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 cairo_surface_t *
 156 dvi_document_render (EvDocument      *document,
 157                      EvRenderContext *rc)
 158 {
 159         GdkPixbuf *pixbuf;
 160         cairo_surface_t *surface;
 161         cairo_surface_t *rotated_surface;
 162         DviDocument *dvi_document = DVI_DOCUMENT(document);
 163         gint required_width, required_height;
 164         gint proposed_width, proposed_height;
 165         gint xmargin = 0, ymargin = 0;
 166
 167         /* We should protect our context since it's not
 168          * thread safe. The work to the future -
 169          * let context render page independently
 170          */
 171         g_mutex_lock (dvi_context_mutex);
 172
 173         mdvi_setpage(dvi_document->context,  rc->page);
 174
 175         mdvi_set_shrink (dvi_document->context,
 176                          (int)((dvi_document->params->hshrink - 1) / rc->scale) + 1,
 177                          (int)((dvi_document->params->vshrink - 1) / rc->scale) + 1);
 178
 179         required_width = dvi_document->base_width * rc->scale + 0.5;
 180         required_height = dvi_document->base_height * rc->scale + 0.5;
 181         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 182         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 183
 184         if (required_width >= proposed_width)
 185             xmargin = (required_width - proposed_width) / 2;
 186         if (required_height >= proposed_height)
 187             ymargin = (required_height - proposed_height) / 2;
 188
 189         mdvi_pixbuf_device_set_margins (&dvi_document->context->device, xmargin, ymargin);
 190
 191         mdvi_pixbuf_device_render (dvi_document->context);
 192
 193         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 194
 195         g_mutex_unlock (dvi_context_mutex);
 196
 197         /* FIXME: we should write a mdvi device based on cairo */
 198         surface = ev_document_misc_surface_from_pixbuf (pixbuf);
 199         g_object_unref (pixbuf);
 200
 201         rotated_surface = ev_document_misc_surface_rotate_and_scale (surface,
 202                                                                      required_width,
 203                                                                      required_height,
 204                                                                      rc->rotation);
 205         cairo_surface_destroy (surface);
 206
 207         return rotated_surface;
 208 }
 209
 210 static void
 211 dvi_document_finalize (GObject *object)
 212 {
 213         DviDocument *dvi_document = DVI_DOCUMENT(object);
 214
 215         g_mutex_lock (dvi_context_mutex);
 216         if (dvi_document->context) {
 217                 mdvi_pixbuf_device_free (&dvi_document->context->device);
 218                 mdvi_destroy_context (dvi_document->context);
 219         }
 220         g_mutex_unlock (dvi_context_mutex);
 221
 222         if (dvi_document->params)
 223                 g_free (dvi_document->params);
 224
 225         g_free (dvi_document->uri);
 226
 227         G_OBJECT_CLASS (dvi_document_parent_class)->finalize (object);
 228 }
 229
 230
 231 static void
 232 dvi_document_class_init (DviDocumentClass *klass)
 233 {
 234         GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 235
 236         gobject_class->finalize = dvi_document_finalize;
 237
 238         mdvi_init_kpathsea("evince", MDVI_MFMODE, MDVI_FALLBACK_FONT, MDVI_DPI);
 239         mdvi_register_special ("Color", "color", NULL, dvi_document_do_color_special, 1);
 240         mdvi_register_fonts ();
 241
 242         dvi_context_mutex = g_mutex_new ();
 243 }
 244
 245 static gboolean
 246 dvi_document_can_get_text (EvDocument *document)
 247 {
 248         return FALSE;
 249 }
 250
 251 static EvDocumentInfo *
 252 dvi_document_get_info (EvDocument *document)
 253 {
 254         EvDocumentInfo *info;
 255
 256         info = g_new0 (EvDocumentInfo, 1);
 257
 258         return info;
 259 }
 260
 261 static void
 262 dvi_document_document_iface_init (EvDocumentIface *iface)
 263 {
 264         iface->load = dvi_document_load;
 265         iface->save = dvi_document_save;
 266         iface->can_get_text = dvi_document_can_get_text;
 267         iface->get_n_pages = dvi_document_get_n_pages;
 268         iface->get_page_size = dvi_document_get_page_size;
 269         iface->render = dvi_document_render;
 270         iface->get_info = dvi_document_get_info;
 271 }
 272
