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levelmeters.c

/*****************************************************************************
   levelmeters.c - Stereo level meters
   Copyright (C) 2000 by Jaroslav Kysela <perex@suse.cz>
   
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
******************************************************************************/

#include "envy24control.h"

static GdkGC *penGreenShadow[21] = { NULL, };
static GdkGC *penGreenLight[21] = { NULL, };
static GdkGC *penOrangeShadow[21] = { NULL, };
static GdkGC *penOrangeLight[21] = { NULL, };
static GdkGC *penRedShadow[21] = { NULL, };
static GdkGC *penRedLight[21] = { NULL, };
static GdkPixmap *pixmap[21] = { NULL, };
static snd_ctl_elem_value_t *peaks;

extern int input_channels, output_channels, pcm_output_channels, spdif_channels, view_spdif_playback;

static void update_peak_switch(void)
{
      int err;

      if ((err = snd_ctl_elem_read(ctl, peaks)) < 0)
            g_print("Unable to read peaks: %s\n", snd_strerror(err));
}

static void get_levels(int idx, int *l1, int *l2)
{
      *l1 = *l2 = 0;
      
      if (idx == 0) {
            *l1 = snd_ctl_elem_value_get_integer(peaks, 20);
            *l2 = snd_ctl_elem_value_get_integer(peaks, 21);
      } else {
            *l1 = *l2 = snd_ctl_elem_value_get_integer(peaks, idx - 1);
      }
}

static GdkGC *get_pen(int idx, int nRed, int nGreen, int nBlue)
{
      GdkColor *c;
      GdkGC *gc;
      
      c = (GdkColor *)g_malloc(sizeof(GdkColor));
      c->red = nRed;
      c->green = nGreen;
      c->blue = nBlue;
      gdk_color_alloc(gdk_colormap_get_system(), c);
      gc = gdk_gc_new(pixmap[idx]);
      gdk_gc_set_foreground(gc, c);
      return gc;
}

static int get_index(gchar *name)
{
      int result;

      if (!strcmp(name, "DigitalMixer"))
            return 0;
      result = atoi(name + 5);
      if (result < 1 || result > 20) {
            g_print("Wrong drawing area ID: %s\n", name);
            gtk_main_quit();
      }
      return result;
}

static void redraw_meters(int idx, int width, int height, int level1, int level2)
{
      int stereo = idx == 0;
      int segment_width = stereo ? (width / 2) - 8 : width - 12;
      int segments = (height - 6) / 4;
      int green_segments = (segments / 4) * 3;
      int red_segments = 2;
      int orange_segments = segments - green_segments - red_segments;
      int seg;
      int segs_on1 = ((segments * level1) + 128) / 255;
      int segs_on2 = ((segments * level2) + 128) / 255;

      // g_print("segs_on1 = %i (%i), segs_on2 = %i (%i)\n", segs_on1, level1, segs_on2, level2);
      for (seg = 0; seg < green_segments; seg++) {
            gdk_draw_rectangle(pixmap[idx],
                           segs_on1 > 0 ? penGreenLight[idx] : penGreenShadow[idx],
                           TRUE,
                           6, 3 + ((segments - seg - 1) * 4),
                           segment_width,
                           3);
            if (stereo)
                  gdk_draw_rectangle(pixmap[idx],
                                 segs_on2 > 0 ? penGreenLight[idx] : penGreenShadow[idx],
                                 TRUE,
                                 2 + (width / 2),
                                 3 + ((segments - seg - 1) * 4),
                                 segment_width,
                                 3);
            segs_on1--;
            segs_on2--;
      }
      for (seg = green_segments; seg < green_segments + orange_segments; seg++) {
            gdk_draw_rectangle(pixmap[idx],
                           segs_on1 > 0 ? penOrangeLight[idx] : penOrangeShadow[idx],
                           TRUE,
                           6, 3 + ((segments - seg - 1) * 4),
                           segment_width,
                           3);
            if (stereo)
                  gdk_draw_rectangle(pixmap[idx],
                                 segs_on2 > 0 ? penOrangeLight[idx] : penOrangeShadow[idx],
                                 TRUE,
                                 2 + (width / 2),
                                 3 + ((segments - seg - 1) * 4),
                                 segment_width,
                                 3);
            segs_on1--;
            segs_on2--;
      }
      for (seg = green_segments + orange_segments; seg < segments; seg++) {
            gdk_draw_rectangle(pixmap[idx],
                           segs_on1 > 0 ? penRedLight[idx] : penRedShadow[idx],
                           TRUE,
                           6, 3 + ((segments - seg - 1) * 4),
                           segment_width,
                           3);
            if (stereo)
                  gdk_draw_rectangle(pixmap[idx],
                                 segs_on2 > 0 ? penRedLight[idx] : penRedShadow[idx],
                                 TRUE,
                                 2 + (width / 2),
                                 3 + ((segments - seg - 1) * 4),
                                 segment_width,
                                 3);
            segs_on1--;
            segs_on2--;
      }
}

gint level_meters_configure_event(GtkWidget *widget, GdkEventConfigure *event)
{
      int idx = get_index(gtk_widget_get_name(widget));

