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 #include <calf/drawingutils.h>
  26
  27 GtkWidget *
  28 calf_led_new()
  29 {
  30     GtkWidget *widget = GTK_WIDGET( g_object_new (CALF_TYPE_LED, NULL ));
  31     return widget;
  32 }
  33
  34 static gboolean
  35 calf_led_expose (GtkWidget *widget, GdkEventExpose *event)
  36 {
  37     g_assert(CALF_IS_LED(widget));
  38
  39     CalfLed *self = CALF_LED(widget);
  40     GdkWindow *window = widget->window;
  41     cairo_t *c = gdk_cairo_create(GDK_DRAWABLE(window));
  42     GtkStyle *style = gtk_widget_get_style(widget);
  43
  44     int ox = 4;
  45     int oy = 3;
  46     int sx = widget->allocation.width - ox * 2;
  47     int sy = widget->allocation.height - oy * 2;
  48     int xc = widget->allocation.width / 2;
  49     int yc = widget->allocation.height / 2;
  50     int pad;
  51
  52     if( self->cache_surface == NULL ) {
  53         // looks like its either first call or the widget has been resized.
  54         // create the cache_surface.
  55         cairo_surface_t *window_surface = cairo_get_target( c );
  56         self->cache_surface = cairo_surface_create_similar( window_surface,
  57                                   CAIRO_CONTENT_COLOR,
  58                                   widget->allocation.width,
  59                                   widget->allocation.height );
  60         cairo_t *cache_cr = cairo_create( self->cache_surface );
  61
  62 //        if(widget->style->bg_pixmap[0] == NULL) {
  63             gdk_cairo_set_source_color(cache_cr,&style->bg[GTK_STATE_NORMAL]);
  64 //        } else {
  65 //            gdk_cairo_set_source_pixbuf(cache_cr, GDK_PIXBUF(&style->bg_pixmap[0]), widget->allocation.x, widget->allocation.y + 20);
  66 //        }
  67         cairo_paint(cache_cr);
  68
  69         // outer (black)
  70         pad = 0;
  71         cairo_rectangle(cache_cr, pad, pad, sx + ox * 2 - pad * 2, sy + oy * 2 - pad * 2);
  72         cairo_set_source_rgb(cache_cr, 0, 0, 0);
  73         cairo_set_operator(cache_cr,CAIRO_OPERATOR_CLEAR);
  74         cairo_fill(cache_cr);
  75         cairo_set_operator(cache_cr,CAIRO_OPERATOR_OVER);
  76
  77         // inner (bevel)
  78         pad = 0;
  79         create_rectangle(cache_cr, pad, pad, sx + ox * 2 - pad * 2, sy + oy * 2 - pad * 2, 0);
  80         cairo_pattern_t *pat2 = cairo_pattern_create_linear (0, 0, 0, sy + oy * 2 - pad * 2);
  81         float r, g, b;
  82         get_bg_color(widget, NULL, &r, &g, &b);
  83         cairo_pattern_add_color_stop_rgba (pat2, 0, r*1.111, g*1.111, b*1.111, 1);
  84         cairo_pattern_add_color_stop_rgba (pat2, 1, r*0.82, g*0.82, b*0.82, 1);
  85         cairo_set_source (cache_cr, pat2);
  86         cairo_fill(cache_cr);
  87
  88         cairo_rectangle(cache_cr, ox, oy, sx, sy);
  89         cairo_set_source_rgb (cache_cr, 0, 0, 0);
  90         cairo_fill(cache_cr);
  91
  92         cairo_destroy( cache_cr );
  93     }
  94
  95     cairo_set_source_surface( c, self->cache_surface, 0,0 );
  96     cairo_paint( c );
  97
  98
  99     cairo_pattern_t *pt = cairo_pattern_create_radial(xc, yc, 0, xc, yc, xc > yc ? xc : yc);
 100
 101     float value = self->led_value;
 102
 103     if(self->led_mode >= 4 && self->led_mode <= 5 && value > 1.f) {
 104         value = 1.f;
 105     }
 106     switch (self->led_mode) {
 107         default:
 108         case 0:
 109             // blue-on/off
 110             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);
 111             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);
 112             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);
 113             break;
 114         case 1:
 115             // red-on/off
 116             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);
 117             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);
