src/print-preview.c

   1 /* GIMP - The GNU Image Manipulation Program
   2  * Copyright (C) 1995 Spencer Kimball and Peter Mattis
   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 of the License, or
   7  * (at your option) 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  * Modified for viking by Quy Tonthat <qtonthat@gmail.com>
  20  */
  21
  22 #include <gtk/gtk.h>
  23
  24 #if GTK_CHECK_VERSION(2,10,0)
  25
  26 #include "print-preview.h"
  27
  28
  29 #define DRAWING_AREA_SIZE 200
  30
  31
  32 enum
  33 {
  34   OFFSETS_CHANGED,
  35   LAST_SIGNAL
  36 };
  37
  38
  39 static void      vik_print_preview_finalize         (GObject          *object);
  40
  41 static void      vik_print_preview_size_allocate    (GtkWidget        *widget,
  42                                                       GtkAllocation    *allocation,
  43                                                       VikPrintPreview *preview);
  44 static void      vik_print_preview_realize          (GtkWidget        *widget);
  45 static gboolean  vik_print_preview_event            (GtkWidget        *widget,
  46                                                       GdkEvent         *event,
  47                                                       VikPrintPreview *preview);
  48
  49 static gboolean  vik_print_preview_expose_event     (GtkWidget        *widget,
  50                                                       GdkEventExpose   *eevent,
  51                                                       VikPrintPreview *preview);
  52
  53 static gdouble   vik_print_preview_get_scale        (VikPrintPreview *preview);
  54
  55 static void      vik_print_preview_get_page_margins (VikPrintPreview *preview,
  56                                                       gdouble          *left_margin,
  57                                                       gdouble          *right_margin,
  58                                                       gdouble          *top_margin,
  59                                                       gdouble          *bottom_margin);
  60
  61 static void      print_preview_queue_draw            (VikPrintPreview *preview);
  62
  63
  64 G_DEFINE_TYPE (VikPrintPreview, vik_print_preview, GTK_TYPE_ASPECT_FRAME)
  65
  66 #define parent_class vik_print_preview_parent_class
  67
  68 static guint vik_print_preview_signals[LAST_SIGNAL] = { 0 };
  69
  70
  71 #define g_marshal_value_peek_double(v)   (v)->data[0].v_double
  72
  73 static void
  74 marshal_VOID__DOUBLE_DOUBLE (GClosure     *closure,
  75                              GValue       *return_value,
  76                              guint         n_param_values,
  77                              const GValue *param_values,
  78                              gpointer      invocation_hint,
  79                              gpointer      marshal_data)
  80 {
  81   typedef void (*GMarshalFunc_VOID__DOUBLE_DOUBLE) (gpointer     data1,
  82                                                     gdouble      arg_1,
  83                                                     gdouble      arg_2,
  84                                                     gpointer     data2);
  85   register GMarshalFunc_VOID__DOUBLE_DOUBLE callback;
  86   register GCClosure *cc = (GCClosure*) closure;
  87   register gpointer data1, data2;
  88
  89   g_return_if_fail (n_param_values == 3);
  90
  91   if (G_CCLOSURE_SWAP_DATA (closure))
  92     {
  93       data1 = closure->data;
  94       data2 = g_value_peek_pointer (param_values + 0);
  95     }
  96   else
  97     {
  98       data1 = g_value_peek_pointer (param_values + 0);
  99       data2 = closure->data;
 100     }
 101
 102   callback = (GMarshalFunc_VOID__DOUBLE_DOUBLE) (marshal_data ?
