libs/gtkmm2ext/utils.cc

   1 /*
   2     Copyright (C) 1999 Paul Barton-Davis
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     $Id$
  19 */
  20
  21 #include <map>
  22
  23 #include <gtk/gtkpaned.h>
  24 #include <gtk/gtk.h>
  25
  26 #include <gtkmm2ext/utils.h>
  27 #include <gtkmm/widget.h>
  28 #include <gtkmm/button.h>
  29 #include <gtkmm/window.h>
  30 #include <gtkmm/paned.h>
  31 #include <gtkmm/comboboxtext.h>
  32
  33 #include "i18n.h"
  34
  35 using namespace std;
  36
  37 void
  38 Gtkmm2ext::init ()
  39 {
  40         // Necessary for gettext
  41         (void) bindtextdomain(PACKAGE, LOCALEDIR);
  42 }
  43
  44 void
  45 Gtkmm2ext::get_ink_pixel_size (Glib::RefPtr<Pango::Layout> layout,
  46                                int& width,
  47                                int& height)
  48 {
  49         Pango::Rectangle ink_rect = layout->get_ink_extents ();
  50
  51         width = (ink_rect.get_width() + PANGO_SCALE / 2) / PANGO_SCALE;
  52         height = (ink_rect.get_height() + PANGO_SCALE / 2) / PANGO_SCALE;
  53 }
  54
  55 void
  56 get_pixel_size (Glib::RefPtr<Pango::Layout> layout,
  57                                int& width,
  58                                int& height)
  59 {
  60         layout->get_pixel_size (width, height);
  61 }
  62
  63 void
  64 Gtkmm2ext::set_size_request_to_display_given_text (Gtk::Widget &w, const gchar *text,
  65                                                    gint hpadding, gint vpadding)
  66
  67 {
  68         int width, height;
  69         w.ensure_style ();
  70
  71         get_pixel_size (w.create_pango_layout (text), width, height);
  72         w.set_size_request(width + hpadding, height + vpadding);
  73 }
  74
  75 void
  76 Gtkmm2ext::set_size_request_to_display_given_text (Gtk::Widget &w,
  77                                                    const std::vector<std::string>& strings,
  78                                                    gint hpadding, gint vpadding)
  79
  80 {
  81         int width, height;
  82         int width_max = 0;
  83         int height_max = 0;
  84         w.ensure_style ();
  85         vector<string> copy;
  86         const vector<string>* to_use;
  87         vector<string>::const_iterator i;
  88
  89         for (i = strings.begin(); i != strings.end(); ++i) {
  90                 if ((*i).find_first_of ("gy") != string::npos) {
  91                         /* contains a descender */
  92                         break;
  93                 }
  94         }
  95
  96         if (i == strings.end()) {
  97                 /* make a copy of the strings then add one that has a descener */
  98                 copy = strings;
  99                 copy.push_back ("g");
 100                 to_use = &copy;
 101         } else {
 102                 to_use = &strings;
 103         }
 104
 105         for (vector<string>::const_iterator i = to_use->begin(); i != to_use->end(); ++i) {
 106                 get_pixel_size (w.create_pango_layout (*i), width, height);
 107                 width_max = max(width_max,width);
 108                 height_max = max(height_max, height);
 109         }
 110
 111         w.set_size_request(width_max + hpadding, height_max + vpadding);
 112 }
 113
 114 static inline guint8
 115 demultiply_alpha (guint8 src,
 116                   guint8 alpha)
 117 {
 118         /* cairo pixel buffer data contains RGB values with the alpha
 119            values premultiplied.
 120
 121            GdkPixbuf pixel buffer data contains RGB values without the
 122            alpha value applied.
 123
 124            this removes the alpha component from the cairo version and
 125            returns the GdkPixbuf version.
 126         */
 127         return alpha ? ((guint (src) << 8) - src) / alpha : 0;
 128 }
 129
 130 static void
 131 convert_bgra_to_rgba (guint8 const* src,
 132                       guint8*       dst,
 133                       int           width,
 134                       int           height)
 135 {
 136         guint8 const* src_pixel = src;
 137         guint8*       dst_pixel = dst;
 138
 139         /* cairo pixel data is endian-dependent ARGB with A in the most significant 8 bits,
 140            with premultipled alpha values (see preceding function)
 141
 142            GdkPixbuf pixel data is non-endian-dependent RGBA with R in the lowest addressable
 143            8 bits, and non-premultiplied alpha values.
