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