git.sesse.net Git - nageru/blob - nageru/vumeter.cpp

   1 #include "vumeter.h"
   2
   3 #include <QPaintDevice>
   4 #include <QPainter>
   5 #include <QPixmap>
   6 #include <QRect>
   7 #include <QWidget>
   8 #include <math.h>
   9 #include <mutex>
  10 #include "vu_common.h"
  11
  12 class QPaintEvent;
  13 class QResizeEvent;
  14
  15 using namespace std;
  16
  17 VUMeter::VUMeter(QWidget *parent)
  18         : QWidget(parent)
  19 {
  20 }
  21
  22 void VUMeter::resizeEvent(QResizeEvent *event)
  23 {
  24         recalculate_pixmaps();
  25 }
  26
  27 void VUMeter::paintEvent(QPaintEvent *event)
  28 {
  29         QPainter painter(this);
  30
  31         float level_lufs[2], peak_lufs[2];
  32         {
  33                 lock_guard<mutex> lock(level_mutex);
  34                 level_lufs[0] = this->level_lufs[0];
  35                 level_lufs[1] = this->level_lufs[1];
  36                 peak_lufs[0] = this->peak_lufs[0];
  37                 peak_lufs[1] = this->peak_lufs[1];
  38         }
  39
  40         int mid = width() / 2;
  41
  42         for (unsigned channel = 0; channel < 2; ++channel) {
  43                 int left = (channel == 0) ? 0 : mid;
  44                 int right = (channel == 0) ? mid : width();
  45                 float level_lu = level_lufs[channel] - ref_level_lufs;
  46                 int on_pos = lrint(lufs_to_pos(level_lu, height()));
  47
  48                 QRect off_rect(left, 0, right - left, on_pos);
  49                 QRect on_rect(left, on_pos, right - left, height() - on_pos);
  50
  51                 painter.drawPixmap(off_rect, off_pixmap, off_rect);
  52                 painter.drawPixmap(on_rect, on_pixmap, on_rect);
  53
  54                 float peak_lu = peak_lufs[channel] - ref_level_lufs;
  55                 if (peak_lu >= min_level && peak_lu <= max_level) {
  56                         int peak_pos = lrint(lufs_to_pos(peak_lu, height()));
  57                         QRect peak_rect(left, peak_pos - 1, right, 2);
  58                         painter.drawPixmap(peak_rect, full_on_pixmap, peak_rect);
  59                 }
  60         }
  61 }
  62
  63 void VUMeter::recalculate_pixmaps()
  64 {
  65         full_on_pixmap = QPixmap(width(), height());
  66         QPainter full_on_painter(&full_on_pixmap);
  67         full_on_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
  68         draw_vu_meter(full_on_painter, width(), height(), 0, 0.0, true, min_level, max_level, /*flip=*/false);
  69
  70         float margin = 0.5 * (width() - 20);
  71
  72         on_pixmap = QPixmap(width(), height());
  73         QPainter on_painter(&on_pixmap);
  74         on_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
  75         draw_vu_meter(on_painter, width(), height(), margin, 2.0, true, min_level, max_level, /*flip=*/false);
  76
  77         off_pixmap = QPixmap(width(), height());
  78         QPainter off_painter(&off_pixmap);
  79         off_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
  80         draw_vu_meter(off_painter, width(), height(), margin, 2.0, false, min_level, max_level, /*flip=*/false);
  81 }