pdf/xpdf/pdf-document.cc

   1 /* pdfdocument.h: Implementation of EvDocument for PDF
   2  * Copyright (C) 2004, Red Hat, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #include "gpdf-g-switch.h"
  20 #include "pdf-document.h"
  21 #include "gpdf-g-switch.h"
  22
  23 #include "GlobalParams.h"
  24 #include "GDKSplashOutputDev.h"
  25 #include "PDFDoc.h"
  26
  27 typedef struct _PdfDocumentClass PdfDocumentClass;
  28
  29 #define PDF_DOCUMENT_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), PDF_TYPE_DOCUMENT, PdfDocumentClass))
  30 #define PDF_IS_DOCUMENT_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), PDF_TYPE_DOCUMENT))
  31 #define PDF_DOCUMENT_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), PDF_TYPE_DOCUMENT, PdfDocumentClass))
  32
  33 struct _PdfDocumentClass
  34 {
  35         GObjectClass parent_class;
  36 };
  37
  38 struct _PdfDocument
  39 {
  40         GObject parent_instance;
  41
  42         int page;
  43         int page_x_offset;
  44         int page_y_offset;
  45         double scale;
  46         GdkDrawable *target;
  47
  48         GDKSplashOutputDev *out;
  49         PDFDoc *doc;
  50
  51         gboolean page_valid;
  52 };
  53
  54 static void pdf_document_document_iface_init (EvDocumentIface *iface);
  55
  56 G_DEFINE_TYPE_WITH_CODE (PdfDocument, pdf_document, G_TYPE_OBJECT,
  57                          { G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT,
  58                                                   pdf_document_document_iface_init) });
  59
  60 static gboolean
  61 document_validate_page (PdfDocument *pdf_document)
  62 {
  63         if (!pdf_document->page_valid) {
  64                 pdf_document->doc->displayPage (pdf_document->out, pdf_document->page,
  65                                                 72 * pdf_document->scale,
  66                                                 72 * pdf_document->scale,
  67                                                 0, gTrue, gTrue);
  68
  69                 pdf_document->page_valid = TRUE;
  70         }
  71 }
  72
  73 static gboolean
  74 pdf_document_load (EvDocument  *document,
  75                    const char  *uri,
  76                    GError     **error)
  77 {
  78         PdfDocument *pdf_document = PDF_DOCUMENT (document);
  79         PDFDoc *newDoc;
  80         int err;
  81         char *filename;
  82         GString *filename_g;
  83
  84         if (!globalParams) {
  85                 globalParams = new GlobalParams("/etc/xpdfrc");
  86                 globalParams->setupBaseFonts(NULL);
  87         }
  88
  89         filename = g_filename_from_uri (uri, NULL, error);
  90         if (!filename)
  91                 return FALSE;
  92
  93         filename_g = new GString (filename);
  94         g_free (filename);
  95
  96         // open the PDF file, assumes ownership of filename_g
  97         newDoc = new PDFDoc(filename_g, 0, 0);
  98
  99         if (!newDoc->isOk()) {
 100                 err = newDoc->getErrorCode();
 101                 delete newDoc;
 102
 103                 /* FIXME: Add a real error enum to EvDocument */
 104                 g_set_error (error, G_FILE_ERROR,
 105                              G_FILE_ERROR_FAILED,
 106                              "Failed to load document (error %d) '%s'\n",
 107                              err,
 108                              uri);
 109
 110                 return FALSE;
 111         }
 112
 113         if (pdf_document->doc)
 114                 delete pdf_document->doc;
 115         pdf_document->doc = newDoc;
 116
 117         pdf_document->page = 1;
 118
 119         if (pdf_document->out)
 120                 pdf_document->out->startDoc(pdf_document->doc->getXRef());
 121
 122         pdf_document->page_valid = FALSE;
 123
 124         return TRUE;
 125 }
 126
 127 static int
 128 pdf_document_get_n_pages (EvDocument  *document)
 129 {
 130         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 131
 132         if (pdf_document->doc)
 133                 return pdf_document->doc->getNumPages();
 134         else
 135                 return 1;
 136 }
 137
 138 static void
 139 pdf_document_set_page (EvDocument  *document,
 140                        int          page)
 141 {
 142         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 143
 144         if (page != pdf_document->page) {
 145                 pdf_document->page = page;
 146                 pdf_document->page_valid = FALSE;
 147         }
 148
 149 }
 150
 151 static void
 152 redraw_callback (void *data)
 153 {
 154         /* Need to hook up through a EvDocument callback? */
 155 }
 156
 157 static void
 158 pdf_document_set_target (EvDocument  *document,
 159                          GdkDrawable *target)
 160 {
 161         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 162
 163         if (pdf_document->target != target) {
 164                 if (pdf_document->target)
 165                         g_object_unref (pdf_document->target);
 166
 167                 pdf_document->target = target;
