backend/dvi/dvi-document.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
   2 /*
   3  * Copyright (C) 2005, Nickolay V. Shmyrev <nshmyrev@yandex.ru>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "dvi-document.h"
  21 #include "ev-document-thumbnails.h"
  22 #include "ev-document-misc.h"
  23
  24 #include "mdvi.h"
  25 #include "fonts.h"
  26 #include "pixbuf-device.h"
  27
  28 #include <gtk/gtk.h>
  29 #include <glib/gi18n.h>
  30
  31 GMutex *dvi_context_mutex = NULL;
  32
  33 enum {
  34         PROP_0,
  35         PROP_TITLE
  36 };
  37
  38 struct _DviDocumentClass
  39 {
  40         GObjectClass parent_class;
  41 };
  42
  43 struct _DviDocument
  44 {
  45         GObject parent_instance;
  46
  47         DviContext *context;
  48         DviPageSpec *spec;
  49         DviParams *params;
  50
  51         /* To let document scale we should remember width and height */
  52
  53         double base_width;
  54         double base_height;
  55
  56         gchar *uri;
  57 };
  58
  59 typedef struct _DviDocumentClass DviDocumentClass;
  60
  61 static void dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg);
  62 static void dvi_document_document_iface_init (EvDocumentIface *iface);
  63 static void dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface);
  64 static void dvi_document_get_page_size                  (EvDocument   *document,
  65                                                          int       page,
  66                                                          double    *width,
  67                                                          double    *height);
  68
  69 G_DEFINE_TYPE_WITH_CODE
  70     (DviDocument, dvi_document, G_TYPE_OBJECT,
  71     {
  72       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT, dvi_document_document_iface_init);
  73       G_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS, dvi_document_document_thumbnails_iface_init)
  74      });
  75
  76 static gboolean
  77 dvi_document_load (EvDocument  *document,
  78                       const char  *uri,
  79                       GError     **error)
  80 {
  81     gchar *filename;
  82     DviDocument *dvi_document = DVI_DOCUMENT(document);
  83
  84     filename = g_filename_from_uri (uri, NULL, error);
  85
  86     if (!filename) {
  87                 g_set_error (error,
  88                              EV_DOCUMENT_ERROR,
  89                              EV_DOCUMENT_ERROR_INVALID,
  90                              _("File not available"));
  91                 return FALSE;
  92     }
  93
  94     g_mutex_lock (dvi_context_mutex);
  95     if (dvi_document->context)
  96         mdvi_destroy_context (dvi_document->context);
  97
  98     dvi_document->context = mdvi_init_context(dvi_document->params, dvi_document->spec, filename);
  99     g_mutex_unlock (dvi_context_mutex);
 100
 101     if (!dvi_document->context) {
 102                 g_set_error (error,
 103                              EV_DOCUMENT_ERROR,
 104                              EV_DOCUMENT_ERROR_INVALID,
 105                              _("DVI document has incorrect format"));
 106                 return FALSE;
 107     }
 108
 109     mdvi_pixbuf_device_init (&dvi_document->context->device);
 110
 111     dvi_document->base_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv
 112                 + 2 * unit2pix(dvi_document->params->dpi, MDVI_HMARGIN) / dvi_document->params->hshrink;
 113
 114     dvi_document->base_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv
 115                 + 2 * unit2pix(dvi_document->params->vdpi, MDVI_VMARGIN) / dvi_document->params->vshrink;
 116
 117     g_free (dvi_document->uri);
 118     dvi_document->uri = g_strdup (uri);
 119
 120     return TRUE;
 121 }
 122
 123
 124 static gboolean
 125 dvi_document_save (EvDocument  *document,
 126                       const char  *uri,
 127                       GError     **error)
 128 {
 129         DviDocument *dvi_document = DVI_DOCUMENT (document);
 130
 131         return ev_xfer_uri_simple (dvi_document->uri, uri, error);
 132 }
 133
 134 static int
 135 dvi_document_get_n_pages (EvDocument  *document)
 136 {
 137     DviDocument *dvi_document = DVI_DOCUMENT (document);
 138     return dvi_document->context->npages;
 139 }
 140
 141 static void
 142 dvi_document_get_page_size (EvDocument   *document,
 143                             int       page,
 144                             double    *width,
 145                             double    *height)
 146 {
 147         DviDocument * dvi_document = DVI_DOCUMENT (document);
 148
 149         *width = dvi_document->base_width;
 150         *height = dvi_document->base_height;;
 151
 152         return;
 153 }
 154
 155 static GdkPixbuf *
 156 dvi_document_render_pixbuf (EvDocument  *document,
 157                             EvRenderContext *rc)
 158 {
 159         GdkPixbuf *pixbuf;
 160         GdkPixbuf *rotated_pixbuf;
 161
 162         DviDocument *dvi_document = DVI_DOCUMENT(document);
 163
 164         gint required_width, required_height;
 165         gint proposed_width, proposed_height;
 166         gint xmargin = 0, ymargin = 0;
 167
 168         /* We should protect our context since it's not
 169          * thread safe. The work to the future -
 170          * let context render page independently
 171          */
 172         g_mutex_lock (dvi_context_mutex);
 173
 174         mdvi_setpage(dvi_document->context,  rc->page);
 175
 176         mdvi_set_shrink (dvi_document->context,
 177                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 178                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 179
