src/ctl_led.cpp

   1 /* Calf DSP Library
   2  * Light emitting diode-like control.
   3  *
   4  * Copyright (C) 2008 Krzysztof Foltman
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA  02110-1301  USA
  20  */
  21 #include <calf/ctl_led.h>
  22 #include <math.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25
  26 GtkWidget *
  27 calf_led_new()
  28 {
  29     GtkWidget *widget = GTK_WIDGET( g_object_new (CALF_TYPE_LED, NULL ));
  30     return widget;
  31 }
  32
  33 static gboolean
  34 calf_led_expose (GtkWidget *widget, GdkEventExpose *event)
  35 {
  36     g_assert(CALF_IS_LED(widget));
  37
  38     CalfLed *self = CALF_LED(widget);
  39     GdkWindow *window = widget->window;
  40     cairo_t *c = gdk_cairo_create(GDK_DRAWABLE(window));
  41     GtkStyle *style = gtk_widget_get_style(widget);
  42
  43     int ox = 4;
  44     int oy = 3;
  45     int sx = widget->allocation.width - ox * 2;
  46     int sy = widget->allocation.height - oy * 2;
  47     int xc = widget->allocation.width / 2;
  48     int yc = widget->allocation.height / 2;
  49     int pad;
  50
  51     if( self->cache_surface == NULL ) {
  52         // looks like its either first call or the widget has been resized.
  53         // create the cache_surface.
  54         cairo_surface_t *window_surface = cairo_get_target( c );
  55         self->cache_surface = cairo_surface_create_similar( window_surface,
  56                                   CAIRO_CONTENT_COLOR,
  57                                   widget->allocation.width,
  58                                   widget->allocation.height );
  59         cairo_t *cache_cr = cairo_create( self->cache_surface );
  60
  61 //        if(widget->style->bg_pixmap[0] == NULL) {
  62             gdk_cairo_set_source_color(cache_cr,&style->bg[GTK_STATE_NORMAL]);
  63 //        } else {
  64 //            gdk_cairo_set_source_pixbuf(cache_cr, GDK_PIXBUF(&style->bg_pixmap[0]), widget->allocation.x, widget->allocation.y + 20);
  65 //        }
  66         cairo_paint(cache_cr);
  67
  68         // outer (black)
  69         pad = 0;
  70         cairo_rectangle(cache_cr, pad, pad, sx + ox * 2 - pad * 2, sy + oy * 2 - pad * 2);
  71         cairo_set_source_rgb(cache_cr, 0, 0, 0);
  72         cairo_fill(cache_cr);
  73
  74         // inner (bevel)
  75         pad = 1;
  76         cairo_rectangle(cache_cr, pad, pad, sx + ox * 2 - pad * 2, sy + oy * 2 - pad * 2);
  77         cairo_pattern_t *pat2 = cairo_pattern_create_linear (0, 0, 0, sy + oy * 2 - pad * 2);
  78         cairo_pattern_add_color_stop_rgba (pat2, 0, 0.23, 0.23, 0.23, 1);
  79         cairo_pattern_add_color_stop_rgba (pat2, 0.5, 0, 0, 0, 1);
  80         cairo_set_source (cache_cr, pat2);
  81         cairo_fill(cache_cr);
  82
  83         cairo_rectangle(cache_cr, ox, oy, sx, sy);
  84         cairo_set_source_rgb (cache_cr, 0, 0, 0);
  85         cairo_fill(cache_cr);
  86
  87         cairo_destroy( cache_cr );
  88     }
  89
  90     cairo_set_source_surface( c, self->cache_surface, 0,0 );
  91     cairo_paint( c );
  92
  93
  94     cairo_pattern_t *pt = cairo_pattern_create_radial(xc, yc, 0, xc, yc, xc > yc ? xc : yc);
  95
  96     float value = self->led_value;
  97
  98     if(self->led_mode >= 4 && self->led_mode <= 5 && value > 1.f) {
  99         value = 1.f;
 100     }
 101     switch (self->led_mode) {
 102         default:
 103         case 0:
 104             // blue-on/off
 105             cairo_pattern_add_color_stop_rgb(pt, 0.0, value > 0.f ? 0.2 : 0.0, value > 0.f ? 1.0 : 0.25, value > 0.f ? 1.0 : 0.35);
 106             cairo_pattern_add_color_stop_rgb(pt, 0.5, value > 0.f ? 0.1 : 0.0, value > 0.f ? 0.6 : 0.15, value > 0.f ? 0.75 : 0.2);
 107             cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,                     value > 0.f ? 0.3 : 0.1,  value > 0.f ? 0.5 : 0.1);
 108             break;
 109         case 1:
 110             // red-on/off