 118             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);
 119             break;
 120         case 2:
 121         case 4:
 122             // blue-dynamic (limited)
 123             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 124             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 125             cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 126             break;
 127         case 3:
 128         case 5:
 129             // red-dynamic (limited)
 130             cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.65 + 0.35, value * 0.5, value * 0.2);
 131             cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.6 + 0.2,   value * 0.2, value * 0.1);
 132             cairo_pattern_add_color_stop_rgb(pt, 1.0, value * 0.66 + 0.1,  value * 0.1, 0.0);
 133             break;
 134         case 6:
 135             // blue-dynamic with red peak at >= 1.f
 136             if(value < 1.0) {
 137                 cairo_pattern_add_color_stop_rgb(pt, 0.0, value * 0.2, value * 0.75 + 0.25, value * 0.65 + 0.35);
 138                 cairo_pattern_add_color_stop_rgb(pt, 0.5, value * 0.1, value * 0.45 + 0.15, value * 0.55 + 0.2);
 139                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0,         value * 0.2 + 0.1,   value * 0.4 + 0.1);
 140             } else {
 141                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 142                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 143                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 144             }
 145             break;
 146         case 7:
 147             // off @ 0.0, blue < 1.0, red @ 1.0
 148             if(value < 1.f and value > 0.f) {
 149                 // blue
 150                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.2, 1.0, 1.0);
 151                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.1, 0.6, 0.75);
 152                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.3, 0.5);
 153             } else if(value == 0.f) {
 154                 // off
 155                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 0.0, 0.25, 0.35);
 156                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.0, 0.15, 0.2);
 157                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.0, 0.1,  0.1);
 158             } else {
 159                 // red
 160                 cairo_pattern_add_color_stop_rgb(pt, 0.0, 1.0,  0.5, 0.2);
 161                 cairo_pattern_add_color_stop_rgb(pt, 0.5, 0.80, 0.2, 0.1);
 162                 cairo_pattern_add_color_stop_rgb(pt, 1.0, 0.66, 0.1, 0.0);
 163             }
 164             break;
 165     }
 166
 167     cairo_rectangle(c, ox + 1, oy + 1, sx - 2, sy - 2);
 168     cairo_set_source (c, pt);
 169     cairo_fill_preserve(c);
 170     pt = cairo_pattern_create_linear (ox, oy, ox, ox + sy);
 171     cairo_pattern_add_color_stop_rgba (pt, 0,     1, 1, 1, 0.4);
 172     cairo_pattern_add_color_stop_rgba (pt, 0.4,   1, 1, 1, 0.1);
 173     cairo_pattern_add_color_stop_rgba (pt, 0.401, 0, 0, 0, 0.0);
 174     cairo_pattern_add_color_stop_rgba (pt, 1,     0, 0, 0, 0.2);
 175     cairo_set_source (c, pt);
 176     cairo_fill(c);
 177     cairo_pattern_destroy(pt);
 178
 179     cairo_destroy(c);
 180
 181     return TRUE;
 182 }
 183
 184 static void
 185 calf_led_realize(GtkWidget *widget)
 186 {
 187     GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
 188
 189     GdkWindowAttr attributes;
 190     attributes.event_mask = GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
 191     attributes.x = widget->allocation.x;
 192     attributes.y = widget->allocation.y;
 193     attributes.width = widget->allocation.width;
 194     attributes.height = widget->allocation.height;
 195     attributes.wclass = GDK_INPUT_OUTPUT;
 196     attributes.window_type = GDK_WINDOW_CHILD;
 197