 103                                                  marshal_data : cc->callback);
 104
 105   callback (data1,
 106             g_marshal_value_peek_double (param_values + 1),
 107             g_marshal_value_peek_double (param_values + 2),
 108             data2);
 109 }
 110
 111 static void
 112 vik_print_preview_class_init (VikPrintPreviewClass *klass)
 113 {
 114   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 115
 116   vik_print_preview_signals[OFFSETS_CHANGED] =
 117     g_signal_new ("offsets-changed",
 118                   G_TYPE_FROM_CLASS (klass),
 119                   G_SIGNAL_RUN_FIRST,
 120                   G_STRUCT_OFFSET (VikPrintPreviewClass, offsets_changed),
 121                   NULL, NULL,
 122                   marshal_VOID__DOUBLE_DOUBLE,
 123                   G_TYPE_NONE, 2,
 124                   G_TYPE_DOUBLE,
 125                   G_TYPE_DOUBLE);
 126
 127   object_class->finalize = vik_print_preview_finalize;
 128
 129   klass->offsets_changed = NULL;
 130 }
 131
 132 static void
 133 vik_print_preview_init (VikPrintPreview *preview)
 134 {
 135   preview->page               = NULL;
 136   preview->pixbuf             = NULL;
 137   preview->dragging           = FALSE;
 138   preview->image_offset_x     = 0.0;
 139   preview->image_offset_y     = 0.0;
 140   preview->image_offset_x_max = 0.0;
 141   preview->image_offset_y_max = 0.0;
 142   preview->image_xres         = 230.0; // 1.0
 143   preview->image_yres         = 230.0;
 144   preview->use_full_page      = FALSE;
 145
 146   preview->area = gtk_drawing_area_new();
 147   gtk_container_add (GTK_CONTAINER (preview), preview->area);
 148   gtk_widget_show (preview->area);
 149
 150   gtk_widget_add_events (GTK_WIDGET (preview->area), GDK_BUTTON_PRESS_MASK);
 151
 152   g_signal_connect (preview->area, "size-allocate",
 153                     G_CALLBACK (vik_print_preview_size_allocate),
 154                     preview);
 155   g_signal_connect (preview->area, "realize",
 156                     G_CALLBACK (vik_print_preview_realize),
 157                     NULL);
 158   g_signal_connect (preview->area, "event",
 159                     G_CALLBACK (vik_print_preview_event),
 160                     preview);
 161   g_signal_connect (preview->area, "expose-event",
 162                     G_CALLBACK (vik_print_preview_expose_event),
 163                     preview);
 164 }
 165
 166
 167 static void
 168 vik_print_preview_finalize (GObject *object)
 169 {
 170   VikPrintPreview *preview = VIK_PRINT_PREVIEW (object);
 171
 172   if (preview->drawable)
 173     {
 174       preview->drawable = NULL;
 175     }
 176
 177   if (preview->pixbuf)
 178     {
 179       g_object_unref (preview->pixbuf);
 180       preview->pixbuf = NULL;
 181     }
 182
 183   if (preview->page)
 184     {
 185       g_object_unref (preview->page);
 186       preview->page = NULL;
 187     }
 188
 189   G_OBJECT_CLASS (vik_print_preview_parent_class)->finalize (object);
 190 }
 191
 192 /**
 193  * vik_print_preview_new:
 194  * @page: page setup
 195  * @drawable_id: the drawable to print
 196  *
 197  * Creates a new #VikPrintPreview widget.
 198  *
 199  * Return value: the new #VikPrintPreview widget.
 200  **/
 201 GtkWidget *
 202 vik_print_preview_new (GtkPageSetup *page,
 203                         GdkDrawable        *drawable)
 204 {
 205   VikPrintPreview *preview;
 206   gfloat            ratio;
 207
 208   preview = g_object_new (VIK_TYPE_PRINT_PREVIEW, NULL);
 209
 210   preview->drawable = drawable;
 211
 212   if (page != NULL)
 213     preview->page = gtk_page_setup_copy (page);
 214   else
 215     preview->page = gtk_page_setup_new ();
 216
 217   ratio = (gtk_page_setup_get_paper_width (preview->page, GTK_UNIT_POINTS) /
 218            gtk_page_setup_get_paper_height (preview->page, GTK_UNIT_POINTS));
 219
 220   gtk_aspect_frame_set (GTK_ASPECT_FRAME (preview), 0.5, 0.5, ratio, FALSE);
 221
 222   gtk_widget_set_size_request (preview->area,
 223                                DRAWING_AREA_SIZE, DRAWING_AREA_SIZE);
 224
 225   return GTK_WIDGET (preview);
 226 }
 227
 228 /**
 229  * vik_print_preview_set_image_dpi:
 230  * @preview: a #VikPrintPreview.
 231  * @xres: the X resolution
 232  * @yres: the Y resolution
 233  *
 234  * Sets the resolution of the image/drawable displayed by the
 235  * #VikPrintPreview.
