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Piano: Cache buffers in Track and WaveWidget
The Track itself caches the Samples after each processing step which allows it to be queried without the need to process it every time. This result is queried by the WaveWidget which then caches the result to prevent unnecessary heap allocations every paint event.
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5 changed files with 51 additions and 9 deletions
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@ -36,20 +36,19 @@ void WaveWidget::paint_event(GUI::PaintEvent& event)
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Color left_wave_color = left_wave_colors[m_track_manager.current_track()->synth()->wave()];
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Color right_wave_color = right_wave_colors[m_track_manager.current_track()->synth()->wave()];
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// FIXME: We can't get the last buffer from the track manager anymore
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auto buffer = FixedArray<Audio::Sample>::must_create_but_fixme_should_propagate_errors(sample_count);
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double width_scale = static_cast<double>(frame_inner_rect().width()) / buffer.size();
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m_track_manager.current_track()->write_cached_signal_to(m_samples.span());
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double width_scale = static_cast<double>(frame_inner_rect().width()) / m_samples.size();
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auto const maximum = Audio::Sample::max_range(buffer.span());
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auto const maximum = Audio::Sample::max_range(m_samples.span());
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int prev_x = 0;
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int prev_y_left = sample_to_y(buffer[0].left, maximum.left);
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int prev_y_right = sample_to_y(buffer[0].right, maximum.right);
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int prev_y_left = sample_to_y(m_samples[0].left, maximum.left);
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int prev_y_right = sample_to_y(m_samples[0].right, maximum.right);
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painter.set_pixel({ prev_x, prev_y_left }, left_wave_color);
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painter.set_pixel({ prev_x, prev_y_right }, right_wave_color);
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for (size_t x = 1; x < buffer.size(); ++x) {
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int y_left = sample_to_y(buffer[x].left, maximum.left);
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int y_right = sample_to_y(buffer[x].right, maximum.right);
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for (size_t x = 1; x < m_samples.size(); ++x) {
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int y_left = sample_to_y(m_samples[x].left, maximum.left);
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int y_right = sample_to_y(m_samples[x].right, maximum.right);
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Gfx::IntPoint point1_left(prev_x * width_scale, prev_y_left);
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Gfx::IntPoint point2_left(x * width_scale, y_left);
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