 144
 145            convert from the cairo values to the GdkPixbuf ones.
 146         */
 147
 148         for (int y = 0; y < height; y++) {
 149                 for (int x = 0; x < width; x++) {
 150 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 151                         /* Cairo [ B G R A ] is actually  [ B G R A ] in memory SOURCE
 152                                                             0 1 2 3
 153                            Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
 154                         */
 155                         dst_pixel[0] = demultiply_alpha (src_pixel[2],
 156                                                          src_pixel[3]); // R [0] <= [ 2 ]
 157                         dst_pixel[1] = demultiply_alpha (src_pixel[1],
 158                                                          src_pixel[3]); // G [1] <= [ 1 ]
 159                         dst_pixel[2] = demultiply_alpha (src_pixel[0],
 160                                                          src_pixel[3]); // B [2] <= [ 0 ]
 161                         dst_pixel[3] = src_pixel[3]; // alpha
 162
 163 #elif G_BYTE_ORDER == G_BIG_ENDIAN
 164                         /* Cairo [ B G R A ] is actually  [ A R G B ] in memory SOURCE
 165                                                             0 1 2 3
 166                            Pixbuf [ R G B A ] is actually [ R G B A ] in memory DEST
 167                         */
 168                         dst_pixel[0] = demultiply_alpha (src_pixel[1],
 169                                                          src_pixel[0]); // R [0] <= [ 1 ]
 170                         dst_pixel[1] = demultiply_alpha (src_pixel[2],
 171                                                          src_pixel[0]); // G [1] <= [ 2 ]
 172                         dst_pixel[2] = demultiply_alpha (src_pixel[3],
 173                                                          src_pixel[0]); // B [2] <= [ 3 ]
 174                         dst_pixel[3] = src_pixel[0]; // alpha
 175
 176 #else
 177 #error ardour does not currently support PDP-endianess
 178 #endif
 179
 180                         dst_pixel += 4;
 181                         src_pixel += 4;
 182                 }
 183         }
 184 }
 185
 186 Glib::RefPtr<Gdk::Pixbuf>
 187 Gtkmm2ext::pixbuf_from_string(const string& name, Pango::FontDescription* font, int clip_width, int clip_height, Gdk::Color fg)
 188 {
 189         static Glib::RefPtr<Gdk::Pixbuf>* empty_pixbuf = 0;
 190
 191         if (name.empty()) {
 192                 if (empty_pixbuf == 0) {
 193                         empty_pixbuf = new Glib::RefPtr<Gdk::Pixbuf>;
 194                         *empty_pixbuf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, true, 8, clip_width, clip_height);
 195                 }
 196                 return *empty_pixbuf;
 197         }
 198
 199         Glib::RefPtr<Gdk::Pixbuf> buf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, true, 8, clip_width, clip_height);
 200
 201         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, clip_width, clip_height);
 202         cairo_t* cr = cairo_create (surface);
 203         cairo_text_extents_t te;
 204
 205         cairo_set_source_rgba (cr, fg.get_red_p(), fg.get_green_p(), fg.get_blue_p(), 1.0);
 206         cairo_select_font_face (cr, font->get_family().c_str(),
 207                                 CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
 208         cairo_set_font_size (cr,  font->get_size() / Pango::SCALE);
 209         cairo_text_extents (cr, name.c_str(), &te);
 210
 211         cairo_move_to (cr, 0.5, int (0.5 - te.height / 2 - te.y_bearing + clip_height / 2));
 212         cairo_show_text (cr, name.c_str());
 213
 214         convert_bgra_to_rgba(cairo_image_surface_get_data (surface), buf->get_pixels(), clip_width, clip_height);
 215
 216         cairo_destroy(cr);
 217         cairo_surface_destroy(surface);
 218
 219         return buf;
 220 }
 221
 222 void
 223 Gtkmm2ext::set_popdown_strings (Gtk::ComboBoxText& cr, const vector<string>& strings, bool set_size, gint hpadding, gint vpadding)
 224 {
 225         vector<string>::const_iterator i;
 226
 227         cr.clear ();
 228
 229         if (set_size) {
 230                 set_size_request_to_display_given_text (cr, strings, COMBO_FUDGE+10+hpadding, 15+vpadding);
 231         }
 232
 233         for (i = strings.begin(); i != strings.end(); ++i) {
 234                 cr.append_text (*i);
 235         }
 236 }
 237
 238 GdkWindow*
 239 Gtkmm2ext::get_paned_handle (Gtk::Paned& paned)
 240 {
 241         return GTK_PANED(paned.gobj())->handle;
 242 }
 243
 244 void
 245 Gtkmm2ext::set_decoration (Gtk::Window* win, Gdk::WMDecoration decor)
 246 {
 247         win->get_window()->set_decorations (decor);
 248 }
 249
 250 void Gtkmm2ext::set_treeview_header_as_default_label(Gtk::TreeViewColumn* c)
 251 {
 252         gtk_tree_view_column_set_widget( c->gobj(), GTK_WIDGET(0) );
 253 }
 254
 255 void
 256 Gtkmm2ext::detach_menu (Gtk::Menu& menu)
 257 {
 258         /* its possible for a Gtk::Menu to have no gobj() because it has
 259            not yet been instantiated. Catch this and provide a safe
 260            detach method.