 273 static void
 274 dvi_document_thumbnails_get_dimensions (EvDocumentThumbnails *document,
 275                                         EvRenderContext      *rc,
 276                                         gint                  *width,
 277                                         gint                  *height)
 278 {
 279         DviDocument *dvi_document = DVI_DOCUMENT (document);
 280         gdouble page_width = dvi_document->base_width;
 281         gdouble page_height = dvi_document->base_height;
 282
 283         if (rc->rotation == 90 || rc->rotation == 270) {
 284                 *width = (gint) (page_height * rc->scale);
 285                 *height = (gint) (page_width * rc->scale);
 286         } else {
 287                 *width = (gint) (page_width * rc->scale);
 288                 *height = (gint) (page_height * rc->scale);
 289         }
 290 }
 291
 292 static GdkPixbuf *
 293 dvi_document_thumbnails_get_thumbnail (EvDocumentThumbnails *document,
 294                                        EvRenderContext      *rc,
 295                                        gboolean              border)
 296 {
 297         DviDocument *dvi_document = DVI_DOCUMENT (document);
 298         GdkPixbuf *pixbuf;
 299         GdkPixbuf *border_pixbuf;
 300         GdkPixbuf *rotated_pixbuf;
 301         gint thumb_width, thumb_height;
 302         gint proposed_width, proposed_height;
 303
 304         thumb_width = (gint) (dvi_document->base_width * rc->scale);
 305         thumb_height = (gint) (dvi_document->base_height * rc->scale);
 306
 307         g_mutex_lock (dvi_context_mutex);
 308
 309         mdvi_setpage (dvi_document->context, rc->page);
 310
 311         mdvi_set_shrink (dvi_document->context,
 312                           (int)dvi_document->base_width * dvi_document->params->hshrink / thumb_width,
 313                           (int)dvi_document->base_height * dvi_document->params->vshrink / thumb_height);
 314
 315         proposed_width = dvi_document->context->dvi_page_w * dvi_document->context->params.conv;
 316         proposed_height = dvi_document->context->dvi_page_h * dvi_document->context->params.vconv;
 317
 318         if (border) {
 319                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 320                                                  MAX (thumb_width - proposed_width, 0) / 2,
 321                                                  MAX (thumb_height - proposed_height, 0) / 2);
 322         } else {
 323                 mdvi_pixbuf_device_set_margins  (&dvi_document->context->device,
 324                                                  MAX (thumb_width - proposed_width - 2, 0) / 2,
 325                                                  MAX (thumb_height - proposed_height - 2, 0) / 2);
 326         }
 327
 328
 329         mdvi_pixbuf_device_render (dvi_document->context);
 330         pixbuf = mdvi_pixbuf_device_get_pixbuf (&dvi_document->context->device);
 331
 332         g_mutex_unlock (dvi_context_mutex);
 333
 334         rotated_pixbuf = gdk_pixbuf_rotate_simple (pixbuf, 360 - rc->rotation);
 335         g_object_unref (pixbuf);
 336
 337         if (border) {
 338               GdkPixbuf *tmp_pixbuf = rotated_pixbuf;
 339
 340               rotated_pixbuf = ev_document_misc_get_thumbnail_frame (-1, -1, tmp_pixbuf);
 341               g_object_unref (tmp_pixbuf);
 342         }
 343
 344         return rotated_pixbuf;
 345 }
 346
 347 static void
 348 dvi_document_document_thumbnails_iface_init (EvDocumentThumbnailsIface *iface)
 349 {
 350         iface->get_thumbnail = dvi_document_thumbnails_get_thumbnail;
 351         iface->get_dimensions = dvi_document_thumbnails_get_dimensions;
 352 }
 353
 354 #define RGB2ULONG(r,g,b) ((0xFF<<24)|(r<<16)|(g<<8)|(b))
 355
 356 static gboolean
 357 hsb2rgb (float h, float s, float v, char *red, char *green, char *blue)
 358 {
 359         float i, f, p, q, t, r, g, b;
 360
 361         if (h == 360)
 362                 h = 0;
 363         else if ((h > 360) || (h < 0))
 364                 return FALSE;
 365
 366         s /= 100;
 367         v /= 100;
 368         h /= 60;
 369         i = floor (h);
 370         f = h - i;
 371         p = v * (1 - s);
 372         q = v * (1 - (s * f));
 373         t = v * (1 - (s * (1 - f)));
 374
 375         if (i == 0) {
 376                 r = v;
 377                 g = t;
 378                 b = p;
 379         } else if (i == 1) {
 380                 r = q;
 381                 g = v;