 180         required_width = dvi_document->base_width * rc->scale;
 181         required_height = dvi_document->base_height * rc->scale;
 182         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 183         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 184
 185         if (required_width >= proposed_width)
 186             xmargin = (required_width - proposed_width) / 2;
 187         if (required_height >= proposed_height)
 188             ymargin = (required_height - proposed_height) / 2;
 189
 190         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 191
 192         mdvi_pixbuf_device_render (dvi_document->context);
 193
 194         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 195
 196         g_mutex_unlock (dvi_context_mutex);
 197
 198         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 199         g_object_unref (pixbuf);
 200
 201         return rotated_pixbuf;
 202 }
 203
 204 static void
 205 dvi_document_finalize (GObject *object)
 206 {
 207         DviDocument *dvi_document = DVI_DOCUMENT(object);
 208
 209         g_mutex_lock (dvi_context_mutex);
 210         if (dvi_document->context) {
 211                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 212                 mdvi_destroy_context (dvi_document->context);
 213         }
 214         g_mutex_unlock (dvi_context_mutex);
 215
 216         if (dvi_document->params)
 217                 g_free (dvi_document->params);
 218
 219         g_free (dvi_document->uri);
 220
 221         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 222 }
 223
 224
 225 static void
 226 dvi_document_class_init (DviDocumentClass *klass)
 227 {
 228         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 229
 230         gobject_class->finalize = dvi_document_finalize;
 231
 232         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 233         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 234         mdvi_register_fonts ();
 235
 236         dvi_context_mutex = g_mutex_new ();
 237 }
 238
 239 static gboolean
 240 dvi_document_can_get_text (EvDocument *document)
 241 {
 242         return FALSE;
 243 }
 244
 245 static EvDocumentInfo *
 246 dvi_document_get_info (EvDocument *document)
 247 {
 248         EvDocumentInfo *info;
 249
 250         info = g_new0 (EvDocumentInfo, 1);
 251
 252         return info;
 253 }
 254
 255 static void
 256 dvi_document_document_iface_init (EvDocumentIface *iface)
 257 {
 258         iface->load = dvi_document_load;
 259         iface->save = dvi_document_save;
 260         iface->can_get_text = dvi_document_can_get_text;
 261         iface->get_n_pages = dvi_document_get_n_pages;
 262         iface->get_page_size = dvi_document_get_page_size;
 263         iface->render_pixbuf = dvi_document_render_pixbuf;
 264         iface->get_info = dvi_document_get_info;
 265 }
 266
 267 static void
 268 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 269                                         EvRenderContext      *rc,
 270                                         gint                  *width,
 271                                         gint                  *height)
 272 {
 273         DviDocument *dvi_document = DVI_DOCUMENT (document);
 274         gdouble page_width = dvi_document->base_width;
 275         gdouble page_height = dvi_document->base_height;
 276
 277         if (rc->rotation == 90 || rc->rotation == 270) {
 278                 *width = (gint) (page_height * rc->scale);
 279                 *height = (gint) (page_width * rc->scale);
 280         } else {
 281                 *width = (gint) (page_width * rc->scale);
 282                 *height = (gint) (page_height * rc->scale);
 283         }
 284 }
 285
 286 static GdkPixbuf *
 287 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 288                                        EvRenderContext      *rc,
 289                                        gboolean              border)
 290 {
 291         DviDocument *dvi_document = DVI_DOCUMENT (document);
 292         GdkPixbuf *pixbuf;
 293         GdkPixbuf *border_pixbuf;
 294         GdkPixbuf *rotated_pixbuf;
 295         gint thumb_width, thumb_height;
 296         gint proposed_width, proposed_height;
 297
 298         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 299         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 300
 301         g_mutex_lock (dvi_context_mutex);
 302
 303         mdvi_setpage (dvi_document->context, rc->page);
 304
 305         mdvi_set_shrink (dvi_document->context,
 306                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 307                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 308
 309         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 310         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 311
 312         if (border) {
 313                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 314                                                  MAX (thumb_width - proposed_width, 0) / 2,
 315                                                  MAX (thumb_height - proposed_height, 0) / 2);
 316         } else {
 317                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 318                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 319                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 320         }
 321
 322
 323         mdvi_pixbuf_device_render (dvi_document->context);
 324         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 325
 326         g_mutex_unlock (dvi_context_mutex);
 327
 328         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 329         g_object_unref (pixbuf);
