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

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