 382                 b = p;
 383         } else if (i == 2) {
 384                 r = p;
 385                 g = v;
 386                 b = t;
 387         } else if (i == 3) {
 388                 r = p;
 389                 g = q;
 390                 b = v;
 391         } else if (i == 4) {
 392                 r = t;
 393                 g = p;
 394                 b = v;
 395         } else if (i == 5) {
 396                 r = v;
 397                 g = p;
 398                 b = q;
 399         }
 400
 401         (*red) = (char)floor(r * 255);
 402         (*green) = (char)floor(g * 255);
 403         (*blue) = (char)floor(b * 255);
 404
 405         return TRUE;
 406 }
 407
 408 static void
 409 dvi_document_do_color_special (DviContext *dvi, const char *prefix, const char *arg)
 410 {
 411         char *op, *color;
 412
 413         if (strncmp (arg, "pop", 3) == 0) {
 414                 mdvi_pop_color (dvi);
 415         } else if (strncmp (arg, "push", 4) == 0) {
 416                 /* Find color source : Named, CMYK or RGB */
 417                 const char *tmp = arg+4;
 418                 while (isspace (*tmp)) tmp++;
 419
 420                 if (!strncmp ("rgb", tmp, 3)) {
 421                         float r, g, b;
 422                         unsigned char red, green, blue;
 423                         sscanf (tmp+4, "%f %f %f", &r, &g, &b);
 424                         red = 255*r;
 425                         green = 255*g;
 426                         blue = 255*b;
 427                         mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 428                 } else if (!strncmp ("hsb", tmp, 4)) {
 429                         float h, s, b;
 430                         char red, green, blue;
 431                         sscanf (tmp+4, "%f %f %f", &h, &s, &b);
 432
 433                         if (hsb2rgb (h, s, b, &red, &green, &blue))
 434                                 mdvi_push_color (dvi, RGB2ULONG (red, green, blue), 0xFFFFFFFF);
 435                 } else if (!strncmp ("cmyk", tmp, 4)) {
 436                         double r, g, b, c, m, y, k;
 437
 438                         sscanf (tmp+5, "%f %f %f %f", &c, &m, &y, &k);
 439
 440                         r = 1.0 - c - k;
 441                         if (r < 0.0)
 442                                 r = 0.0;
 443                         g = 1.0 - m - k;
 444                         if (g < 0.0)
 445                                 g = 0.0;
 446                         b = 1.0 - y - k;
 447                         if (b < 0.0)
 448                                 b = 0.0;
 449                         mdvi_push_color (dvi, RGB2ULONG ((char)(r*255+0.5), (char)(r*255+0.5),
 450                                                          (char)(b*255+0.5)), 0xFFFFFFFF);
 451                 } else {
 452                         GdkColor color;
 453                         if (gdk_color_parse (tmp, &color))
 454                                 mdvi_push_color (dvi, RGB2ULONG (color.red*255/65535,
 455                                                                  color.green*255/65535,
 456                                                                  color.blue*255/65535), 0xFFFFFFFF);
 457                 }
 458         }
 459 }
 460
 461 static void
 462 dvi_document_init_params (DviDocument *dvi_document)
 463 {
 464         dvi_document->params = g_new0 (DviParams, 1);
 465
 466         dvi_document->params->dpi      = MDVI_DPI;
 467         dvi_document->params->vdpi     = MDVI_VDPI;
 468         dvi_document->params->mag      = MDVI_MAGNIFICATION;
 469         dvi_document->params->density  = MDVI_DEFAULT_DENSITY;
 470         dvi_document->params->gamma    = MDVI_DEFAULT_GAMMA;
 471         dvi_document->params->flags    = MDVI_PARAM_ANTIALIASED;
 472         dvi_document->params->hdrift   = 0;
 473         dvi_document->params->vdrift   = 0;
 474         dvi_document->params->hshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->dpi);
 475         dvi_document->params->vshrink  =  MDVI_SHRINK_FROM_DPI(dvi_document->params->vdpi);
 476         dvi_document->params->orientation = MDVI_ORIENT_TBLR;
 477
 478         dvi_document->spec = NULL;
 479
 480         dvi_document->params->bg = 0xffffffff;
 481         dvi_document->params->fg = 0xff000000;
 482 }
 483
 484 static void
 485 dvi_document_init (DviDocument *dvi_document)
 486 {
 487         dvi_document->context = NULL;
 488         dvi_document_init_params (dvi_document);
 489 }