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 <string.h>
  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         _clr0 = clr0;
  60         _clr1 = clr1;
  61         _clr2 = clr2;
  62         _clr3 = clr3;
  63
  64         set_events (BUTTON_PRESS_MASK|BUTTON_RELEASE_MASK);
  65
  66         pixrect.x = 0;
  67         pixrect.y = 0;
  68
  69         if (orientation == Vertical) {
  70                 if (!len)
  71                         len = 250;
  72                 pixbuf = request_vertical_meter(dimen, len);
  73         } else {
  74                 if (!len)
  75                         len = 186;
  76                 pixbuf = request_horizontal_meter(len, dimen);
  77         }
  78
  79         pixheight = pixbuf->get_height();
  80         pixwidth  = pixbuf->get_width();
  81
  82         if (orientation == Vertical) {
  83                 pixrect.width = min (pixwidth, (gint) dimen);
  84                 pixrect.height = pixheight;
  85         } else {
  86                 pixrect.width = pixwidth;
  87                 pixrect.height = min (pixheight, (gint) dimen);
  88         }
  89
  90         request_width = pixrect.width;
  91         request_height= pixrect.height;
  92 }
  93
  94 Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_vertical_meter(int width, int height)
  95 {
  96         if (height < min_v_pixbuf_size)
  97                 height = min_v_pixbuf_size;
  98         if (height > max_v_pixbuf_size)
  99                 height = max_v_pixbuf_size;
 100
 101         //int index = height - 1;
 102
 103         //if (v_pixbuf_cache == 0) {
 104         //      v_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
 105         //      memset(v_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_v_pixbuf_size);
 106         //}
 107         Glib::RefPtr<Gdk::Pixbuf> ret;// = v_pixbuf_cache[index];
 108         //if (ret)
 109         //      return ret;
 110
 111         guint8* data;
 112
 113         data = (guint8*) malloc(width*height * 3);
 114
 115         guint8 r,g,b,r0,g0,b0,r1,g1,b1,r2,g2,b2,r3,g3,b3,a;
 116
 117         UINT_TO_RGBA (_clr0, &r0, &g0, &b0, &a);
 118         UINT_TO_RGBA (_clr1, &r1, &g1, &b1, &a);
 119         UINT_TO_RGBA (_clr2, &r2, &g2, &b2, &a);
 120         UINT_TO_RGBA (_clr3, &r3, &g3, &b3, &a);
 121         // fake log calculation copied from log_meter.h
 122         // actual calculation:
 123         // log_meter(0.0f) =
 124         //  def = (0.0f + 20.0f) * 2.5f + 50f
 125         //  return def / 115.0f
 126         int knee = (int)floor((float)height * 100.0f / 115.0f);
 127         int y;
 128
 129         for (y = 0; y < knee/2; y++) {
 130
 131                 r = (guint8)floor((float)abs(r1 - r0) * (float)y / (float)(knee/2));
 132                 (r0 >= r1) ? r = r0 - r : r += r0;
 133
 134                 g = (guint8)floor((float)abs(g1 - g0) * (float)y / (float)(knee/2));
 135                 (g0 >= g1) ? g = g0 - g : g += g0;
 136
 137                 b = (guint8)floor((float)abs(b1 - b0) * (float)y / (float)(knee/2));
 138                 (b0 >= b1) ? b = b0 - b : b += b0;
 139
 140                 for (int x = 0; x < width; x++) {
 141                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 142                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 143                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 144                 }
 145         }
 146
 147         int offset = knee - y;
 148         for (int i=0; i < offset; i++,y++) {
 149
 150                 r = (guint8)floor((float)abs(r2 - r1) * (float)i / (float)offset);
 151                 (r1 >= r2) ? r = r1 - r : r += r1;
 152
 153                 g = (guint8)floor((float)abs(g2 - g1) * (float)i / (float)offset);
 154                 (g1 >= g2) ? g = g1 - g : g += g1;
 155
 156                 b = (guint8)floor((float)abs(b2 - b1) * (float)i / (float)offset);
 157                 (b1 >= b2) ? b = b1 - b : b += b1;
 158
 159                 for (int x = 0; x < width; x++) {
 160                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 161                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 162                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 163                 }
 164         }
 165         y--;
 166         for (; y < height; y++) {
 167                 for (int x = 0; x < width; x++) {
 168                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r3;
 169                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g3;
 170                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b3;
 171                 }
 172         }
 173
 174         ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
 175         //v_pixbuf_cache[index] = ret;
 176
 177         return ret;
 178 }
 179
 180 Glib::RefPtr<Gdk::Pixbuf> FastMeter::request_horizontal_meter(int width, int height)
 181 {
 182         if (width < min_h_pixbuf_size)
 183                 width = min_h_pixbuf_size;
 184         if (width > max_h_pixbuf_size)
 185                 width = max_h_pixbuf_size;