 168
 169                 if (pdf_document->target)
 170                         g_object_ref (pdf_document->target);
 171
 172                 if (pdf_document->out) {
 173                         delete pdf_document->out;
 174                         pdf_document->out = NULL;
 175                 }
 176
 177                 if (pdf_document->target) {
 178                         pdf_document->out = new GDKSplashOutputDev (gdk_drawable_get_screen (pdf_document->target),
 179                                                          redraw_callback, (void*) document);
 180
 181                         if (pdf_document->doc)
 182                                 pdf_document->out->startDoc(pdf_document->doc->getXRef());
 183
 184                 }
 185
 186                 pdf_document->page_valid = FALSE;
 187         }
 188 }
 189
 190 static void
 191 pdf_document_set_scale (EvDocument  *document,
 192                         double       scale)
 193 {
 194         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 195
 196         if (pdf_document->scale != scale) {
 197                 pdf_document->scale = scale;
 198                 pdf_document->page_valid = FALSE;
 199         }
 200 }
 201
 202 static void
 203 pdf_document_set_page_offset (EvDocument  *document,
 204                               int          x,
 205                               int          y)
 206 {
 207         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 208
 209         pdf_document->page_x_offset = x;
 210         pdf_document->page_y_offset = y;
 211 }
 212
 213 static void
 214 pdf_document_get_page_size (EvDocument   *document,
 215                             int          *width,
 216                             int          *height)
 217 {
 218         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 219
 220         if (document_validate_page (pdf_document)) {
 221                 if (width)
 222                         *width = pdf_document->out->getBitmapWidth();
 223                 if (height)
 224                         *height = pdf_document->out->getBitmapHeight();
 225         } else {
 226                 if (width)
 227                         *width = 1;
 228                 if (height)
 229                         *height = 1;
 230         }
 231 }
 232
 233 static void
 234 pdf_document_render (EvDocument  *document,
 235                      int          clip_x,
 236                      int          clip_y,
 237                      int          clip_width,
 238                      int          clip_height)
 239 {
 240         PdfDocument *pdf_document = PDF_DOCUMENT (document);
 241         GdkRectangle page;
 242         GdkRectangle draw;
 243
 244         if (!document_validate_page (pdf_document) || !pdf_document->target)
 245                 return;
 246
 247         page.x = pdf_document->page_x_offset;
 248         page.y = pdf_document->page_y_offset;
 249         page.width = pdf_document->out->getBitmapWidth();
 250         page.height = pdf_document->out->getBitmapHeight();
 251
 252         draw.x = clip_x;
 253         draw.y = clip_y;
 254         draw.width = clip_width;
 255         draw.height = clip_height;
 256
 257         if (gdk_rectangle_intersect (&page, &draw, &draw))
 258                 pdf_document->out->redraw (draw.x - page.x, draw.y - page.y,
 259                                            pdf_document->target,
 260                                            draw.x, draw.y,
 261                                            draw.width, draw.height);
 262 }
 263
 264 static void
 265 pdf_document_finalize (GObject *object)
 266 {
 267         PdfDocument *pdf_document = PDF_DOCUMENT (object);
 268
 269         if (pdf_document->target)
 270                 g_object_unref (pdf_document->target);
 271
 272         if (pdf_document->out)
 273                 delete pdf_document->out;
 274         if (pdf_document->doc)
 275                 delete pdf_document->doc;
 276
 277 }
 278
 279 static void
 280 pdf_document_class_init (PdfDocumentClass *klass)
 281 {
 282         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 283
 284         gobject_class->finalize = pdf_document_finalize;
 285 }
 286
 287 static void
 288 pdf_document_document_iface_init (EvDocumentIface *iface)
 289 {
 290         iface->load = pdf_document_load;
 291         iface->get_n_pages = pdf_document_get_n_pages;
 292         iface->set_page = pdf_document_set_page;
 293         iface->set_scale = pdf_document_set_scale;
 294         iface->set_target = pdf_document_set_target;
 295         iface->set_page_offset = pdf_document_set_page_offset;
 296         iface->get_page_size = pdf_document_get_page_size;
 297         iface->render = pdf_document_render;
 298 }
 299
 300 static void
 301 pdf_document_init (PdfDocument *pdf_document)
 302 {
 303         pdf_document->page = 1;
 304         pdf_document->page_x_offset = 0;
 305         pdf_document->page_y_offset = 0;
 306         pdf_document->scale = 1.;
 307
 308         pdf_document->page_valid = FALSE;
 309 }
 310