 236  **/
 237 void
 238 vik_print_preview_set_image_dpi (VikPrintPreview *preview,
 239                                   gdouble           xres,
 240                                   gdouble           yres)
 241 {
 242   g_return_if_fail (VIK_IS_PRINT_PREVIEW (preview));
 243
 244   if (preview->image_xres != xres || preview->image_yres != yres)
 245     {
 246       preview->image_xres = xres;
 247       preview->image_yres = yres;
 248
 249       print_preview_queue_draw (preview);
 250     }
 251 }
 252
 253 /**
 254  * vik_print_preview_set_page_setup:
 255  * @preview: a #VikPrintPreview.
 256  * @page: the page setup to use
 257  *
 258  * Sets the page setup to use by the #VikPrintPreview.
 259  **/
 260 void
 261 vik_print_preview_set_page_setup (VikPrintPreview *preview,
 262                                    GtkPageSetup     *page)
 263 {
 264   gfloat ratio;
 265
 266   if (preview->page)
 267     g_object_unref (preview->page);
 268
 269   preview->page = gtk_page_setup_copy (page);
 270
 271   ratio = (gtk_page_setup_get_paper_width (page, GTK_UNIT_POINTS) /
 272            gtk_page_setup_get_paper_height (page, GTK_UNIT_POINTS));
 273
 274   gtk_aspect_frame_set (GTK_ASPECT_FRAME (preview), 0.5, 0.5, ratio, FALSE);
 275
 276   print_preview_queue_draw (preview);
 277 }
 278
 279 /**
 280  * vik_print_preview_set_image_offsets:
 281  * @preview: a #VikPrintPreview.
 282  * @offset_x: the X offset
 283  * @offset_y: the Y offset
 284  *
 285  * Sets the offsets of the image/drawable displayed by the #VikPrintPreview.
 286  * It does not emit the "offsets-changed" signal.
 287  **/
 288 void
 289 vik_print_preview_set_image_offsets (VikPrintPreview *preview,
 290                                       gdouble           offset_x,
 291                                       gdouble           offset_y)
 292 {
 293   g_return_if_fail (VIK_IS_PRINT_PREVIEW (preview));
 294
 295   preview->image_offset_x = offset_x;
 296   preview->image_offset_y = offset_y;
 297
 298   print_preview_queue_draw (preview);
 299 }
 300
 301 /**
 302  * vik_print_preview_set_image_offsets_max:
 303  * @preview: a #VikPrintPreview.
 304  * @offset_x_max: the maximum X offset allowed
 305  * @offset_y_max: the maximum Y offset allowed
 306  *
 307  * Sets the maximum offsets of the image/drawable displayed by the
 308  * #VikPrintPreview.  It does not emit the "offsets-changed" signal.
 309  **/
 310 void
 311 vik_print_preview_set_image_offsets_max (VikPrintPreview *preview,
 312                                           gdouble           offset_x_max,
 313                                           gdouble           offset_y_max)
 314 {
 315   g_return_if_fail (VIK_IS_PRINT_PREVIEW (preview));
 316
 317   preview->image_offset_x_max = offset_x_max;
 318   preview->image_offset_y_max = offset_y_max;
 319
 320   print_preview_queue_draw (preview);
 321 }
 322
 323 /**
 324  * vik_print_preview_set_use_full_page:
 325  * @preview: a #VikPrintPreview.
 326  * @full_page: TRUE to ignore the page margins
 327  *
 328  * If @full_page is TRUE, the page margins are ignored and the full page
 329  * can be used to setup printing.