 186
 187         int index = width - 1;
 188
 189         if (h_pixbuf_cache == 0) {
 190                 h_pixbuf_cache = (Glib::RefPtr<Gdk::Pixbuf>*) malloc(sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
 191                 memset(h_pixbuf_cache,0,sizeof(Glib::RefPtr<Gdk::Pixbuf>) * max_h_pixbuf_size);
 192         }
 193         Glib::RefPtr<Gdk::Pixbuf> ret = h_pixbuf_cache[index];
 194         if (ret)
 195                 return ret;
 196
 197         guint8* data;
 198
 199         data = (guint8*) malloc(width*height * 3);
 200
 201         guint8 r,g,b;
 202         r=0;
 203         g=255;
 204         b=0;
 205
 206         // fake log calculation copied from log_meter.h
 207         // actual calculation:
 208         // log_meter(0.0f) =
 209         //  def = (0.0f + 20.0f) * 2.5f + 50f
 210         //  return def / 115.0f
 211         int knee = (int)floor((float)width * 100.0f / 115.0f);
 212
 213         int x;
 214
 215         for (x = 0; x < knee / 2; x++) {
 216
 217                 r = (guint8)floor(255.0 * (float)x/(float)(knee / 2));
 218
 219                 for (int y = 0; y < height; y++) {
 220                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 221                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 222                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 223                 }
 224         }
 225
 226         for (; x < knee; x++) {
 227
 228                 g = 255 - (guint8)floor(170.0 * (float)(x - knee/ 2)/(float)(knee / 2));
 229
 230                 for (int y = 0; y < height; y++) {
 231                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 232                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 233                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 234                 }
 235         }
 236
 237         r=255;
 238         g=0;
 239         b=0;
 240         for (; x < width; x++) {
 241                 for (int y = 0; y < height; y++) {
 242                         data[ (x+(height-y-1)*width) * 3 + 0 ] = r;
 243                         data[ (x+(height-y-1)*width) * 3 + 1 ] = g;
 244                         data[ (x+(height-y-1)*width) * 3 + 2 ] = b;
 245                 }
 246         }
 247
 248         ret = Pixbuf::create_from_data(data, COLORSPACE_RGB, false, 8, width, height, width * 3);
 249         h_pixbuf_cache[index] = ret;
 250
 251         return ret;
 252 }
 253
 254 FastMeter::~FastMeter ()
 255 {
 256 }
 257
 258 void
 259 FastMeter::set_hold_count (long val)
 260 {
 261         if (val < 1) {
 262                 val = 1;
 263         }
 264
 265         hold_cnt = val;
 266         hold_state = 0;
 267         current_peak = 0;
 268
 269         queue_draw ();
 270 }
 271
 272 void
 273 FastMeter::on_size_request (GtkRequisition* req)
 274 {
 275         if (orientation == Vertical) {
 276
 277                 req->height = request_height;
 278                 req->height = max(req->height, min_v_pixbuf_size);
 279                 req->height = min(req->height, max_v_pixbuf_size);
 280
 281                 req->width  = request_width;
 282
 283         } else {
 284
 285                 req->width  = request_width;
 286                 req->width  = max(req->width,  min_h_pixbuf_size);
 287                 req->width  = min(req->width,  max_h_pixbuf_size);
 288
 289                 req->height = request_height;
 290         }
 291
 292 }
 293
 294 void
 295 FastMeter::on_size_allocate (Gtk::Allocation &alloc)
 296 {
 297         if (orientation == Vertical) {
 298
 299                 if (alloc.get_width() != request_width) {
 300                         alloc.set_width (request_width);
 301                 }
 302
 303                 int h = alloc.get_height();
 304                 h = max(h, min_v_pixbuf_size);
 305                 h = min(h, max_v_pixbuf_size);
 306
 307                 if ( h != alloc.get_height())
 308                         alloc.set_height(h);
 309
 310                 if (pixheight != h) {
 311                         pixbuf = request_vertical_meter(request_width, h);
 312                 }
 313
 314         } else {
 315
 316                 if (alloc.get_height() != request_height) {
 317                         alloc.set_height(request_height);
 318                 }
 319
 320                 int w = alloc.get_width();
 321                 w = max(w, min_h_pixbuf_size);
 322                 w = min(w, max_h_pixbuf_size);
 323
 324                 if ( w != alloc.get_width())
 325                         alloc.set_width(w);
 326
 327                 if (pixwidth != w) {
 328                         pixbuf = request_horizontal_meter(w, request_height);
 329                 }
 330         }
 331
 332         pixheight = pixbuf->get_height();
 333         pixwidth  = pixbuf->get_width();
 334
 335         DrawingArea::on_size_allocate(alloc);
 336 }
 337
 338 bool
 339 FastMeter::on_expose_event (GdkEventExpose* ev)
 340 {
 341         if (orientation == Vertical) {
 342                 return vertical_expose (ev);
