gtkprintbackendfile.c

来自「This GTK+ version 2.12.3. GTK+ is a mult」· C语言 代码 · 共 700 行 · 第 1/2 页

/* 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#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 <glib/gi18n-lib.h>

#include "gtkprintoperation.h"

#include "gtkprintbackend.h"
#include "gtkprintbackendfile.h"

#include "gtkprinter.h"
#include "gtkprinter-private.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

static GType print_backend_file_type = 0;

struct _GtkPrintBackendFileClass
{
  GtkPrintBackendClass parent_class;
};

struct _GtkPrintBackendFile
{
  GtkPrintBackend parent_instance;
};

typedef enum
{
  FORMAT_PDF,
  FORMAT_PS,
  N_FORMATS
} OutputFormat;

static const gchar* formats[N_FORMATS] =
{
  "pdf",
  "ps"
};

static GObjectClass *backend_parent_class;

static void                 gtk_print_backend_file_class_init      (GtkPrintBackendFileClass *class);
static void                 gtk_print_backend_file_init            (GtkPrintBackendFile      *impl);
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,
								    gdouble                  width,
								    gdouble                  height,
								    GIOChannel              *cache_io);

static GList *              file_printer_list_papers               (GtkPrinter              *printer);

static void
gtk_print_backend_file_register_type (GTypeModule *module)
{
  static const GTypeInfo print_backend_file_info =
  {
    sizeof (GtkPrintBackendFileClass),
    NULL,		/* base_init */
    NULL,		/* base_finalize */
    (GClassInitFunc) gtk_print_backend_file_class_init,
    NULL,		/* class_finalize */
    NULL,		/* class_data */
    sizeof (GtkPrintBackendFile),
    0,		/* n_preallocs */
    (GInstanceInitFunc) gtk_print_backend_file_init,
  };

  print_backend_file_type = g_type_module_register_type (module,
                                                         GTK_TYPE_PRINT_BACKEND,
                                                         "GtkPrintBackendFile",
                                                         &print_backend_file_info, 0);
}

G_MODULE_EXPORT void 
pb_module_init (GTypeModule *module)
{
  gtk_print_backend_file_register_type (module);
}

G_MODULE_EXPORT void 
pb_module_exit (void)
{

}
  
G_MODULE_EXPORT GtkPrintBackend * 
pb_module_create (void)
{
  return gtk_print_backend_file_new ();
}

/*
 * GtkPrintBackendFile
 */
GType
gtk_print_backend_file_get_type (void)
{
  return print_backend_file_type;
}

/**
 * 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
 *
 * Return value: 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;
}

/* return N_FORMATS if no explicit format in the settings */
static OutputFormat
format_from_settings (GtkPrintSettings *settings)
{
  const gchar *value;
  gint 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 gchar *
output_file_from_settings (GtkPrintSettings *settings,
			   const gchar      *default_format)
{
  gchar *uri = NULL;
  
  if (settings)
    uri = g_strdup (gtk_print_settings_get (settings, GTK_PRINT_SETTINGS_OUTPUT_URI));

  if (uri == NULL)
    { 
      const gchar *extension;
      gchar *name, *locale_name, *path;

      if (default_format)
        extension = default_format;
      else
        {
          OutputFormat format;

          format = format_from_settings (settings);
          extension = format == FORMAT_PS ? "ps" : "pdf";
        }
 
      /* default filename used for print-to-file */ 
      name = g_strdup_printf (_("output.%s"), extension);
      locale_name = g_filename_from_utf8 (name, -1, NULL, NULL, NULL);
      g_free (name);

      if (locale_name != NULL)
        {
          path = g_build_filename (g_get_current_dir (), locale_name, NULL);
          g_free (locale_name);

          uri = g_filename_to_uri (path, NULL, NULL);
          g_free (path);
	}
    }

  return uri;
}

static cairo_status_t
_cairo_write (void                *closure,
              const unsigned char *data,
              unsigned int         length)
{
  GIOChannel *io = (GIOChannel *)closure;
  gsize written;
  GError *error;

  error = NULL;

  GTK_NOTE (PRINTING,
            g_print ("FILE Backend: Writting %i byte chunk to temp file\n", length));

  while (length > 0) 
    {
      g_io_channel_write_chars (io, (const gchar *) data, length, &written, &error);

      if (error != NULL)
	{
	  GTK_NOTE (PRINTING,
                     g_print ("FILE Backend: Error writting to temp file, %s\n", error->message));

          g_error_free (error);
	  return CAIRO_STATUS_WRITE_ERROR;
	}    

      GTK_NOTE (PRINTING,
                g_print ("FILE Backend: Wrote %i bytes to temp file\n", written));
      
      data += written;
      length -= written;
    }

  return CAIRO_STATUS_SUCCESS;
}


static cairo_surface_t *
file_printer_create_cairo_surface (GtkPrinter       *printer,
				   GtkPrintSettings *settings,
				   gdouble           width, 
				   gdouble           height,
				   GIOChannel       *cache_io)
{
  cairo_surface_t *surface;
  OutputFormat format;

  format = format_from_settings (settings);

  if (format == FORMAT_PS)
    surface = cairo_ps_surface_create_for_stream (_cairo_write, cache_io, width, height);
  else
    surface = cairo_pdf_surface_create_for_stream (_cairo_write, cache_io, width, height);

  /* TODO: DPI from settings object? */
  cairo_surface_set_fallback_resolution (surface, 300, 300);

  return surface;
}

typedef struct {
  GtkPrintBackend *backend;
  GtkPrintJobCompleteFunc callback;
  GtkPrintJob *job;
  GIOChannel *target_io;
  gpointer user_data;
  GDestroyNotify dnotify;
} _PrintStreamData;

static void
file_print_cb (GtkPrintBackendFile *print_backend,
               GError              *error,
               gpointer            user_data)
{
  _PrintStreamData *ps = (_PrintStreamData *) user_data;

  GDK_THREADS_ENTER ();

  if (ps->target_io != NULL)
    g_io_channel_unref (ps->target_io);

  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);

  if (ps->job)
    g_object_unref (ps->job);
 
  g_free (ps);

  GDK_THREADS_LEAVE ();
}