 330  **/
 331 void
 332 vik_print_preview_set_use_full_page (VikPrintPreview *preview,
 333                                       gboolean          full_page)
 334 {
 335   g_return_if_fail (VIK_IS_PRINT_PREVIEW (preview));
 336
 337   preview->use_full_page = full_page;
 338
 339   print_preview_queue_draw (preview);
 340 }
 341
 342 static void
 343 vik_print_preview_realize (GtkWidget *widget)
 344 {
 345   GdkCursor *cursor;
 346
 347   cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
 348                                        GDK_FLEUR);
 349   gdk_window_set_cursor (widget->window, cursor);
 350   gdk_cursor_unref (cursor);
 351 }
 352
 353 static gboolean
 354 vik_print_preview_event (GtkWidget        *widget,
 355                           GdkEvent         *event,
 356                           VikPrintPreview *preview)
 357 {
 358   static gdouble orig_offset_x = 0.0;
 359   static gdouble orig_offset_y = 0.0;
 360   static gint    start_x       = 0;
 361   static gint    start_y       = 0;
 362
 363   gdouble        offset_x;
 364   gdouble        offset_y;
 365   gdouble        scale;
 366
 367   switch (event->type)
 368     {
 369     case GDK_BUTTON_PRESS:
 370       gdk_pointer_grab (widget->window, FALSE,
 371                         (GDK_BUTTON1_MOTION_MASK |
 372                          GDK_BUTTON_RELEASE_MASK),
 373                         NULL, NULL, event->button.time);
 374
 375       orig_offset_x = preview->image_offset_x;
 376       orig_offset_y = preview->image_offset_y;
 377
 378       start_x = event->button.x;
 379       start_y = event->button.y;
 380
 381       preview->dragging = TRUE;
 382       break;
 383
 384     case GDK_MOTION_NOTIFY:
 385       scale = vik_print_preview_get_scale (preview);
 386
 387       offset_x = (orig_offset_x + (event->motion.x - start_x) / scale);
 388       offset_y = (orig_offset_y + (event->motion.y - start_y) / scale);
 389
 390       offset_x = CLAMP (offset_x, 0, preview->image_offset_x_max);
 391       offset_y = CLAMP (offset_y, 0, preview->image_offset_y_max);
 392
 393       if (preview->image_offset_x != offset_x ||
 394           preview->image_offset_y != offset_y)
 395         {
 396           vik_print_preview_set_image_offsets (preview, offset_x, offset_y);
 397
 398           g_signal_emit (preview,
 399                          vik_print_preview_signals[OFFSETS_CHANGED], 0,
 400                          preview->image_offset_x, preview->image_offset_y);
 401         }
 402       break;
 403
 404     case GDK_BUTTON_RELEASE:
 405       gdk_display_pointer_ungrab (gtk_widget_get_display (widget),
 406                                   event->button.time);
 407       start_x = start_y = 0;
 408       preview->dragging = FALSE;
 409
 410       print_preview_queue_draw (preview);
 411       break;
 412
 413     default:
 414       break;
 415     }
 416
 417   return FALSE;
 418 }
 419
 420 static GdkPixbuf *get_thumbnail(GdkDrawable *drawable, gint thumb_width, gint thumb_height)
 421 {
 422   gint width, height;
 423   GdkPixbuf *pixbuf;
 424   GdkPixbuf *thumbnail;
 425
 426   gdk_drawable_get_size(drawable, &width, &height);
 427   pixbuf = gdk_pixbuf_get_from_drawable(NULL, drawable,
 428                                            NULL, 0, 0, 0, 0, width, height);
 429   thumbnail = gdk_pixbuf_scale_simple(pixbuf, thumb_width, thumb_height,
 430                                       GDK_INTERP_BILINEAR);
 431   g_object_unref(pixbuf);
 432   return thumbnail;
 433 }
 434
 435 static gboolean
 436 vik_print_preview_expose_event (GtkWidget        *widget,
 437                                  GdkEventExpose   *eevent,
 438                                  VikPrintPreview *preview)
 439 {
 440   gdouble  paper_width;
 441   gdouble  paper_height;
 442   gdouble  left_margin;
 443   gdouble  right_margin;
 444   gdouble  top_margin;
 445   gdouble  bottom_margin;
 446   gdouble  scale;
 447   cairo_t *cr;
 448
 449   paper_width = gtk_page_setup_get_paper_width (preview->page,
 450                                                 GTK_UNIT_POINTS);
 451   paper_height = gtk_page_setup_get_paper_height (preview->page,
 452                                                   GTK_UNIT_POINTS);
 453   vik_print_preview_get_page_margins (preview,
 454                                        &left_margin,
 455                                        &right_margin,
 456                                        &top_margin,
 457                                        &bottom_margin);
 458
 459   cr = gdk_cairo_create (widget->window);
 460
 461   scale = vik_print_preview_get_scale (preview);
 462
 463   /* draw background */