 111             cairo_pattern_add_color_stop_rgb(pt, 0.0, value > 0.f ? 1.0 : 0.35, value > 0.f ? 0.5 : 0.0, value > 0.f ? 0.2 : 0.0);
 112             cairo_pattern_add_color_stop_rgb(pt, 0.5, value > 0.f ? 0.80 : 0.2, value > 0.f ? 0.2 : 0.0, value > 0.f ? 0.1 : 0.0);
 113             cairo_pattern_add_color_stop_rgb(pt, 1.0, value > 0.f ? 0.65 : 0.1, value > 0.f ? 0.1 : 0.0, 0.0);
 114             break;
 115         case 2:
 116         case 4:
 117             // blue-dynamic (limited)
 118             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 119             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 120             cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 121             break;
 122         case 3:
 123         case 5:
 124             // red-dynamic (limited)
 125             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.65 + 0.35, value * 0.5, value * 0.2);
 126             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.6 + 0.2,   value * 0.2, value * 0.1);
 127             cairo_pattern_add_color_stop_rgb(pt, 1.0, value * 0.66 + 0.1,  value * 0.1, 0.0);
 128             break;
 129         case 6:
 130             // blue-dynamic with red peak at >= 1.f
 131             if(value < 1.0) {
 132                 cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 133                 cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 134                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 135             } else {
 136                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 137                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 138                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 139             }
 140             break;
 141         case 7:
 142             // off @ 0.0, blue < 1.0, red @ 1.0
 143             if(value < 1.f and value > 0.f) {
 144                 // blue
 145                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.2, 1.0, 1.0);
 146                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.1, 0.6, 0.75);
 147                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.3, 0.5);
 148             } else if(value == 0.f) {
 149                 // off
 150                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.0, 0.25, 0.35);
 151                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.0, 0.15, 0.2);
 152                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.1,  0.1);
 153             } else {
 154                 // red
 155                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 156                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 157                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 158             }
 159             break;
 160     }
 161
 162     cairo_rectangle(c, ox + 1, oy + 1, sx - 2, sy - 2);
 163     cairo_set_source (c, pt);
 164     cairo_fill_preserve(c);
 165     pt = cairo_pattern_create_linear (ox, oy, ox, ox + sy);
 166     cairo_pattern_add_color_stop_rgba (pt, 0,     1, 1, 1, 0.4);
 167     cairo_pattern_add_color_stop_rgba (pt, 0.4,   1, 1, 1, 0.1);
 168     cairo_pattern_add_color_stop_rgba (pt, 0.401, 0, 0, 0, 0.0);
 169     cairo_pattern_add_color_stop_rgba (pt, 1,     0, 0, 0, 0.2);
 170     cairo_set_source (c, pt);
 171     cairo_fill(c);
 172     cairo_pattern_destroy(pt);
 173
 174     cairo_destroy(c);
 175
 176     return TRUE;
 177 }
 178
 179 static void
 180 calf_led_realize(GtkWidget *widget)
 181 {
 182     GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
 183
 184     GdkWindowAttr attributes;
 185     attributes.event_mask = GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
 186     attributes.x = widget->allocation.x;
 187     attributes.y = widget->allocation.y;
 188     attributes.width = widget->allocation.width;
 189     attributes.height = widget->allocation.height;
 190     attributes.wclass = GDK_INPUT_OUTPUT;