      if (pixmap[idx] != NULL)
            gdk_pixmap_unref(pixmap[idx]);
      pixmap[idx] = gdk_pixmap_new(widget->window,
                             widget->allocation.width,
                             widget->allocation.height,
                             -1);
      penGreenShadow[idx] = get_pen(idx, 0, 0x77ff, 0);
      penGreenLight[idx] = get_pen(idx, 0, 0xffff, 0);
      penOrangeShadow[idx] = get_pen(idx, 0xddff, 0x55ff, 0);
      penOrangeLight[idx] = get_pen(idx, 0xffff, 0x99ff, 0);
      penRedShadow[idx] = get_pen(idx, 0xaaff, 0, 0);
      penRedLight[idx] = get_pen(idx, 0xffff, 0, 0);
      gdk_draw_rectangle(pixmap[idx],
                     widget->style->black_gc,
                     TRUE,
                     0, 0,
                     widget->allocation.width,
                     widget->allocation.height);
      // g_print("configure: %i:%i\n", widget->allocation.width, widget->allocation.height);
      redraw_meters(idx, widget->allocation.width, widget->allocation.height, 0, 0);
      return TRUE;
}

gint level_meters_expose_event(GtkWidget *widget, GdkEventExpose *event)
{
      int idx = get_index(gtk_widget_get_name(widget));
      int l1, l2;
      
      get_levels(idx, &l1, &l2);
      redraw_meters(idx, widget->allocation.width, widget->allocation.height, l1, l2);
      gdk_draw_pixmap(widget->window,
                  widget->style->black_gc,
                  pixmap[idx],
                  event->area.x, event->area.y,
                  event->area.x, event->area.y,
                  event->area.width, event->area.height);
      return FALSE;
}

gint level_meters_timeout_callback(gpointer data)
{
      GtkWidget *widget;
      int idx, l1, l2;

      update_peak_switch();
      for (idx = 0; idx <= pcm_output_channels; idx++) {
            get_levels(idx, &l1, &l2);
            widget = idx == 0 ? mixer_mix_drawing : mixer_drawing[idx-1];
            if (!GTK_WIDGET_VISIBLE(widget))
                  continue;
            redraw_meters(idx, widget->allocation.width, widget->allocation.height, l1, l2);
            gdk_draw_pixmap(widget->window,
                        widget->style->black_gc,
                        pixmap[idx],
                        0, 0,
                        0, 0,
                        widget->allocation.width, widget->allocation.height); 
      }
      if (view_spdif_playback) {
            for (idx = MAX_PCM_OUTPUT_CHANNELS + 1; idx <= MAX_OUTPUT_CHANNELS + spdif_channels; idx++) {
                  get_levels(idx, &l1, &l2);
                  widget = idx == 0 ? mixer_mix_drawing : mixer_drawing[idx-1];
                  if (!GTK_WIDGET_VISIBLE(widget))
                        continue;
                  redraw_meters(idx, widget->allocation.width, widget->allocation.height, l1, l2);
                  gdk_draw_pixmap(widget->window,
                              widget->style->black_gc,
                              pixmap[idx],
                              0, 0,
                              0, 0,
                              widget->allocation.width, widget->allocation.height); 
            }
      }
      for (idx = MAX_PCM_OUTPUT_CHANNELS + MAX_SPDIF_CHANNELS + 1; idx <= input_channels + MAX_PCM_OUTPUT_CHANNELS + MAX_SPDIF_CHANNELS; idx++) {
            get_levels(idx, &l1, &l2);
            widget = idx == 0 ? mixer_mix_drawing : mixer_drawing[idx-1];
            if (!GTK_WIDGET_VISIBLE(widget))
                  continue;
            redraw_meters(idx, widget->allocation.width, widget->allocation.height, l1, l2);
            gdk_draw_pixmap(widget->window,
                        widget->style->black_gc,
                        pixmap[idx],
                        0, 0,
                        0, 0,
                        widget->allocation.width, widget->allocation.height); 
      }
      for (idx = MAX_PCM_OUTPUT_CHANNELS + MAX_SPDIF_CHANNELS + MAX_INPUT_CHANNELS + 1; \
                idx <= spdif_channels + MAX_PCM_OUTPUT_CHANNELS + MAX_SPDIF_CHANNELS + MAX_INPUT_CHANNELS; idx++) {
            get_levels(idx, &l1, &l2);
            widget = idx == 0 ? mixer_mix_drawing : mixer_drawing[idx-1];
            if (!GTK_WIDGET_VISIBLE(widget))
                  continue;
            redraw_meters(idx, widget->allocation.width, widget->allocation.height, l1, l2);
            gdk_draw_pixmap(widget->window,
                        widget->style->black_gc,
                        pixmap[idx],
                        0, 0,
                        0, 0,
                        widget->allocation.width, widget->allocation.height); 
      }
      return TRUE;
}

void level_meters_reset_peaks(GtkButton *button, gpointer data)
{
}

void level_meters_init(void)
{
      snd_ctl_elem_value_malloc(&peaks);
      snd_ctl_elem_value_set_interface(peaks, SND_CTL_ELEM_IFACE_MIXER);
      snd_ctl_elem_value_set_name(peaks, "Multi Track Peak");
}

void level_meters_postinit(void)
{
      level_meters_timeout_callback(NULL);
}

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