libs/gtkmm2ext/fastmeter.cc

   1 /*
   2     Copyright (C) 2003-2006 Paul 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 <iostream>
  22 #include <cmath>
  23 #include <algorithm>
  24 #include <gdkmm/rectangle.h>
  25 #include <gtkmm2ext/fastmeter.h>
  26 #include <gtkmm2ext/utils.h>
  27 #include <gtkmm/style.h>
  28 #include <cstring>
  29
  30 #define UINT_TO_RGB(u,r,g,b) { (*(r)) = ((u)>>16)&0xff; (*(g)) = ((u)>>8)&0xff; (*(b)) = (u)&0xff; }
  31 #define UINT_TO_RGBA(u,r,g,b,a) { UINT_TO_RGB(((u)>>8),r,g,b); (*(a)) = (u)&0xff; }
  32 using namespace Gtk;
  33 using namespace Gdk;
  34 using namespace Glib;
  35 using namespace Gtkmm2ext;
  36 using namespace std;
  37
  38
  39 int FastMeter::min_v_pixbuf_size = 10;
  40 int FastMeter::max_v_pixbuf_size = 1024;
  41 Glib::RefPtr<Gdk::Pixbuf>* FastMeter::v_pixbuf_cache = 0;
  42
  43 int FastMeter::min_h_pixbuf_size = 10;
  44 int FastMeter::max_h_pixbuf_size = 1024;
  45 Glib::RefPtr<Gdk::Pixbuf>* FastMeter::h_pixbuf_cache = 0;
  46
  47 int FastMeter::_clr0 = 0;
  48 int FastMeter::_clr1 = 0;
  49 int FastMeter::_clr2 = 0;
  50 int FastMeter::_clr3 = 0;
  51
  52 FastMeter::FastMeter (long hold, unsigned long dimen, Orientation o, int len, int clr0, int clr1, int clr2, int clr3)
  53 {
  54         orientation = o;
  55         hold_cnt = hold;
  56         hold_state = 0;
  57         current_peak = 0;
  58         current_level = 0;
  59         last_peak_rect.width = 0;
  60         last_peak_rect.height = 0;
  61         _clr0 = clr0;
  62         _clr1 = clr1;
  63         _clr2 = clr2;
  64         _clr3 = clr3;
  65
  66         set_events (BUTTON_PRESS_MASK|BUTTON_RELEASE_MASK);
  67
  68         pixrect.x = 0;
  69         pixrect.y = 0;
  70
  71         if (orientation == Vertical) {
  72                 if (!len)
  73                         len = 250;
  74                 pixbuf = request_vertical_meter(dimen, len);
  75         } else {
  76                 if (!len)
  77                         len = 186;
  78                 pixbuf = request_horizontal_meter(len, dimen);
  79         }
  80
  81         pixheight = pixbuf->get_height();
  82         pixwidth  = pixbuf->get_width();
  83
  84         if (orientation == Vertical) {
  85                 pixrect.width = min (pixwidth, (gint) dimen);
  86                 pixrect.height = pixheight;
  87         } else {
  88                 pixrect.width = pixwidth;
  89                 pixrect.height = min (pixheight, (gint) dimen);
  90         }
  91
  92         request_width = pixrect.width;
  93         request_height= pixrect.height;
  94 }
  95
  96 Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_vertical_meter(int width, int height)
  97 {
  98         if (height < min_v_pixbuf_size)
  99                 height = min_v_pixbuf_size;
 100         if (height > max_v_pixbuf_size)
 101                 height = max_v_pixbuf_size;
 102
 103         //int index = height - 1;
 104
 105         //if (v_pixbuf_cache == 0) {
 106         //      v_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
 107         //      memset(v_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
 108         //}
 109         Glib::RefPtr<Gdk::Pixbuf> ret;// = v_pixbuf_cache[index];
 110         //if (ret)
 111         //      return ret;
 112
 113         guint8* data;
 114
 115         data = (guint8*) malloc(width*height * 3);
 116
 117         guint8 r,g,b,r0,g0,b0,r1,g1,b1,r2,g2,b2,r3,g3,b3,a;
 118
 119         UINT_TO_RGBA (_clr0, &r0, &g0, &b0, &a);
 120         UINT_TO_RGBA (_clr1, &r1, &g1, &b1, &a);
 121         UINT_TO_RGBA (_clr2, &r2, &g2, &b2, &a);
 122         UINT_TO_RGBA (_clr3, &r3, &g3, &b3, &a);
 123         // fake log calculation copied from log_meter.h
 124         // actual calculation:
 125         // log_meter(0.0f) =
 126         //  def = (0.0f + 20.0f) * 2.5f + 50f
 127         //  return def / 115.0f
 128         int knee = (int)floor((float)height * 100.0f / 115.0f);
 129         int y;
 130
 131         for (y = 0; y < knee/2; y++) {
 132
 133                 r = (guint8)floor((float)abs(r1 - r0) * (float)y / (float)(knee/2));
 134                 (r0 >= r1) ? r = r0 - r : r += r0;
 135
 136                 g = (guint8)floor((float)abs(g1 - g0) * (float)y / (float)(knee/2));
 137                 (g0 >= g1) ? g = g0 - g : g += g0;
 138
 139                 b = (guint8)floor((float)abs(b1 - b0) * (float)y / (float)(knee/2));
 140                 (b0 >= b1) ? b = b0 - b : b += b0;
 141
 142                 for (int x = 0; x < width; x++) {
 143                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 144                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 145                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 146                 }
 147         }
 148
 149         int offset = knee - y;
 150         for (int i=0; i < offset; i++,y++) {
 151
 152                 r = (guint8)floor((float)abs(r2 - r1) * (float)i / (float)offset);