 191     attributes.window_type = GDK_WINDOW_CHILD;
 192
 193     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget), &attributes, GDK_WA_X | GDK_WA_Y);
 194
 195     gdk_window_set_user_data(widget->window, widget);
 196     widget->style = gtk_style_attach(widget->style, widget->window);
 197 }
 198
 199 static void
 200 calf_led_size_request (GtkWidget *widget,
 201                            GtkRequisition *requisition)
 202 {
 203     g_assert(CALF_IS_LED(widget));
 204     CalfLed *self = CALF_LED(widget);
 205     requisition->width = self->size ? 24 : 19;
 206     requisition->height = self->size ? 18 : 14;
 207 }
 208
 209 static void
 210 calf_led_size_allocate (GtkWidget *widget,
 211                            GtkAllocation *allocation)
 212 {
 213     g_assert(CALF_IS_LED(widget));
 214     CalfLed *led = CALF_LED(widget);
 215
 216     widget->allocation = *allocation;
 217
 218     if( led->cache_surface )
 219         cairo_surface_destroy( led->cache_surface );
 220     led->cache_surface = NULL;
 221
 222     if (GTK_WIDGET_REALIZED(widget))
 223         gdk_window_move_resize(widget->window, allocation->x, allocation->y, allocation->width, allocation->height );
 224 }
 225
 226 static gboolean
 227 calf_led_button_press (GtkWidget *widget, GdkEventButton *event)
 228 {
 229     return TRUE;
 230 }
 231
 232 static void
 233 calf_led_class_init (CalfLedClass *klass)
 234 {
 235     GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 236     widget_class->realize = calf_led_realize;
 237     widget_class->expose_event = calf_led_expose;
 238     widget_class->size_request = calf_led_size_request;
 239     widget_class->size_allocate = calf_led_size_allocate;
 240     widget_class->button_press_event = calf_led_button_press;
 241 }
 242
 243 static void
 244 calf_led_init (CalfLed *self)
 245 {
 246     GtkWidget *widget = GTK_WIDGET(self);
 247     // GtkWidget *widget = GTK_WIDGET(self);
 248     // GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
 249     self->led_value = 0.f;
 250     self->cache_surface = NULL;
 251     widget->requisition.width = self->size ? 24 : 19;
 252     widget->requisition.height = self->size ? 18 : 14;
 253 }
 254
 255 void calf_led_set_value(CalfLed *led, float value)
 256 {
 257     if (value != led->led_value)
 258     {
 259         float old_value = led->led_value;
 260         led->led_value = value;
 261         if (led->led_mode >= 2 || (old_value > 0) != (value > 0))
 262         {
 263             GtkWidget *widget = GTK_WIDGET (led);
 264             if (GTK_WIDGET_REALIZED(widget))
 265                 gtk_widget_queue_draw (widget);
 266         }
 267     }
 268 }
 269
 270 gboolean calf_led_get_value(CalfLed *led)
 271 {
 272     return led->led_value;
 273 }
 274
 275 GType
 276 calf_led_get_type (void)
 277 {
 278     static GType type = 0;
 279     if (!type) {
 280         static const GTypeInfo type_info = {
 281             sizeof(CalfLedClass),
 282             NULL, /* base_init */
 283             NULL, /* base_finalize */
 284             (GClassInitFunc)calf_led_class_init,
 285             NULL, /* class_finalize */
 286             NULL, /* class_data */
 287             sizeof(CalfLed),
 288             0,    /* n_preallocs */
 289             (GInstanceInitFunc)calf_led_init
 290         };
 291
 292         for (int i = 0; ; i++) {
 293             char *name = g_strdup_printf("CalfLed%u%d",
 294                 ((unsigned int)(intptr_t)calf_led_class_init) >> 16, i);
 295             if (g_type_from_name(name)) {
 296                 free(name);
 297                 continue;
 298             }
 299             type = g_type_register_static(GTK_TYPE_WIDGET,
 300                                           name,
 301                                           &type_info,
 302                                           (GTypeFlags)0);
 303             free(name);
 304             break;
 305         }
 306     }
 307     return type;
 308 }