-#include <QPainter>
-
#include "lrameter.h"
-using namespace std;
-
-namespace {
-
-int lufs_to_pos(float level_lu, int height)
-{
- const float min_level = 9.0f; // y=0 is top of screen, so “min” is the loudest level.
- const float max_level = -18.0f;
-
- // Handle -inf.
- if (level_lu < max_level) {
- return height - 1;
- }
+#include <QPainter>
+#include <QPalette>
+#include <QPen>
+#include "vu_common.h"
- int y = lrintf(height * (level_lu - min_level) / (max_level - min_level));
- y = std::max(y, 0);
- y = std::min(y, height - 1);
- return y;
-}
+class QPaintEvent;
-} // namespace
+using namespace std;
LRAMeter::LRAMeter(QWidget *parent)
: QWidget(parent)
void LRAMeter::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
- const int margin = 5;
painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
- painter.fillRect(margin, 0, width() - 2 * margin, height(), Qt::black);
-
- // TODO: QLinearGradient is not gamma-correct; we might want to correct for that.
- QLinearGradient on(0, 0, 0, height());
- on.setColorAt(0.0f, QColor(255, 0, 0));
- on.setColorAt(0.5f, QColor(255, 255, 0));
- on.setColorAt(1.0f, QColor(0, 255, 0));
- QColor off(80, 80, 80);
float level_lufs;
+ float range_low_lufs;
+ float range_high_lufs;
{
unique_lock<mutex> lock(level_mutex);
level_lufs = this->level_lufs;
+ range_low_lufs = this->range_low_lufs;
+ range_high_lufs = this->range_high_lufs;
}
float level_lu = level_lufs + 23.0f;
- int y = lufs_to_pos(level_lu, height());
-
- // Draw bars colored up until the level, then gray from there.
- for (int level = -18; level < 9; ++level) {
- int min_y = lufs_to_pos(level + 1.0f, height()) + 1;
- int max_y = lufs_to_pos(level, height()) - 1;
-
- if (y > max_y) {
- painter.fillRect(margin, min_y, width() - 2 * margin, max_y - min_y, off);
- } else if (y < min_y) {
- painter.fillRect(margin, min_y, width() - 2 * margin, max_y - min_y, on);
- } else {
- painter.fillRect(margin, min_y, width() - 2 * margin, y - min_y, off);
- painter.fillRect(margin, y, width() - 2 * margin, max_y - y, on);
- }
- }
+ float range_low_lu = range_low_lufs + 23.0f;
+ float range_high_lu = range_high_lufs + 23.0f;
+ const int margin = 5;
+ draw_vu_meter(painter, range_low_lu, range_high_lu, width(), height(), margin);
// Draw the target area (+/-1 LU is allowed EBU range).
+ // It turns green when we're within.
int min_y = lufs_to_pos(1.0f, height());
int max_y = lufs_to_pos(-1.0f, height());
painter.setPen(pen);
painter.drawRect(2, min_y, width() - 5, max_y - min_y);
}
+
+ // Draw the integrated loudness meter, in the same color as the target area.
+ int y = lufs_to_pos(level_lu, height());
+ {
+ QPen pen(Qt::black);
+ pen.setWidth(5);
+ painter.setPen(pen);
+ painter.drawRect(2, y, width() - 5, 1);
+ }
+ {
+ QPen pen;
+ if (level_lu >= -1.0f && level_lu <= 1.0f) {
+ pen.setColor(Qt::green);
+ } else {
+ pen.setColor(Qt::red);
+ }
+ pen.setWidth(3);
+ painter.setPen(pen);
+ painter.drawRect(2, y, width() - 5, 1);
+ }
}