 261         */
 262         if (menu.gobj()) {
 263                 if (menu.get_attach_widget()) {
 264                         menu.detach ();
 265                 }
 266         }
 267 }
 268
 269 bool
 270 Gtkmm2ext::possibly_translate_keyval_to_make_legal_accelerator (uint32_t& keyval)
 271 {
 272         int fakekey = GDK_VoidSymbol;
 273
 274         switch (keyval) {
 275         case GDK_Tab:
 276         case GDK_ISO_Left_Tab:
 277                 fakekey = GDK_nabla;
 278                 break;
 279
 280         case GDK_Up:
 281                 fakekey = GDK_uparrow;
 282                 break;
 283
 284         case GDK_Down:
 285                 fakekey = GDK_downarrow;
 286                 break;
 287
 288         case GDK_Right:
 289                 fakekey = GDK_rightarrow;
 290                 break;
 291
 292         case GDK_Left:
 293                 fakekey = GDK_leftarrow;
 294                 break;
 295
 296         case GDK_Return:
 297                 fakekey = GDK_3270_Enter;
 298                 break;
 299
 300         case GDK_KP_Enter:
 301                 fakekey = GDK_F35;
 302                 break;
 303
 304         default:
 305                 break;
 306         }
 307
 308         if (fakekey != GDK_VoidSymbol) {
 309                 keyval = fakekey;
 310                 return true;
 311         }
 312
 313         return false;
 314 }
 315
 316 uint32_t
 317 Gtkmm2ext::possibly_translate_legal_accelerator_to_real_key (uint32_t keyval)
 318 {
 319         switch (keyval) {
 320         case GDK_nabla:
 321                 return GDK_Tab;
 322                 break;
 323
 324         case GDK_uparrow:
 325                 return GDK_Up;
 326                 break;
 327
 328         case GDK_downarrow:
 329                 return GDK_Down;
 330                 break;
 331
 332         case GDK_rightarrow:
 333                 return GDK_Right;
 334                 break;
 335
 336         case GDK_leftarrow:
 337                 return GDK_Left;
 338                 break;
 339
 340         case GDK_3270_Enter:
 341                 return GDK_Return;
 342
 343         case GDK_F35:
 344                 return GDK_KP_Enter;
 345                 break;
 346         }
 347
 348         return keyval;
 349 }
 350
 351 int
 352 Gtkmm2ext::physical_screen_height (Glib::RefPtr<Gdk::Window> win)
 353 {
 354         GdkScreen* scr = gdk_screen_get_default();
 355
 356         if (win) {
 357                 GdkRectangle r;
 358                 gint monitor = gdk_screen_get_monitor_at_window (scr, win->gobj());
 359                 gdk_screen_get_monitor_geometry (scr, monitor, &r);
 360                 return r.height;
 361         } else {
 362                 return gdk_screen_get_height (scr);
 363         }
 364 }
 365
 366 int
 367 Gtkmm2ext::physical_screen_width (Glib::RefPtr<Gdk::Window> win)
 368 {
 369         GdkScreen* scr = gdk_screen_get_default();
 370
 371         if (win) {
 372                 GdkRectangle r;
 373                 gint monitor = gdk_screen_get_monitor_at_window (scr, win->gobj());
 374                 gdk_screen_get_monitor_geometry (scr, monitor, &r);
 375                 return r.width;
 376         } else {
 377                 return gdk_screen_get_width (scr);
 378         }
 379 }
 380
 381 void
 382 Gtkmm2ext::container_clear (Gtk::Container& c)
 383 {
 384         list<Gtk::Widget*> children = c.get_children();
 385         for (list<Gtk::Widget*>::iterator child = children.begin(); child != children.end(); ++child) {
 386                 c.remove (**child);
 387         }
 388 }
 389
 390 #if 1
 391 void
 392 Gtkmm2ext::rounded_rectangle (Cairo::RefPtr<Cairo::Context> context, double x, double y, double w, double h, double r)