 153                 (r1 >= r2) ? r = r1 - r : r += r1;
 154
 155                 g = (guint8)floor((float)abs(g2 - g1) * (float)i / (float)offset);
 156                 (g1 >= g2) ? g = g1 - g : g += g1;
 157
 158                 b = (guint8)floor((float)abs(b2 - b1) * (float)i / (float)offset);
 159                 (b1 >= b2) ? b = b1 - b : b += b1;
 160
 161                 for (int x = 0; x < width; x++) {
 162                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 163                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 164                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 165                 }
 166         }
 167         y--;
 168         for (; y < height; y++) {
 169                 for (int x = 0; x < width; x++) {
 170                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r3;
 171                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g3;
 172                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b3;
 173                 }
 174         }
 175
 176         ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
 177         //v_pixbuf_cache[index] = ret;
 178
 179         return ret;
 180 }
 181
 182 Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_horizontal_meter(int width, int height)
 183 {
 184         if (width < min_h_pixbuf_size)
 185                 width = min_h_pixbuf_size;
 186         if (width > max_h_pixbuf_size)
 187                 width = max_h_pixbuf_size;
 188
 189         int index = width - 1;
 190
 191         if (h_pixbuf_cache == 0) {
 192                 h_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
 193                 memset(h_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
 194         }
 195         Glib::RefPtr<Gdk::Pixbuf> ret = h_pixbuf_cache[index];
 196         if (ret)
 197                 return ret;
 198
 199         guint8* data;
 200
 201         data = (guint8*) malloc(width*height * 3);
 202
 203         guint8 r,g,b;
 204         r=0;
 205         g=255;
 206         b=0;
 207
 208         // fake log calculation copied from log_meter.h
 209         // actual calculation:
 210         // log_meter(0.0f) =
 211         //  def = (0.0f + 20.0f) * 2.5f + 50f
 212         //  return def / 115.0f
 213         int knee = (int)floor((float)width * 100.0f / 115.0f);
 214
 215         int x;
 216
 217         for (x = 0; x < knee / 2; x++) {
 218
 219                 r = (guint8)floor(255.0 * (float)x/(float)(knee / 2));
 220
 221                 for (int y = 0; y < height; y++) {
 222                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 223                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 224                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 225                 }
 226         }
 227
 228         for (; x < knee; x++) {
 229
 230                 g = 255 - (guint8)floor(170.0 * (float)(x - knee/ 2)/(float)(knee / 2));
 231
 232                 for (int y = 0; y < height; y++) {
 233                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 234                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 235                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 236                 }
 237         }
 238
 239         r=255;
 240         g=0;
 241         b=0;
 242         for (; x < width; x++) {
 243                 for (int y = 0; y < height; y++) {
 244                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 245                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 246                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 247                 }
 248         }
 249
 250         ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
 251         h_pixbuf_cache[index] = ret;
 252
 253         return ret;
 254 }
 255
 256 FastMeter::~FastMeter ()
 257 {
 258 }
 259
 260 void
 261 FastMeter::set_hold_count (long val)
 262 {
 263         if (val < 1) {
 264                 val = 1;
 265         }
 266
 267         hold_cnt = val;
 268         hold_state = 0;
 269         current_peak = 0;
 270
 271         queue_draw ();
 272 }
 273
 274 void
 275 FastMeter::on_size_request (GtkRequisition* req)
 276 {
 277         if (orientation == Vertical) {
 278
 279                 req->height = request_height;
 280                 req->height = max(req->height, min_v_pixbuf_size);
 281                 req->height = min(req->height, max_v_pixbuf_size);
 282
 283                 req->width  = request_width;
 284
 285         } else {
 286
 287                 req->width  = request_width;
 288                 req->width  = max(req->width,  min_h_pixbuf_size);
 289                 req->width  = min(req->width,  max_h_pixbuf_size);
 290
 291                 req->height = request_height;
 292         }
 293
 294 }
 295
 296 void
 297 FastMeter::on_size_allocate (Gtk::Allocation &alloc)