 343         } else {
 344                 return horizontal_expose (ev);
 345         }
 346 }
 347
 348 bool
 349 FastMeter::vertical_expose (GdkEventExpose* ev)
 350 {
 351         gint top_of_meter;
 352         GdkRectangle intersection;
 353         GdkRectangle background;
 354
 355         top_of_meter = (gint) floor (pixheight * current_level);
 356
 357         /* reset the height & origin of the rect that needs to show the pixbuf
 358          */
 359
 360         pixrect.height = top_of_meter;
 361         pixrect.y = pixheight - top_of_meter;
 362
 363         background.x = 0;
 364         background.y = 0;
 365         background.width = pixrect.width;
 366         background.height = pixheight - top_of_meter;
 367
 368         if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
 369                 get_window()->draw_rectangle (get_style()->get_black_gc(), true,
 370                                               intersection.x, intersection.y,
 371                                               intersection.width, intersection.height);
 372         }
 373
 374         if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
 375                 // draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
 376                 get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
 377                                           intersection.x, intersection.y,
 378                                           intersection.x, intersection.y,
 379                                           intersection.width, intersection.height,
 380                                           Gdk::RGB_DITHER_NONE, 0, 0);
 381         }
 382
 383         // draw peak bar
 384         if (hold_state && intersection.width > 0) {
 385                 gint y = pixheight - (gint) floor (pixheight * current_peak);
 386                 int h = min(3, pixheight - y);
 387
 388                 get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
 389                                            intersection.x, y,
 390                                            intersection.x, y,
 391                                            intersection.width, h,
 392                                            Gdk::RGB_DITHER_NONE, 0, 0);
 393         }
 394
 395         return TRUE;
 396 }
 397
 398 bool
 399 FastMeter::horizontal_expose (GdkEventExpose* ev)
 400 {
 401         gint right_of_meter;
 402         GdkRectangle intersection;
 403         GdkRectangle background;
 404
 405         right_of_meter = (gint) floor (pixwidth * current_level);
 406         pixrect.width = right_of_meter;
 407
 408         background.x = 0;
 409         background.y = 0;
 410         background.width  = pixwidth - right_of_meter;
 411         background.height = pixrect.height;
 412
 413         if (gdk_rectangle_intersect (&background, &ev->area, &intersection)) {
 414                 get_window()->draw_rectangle (get_style()->get_black_gc(), true,
 415                                               intersection.x + right_of_meter, intersection.y,
 416                                               intersection.width, intersection.height);
 417         }
 418
 419         if (gdk_rectangle_intersect (&pixrect, &ev->area, &intersection)) {
 420                 // draw the part of the meter image that we need. the area we draw is bounded "in reverse" (top->bottom)
 421                 get_window()->draw_pixbuf(get_style()->get_fg_gc(get_state()), pixbuf,
 422                                           intersection.x, intersection.y,
 423                                           intersection.x, intersection.y,
 424                                           pixrect.width, intersection.height,
 425                                           Gdk::RGB_DITHER_NONE, 0, 0);
 426         }
 427
 428         // draw peak bar
 429         // XXX: peaks don't work properly
 430         /*
 431         if (hold_state && intersection.height > 0) {
 432                 gint x = (gint) floor(pixwidth * current_peak);
 433
 434                 get_window()->draw_pixbuf (get_style()->get_fg_gc(get_state()), pixbuf,
 435                                            x, intersection.y,
 436                                            x, intersection.y,
 437                                            3, intersection.height,
 438                                            Gdk::RGB_DITHER_NONE, 0, 0);
 439         }
 440         */
 441
 442         return true;
 443 }
 444
 445 void
 446 FastMeter::set (float lvl)
 447 {
 448         current_level = lvl;
 449
 450         if (lvl > current_peak) {
 451                 current_peak = lvl;
 452                 hold_state = hold_cnt;
 453         }
 454
 455         if (hold_state > 0) {
 456                 if (--hold_state == 0) {
 457                         current_peak = lvl;
 458                 }
 459         }
 460
 461         queue_draw ();
 462 }
 463
 464 void
 465 FastMeter::clear ()
 466 {
 467         current_level = 0;
 468         current_peak = 0;
 469         hold_state = 0;
 470         queue_draw ();
 471 }