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

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