 298 {
 299         if (orientation == Vertical) {
 300
 301                 if (alloc.get_width() != request_width) {
 302                         alloc.set_width (request_width);
 303                 }
 304
 305                 int h = alloc.get_height();
 306                 h = max(h, min_v_pixbuf_size);
 307                 h = min(h, max_v_pixbuf_size);
 308
 309                 if ( h != alloc.get_height())
 310                         alloc.set_height(h);
 311
 312                 if (pixheight != h) {
 313                         pixbuf = request_vertical_meter(request_width, h);
 314                 }
 315
 316         } else {
 317
 318                 if (alloc.get_height() != request_height) {
 319                         alloc.set_height(request_height);
 320                 }
 321
 322                 int w = alloc.get_width();
 323                 w = max(w, min_h_pixbuf_size);
 324                 w = min(w, max_h_pixbuf_size);
 325
 326                 if ( w != alloc.get_width())
 327                         alloc.set_width(w);
 328
 329                 if (pixwidth != w) {
 330                         pixbuf = request_horizontal_meter(w, request_height);
 331                 }
 332         }
 333
 334         pixheight = pixbuf->get_height();
 335         pixwidth  = pixbuf->get_width();
 336
 337         DrawingArea::on_size_allocate(alloc);
 338 }
 339
 340 bool
 341 FastMeter::on_expose_event (GdkEventExpose* ev)
 342 {
 343         if (orientation == Vertical) {
 344                 return vertical_expose (ev);
 345         } else {
 346                 return horizontal_expose (ev);
 347         }
 348 }
 349
 350 bool
 351 FastMeter::vertical_expose (GdkEventExpose* ev)
 352 {
 353         gint top_of_meter;
 354         GdkRectangle intersection;
 355         GdkRectangle background;
 356
 357         top_of_meter = (gint) floor (pixheight * current_level);
 358
 359         /* reset the height & origin of the rect that needs to show the pixbuf
 360          */
 361
 362         pixrect.height = top_of_meter;
 363         pixrect.y = pixheight - top_of_meter;
 364
 365         background.x = 0;
 366         background.y = 0;
 367         background.width = pixrect.width;
 368         background.height = pixheight - top_of_meter;
 369
 370         if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
 371                 get_window()->draw_rectangle (get_style()->get_black_gc(), true,
 372                                               intersection.x, intersection.y,
 373                                               intersection.width, intersection.height);
 374         }
 375
 376         if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
 377                 // draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
 378                 get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
 379                                           intersection.x, intersection.y,
 380                                           intersection.x, intersection.y,
 381                                           intersection.width, intersection.height,
 382                                           Gdk::RGB_DITHER_NONE, 0, 0);
 383         }
 384
 385         // draw peak bar
 386
 387         if (hold_state) {
 388                 last_peak_rect.x = 0;
 389                 last_peak_rect.width = pixwidth;
 390                 last_peak_rect.y = pixheight - (gint) floor (pixheight * current_peak);
 391                 last_peak_rect.height = min(3, pixheight - last_peak_rect.y);
 392
 393                 get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
 394                                            0, last_peak_rect.y,
 395                                            0, last_peak_rect.y,
 396                                            pixwidth, last_peak_rect.height,
 397                                            Gdk::RGB_DITHER_NONE, 0, 0);
 398         } else {
 399                 last_peak_rect.width = 0;
 400                 last_peak_rect.height = 0;
 401         }
 402
 403         return TRUE;
 404 }
 405
 406 bool
 407 FastMeter::horizontal_expose (GdkEventExpose* ev)
 408 {
 409         gint right_of_meter;
 410         GdkRectangle intersection;
 411         GdkRectangle background;
 412
 413         right_of_meter = (gint) floor (pixwidth * current_level);
 414         pixrect.width = right_of_meter;
 415
 416         background.x = 0;
 417         background.y = 0;
 418         background.width  = pixwidth - right_of_meter;
 419         background.height = pixrect.height;
 420
 421         if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
 422                 get_window()->draw_rectangle (get_style()->get_black_gc(), true,
 423                                               intersection.x + right_of_meter, intersection.y,
 424                                               intersection.width, intersection.height);
 425         }