 393 {
 394         /* renders small shapes better than most others */
 395
 396 /*    A****BQ
 397       H    C
 398       *    *
 399       G    D
 400       F****E
 401 */
 402         context->move_to(x+r,y); // Move to A
 403         context->line_to(x+w-r,y); // Straight line to B
 404         context->curve_to(x+w,y,x+w,y,x+w,y+r); // Curve to C, Control points are both at Q
 405         context->line_to(x+w,y+h-r); // Move to D
 406         context->curve_to(x+w,y+h,x+w,y+h,x+w-r,y+h); // Curve to E
 407         context->line_to(x+r,y+h); // Line to F
 408         context->curve_to(x,y+h,x,y+h,x,y+h-r); // Curve to G
 409         context->line_to(x,y+r); // Line to H
 410         context->curve_to(x,y,x,y,x+r,y); // Curve to A
 411 }
 412
 413 #else
 414
 415 void
 416 Gtkmm2ext::rounded_rectangle (Cairo::RefPtr<Cairo::Context> context, double x, double y, double width, double height, double radius)
 417 {
 418         /* doesn't render small shapes well at all, and does not absolutely honor width & height */
 419
 420         double x0          = x+radius/2.0;
 421         double y0          = y+radius/2.0;
 422         double rect_width  = width - radius;
 423         double rect_height = height - radius;
 424
 425         context->save();
 426
 427         double x1=x0+rect_width;
 428         double y1=y0+rect_height;
 429
 430         if (rect_width/2<radius) {
 431                 if (rect_height/2<radius) {
 432                         context->move_to  (x0, (y0 + y1)/2);
 433                         context->curve_to (x0 ,y0, x0, y0, (x0 + x1)/2, y0);
 434                         context->curve_to (x1, y0, x1, y0, x1, (y0 + y1)/2);
 435                         context->curve_to (x1, y1, x1, y1, (x1 + x0)/2, y1);
 436                         context->curve_to (x0, y1, x0, y1, x0, (y0 + y1)/2);
 437                 } else {
 438                         context->move_to  (x0, y0 + radius);
 439                         context->curve_to (x0 ,y0, x0, y0, (x0 + x1)/2, y0);
 440                         context->curve_to (x1, y0, x1, y0, x1, y0 + radius);
 441                         context->line_to (x1 , y1 - radius);
 442                         context->curve_to (x1, y1, x1, y1, (x1 + x0)/2, y1);
 443                         context->curve_to (x0, y1, x0, y1, x0, y1- radius);
 444                 }
 445         } else {
 446                 if (rect_height/2<radius) {
 447                         context->move_to  (x0, (y0 + y1)/2);
 448                         context->curve_to (x0 , y0, x0 , y0, x0 + radius, y0);
 449                         context->line_to (x1 - radius, y0);
 450                         context->curve_to (x1, y0, x1, y0, x1, (y0 + y1)/2);
 451                         context->curve_to (x1, y1, x1, y1, x1 - radius, y1);
 452                         context->line_to (x0 + radius, y1);
 453                         context->curve_to (x0, y1, x0, y1, x0, (y0 + y1)/2);
 454                 } else {
 455                         context->move_to  (x0, y0 + radius);
 456                         context->curve_to (x0 , y0, x0 , y0, x0 + radius, y0);
 457                         context->line_to (x1 - radius, y0);
 458                         context->curve_to (x1, y0, x1, y0, x1, y0 + radius);
 459                         context->line_to (x1 , y1 - radius);
 460                         context->curve_to (x1, y1, x1, y1, x1 - radius, y1);
 461                         context->line_to (x0 + radius, y1);
 462                         context->curve_to (x0, y1, x0, y1, x0, y1- radius);
 463                 }
 464         }
 465
 466         context->close_path ();
 467         context->restore();
 468 }
 469
 470 #endif