);
g_free (tmp);
g_free (base);
}
set_printer_format_from_option_set (data->printer, data->set);
}
static GtkPrinterOptionSet *
file_printer_get_options (GtkPrinter *printer,
GtkPrintSettings *settings,
GtkPageSetup *page_setup,
GtkPrintCapabilities capabilities)
{
GtkPrinterOptionSet *set;
GtkPrinterOption *option;
const char *n_up[] = {"1", "2", "4", "6", "9", "16" };
const char *pages_per_sheet = NULL;
const char *format_names[N_FORMATS] = { N_("PDF"), N_("PostScript"), N_("SVG") };
const char *supported_formats[N_FORMATS];
const char *display_format_names[N_FORMATS];
int n_formats = 0;
OutputFormat format;
char *uri;
int current_format = 0;
_OutputFormatChangedData *format_changed_data;
format = format_from_settings (settings);
set = gtk_printer_option_set_new ();
option = gtk_printer_option_new ("gtk-n-up", _("Pages per _sheet:"), GTK_PRINTER_OPTION_TYPE_PICKONE);
gtk_printer_option_choices_from_array (option, G_N_ELEMENTS (n_up),
n_up, n_up /* FIXME i18n (localised digits)! */);
if (settings)
pages_per_sheet = gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_NUMBER_UP);
if (pages_per_sheet)
gtk_printer_option_set (option, pages_per_sheet);
else
gtk_printer_option_set (option, "1");
gtk_printer_option_set_add (set, option);
g_object_unref (option);
if (capabilities & (GTK_PRINT_CAPABILITY_GENERATE_PDF | GTK_PRINT_CAPABILITY_GENERATE_PS))
{
if (capabilities & GTK_PRINT_CAPABILITY_GENERATE_PDF)
{
if (format == FORMAT_PDF || format == N_FORMATS)
{
format = FORMAT_PDF;
current_format = n_formats;
}
supported_formats[n_formats] = formats[FORMAT_PDF];
display_format_names[n_formats] = _(format_names[FORMAT_PDF]);
n_formats++;
}
if (capabilities & GTK_PRINT_CAPABILITY_GENERATE_PS)
{
if (format == FORMAT_PS || format == N_FORMATS)
current_format = n_formats;
supported_formats[n_formats] = formats[FORMAT_PS];
display_format_names[n_formats] = _(format_names[FORMAT_PS]);
n_formats++;
}
}
else
{
switch (format)
{
default:
case N_FORMATS:
case FORMAT_PDF:
current_format = FORMAT_PDF;
break;
case FORMAT_PS:
current_format = FORMAT_PS;
break;
case FORMAT_SVG:
current_format = FORMAT_SVG;
break;
}
for (n_formats = 0; n_formats < N_FORMATS; ++n_formats)
{
supported_formats[n_formats] = formats[n_formats];
display_format_names[n_formats] = _(format_names[n_formats]);
}
}
uri = output_file_from_settings (settings, supported_formats[current_format]);
option = gtk_printer_option_new ("gtk-main-page-custom-input", _("File"),
GTK_PRINTER_OPTION_TYPE_FILESAVE);
gtk_printer_option_set_activates_default (option, TRUE);
gtk_printer_option_set (option, uri);
g_free (uri);
option->group = g_strdup ("GtkPrintDialogExtension");
gtk_printer_option_set_add (set, option);
if (n_formats > 1)
{
option = gtk_printer_option_new ("output-file-format", _("_Output format"),
GTK_PRINTER_OPTION_TYPE_ALTERNATIVE);
option->group = g_strdup ("GtkPrintDialogExtension");
gtk_printer_option_choices_from_array (option, n_formats,
supported_formats,
display_format_names);
gtk_printer_option_set (option, supported_formats[current_format]);
gtk_printer_option_set_add (set, option);
set_printer_format_from_option_set (printer, set);
format_changed_data = g_new (_OutputFormatChangedData, 1);
format_changed_data->printer = printer;
format_changed_data->set = set;
g_signal_connect_data (option, "changed",
G_CALLBACK (file_printer_output_file_format_changed),
format_changed_data, (GClosureNotify)g_free, 0);
g_object_unref (option);
}
return set;
}
static void
file_printer_get_settings_from_options (GtkPrinter *printer,
GtkPrinterOptionSet *options,
GtkPrintSettings *settings)
{
GtkPrinterOption *option;
option = gtk_printer_option_set_lookup (options, "gtk-main-page-custom-input");
gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_OUTPUT_URI, option->value);
option = gtk_printer_option_set_lookup (options, "output-file-format");
if (option)
gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT, option->value);
option = gtk_printer_option_set_lookup (options, "gtk-n-up");
if (option)
gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_NUMBER_UP, option->value);
option = gtk_printer_option_set_lookup (options, "gtk-n-up-layout");
if (option)
gtk_print_settings_set (settings, GTK_PRINT_SETTINGS_NUMBER_UP_LAYOUT, option->value);
}
static void
file_printer_prepare_for_print (GtkPrinter *printer,
GtkPrintJob *print_job,
GtkPrintSettings *settings,
GtkPageSetup *page_setup)
{
double scale;
GtkPrintPages pages;
GtkPageRange *ranges;
int n_ranges;
OutputFormat format;
pages = gtk_print_settings_get_print_pages (settings);
gtk_print_job_set_pages (print_job, pages);
if (pages == GTK_PRINT_PAGES_RANGES)
ranges = gtk_print_settings_get_page_ranges (settings, &n_ranges);
else
{
ranges = NULL;
n_ranges = 0;
}
gtk_print_job_set_page_ranges (print_job, ranges, n_ranges);
gtk_print_job_set_collate (print_job, gtk_print_settings_get_collate (settings));
gtk_print_job_set_reverse (print_job, gtk_print_settings_get_reverse (settings));
gtk_print_job_set_num_copies (print_job, gtk_print_settings_get_n_copies (settings));
gtk_print_job_set_n_up (print_job, gtk_print_settings_get_number_up (settings));
gtk_print_job_set_n_up_layout (print_job, gtk_print_settings_get_number_up_layout (settings));
scale = gtk_print_settings_get_scale (settings);
if (scale != 100.0)
gtk_print_job_set_scale (print_job, scale / 100.0);
gtk_print_job_set_page_set (print_job, gtk_print_settings_get_page_set (settings));
format = format_from_settings (settings);
switch (format)
{
case FORMAT_PDF:
case N_FORMATS:
gtk_print_job_set_rotate (print_job, FALSE);
break;
default:
case FORMAT_PS:
case FORMAT_SVG:
gtk_print_job_set_rotate (print_job, TRUE);
break;
}
}
static GList *
file_printer_list_papers (GtkPrinter *printer)
{
GList *result = NULL;
GList *papers, *p;
GtkPageSetup *page_setup;
papers = gtk_paper_size_get_paper_sizes (FALSE);
for (p = papers; p; p = p->next)
{
GtkPaperSize *paper_size = p->data;
page_setup = gtk_page_setup_new ();
gtk_page_setup_set_paper_size (page_setup, paper_size);
gtk_paper_size_free (paper_size);
result = g_list_prepend (result, page_setup);
}
g_list_free (papers);
return g_list_reverse (result);
}
static GtkPageSetup *
file_printer_get_default_page_size (GtkPrinter *printer)
{
GtkPageSetup *result = NULL;
return result;
}