 330
 331         if (border) {
 332               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 333
 334               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 335               g_object_unref (tmp_pixbuf);
 336         }
 337
 338         return rotated_pixbuf;
 339 }
 340
 341 static void
 342 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 343 {
 344         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 345         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 346 }
 347
 348 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 349
 350 static gboolean
 351 hsb2rgb (float h, float s, float v, char *red, char *green, char *blue)
 352 {
 353         float i, f, p, q, t, r, g, b;
 354
 355         if (h == 360)
 356                 h = 0;
 357         else if ((h > 360) || (h < 0))
 358                 return FALSE;
 359
 360         s /= 100;
 361         v /= 100;
 362         h /= 60;
 363         i = floor (h);
 364         f = h - i;
 365         p = v * (1 - s);
 366         q = v * (1 - (s * f));
 367         t = v * (1 - (s * (1 - f)));
 368
 369         if (i == 0) {
 370                 r = v;
 371                 g = t;
 372                 b = p;
 373         } else if (i == 1) {
 374                 r = q;
 375                 g = v;
 376                 b = p;
 377         } else if (i == 2) {
 378                 r = p;
 379                 g = v;
 380                 b = t;
 381         } else if (i == 3) {
 382                 r = p;
 383                 g = q;
 384                 b = v;
 385         } else if (i == 4) {
 386                 r = t;
 387                 g = p;
 388                 b = v;
 389         } else if (i == 5) {
 390                 r = v;
 391                 g = p;
 392                 b = q;
 393         }
 394
 395         (*red) = (char)floor(r * 255);
 396         (*green) = (char)floor(g * 255);
 397         (*blue) = (char)floor(b * 255);
 398
 399         return TRUE;
 400 }
 401
 402 static void
 403 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 404 {
 405         char *op, *color;
 406
 407         if (strncmp (arg, "pop", 3) == 0) {
 408                 mdvi_pop_color (dvi);
 409         } else if (strncmp (arg, "push", 4) == 0) {
 410                 /* Find color source : Named, CMYK or RGB */
 411                 const char *tmp = arg+4;
 412                 while (isspace (*tmp)) tmp++;
 413
 414                 if (!strncmp ("rgb", tmp, 3)) {
 415                         float r, g, b;
 416                         unsigned char red, green, blue;
 417                         sscanf (tmp+4, "%f %f %f", &r, &g, &b);
 418                         red = 255*r;
 419                         green = 255*g;
 420                         blue = 255*b;
 421                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 422                 } else if (!strncmp ("hsb", tmp, 4)) {
 423                         float h, s, b;
 424                         char red, green, blue;
 425                         sscanf (tmp+4, "%f %f %f", &h, &s, &b);
 426
 427                         if (hsb2rgb (h, s, b, &red, &green, &blue))
 428                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 429                 } else if (!strncmp ("cmyk", tmp, 4)) {
 430                         double r, g, b, c, m, y, k;
 431
 432                         sscanf (tmp+5, "%f %f %f %f", &c, &m, &y, &k);
 433
 434                         r = 1.0 - c - k;
 435                         if (r < 0.0)
 436                                 r = 0.0;
 437                         g = 1.0 - m - k;
 438                         if (g < 0.0)
 439                                 g = 0.0;
 440                         b = 1.0 - y - k;
 441                         if (b < 0.0)
 442                                 b = 0.0;
 443                         mdvi_push_color (dvi, RGB2ULONG ((char)(r*255+0.5), (char)(r*255+0.5),
 444                                                          (char)(b*255+0.5)), 0xFFFFFFFF);
 445                 } else {
 446                         GdkColor color;
 447                         if (gdk_color_parse (tmp, &color))
 448                                 mdvi_push_color (dvi, RGB2ULONG (color.red*255/65535,
 449                                                                  color.green*255/65535,
 450                                                                  color.blue*255/65535), 0xFFFFFFFF);
 451                 }
 452         }
 453 }
 454
 455 static void
 456 dvi_document_init_params (DviDocument *dvi_document)
 457 {
 458         dvi_document->params = g_new0 (DviParams, 1);
 459
 460         dvi_document->params->dpi      = MDVI_DPI;
 461         dvi_document->params->vdpi     = MDVI_VDPI;
 462         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 463         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 464         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 465         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 466         dvi_document->params->hdrift   = 0;
 467         dvi_document->params->vdrift   = 0;
 468         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 469         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 470         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 471
 472         dvi_document->spec = NULL;
 473
 474         dvi_document->params->bg = 0xffffffff;
 475         dvi_document->params->fg = 0xff000000;
 476 }
 477
 478 static void
 479 dvi_document_init (DviDocument *dvi_document)
 480 {
 481         dvi_document->context = NULL;
 482         dvi_document_init_params (dvi_document);
 483 }