 426
 427         if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
 428                 // draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
 429                 get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
 430                                           intersection.x, intersection.y,
 431                                           intersection.x, intersection.y,
 432                                           pixrect.width, intersection.height,
 433                                           Gdk::RGB_DITHER_NONE, 0, 0);
 434         }
 435
 436         // draw peak bar
 437         // XXX: peaks don't work properly
 438         /*
 439         if (hold_state && intersection.height > 0) {
 440                 gint x = (gint) floor(pixwidth * current_peak);
 441
 442                 get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
 443                                            x, intersection.y,
 444                                            x, intersection.y,
 445                                            3, intersection.height,
 446                                            Gdk::RGB_DITHER_NONE, 0, 0);
 447         }
 448         */
 449
 450         return true;
 451 }
 452
 453 void
 454 FastMeter::set (float lvl)
 455 {
 456         float old_level = current_level;
 457         float old_peak = current_peak;
 458
 459         current_level = lvl;
 460
 461         if (lvl > current_peak) {
 462                 current_peak = lvl;
 463                 hold_state = hold_cnt;
 464         }
 465
 466         if (hold_state > 0) {
 467                 if (--hold_state == 0) {
 468                         current_peak = lvl;
 469                 }
 470         }
 471
 472         if (current_level == old_level && current_peak == old_peak && hold_state == 0) {
 473                 return;
 474         }
 475
 476
 477         Glib::RefPtr<Gdk::Window> win;
 478
 479         if ((win = get_window()) == 0) {
 480                 queue_draw ();
 481                 return;
 482         }
 483
 484         if (orientation == Vertical) {
 485                 queue_vertical_redraw (win, old_level);
 486         } else {
 487                 queue_horizontal_redraw (win, old_level);
 488         }
 489 }
 490
 491 void
 492 FastMeter::queue_vertical_redraw (const Glib::RefPtr<Gdk::Window>& win, float old_level)
 493 {
 494         GdkRectangle rect;
 495
 496         gint new_top = (gint) floor (pixheight * current_level);
 497
 498         rect.x = 0;
 499         rect.width = pixwidth;
 500         rect.height = new_top;
 501         rect.y = pixheight - new_top;
 502
 503         if (current_level > old_level) {
 504                 /* colored/pixbuf got larger, just draw the new section */
 505                 /* rect.y stays where it is because of X coordinates */
 506                 /* height of invalidated area is between new.y (smaller) and old.y
 507                    (larger).
 508                    X coordinates just make my brain hurt.
 509                 */
 510                 rect.height = pixrect.y - rect.y;
 511         } else {
 512                 /* it got smaller, compute the difference */
 513                 /* rect.y becomes old.y (the smaller value) */
 514                 rect.y = pixrect.y;
 515                 /* rect.height is the old.y (smaller) minus the new.y (larger)
 516                 */
 517                 rect.height = pixrect.height - rect.height;
 518         }
 519
 520         GdkRegion* region = 0;
 521         bool queue = false;
 522
 523         if (rect.height != 0) {
 524
 525                 /* ok, first region to draw ... */
 526
 527                 region = gdk_region_rectangle (&rect);
 528                 queue = true;
 529         }
 530
 531         /* redraw the last place where the last peak hold bar was;
 532            the next expose will draw the new one whether its part of
 533            expose region or not.
 534         */
 535
 536         if (last_peak_rect.width * last_peak_rect.height != 0) {
 537                 if (!queue) {
 538                         region = gdk_region_new ();
 539                         queue = true;
 540                 }
 541                 gdk_region_union_with_rect (region, &last_peak_rect);
 542         }
 543
 544         if (queue) {
 545                 gdk_window_invalidate_region (win->gobj(), region, true);
 546         }
 547         if (region) {
 548                 gdk_region_destroy(region);
 549                 region = 0;
 550         }
 551 }
 552
 553 void
 554 FastMeter::queue_horizontal_redraw (const Glib::RefPtr<Gdk::Window>& win, float old_level)
 555 {
 556         /* XXX OPTIMIZE (when we have some horizontal meters) */
 557         queue_draw ();
 558 }
 559
 560 void
 561 FastMeter::clear ()
 562 {
 563         current_level = 0;
 564         current_peak = 0;
 565         hold_state = 0;
 566         queue_draw ();
 567 }