+#include "lrameter.h"
+
#include <QPainter>
+#include <QPalette>
+#include <QPen>
+#include "vu_common.h"
-#include "lrameter.h"
+class QPaintEvent;
using namespace std;
-namespace {
-
-int lufs_to_pos(float level_lu, int height)
+LRAMeter::LRAMeter(QWidget *parent)
+ : QWidget(parent)
{
- const float min_level = 9.0f; // y=0 is top of screen, so “min” is the loudest level.
- const float max_level = -18.0f;
- 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;
}
-} // namespace
-
-LRAMeter::LRAMeter(QWidget *parent)
- : QWidget(parent)
+void LRAMeter::resizeEvent(QResizeEvent *event)
{
+ recalculate_pixmaps();
}
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());
+ float level_lu = level_lufs - ref_level_lufs;
+ float range_low_lu = range_low_lufs - ref_level_lufs;
+ float range_high_lu = range_high_lufs - ref_level_lufs;
+ int range_low_pos = lrint(lufs_to_pos(range_low_lu, height()));
+ int range_high_pos = lrint(lufs_to_pos(range_high_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;
+ QRect top_off_rect(0, 0, width(), range_high_pos);
+ QRect on_rect(0, range_high_pos, width(), range_low_pos - range_high_pos);
+ QRect bottom_off_rect(0, range_low_pos, width(), height() - range_low_pos);
- 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);
- }
- }
+ painter.drawPixmap(top_off_rect, off_pixmap, top_off_rect);
+ painter.drawPixmap(on_rect, on_pixmap, on_rect);
+ painter.drawPixmap(bottom_off_rect, off_pixmap, bottom_off_rect);
// Draw the target area (+/-1 LU is allowed EBU range).
- int min_y = lufs_to_pos(1.0f, height());
- int max_y = lufs_to_pos(-1.0f, height());
+ // It turns green when we're within.
+ int min_y = lrint(lufs_to_pos(1.0f, height()));
+ int max_y = lrint(lufs_to_pos(-1.0f, height()));
// FIXME: This outlining isn't so pretty.
{
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 = lrint(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);
+ }
+}
+
+void LRAMeter::recalculate_pixmaps()
+{
+ const int margin = 5;
+
+ on_pixmap = QPixmap(width(), height());
+ QPainter on_painter(&on_pixmap);
+ on_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
+ draw_vu_meter(on_painter, width(), height(), margin, 2.0, true, min_level, max_level, /*flip=*/false);
+
+ off_pixmap = QPixmap(width(), height());
+ QPainter off_painter(&off_pixmap);
+ off_painter.fillRect(0, 0, width(), height(), parentWidget()->palette().window());
+ draw_vu_meter(off_painter, width(), height(), margin, 2.0, false, min_level, max_level, /*flip=*/false);
}