 464   cairo_scale (cr, scale, scale);
 465   gdk_cairo_set_source_color (cr, &widget->style->white);
 466   cairo_rectangle (cr, 0, 0, paper_width, paper_height);
 467   cairo_fill (cr);
 468
 469   /* draw page_margins */
 470   gdk_cairo_set_source_color (cr, &widget->style->black);
 471   cairo_rectangle (cr,
 472                    left_margin,
 473                    top_margin,
 474                    paper_width - left_margin - right_margin,
 475                    paper_height - top_margin - bottom_margin);
 476   cairo_stroke (cr);
 477
 478   if (preview->dragging)
 479     {
 480       gint width, height;
 481       gdk_drawable_get_size(preview->drawable, &width, &height);
 482       cairo_rectangle (cr,
 483                        left_margin + preview->image_offset_x,
 484                        top_margin  + preview->image_offset_y,
 485                        (gdouble) width  * 72.0 / preview->image_xres,
 486                        (gdouble) height * 72.0 / preview->image_yres);
 487       cairo_stroke (cr);
 488     }
 489   else
 490     {
 491       GdkDrawable *drawable = preview->drawable;
 492
 493       /* draw image */
 494       cairo_translate (cr,
 495                        left_margin + preview->image_offset_x,
 496                        top_margin  + preview->image_offset_y);
 497
 498       if (preview->pixbuf == NULL)
 499         {
 500           gint width  = MIN (widget->allocation.width, 1024);
 501           gint height = MIN (widget->allocation.height, 1024);
 502
 503           preview->pixbuf = get_thumbnail(drawable, width, height);
 504         }
 505
 506       if (preview->pixbuf != NULL)
 507         {
 508           gint width, height;
 509           gdk_drawable_get_size(drawable, &width, &height);
 510
 511           gdouble scale_x = ((gdouble) width /
 512                              gdk_pixbuf_get_width (preview->pixbuf));
 513           gdouble scale_y = ((gdouble) height /
 514                              gdk_pixbuf_get_height (preview->pixbuf));
 515
 516           scale_x = scale_x * 72.0 / preview->image_xres;
 517           scale_y = scale_y * 72.0 / preview->image_yres;
 518
 519           cairo_scale (cr, scale_x, scale_y);
 520
 521           gdk_cairo_set_source_pixbuf (cr, preview->pixbuf, 0, 0);
 522
 523           cairo_paint (cr);
 524         }
 525     }
 526
 527   cairo_destroy (cr);
 528
 529   return FALSE;
 530 }
 531
 532 static gdouble
 533 vik_print_preview_get_scale (VikPrintPreview* preview)
 534 {
 535   gdouble scale_x;
 536   gdouble scale_y;
 537
 538   scale_x = ((gdouble) preview->area->allocation.width /
 539              gtk_page_setup_get_paper_width (preview->page, GTK_UNIT_POINTS));
 540
 541   scale_y = ((gdouble) preview->area->allocation.height /
 542              gtk_page_setup_get_paper_height (preview->page, GTK_UNIT_POINTS));
 543
 544   return MIN (scale_x, scale_y);
 545 }
 546
 547 static void
 548 vik_print_preview_size_allocate (GtkWidget        *widget,
 549                                   GtkAllocation    *allocation,
 550                                   VikPrintPreview *preview)
 551 {
 552   if (preview->pixbuf != NULL)
 553     {
 554       g_object_unref (preview->pixbuf);
 555       preview->pixbuf = NULL;
 556     }
 557 }
 558
 559 static void
 560 vik_print_preview_get_page_margins (VikPrintPreview *preview,
 561                                      gdouble          *left_margin,
 562                                      gdouble          *right_margin,
 563                                      gdouble          *top_margin,
 564                                      gdouble          *bottom_margin)
 565 {
 566   if (preview->use_full_page)
 567     {
 568       *left_margin   = 0.0;
 569       *right_margin  = 0.0;
 570       *top_margin    = 0.0;
 571       *bottom_margin = 0.0;
 572     }
 573   else
 574     {
 575       *left_margin   = gtk_page_setup_get_left_margin (preview->page,
 576                                                        GTK_UNIT_POINTS);
 577       *right_margin  = gtk_page_setup_get_right_margin (preview->page,
 578                                                         GTK_UNIT_POINTS);
 579       *top_margin    = gtk_page_setup_get_top_margin (preview->page,
 580                                                       GTK_UNIT_POINTS);
 581       *bottom_margin = gtk_page_setup_get_bottom_margin (preview->page,
 582                                                          GTK_UNIT_POINTS);
 583     }
 584 }
 585
 586 static void
 587 print_preview_queue_draw (VikPrintPreview *preview)
 588 {
 589   gtk_widget_queue_draw (GTK_WIDGET (preview->area));
 590 }
 591
 592 #endif