 198     widget->window = gdk_window_new(gtk_widget_get_parent_window (widget), &attributes, GDK_WA_X | GDK_WA_Y);
 199
 200     gdk_window_set_user_data(widget->window, widget);
 201     widget->style = gtk_style_attach(widget->style, widget->window);
 202 }
 203
 204 static void
 205 calf_led_size_request (GtkWidget *widget,
 206                            GtkRequisition *requisition)
 207 {
 208     g_assert(CALF_IS_LED(widget));
 209     CalfLed *self = CALF_LED(widget);
 210     requisition->width = self->size ? 24 : 19;
 211     requisition->height = self->size ? 18 : 14;
 212 }
 213
 214 static void
 215 calf_led_size_allocate (GtkWidget *widget,
 216                            GtkAllocation *allocation)
 217 {
 218     g_assert(CALF_IS_LED(widget));
 219     CalfLed *led = CALF_LED(widget);
 220
 221     widget->allocation = *allocation;
 222
 223     if( led->cache_surface )
 224         cairo_surface_destroy( led->cache_surface );
 225     led->cache_surface = NULL;
 226
 227     if (GTK_WIDGET_REALIZED(widget))
 228         gdk_window_move_resize(widget->window, allocation->x, allocation->y, allocation->width, allocation->height );
 229 }
 230
 231 static gboolean
 232 calf_led_button_press (GtkWidget *widget, GdkEventButton *event)
 233 {
 234     return TRUE;
 235 }
 236
 237 static void
 238 calf_led_class_init (CalfLedClass *klass)
 239 {
 240     GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
 241     widget_class->realize = calf_led_realize;
 242     widget_class->expose_event = calf_led_expose;
 243     widget_class->size_request = calf_led_size_request;
 244     widget_class->size_allocate = calf_led_size_allocate;
 245     widget_class->button_press_event = calf_led_button_press;
 246 }
 247
 248 static void
 249 calf_led_init (CalfLed *self)
 250 {
 251     GtkWidget *widget = GTK_WIDGET(self);
 252     // GtkWidget *widget = GTK_WIDGET(self);
 253     // GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_FOCUS);
 254     self->led_value = 0.f;
 255     self->cache_surface = NULL;
 256     widget->requisition.width = self->size ? 24 : 19;
 257     widget->requisition.height = self->size ? 18 : 14;
 258 }
 259
 260 void calf_led_set_value(CalfLed *led, float value)
 261 {
 262     if (value != led->led_value)
 263     {
 264         float old_value = led->led_value;
 265         led->led_value = value;
 266         if (led->led_mode >= 2 || (old_value > 0) != (value > 0))
 267         {
 268             GtkWidget *widget = GTK_WIDGET (led);
 269             if (GTK_WIDGET_REALIZED(widget))
 270                 gtk_widget_queue_draw (widget);
 271         }
 272     }
 273 }
 274
 275 gboolean calf_led_get_value(CalfLed *led)
 276 {
 277     return led->led_value;
 278 }
 279
 280 GType
 281 calf_led_get_type (void)
 282 {
 283     static GType type = 0;
 284     if (!type) {
 285         static const GTypeInfo type_info = {
 286             sizeof(CalfLedClass),
 287             NULL, /* base_init */
 288             NULL, /* base_finalize */
 289             (GClassInitFunc)calf_led_class_init,
 290             NULL, /* class_finalize */
 291             NULL, /* class_data */
 292             sizeof(CalfLed),
 293             0,    /* n_preallocs */
 294             (GInstanceInitFunc)calf_led_init
 295         };
 296
 297         for (int i = 0; ; i++) {
 298             char *name = g_strdup_printf("CalfLed%u%d",
 299                 ((unsigned int)(intptr_t)calf_led_class_init) >> 16, i);
 300             if (g_type_from_name(name)) {
 301                 free(name);
 302                 continue;
 303             }
 304             type = g_type_register_static(GTK_TYPE_WIDGET,
 305                                           name,
 306                                           &type_info,
 307                                           (GTypeFlags)0);
 308             free(name);
 309             break;
 310         }
 311     }
 312     return type;
 313 }